MA Well Driller cheat sheet

Massachusetts setback minimums (310 CMR 15.000/Well Regulations): private well 50 ft from septic tank, 100 ft from leaching field or tight tank; 25 ft from property line unless written waiver from abutter; 10 ft from building foundation and from public/private utility lines.

Bedrock well siting rule: locate on competent rock, avoid fault/shear zones and contacts between contrasting rock types where fracture permeability is unpredictable; a well in a fracture zone can draw surface water within hours.

Overburden yield depends on grain size and sorting: gravel/sand yield high, till yields low but reliable, clay and silt yield little; specific capacity (gpm per ft of drawdown) is the practical ranking test.

Static water level is measured before pumping; pumping water level is measured after drawdown stabilizes; drawdown = static level minus pumping level, and specific capacity = pumping rate divided by drawdown.

Confined aquifers respond to pumping with a potentiometric surface decline, not dewatering; an artesian well may flow at land surface, requiring a packer or controlled flow to prevent uncontrolled discharge.

Contaminant pathway siting rule: never site a well down-gradient within 100 ft of a septic system, fuel tank, manure storage, or road-salt storage; groundwater flow direction should be confirmed with nearby well levels, not topography alone.

Well interference: two pumping wells spaced closer than roughly 100 ft in the same fracture or sand aquifer will compete for the same cone of depression; the second well's yield drops as the first's pumping rate rises.

Drought rule: a well whose pumping level approaches the pump intake at seasonal low static level will lose yield and cavitate; set pump intake at least 10 ft below the lowest anticipated pumping level.

Massachusetts well casing minimums: 6-inch minimum diameter for private wells; steel casing must extend at least 10 ft into competent bedrock and at least 18 inches above finished grade.

Casing must be new, undamaged, and of material approved for potable water; PVC casing must be Schedule 40 or heavier and steel must be new pipe meeting ASTM/API specifications; used or patched casing is not permitted.

Annular seal: the space between borehole wall and casing must be grouted from the bottom of the casing to land surface with neat cement, bentonite slurry, or approved grout; grouting is required, not optional.

Driven point (sand point) wells are limited to shallow unconsolidated sand and gravel; they are not acceptable where contamination is likely because they provide no grouted annular seal.

Dug wells must have watertight curbing extending above grade, a sealed cover, and no direct opening to surface runoff; they are the most vulnerable well type and require extra disinfection and testing.

Screen selection: slot size should retain about 50-60 percent of the formation material; a screen too fine plugs with fines, a screen too coarse passes sand and damages the pump.

Gravel pack is placed in the annulus around the screen to enlarge the effective well radius and filter fines; it must be clean, washed, and sized 4-6 times the formation grain diameter.

Well development (surging, jetting, bailing, airlifting) removes drilling mud and fines to raise specific capacity; development is complete when discharge runs clear and sand-free at design rate.

Wellhead completion: casing terminates at least 18 inches above finished grade, with a sanitary well cap that is vermin-proof and vented, and the ground slopes away from the casing on all sides.

Grout types: neat cement (high strength, heat of hydration, good for deep casing), bentonite slurry (swells, low permeability, good in dry holes), and cement-bentonite blends; each must be placed by tremie from the bottom up to avoid voids.

Tremie rule: pump grout through a pipe kept submerged in the grout column; free-falling grout from the top can bridge, segregate, and leave an unsealed annulus that is a direct contamination pathway.

Abandoned well sealing: remove the pump and obstructions, disinfect, and fill the entire well with approved material (neat cement, bentonite, or clean fill capped with grout); a well must not be left open or merely capped.

Wellhead protection area: the land surface area contributing water to a well; for a public well, the Zone I is the 400-ft radius (or 100-ft radius for a private well) within which most activities are restricted.

Sanitary seal inspection: check for cracked casing, missing cap, subsidence around the casing, and any opening that lets surface water reach the annulus; a visible gap at grade is a direct conduit.

Grout volume estimate: annular volume = pi times (borehole radius squared minus casing radius squared) times length, converted to cubic feet and then to bags of grout using the manufacturer's yield per bag.

Submersible pump setting: at least 10 ft below the lowest anticipated pumping water level and at least 5 ft above the bottom of the well; a pump set too shallow cavitates, too deep stirs up sediment.

Pump sizing rule: select a pump whose design flow falls in the middle of its performance curve, not at the curve's shutoff or maximum-flow end, so it operates efficiently and does not cycle.

Pressure tank function: a captive-air tank stores water under pressure so the pump runs in cycles, not continuously; precharge should be 2 psi below the pump cut-in pressure (typically 30/50 or 40/60 psi).

Pressure switch settings: cut-in is the low pressure that starts the pump, cut-out is the high pressure that stops it; a 20-psi differential is standard for a bladder tank.

Disinfection: shock chlorinate with a chlorine solution to at least 50-100 ppm in the well, circulate, hold at least 12-24 hours, then flush until chlorine is gone; retest for coliform after flushing.

Chlorine contact time rule: disinfection requires both concentration and time (CT); a quick flush of chlorinated water does not disinfect a well, the solution must remain in contact with the casing and water column.

Water softener and treatment: iron and manganese cause staining and taste; a softener or oxidizing filter is used, but treatment must not be used to mask a bacteriological problem that requires well repair.

Pump troubleshooting rule: low flow with normal pressure suggests a worn impeller or a dropping water level; rapid cycling suggests a waterlogged tank or failed pressure switch.

Massachusetts private well regulations are at 310 CMR 15.000 (Title 5, septic) and the Department of Environmental Protection well drilling regulations at 310 CMR 46.00; public water supply wells are governed by 310 CMR 22.00.

Well driller licensing in Massachusetts is administered by the Department of Environmental Protection under the well driller statute (M.G.L. c. 21, section 16A and related); a driller must be licensed to construct, alter, or abandon a well.

Well construction permits: a local Board of Health permit is required before drilling a private well in most Massachusetts towns; the driller must obtain the permit and post it or keep it on site.

Public water supply well approval requires a permit from MassDEP and compliance with the wellhead protection and source approval requirements of 310 CMR 22.00, including a Zone I and a source water assessment.

Well completion reports must be filed with the state and the local Board of Health within the required time after completion; the report documents location, depth, casing, grout, yield, and water quality.

Abandonment of a well requires a permit and must follow the sealing requirements; a driller may not abandon a well by simply filling it with rubble or leaving it unsealed.

Massachusetts requires that a well driller carry liability insurance and comply with continuing education requirements; license renewal is periodic and a lapsed license prohibits drilling.

Well completion report contents: owner name and address, well location, date drilled, total depth, casing diameter and depth, screen or bedrock interval, grout type and quantity, static and pumping water levels, yield test results, and disinfection record.

Yield test: pump at a steady rate for a defined period (commonly 1-4 hours), record pumping and static levels, and compute specific capacity; report the test rate, duration, and drawdown.

Water quality sampling for a new well: at minimum test for coliform bacteria, nitrate, iron, manganese, hardness, pH, and any contaminants of local concern; report results to the owner.

Permit records must be retained and made available to the local Board of Health and MassDEP on request; the driller is responsible for accurate reporting, not the homeowner.

Well location map: the report should include a sketch or coordinates showing the well relative to the house, septic system, property lines, and other wells, so setbacks can be verified.

Change of ownership: a well report and water test results should be transferred to the new owner; Massachusetts requires disclosure of well information in real estate transactions.

Recordkeeping rule: log drilling conditions (overburden depth, bedrock depth, water strikes, lost circulation) as they occur, because the completion report must reflect actual conditions, not estimates.

Coliform bacteria: total coliform presence indicates a possible pathway for pathogens; E. coli presence indicates fecal contamination and requires immediate disinfection, retesting, and investigation of the source.

Nitrate above 10 mg/L as nitrogen is the federal and Massachusetts MCL; it indicates septic, fertilizer, or manure influence and is a particular risk to infants (methemoglobinemia).

Arsenic MCL is 10 micrograms per liter; in Massachusetts, arsenic occurs naturally in some bedrock wells and requires treatment (adsorption or ion exchange) if exceeded.

Iron above 0.3 mg/L and manganese above 0.05 mg/L cause staining and taste; these are secondary standards, not health-based, but they indicate aquifer conditions and affect treatment design.

Radon in water is a Massachusetts concern in bedrock wells; testing and aeration treatment are used where levels are elevated, and the driller should report the result and recommend follow-up.

Volatile organic compounds (VOCs) such as MTBE and trichloroethylene indicate fuel or solvent contamination; a positive VOC result requires resampling, source investigation, and notification of the local Board of Health.

pH below 6.5 is corrosive and can leach lead and copper from plumbing; treatment with a neutralizing filter or soda ash feed raises pH and protects the distribution system.

Sampling protocol: use a sterile bottle, avoid touching the inside of the cap, sample before any treatment, and deliver to the lab within the holding time; a contaminated sample gives a false positive.

Drilling site safety: keep all personnel clear of rotating drill pipe and augers, wear hard hats, safety glasses, and hearing protection, and never reach into a rotating string.

Confined space rule: a well pit or vault that is not designed for continuous occupancy is a permit-required confined space; test for oxygen deficiency and toxic gas before entry and use a harness and tripod.

Electrical safety: submersible pump circuits require a properly sized breaker, a disconnect within sight of the well, and a ground fault circuit interrupter where required; never work on a pump circuit without locking out the power.

Environmental protection: contain drilling fluids and cuttings, prevent fuel and oil spills, and do not discharge chlorinated water or drilling mud to wetlands or storm drains without approval.

Site restoration: restore grade around the wellhead, reseed disturbed areas, remove all cuttings and debris, and leave the wellhead accessible with a proper cap and a clear, sloped surface.

Overhead and underground utility clearance: call 811 before drilling, maintain clearance from power lines, and locate septic, gas, and water lines before setting up the rig.

Noise and dust control: use appropriate mufflers and water spray for dust; comply with local noise ordinances and notify neighbors of scheduled drilling.

Setback minimums: 50 ft from septic tank, 100 ft from leaching field, 25 ft from property line, 10 ft from foundation and utilities; confirm with local Board of Health because towns may be stricter.

Bedrock well siting: place on competent rock, avoid fault and shear zones and rock contacts where fracture flow is unpredictable; a well in a fracture zone can draw surface water within hours.

Overburden yield depends on grain size and sorting: gravel and sand yield high, till yields low but reliable, clay and silt yield little; specific capacity (gpm per ft of drawdown) is the practical ranking test.

Static water level is measured before pumping; pumping water level is measured after drawdown stabilizes; drawdown = static minus pumping level, and specific capacity = pumping rate divided by drawdown.

Confined aquifers respond to pumping with a potentiometric surface decline, not dewatering; an artesian well may flow at land surface, requiring a packer or controlled flow to prevent uncontrolled discharge.

Contaminant pathway rule: never site a well down-gradient within 100 ft of a septic system, fuel tank, manure storage, or road-salt storage; confirm flow direction with nearby well levels, not topography alone.

Well interference: two pumping wells spaced closer than roughly 100 ft in the same fracture or sand aquifer compete for the same cone of depression, and the second well's yield drops as the first's pumping rate rises.

Drought rule: a well whose pumping level approaches the pump intake at seasonal low static level will lose yield and cavitate; set the pump intake at least 10 ft below the lowest anticipated pumping level.

Casing minimums: 6-inch minimum diameter for private wells; steel casing must extend at least 10 ft into competent bedrock and at least 18 inches above finished grade.

Casing must be new and approved for potable water; PVC must be Schedule 40 or heavier and steel must meet ASTM/API specifications; used or patched casing is not permitted.

Annular seal: the space between borehole wall and casing must be grouted from the bottom of the casing to land surface with neat cement, bentonite slurry, or approved grout; grouting is required, not optional.

Driven point (sand point) wells are limited to shallow unconsolidated sand and gravel; they are not acceptable where contamination is likely because they provide no grouted annular seal.

Dug wells must have watertight curbing extending above grade, a sealed cover, and no direct opening to surface runoff; they are the most vulnerable well type and require extra disinfection and testing.

Screen selection: slot size should retain about 50-60 percent of the formation material; a screen too fine plugs with fines, a screen too coarse passes sand and damages the pump.

Gravel pack is placed in the annulus around the screen to enlarge the effective well radius and filter fines; it must be clean, washed, and sized 4-6 times the formation grain diameter.

Well development (surging, jetting, bailing, airlifting) removes drilling mud and fines to raise specific capacity; development is complete when discharge runs clear and sand-free at design rate.

Wellhead completion: casing terminates at least 18 inches above finished grade, with a sanitary well cap that is vermin-proof and vented, and the ground slopes away from the casing on all sides.

Grout types: neat cement (high strength, heat of hydration, good for deep casing), bentonite slurry (swells, low permeability, good in dry holes), and cement-bentonite blends; each must be placed by tremie from the bottom up to avoid voids.

Tremie rule: pump grout through a pipe kept submerged in the grout column; free-falling grout from the top can bridge, segregate, and leave an unsealed annulus that is a direct contamination pathway.

Abandoned well sealing: remove the pump and obstructions, disinfect, and fill the entire well with approved material (neat cement, bentonite, or clean fill capped with grout); a well must not be left open or merely capped.

Wellhead protection area: the land surface area contributing water to a well; for a public well, Zone I is the 400-ft radius (or 100-ft radius for a private well) within which most activities are restricted.

Sanitary seal inspection: check for cracked casing, missing cap, subsidence around the casing, and any opening that lets surface water reach the annulus; a visible gap at grade is a direct conduit.

Grout volume estimate: annular volume = pi times (borehole radius squared minus casing radius squared) times length, converted to cubic feet and then to bags of grout using the manufacturer's yield per bag.

Submersible pump setting: at least 10 ft below the lowest anticipated pumping water level and at least 5 ft above the bottom of the well; a pump set too shallow cavitates, too deep stirs up sediment.

Pump sizing rule: select a pump whose design flow falls in the middle of its performance curve, not at the curve's shutoff or maximum-flow end, so it operates efficiently and does not cycle.

Pressure tank function: a captive-air tank stores water under pressure so the pump runs in cycles, not continuously; precharge should be 2 psi below the pump cut-in pressure (typically 30/50 or 40/60 psi).

Pressure switch settings: cut-in is the low pressure that starts the pump, cut-out is the high pressure that stops it; a 20-psi differential is standard for a bladder tank.

Disinfection: shock chlorinate with a chlorine solution to at least 50-100 ppm in the well, circulate, hold at least 12-24 hours, then flush until chlorine is gone; retest for coliform after flushing.

Chlorine contact time rule: disinfection requires both concentration and time (CT); a quick flush of chlorinated water does not disinfect a well, the solution must remain in contact with the casing and water column.

Water softener and treatment: iron and manganese cause staining and taste; a softener or oxidizing filter is used, but treatment must not be used to mask a bacteriological problem that requires well repair.

Pump troubleshooting rule: low flow with normal pressure suggests a worn impeller or a dropping water level; rapid cycling suggests a waterlogged tank or failed pressure switch.

Massachusetts private well regulations are at 310 CMR 15.000 (Title 5, septic) and the Department of Environmental Protection well drilling regulations at 310 CMR 46.00; public water supply wells are governed by 310 CMR 22.00.

Well driller licensing in Massachusetts is administered by the Department of Environmental Protection under the well driller statute (M.G.L. c. 21, section 16A and related); a driller must be licensed to construct, alter, or abandon a well.

Well construction permits: a local Board of Health permit is required before drilling a private well in most Massachusetts towns; the driller must obtain the permit and keep it available on site.

Public water supply well approval requires a permit from MassDEP and compliance with the wellhead protection and source approval requirements of 310 CMR 22.00, including a Zone I and a source water assessment.

Well completion reports must be filed with the state and the local Board of Health within the required time after completion; the report documents location, depth, casing, grout, yield, and water quality.

Abandonment of a well requires a permit and must follow the sealing requirements; a driller may not abandon a well by simply filling it with rubble or leaving it unsealed.

Massachusetts requires that a well driller carry liability insurance and comply with continuing education requirements; license renewal is periodic and a lapsed license prohibits drilling.

Well completion report contents: owner name and address, well location, date drilled, total depth, casing diameter and depth, screen or bedrock interval, grout type and quantity, static and pumping water levels, yield test results, and disinfection record.

Yield test: pump at a steady rate for a defined period (commonly 1-4 hours), record pumping and static levels, and compute specific capacity; report the test rate, duration, and drawdown.

Water quality sampling for a new well: at minimum test for coliform bacteria, nitrate, iron, manganese, hardness, pH, and any contaminants of local concern; report results to the owner.

Permit records must be retained and made available to the local Board of Health and MassDEP on request; the driller is responsible for accurate reporting, not the homeowner.

Well location map: the report should include a sketch or coordinates showing the well relative to the house, septic system, property lines, and other wells, so setbacks can be verified.

Change of ownership: a well report and water test results should be transferred to the new owner; Massachusetts requires disclosure of well information in real estate transactions.

Recordkeeping rule: log drilling conditions (overburden depth, bedrock depth, water strikes, lost circulation) as they occur, because the completion report must reflect actual conditions, not estimates.

Coliform bacteria: total coliform presence indicates a possible pathway for pathogens; E. coli presence indicates fecal contamination and requires immediate disinfection, retesting, and investigation of the source.

Nitrate above 10 mg/L as nitrogen is the federal and Massachusetts MCL; it indicates septic, fertilizer, or manure influence and is a particular risk to infants (methemoglobinemia).

Arsenic MCL is 10 micrograms per liter; in Massachusetts, arsenic occurs naturally in some bedrock wells and requires treatment (adsorption or ion exchange) if exceeded.

Iron above 0.3 mg/L and manganese above 0.05 mg/L cause staining and taste; these are secondary standards, not health-based, but they indicate aquifer conditions and affect treatment design.

Radon in water is a Massachusetts concern in bedrock wells; testing and aeration treatment are used where levels are elevated, and the driller should report the result and recommend follow-up.

Volatile organic compounds (VOCs) such as MTBE and trichloroethylene indicate fuel or solvent contamination; a positive VOC result requires resampling, source investigation, and notification of the local Board of Health.

pH below 6.5 is corrosive and can leach lead and copper from plumbing; treatment with a neutralizing filter or soda ash feed raises pH and protects the distribution system.

Sampling protocol: use a sterile bottle, avoid touching the inside of the cap, sample before any treatment, and deliver to the lab within the holding time; a contaminated sample gives a false positive.

Drilling site safety: keep all personnel clear of rotating drill pipe and augers, wear hard hats, safety glasses, and hearing protection, and never reach into a rotating string.

Confined space rule: a well pit or vault that is not designed for continuous occupancy is a permit-required confined space; test for oxygen deficiency and toxic gas before entry and use a harness and tripod.

Electrical safety: submersible pump circuits require a properly sized breaker, a disconnect within sight of the well, and a ground fault circuit interrupter where required; never work on a pump circuit without locking out the power.

Environmental protection: contain drilling fluids and cuttings, prevent fuel and oil spills, and do not discharge chlorinated water or drilling mud to wetlands or storm drains without approval.

Site restoration: restore grade around the wellhead, reseed disturbed areas, remove all cuttings and debris, and leave the wellhead accessible with a proper cap and a clear, sloped surface.

Overhead and underground utility clearance: call 811 before drilling, maintain clearance from power lines, and locate septic, gas, and water lines before setting up the rig.

Noise and dust control: use appropriate mufflers and water spray for dust; comply with local noise ordinances and notify neighbors of scheduled drilling.

Setback minimums: 50 ft from septic tank, 100 ft from leaching field, 25 ft from property line, 10 ft from foundation and utilities; confirm with the local Board of Health because towns may be stricter.

Bedrock well siting: place on competent rock, avoid fault and shear zones and rock contacts where fracture flow is unpredictable; a well in a fracture zone can draw surface water within hours.

Overburden yield depends on grain size and sorting: gravel and sand yield high, till yields low but reliable, clay and silt yield little; specific capacity (gpm per ft of drawdown) is the practical ranking test.

Static water level is measured before pumping; pumping water level is measured after drawdown stabilizes; drawdown = static minus pumping level, and specific capacity = pumping rate divided by drawdown.

Confined aquifers respond to pumping with a potentiometric surface decline, not dewatering; an artesian well may flow at land surface, requiring a packer or controlled flow to prevent uncontrolled discharge.

Contaminant pathway rule: never site a well down-gradient within 100 ft of a septic system, fuel tank, manure storage, or road-salt storage; confirm flow direction with nearby well levels, not topography alone.

Well interference: two pumping wells spaced closer than roughly 100 ft in the same fracture or sand aquifer compete for the same cone of depression, and the second well's yield drops as the first's pumping rate rises.

Drought rule: a well whose pumping level approaches the pump intake at seasonal low static level will lose yield and cavitate; set the pump intake at least 10 ft below the lowest anticipated pumping level.

Casing minimums: 6-inch minimum diameter for private wells; steel casing must extend at least 10 ft into competent bedrock and at least 18 inches above finished grade.

Casing must be new and approved for potable water; PVC must be Schedule 40 or heavier and steel must meet ASTM/API specifications; used or patched casing is not permitted.

Annular seal: the space between borehole wall and casing must be grouted from the bottom of the casing to land surface with neat cement, bentonite slurry, or approved grout; grouting is required, not optional.

Driven point (sand point) wells are limited to shallow unconsolidated sand and gravel; they are not acceptable where contamination is likely because they provide no grouted annular seal.

Dug wells must have watertight curbing extending above grade, a sealed cover, and no direct opening to surface runoff; they are the most vulnerable well type and require extra disinfection and testing.

Screen selection: slot size should retain about 50-60 percent of the formation material; a screen too fine plugs with fines, a screen too coarse passes sand and damages the pump.

Gravel pack is placed in the annulus around the screen to enlarge the effective well radius and filter fines; it must be clean, washed, and sized 4-6 times the formation grain diameter.

Well development (surging, jetting, bailing, airlifting) removes drilling mud and fines to raise specific capacity; development is complete when discharge runs clear and sand-free at design rate.

Wellhead completion: casing terminates at least 18 inches above finished grade, with a sanitary well cap that is vermin-proof and vented, and the ground slopes away from the casing on all sides.

Grout types: neat cement (high strength, heat of hydration, good for deep casing), bentonite slurry (swells, low permeability, good in dry holes), and cement-bentonite blends; each must be placed by tremie from the bottom up to avoid voids.

Tremie rule: pump grout through a pipe kept submerged in the grout column; free-falling grout from the top can bridge, segregate, and leave an unsealed annulus that is a direct contamination pathway.

Abandoned well sealing: remove the pump and obstructions, disinfect, and fill the entire well with approved material (neat cement, bentonite, or clean fill capped with grout); a well must not be left open or merely capped.

Wellhead protection area: the land surface area contributing water to a well; for a public well, Zone I is the 400-ft radius (or 100-ft radius for a private well) within which most activities are restricted.

Sanitary seal inspection: check for cracked casing, missing cap, subsidence around the casing, and any opening that lets surface water reach the annulus; a visible gap at grade is a direct conduit.

Grout volume estimate: annular volume = pi times (borehole radius squared minus casing radius squared) times length, converted to cubic feet and then to bags of grout using the manufacturer's yield per bag.

Submersible pump setting: at least 10 ft below the lowest anticipated pumping water level and at least 5 ft above the bottom of the well; a pump set too shallow cavitates, too deep stirs up sediment.

Pump sizing rule: select a pump whose design flow falls in the middle of its performance curve, not at the curve's shutoff or maximum-flow end, so it operates efficiently and does not cycle.

Pressure tank function: a captive-air tank stores water under pressure so the pump runs in cycles, not continuously; precharge should be 2 psi below the pump cut-in pressure (typically 30/50 or 40/60 psi).

Pressure switch settings: cut-in is the low pressure that starts the pump, cut-out is the high pressure that stops it; a 20-psi differential is standard for a bladder tank.

Disinfection: shock chlorinate with a chlorine solution to at least 50-100 ppm in the well, circulate, hold at least 12-24 hours, then flush until chlorine is gone; retest for coliform after flushing.

Chlorine contact time rule: disinfection requires both concentration and time (CT); a quick flush of chlorinated water does not disinfect a well, the solution must remain in contact with the casing and water column.

Water softener and treatment: iron and manganese cause staining and taste; a softener or oxidizing filter is used, but treatment must not be used to mask a bacteriological problem that requires well repair.

Pump troubleshooting rule: low flow with normal pressure suggests a worn impeller or a dropping water level; rapid cycling suggests a waterlogged tank or failed pressure switch.

Massachusetts private well regulations are at 310 CMR 15.000 (Title 5, septic) and the Department of Environmental Protection well drilling regulations at 310 CMR 46.00; public water supply wells are governed by 310 CMR 22.00.

Well driller licensing in Massachusetts is administered by the Department of Environmental Protection under the well driller statute (M.G.L. c. 21, section 16A and related); a driller must be licensed to construct, alter, or abandon a well.

Well construction permits: a local Board of Health permit is required before drilling a private well in most Massachusetts towns; the driller must obtain the permit and keep it available on site.

Public water supply well approval requires a permit from MassDEP and compliance with the wellhead protection and source approval requirements of 310 CMR 22.00, including a Zone I and a source water assessment.

Well completion reports must be filed with the state and the local Board of Health within the required time after completion; the report documents location, depth, casing, grout, yield, and water quality.

Abandonment of a well requires a permit and must follow the sealing requirements; a driller may not abandon a well by simply filling it with rubble or leaving it unsealed.

Massachusetts requires that a well driller carry liability insurance and comply with continuing education requirements; license renewal is periodic and a lapsed license prohibits drilling.

Well completion report contents: owner name and address, well location, date drilled, total depth, casing diameter and depth, screen or bedrock interval, grout type and quantity, static and pumping water levels, yield test results, and disinfection record.

Yield test: pump at a steady rate for a defined period (commonly 1-4 hours), record pumping and static levels, and compute specific capacity; report the test rate, duration, and drawdown.

Water quality sampling for a new well: at minimum test for coliform bacteria, nitrate, iron, manganese, hardness, pH, and any contaminants of local concern; report results to the owner.

Permit records must be retained and made available to the local Board of Health and MassDEP on request; the driller is responsible for accurate reporting, not the homeowner.

Well location map: the report should include a sketch or coordinates showing the well relative to the house, septic system, property lines, and other wells, so setbacks can be verified.

Change of ownership: a well report and water test results should be transferred to the new owner; Massachusetts requires disclosure of well information in real estate transactions.

Recordkeeping rule: log drilling conditions (overburden depth, bedrock depth, water strikes, lost circulation) as they occur, because the completion report must reflect actual conditions, not estimates.

Coliform bacteria: total coliform presence indicates a possible pathway for pathogens; E. coli presence indicates fecal contamination and requires immediate disinfection, retesting, and investigation of the source.

Nitrate above 10 mg/L as nitrogen is the federal and Massachusetts MCL; it indicates septic, fertilizer, or manure influence and is a particular risk to infants (methemoglobinemia).

Arsenic MCL is 10 micrograms per liter; in Massachusetts, arsenic occurs naturally in some bedrock wells and requires treatment (adsorption or ion exchange) if exceeded.

Iron above 0.3 mg/L and manganese above 0.05 mg/L cause staining and taste; these are secondary standards, not health-based, but they indicate aquifer conditions and affect treatment design.

Radon in water is a Massachusetts concern in bedrock wells; testing and aeration treatment are used where levels are elevated, and the driller should report the result and recommend follow-up.

Volatile organic compounds (VOCs) such as MTBE and trichloroethylene indicate fuel or solvent contamination; a positive VOC result requires resampling, source investigation, and notification of the local Board of Health.

pH below 6.5 is corrosive and can leach lead and copper from plumbing; treatment with a neutralizing filter or soda ash feed raises pH and protects the distribution system.

Sampling protocol: use a sterile bottle, avoid touching the inside of the cap, sample before any treatment, and deliver to the lab within the holding time; a contaminated sample gives a false positive.

Drilling site safety: keep all personnel clear of rotating drill pipe and augers, wear hard hats, safety glasses, and hearing protection, and never reach into a rotating string.

Confined space rule: a well pit or vault that is not designed for continuous occupancy is a permit-required confined space; test for oxygen deficiency and toxic gas before entry and use a harness and tripod.

Electrical safety: submersible pump circuits require a properly sized breaker, a disconnect within sight of the well, and a ground fault circuit interrupter where required; never work on a pump circuit without locking out the power.

Environmental protection: contain drilling fluids and cuttings, prevent fuel and oil spills, and do not discharge chlorinated water or drilling mud to wetlands or storm drains without approval.

Site restoration: restore grade around the wellhead, reseed disturbed areas, remove all cuttings and debris, and leave the wellhead accessible with a proper cap and a clear, sloped surface.

Overhead and underground utility clearance: call 811 before drilling, maintain clearance from power lines, and locate septic, gas, and water lines before setting up the rig.

Noise and dust control: use appropriate mufflers and water spray for dust; comply with local noise ordinances and notify neighbors of scheduled drilling.

Setback minimums: 50 ft from septic tank, 100 ft from leaching field, 25 ft from property line, 10 ft from foundation and utilities; confirm with the local Board of Health because towns may be stricter.

Bedrock well siting: place on competent rock, avoid fault and shear zones and rock contacts where fracture flow is unpredictable; a well in a fracture zone can draw surface water within hours.

Overburden yield depends on grain size and sorting: gravel and sand yield high, till yields low but reliable, clay and silt yield little; specific capacity (gpm per ft of drawdown) is the practical ranking test.

Static water level is measured before pumping; pumping water level is measured after drawdown stabilizes; drawdown = static minus pumping level, and specific capacity = pumping rate divided by drawdown.

Confined aquifers respond to pumping with a potentiometric surface decline, not dewatering; an artesian well may flow at land surface, requiring a packer or controlled flow to prevent uncontrolled discharge.

Contaminant pathway rule: never site a well down-gradient within 100 ft of a septic system, fuel tank, manure storage, or road-salt storage; confirm flow direction with nearby well levels, not topography alone.

Well interference: two pumping wells spaced closer than roughly 100 ft in the same fracture or sand aquifer compete for the same cone of depression, and the second well's yield drops as the first's pumping rate rises.

Drought rule: a well whose pumping level approaches the pump intake at seasonal low static level will lose yield and cavitate; set the pump intake at least 10 ft below the lowest anticipated pumping level.

Casing minimums: 6-inch minimum diameter for private wells; steel casing must extend at least 10 ft into competent bedrock and at least 18 inches above finished grade.

Casing must be new and approved for potable water; PVC must be Schedule 40 or heavier and steel must meet ASTM/API specifications; used or patched casing is not permitted.

Annular seal: the space between borehole wall and casing must be grouted from the bottom of the casing to land surface with neat cement, bentonite slurry, or approved grout; grouting is required, not optional.

Driven point (sand point) wells are limited to shallow unconsolidated sand and gravel; they are not acceptable where contamination is likely because they provide no grouted annular seal.

Dug wells must have watertight curbing extending above grade, a sealed cover, and no direct opening to surface runoff; they are the most vulnerable well type and require extra disinfection and testing.

Screen selection: slot size should retain about 50-60 percent of the formation material; a screen too fine plugs with fines, a screen too coarse passes sand and damages the pump.

Gravel pack is placed in the annulus around the screen to enlarge the effective well radius and filter fines; it must be clean, washed, and sized 4-6 times the formation grain diameter.

Well development (surging, jetting, bailing, airlifting) removes drilling mud and fines to raise specific capacity; development is complete when discharge runs clear and sand-free at design rate.

Wellhead completion: casing terminates at least 18 inches above finished grade, with a sanitary well cap that is vermin-proof and vented, and the ground slopes away from the casing on all sides.

Grout types: neat cement (high strength, heat of hydration, good for deep casing), bentonite slurry (swells, low permeability, good in dry holes), and cement-bentonite blends; each must be placed by tremie from the bottom up to avoid voids.

Tremie rule: pump grout through a pipe kept submerged in the grout column; free-falling grout from the top can bridge, segregate, and leave an unsealed annulus that is a direct contamination pathway.

Abandoned well sealing: remove the pump and obstructions, disinfect, and fill the entire well with approved material (neat cement, bentonite, or clean fill capped with grout); a well must not be left open or merely capped.

Wellhead protection area: the land surface area contributing water to a well; for a public well, Zone I is the 400-ft radius (or 100-ft radius for a private well) within which most activities are restricted.

Sanitary seal inspection: check for cracked casing, missing cap, subsidence around the casing, and any opening that lets surface water reach the annulus; a visible gap at grade is a direct conduit.

Grout volume estimate: annular volume = pi times (borehole radius squared minus casing radius squared) times length, converted to cubic feet and then to bags of grout using the manufacturer's yield per bag.

Submersible pump setting: at least 10 ft below the lowest anticipated pumping water level and at least 5 ft above the bottom of the well; a pump set too shallow cavitates, too deep stirs up sediment.

Pump sizing rule: select a pump whose design flow falls in the middle of its performance curve, not at the curve's shutoff or maximum-flow end, so it operates efficiently and does not cycle.

Pressure tank function: a captive-air tank stores water under pressure so the pump runs in cycles, not continuously; precharge should be 2 psi below the pump cut-in pressure (typically 30/50 or 40/60 psi).

Pressure switch settings: cut-in is the low pressure that starts the pump, cut-out is the high pressure that stops it; a 20-psi differential is standard for a bladder tank.

Disinfection: shock chlorinate with a chlorine solution to at least 50-100 ppm in the well, circulate, hold at least 12-24 hours, then flush until chlorine is gone; retest for coliform after flushing.

Chlorine contact time rule: disinfection requires both concentration and time (CT); a quick flush of chlorinated water does not disinfect a well, the solution must remain in contact with the casing and water column.

Water softener and treatment: iron and manganese cause staining and taste; a softener or oxidizing filter is used, but treatment must not be used to mask a bacteriological problem that requires well repair.

Pump troubleshooting rule: low flow with normal pressure suggests a worn impeller or a dropping water level; rapid cycling suggests a waterlogged tank or failed pressure switch.

Massachusetts private well regulations are at 310 CMR 15.000 (Title 5, septic) and the Department of Environmental Protection well drilling regulations at 310 CMR 46.00; public water supply wells are governed by 310 CMR 22.00.

Well driller licensing in Massachusetts is administered by the Department of Environmental Protection under the well driller statute (M.G.L. c. 21, section 16A and related); a driller must be licensed to construct, alter, or abandon a well.

Well construction permits: a local Board of Health permit is required before drilling a private well in most Massachusetts towns; the driller must obtain the permit and keep it available on site.

Public water supply well approval requires a permit from MassDEP and compliance with the wellhead protection and source approval requirements of 310 CMR 22.00, including a Zone I and a source water assessment.

Well completion reports must be filed with the state and the local Board of Health within the required time after completion; the report documents location, depth, casing, grout, yield, and water quality.

Abandonment of a well requires a permit and must follow the sealing requirements; a driller may not abandon a well by simply filling it with rubble or leaving it unsealed.

Massachusetts requires that a well driller carry liability insurance and comply with continuing education requirements; license renewal is periodic and a lapsed license prohibits drilling.

Well completion report contents: owner name and address, well location, date drilled, total depth, casing diameter and depth, screen or bedrock interval, grout type and quantity, static and pumping water levels, yield test results, and disinfection record.

Yield test: pump at a steady rate for a defined period (commonly 1-4 hours), record pumping and static levels, and compute specific capacity; report the test rate, duration, and drawdown.

Water quality sampling for a new well: at minimum test for coliform bacteria, nitrate, iron, manganese, hardness, pH, and any contaminants of local concern; report results to the owner.

Permit records must be retained and made available to the local Board of Health and MassDEP on request; the driller is responsible for accurate reporting, not the homeowner.

Well location map: the report should include a sketch or coordinates showing the well relative to the house, septic system, property lines, and other wells, so setbacks can be verified.

Change of ownership: a well report and water test results should be transferred to the new owner; Massachusetts requires disclosure of well information in real estate transactions.

Recordkeeping rule: log drilling conditions (overburden depth, bedrock depth, water strikes, lost circulation) as they occur, because the completion report must reflect actual conditions, not estimates.

Coliform bacteria: total coliform presence indicates a possible pathway for pathogens; E. coli presence indicates fecal contamination and requires immediate disinfection, retesting, and investigation of the source.

Nitrate above 10 mg/L as nitrogen is the federal and Massachusetts MCL; it indicates septic, fertilizer, or manure influence and is a particular risk to infants (methemoglobinemia).

Arsenic MCL is 10 micrograms per liter; in Massachusetts, arsenic occurs naturally in some bedrock wells and requires treatment (adsorption or ion exchange) if exceeded.

Iron above 0.3 mg/L and manganese above 0.05 mg/L cause staining and taste; these are secondary standards, not health-based, but they indicate aquifer conditions and affect treatment design.

Radon in water is a Massachusetts concern in bedrock wells; testing and aeration treatment are used where levels are elevated, and the driller should report the result and recommend follow-up.

Volatile organic compounds (VOCs) such as MTBE and trichloroethylene indicate fuel or solvent contamination; a positive VOC result requires resampling, source investigation, and notification of the local Board of Health.

pH below 6.5 is corrosive and can leach lead and copper from plumbing; treatment with a neutralizing filter or soda ash feed raises pH and protects the distribution system.

Sampling protocol: use a sterile bottle, avoid touching the inside of the cap, sample before any treatment, and deliver to the lab within the holding time; a contaminated sample gives a false positive.

Drilling site safety: keep all personnel clear of rotating drill pipe and augers, wear hard hats, safety glasses, and hearing protection, and never reach into a rotating string.

Confined space rule: a well pit or vault that is not designed for continuous occupancy is a permit-required confined space; test for oxygen deficiency and toxic gas before entry and use a harness and tripod.

Electrical safety: submersible pump circuits require a properly sized breaker, a disconnect within sight of the well, and a ground fault circuit interrupter where required; never work on a pump circuit without locking out the power.

Environmental protection: contain drilling fluids and cuttings, prevent fuel and oil spills, and do not discharge chlorinated water or drilling mud to wetlands or storm drains without approval.

Site restoration: restore grade around the wellhead, reseed disturbed areas, remove all cuttings and debris, and leave the wellhead accessible with a proper cap and a clear, sloped surface.

Overhead and underground utility clearance: call 811 before drilling, maintain clearance from power lines, and locate septic, gas, and water lines before setting up the rig.

Noise and dust control: use appropriate mufflers and water spray for dust; comply with local noise ordinances and notify neighbors of scheduled drilling.