EPA Lead Risk Assessor cheat sheet

TSCA Title IV: Section 402 requires EPA accreditation of training programs and certification of individuals and firms performing lead-based paint activities; Section 404 covers lead hazard reduction training grants; Section 406 authorizes the real estate disclosure rule.

40 CFR Part 745 structure: Subpart L (lead-based paint activities work practice standards and certification), Subpart E (renovation, repair and painting), Subpart F (Section 1018 disclosure), Subpart Q (state and local programs).

Target housing means residential dwellings constructed before 1978, excluding housing for the elderly or disabled (unless a child under age 6 resides or is expected to reside) and zero-bedroom dwellings.

Child-occupied facility: a building or portion visited regularly by the same child under age 6 at least 2 days per week, at least 3 hours per day, at least 60 hours per year, or a combined 6 hours per week.

Section 1018 disclosure (40 CFR 745.107): seller or landlord must disclose known lead-based paint and hazards, give the EPA pamphlet 'Protect Your Family From Lead in Your Home,' and allow a 10-day period for a risk assessment or inspection (purchaser may waive in writing).

Certification: individuals (inspector, risk assessor, supervisor, worker, project designer) and firms are certified by EPA or an authorized state program; certifications expire every 3 years and require an accredited refresher course for renewal.

HUD 24 CFR Part 35 (Lead Safe Housing Rule) applies to federally owned or assisted pre-1978 housing and requires a risk assessment or paint inspection plus hazard assessment where a child under 6 resides; its dust and soil hazard standards match EPA's.

Recordkeeping: certified firms retain inspection, risk assessment, and abatement records (reports, sample results, calibration logs, clearance data) for at least 3 years; authorized states may require longer retention.

Abatement in target housing must be performed by a certified firm using certified supervisors and workers, and must be followed by clearance by a certified inspector, risk assessor, or sampling technician who did not perform the abatement.

No safe blood lead level in children has been identified; CDC's blood lead reference value is 3.5 µg/dL, the 97.5th percentile of the U.S. population aged 1–5 years (NHANES 2015–2018).

Historical benchmarks: 10 µg/dL was the CDC level of concern from 1991; 5 µg/dL was used from 2012 to 2021; current terminology is 'reference value,' used to prioritize follow-up rather than to define poisoning.

Lead inhibits aminolevulinic acid dehydratase and ferrochelatase in the heme pathway, causing accumulation of ALA and zinc protoporphyrin and producing microcytic, hypochromic anemia.

Neurologic effects in children include reduced IQ, attention and executive-function deficits, delayed pubertal development, hearing loss, and growth retardation; effects are inversely related to blood lead with no threshold.

Children absorb approximately 40–50 percent of ingested lead, versus about 10–15 percent in adults; iron, calcium, and zinc deficiency increase gastrointestinal absorption.

The dominant pathway for young children is ingestion of lead-contaminated house dust and soil through normal hand-to-mouth activity; dust lead loading is the best single environmental predictor of children's blood lead.

Lead crosses the placenta freely; maternal blood lead and mobilization of bone lead stores during pregnancy expose the fetus, and pregnancy/lactation are treated as susceptible periods.

Inorganic lead distributes to bone with a half-life of years to decades; soft-tissue half-life is about 30 days; a blood lead result reflects recent exposure plus lead mobilized from bone.

OSHA construction lead standard (29 CFR 1926.62): permissible exposure limit 50 µg/m³ as an 8-hour TWA, action level 30 µg/m³, and medical removal at a blood lead of 50 µg/dL averaged over the three most recent samples.

Federal definition: lead-based paint is paint containing 1.0 mg/cm² lead as measured by XRF, or 0.5 percent lead by weight in a paint chip (dry-weight basis); either criterion qualifies a component as positive.

XRF calibration verification uses a NIST-traceable reference material (e.g., NIST SRM 2579) at the start of each day, after every 4 hours of use, and at the end of the day; results are logged.

Standard protocol is one reading per component; if the reading falls within the instrument's inconclusive range near the 1.0 mg/cm² threshold, two additional readings are taken and the mean of the three determines classification.

Substrate correction is required on drywall, plaster, brick, concrete, and metal, and is performed by subtracting the measured or default substrate lead value from the component reading.

Common XRF error sources: substrate interference (false positive), paint of low total mass or thin films (false negative), failed or damaged probe window, incorrect instrument mode, and peeling or dirty paint surfaces.

Paint chip sampling removes all paint layers down to bare substrate over a measured area (commonly 2 in × 2 in / 4 in²), collects the entire chip including underlayers, and excludes substrate material.

Laboratory analysis uses flame or graphite furnace atomic absorption or ICP-AES; results are reported as percent lead by weight, and 0.5 percent or greater is lead-based paint.

An inspection tests all accessible components in each selected room on the side accessible to occupants, recording component type, substrate, paint condition, and instrument reading on a standard form.

Inspection versus risk assessment: an inspection determines only the presence, location, and extent of lead-based paint; it does not include dust, soil, or water sampling or hazard determination.

Dust wipe methods: ASTM E1728 single-surface wipe sampling is used for clearance; ASTM E1727 composite wipe sampling is acceptable for evaluation but is not valid for clearance.

Wipe sampling areas are standardized (commonly 1 ft² or 0.093 m² on floors and window troughs; interior sills measured full length by depth), and the exact dimensions must be recorded to compute loading.

EPA/HUD dust-lead clearance and hazard standards under 40 CFR 745.227: floors 40 µg/ft², interior window sills 250 µg/ft², window troughs 400 µg/ft².

Soil standards: 400 ppm in bare soil of play areas and 1,200 ppm averaged over other bare soil areas; samples are collected from the surface to 1 inch depth.

Soil composite sampling collects 4–5 cores from a play area or within the drip line of a structure; play areas and non-play areas must be composited and reported separately.

Water sampling uses a first-draw 1-liter sample collected after at least 6 hours of stagnation without flushing or aerating; the EPA action level is 15 ppb (0.015 mg/L).

Laboratories analyzing paint, dust, and soil should be recognized under EPA's National Lead Laboratory Accreditation Program (NLLAP); reports must state the analytical method and detection limit.

Quality control includes field blanks (typically at least one per sampling batch or per 20 samples), duplicate samples, pre-cleaned templates, fresh gloves between samples, and sealed, labeled containers.

A risk assessment dust sample set includes floors, interior window sills, and window troughs in each dwelling unit assessed, plus common areas and other units as required by the protocol.

Standard sequence: occupant interview and questionnaire, visual assessment of all components, lead-based paint testing, dust/soil/water sampling, hazard evaluation against standards, and written report.

The occupant interview documents children's ages and pica behavior, renovation and repainting history, water use and plumbing, occupant occupations and hobbies, smoking, and use of exterior soil.

The exposure evaluation must address all four pathways: paint (deteriorated or friction/impact/chewable surfaces), house dust, bare soil, and drinking water.

Hazard determination compares measured values to the standards: dust 40/250/400 µg/ft² (floor/sill/trough), soil 400 ppm play areas and 1,200 ppm elsewhere, water 15 ppb, plus deteriorated or friction/impact/chewable lead-based paint.

Required report elements: property and unit identification, dates, scope, sampling locations and methods, complete results including non-detects, hazard determination, recommended options, limitations, and assessor signature with certification number.

A lead hazard screen is a limited evaluation for well-maintained housing consisting of a visual assessment plus two composite dust wipes and one soil composite; it is not equivalent to a full risk assessment.

A risk assessment describes conditions at the time of the site visit only; it is not a warranty that the property is lead-safe, and hidden or inaccessible areas are outside its scope.

Recommended options should be prioritized and separated into abatement and interim control measures, with follow-up dust testing to verify effectiveness.

Presence of lead-based paint is not itself a hazard; a hazard is a condition that may result in exposure, such as deteriorated paint, dust-lead above standards, or contaminated bare soil.

Deteriorated paint is paint that is peeling, chipping, chalking, cracking, damaged, or otherwise separated from the substrate; deteriorated lead-based paint on an accessible component is a paint hazard.

Friction surfaces (window sashes, door jambs, stair treads) and impact surfaces (doors, baseboards, moldings) with lead-based paint are hazards regardless of visible paint condition because abrasion and impact generate dust.

Chewable surfaces with lead-based paint (window sills, rails, posts, stair edges within a child's reach) are hazards regardless of condition because mouthing directly transfers lead.

Dust-lead results at or above the standards (floor 40, interior sill 250, trough 400 µg/ft²) are dust-lead hazards, and any detectable dust-lead above the standard in a unit with a child under 6 is high priority.

Bare soil at or above 400 ppm in play areas or 1,200 ppm averaged elsewhere is a soil-lead hazard; covered or paved soil is not a bare-soil exposure pathway.

Ranking factors: severity of the condition, accessibility to children under 6, presence of pica or hand-to-mouth behavior, magnitude of exceedance, and extent/number of affected components.

Water at or above 15 ppb lead at the tap is a hazard requiring source investigation, treatment, or use of alternative water for drinking and formula preparation.

Abatement permanently eliminates lead-based paint or lead hazards by component removal, replacement, enclosure, encapsulation, paint removal, or soil removal/covering, and must be followed by clearance.

Interim controls are short-term measures that reduce but do not eliminate hazards: paint stabilization, HEPA vacuuming and wet cleaning, friction and impact surface treatments, soil covering, and occupant education.

Encapsulant coatings are not permitted on friction, impact, or chewable surfaces and must be applied over a sound, properly prepared substrate per the manufacturer's specification; enclosure uses a rigid barrier instead.

Clearance after abatement requires visual inspection (no visible dust or debris, no deteriorated paint on treated surfaces) plus dust wipes meeting 40/250/400 µg/ft², performed by a certified inspector, risk assessor, or technician independent of the abatement crew.

Dust suppression and containment: wet methods, plastic sheeting, HEPA vacuums, negative air machines with HEPA filtration, sealed HVAC openings, and a clean room/decontamination unit.

Prohibited abatement practices include open-flame burning or torching of paint, machine sanding or grinding without HEPA exhaust control, hydroblasting, chemical stripping with methylene chloride, and heat guns operating at or above 1,100 °F.

Worker protection under OSHA 29 CFR 1926.62 includes exposure monitoring, respiratory protection, protective clothing, handwashing facilities, prohibition of eating and smoking in the work area, and medical surveillance.

Soil hazard control options: removal and replacement with clean soil, covering with grass, mulch, gravel, or pavement, and restriction of access to bare soil as an interim measure.

Final cleaning sequence is HEPA vacuuming, wet washing with a detergent solution, and repeat HEPA vacuuming, repeated until visual and dust-wipe clearance criteria are met.

Chain of custody documents a unique sample identifier, collection date and time, exact location or component, collector name, requested analysis, and signed transfers; each container must be sealed before transfer.

All results must be reported as generated, including non-detects and quality-control failures; altering, discarding, or selectively presenting data is a data-integrity violation.

Conflict of interest: any financial interest in the property or in abatement or contracting services must be disclosed in writing; assessment and abatement are best performed by separate parties.

Field quality control includes at least one field blank per sampling batch (commonly one per 20 samples or per sampling event), duplicate or split samples where appropriate, and documented instrument calibration and maintenance logs.

Project records, including XRF calibration logs, sampling data, laboratory reports, and the final report, are retained for at least 3 years for EPA lead-based paint activities.

Report limitations should state that findings reflect conditions on the sampling date, that concealed or inaccessible areas were not evaluated, and that the report is not a warranty of lead safety.

Communication with owners and occupants should use plain language, identify the standards applied, explain the relative significance of each finding, and describe recommended next steps including clearance retesting.

Information collected during the occupant interview is confidential and is not released to third parties without the occupant's consent, except as required by law or by the client's regulatory obligation to disclose.