Slab Termite Treatment With a Well Eight Feet Away
A termite technician inspects a 1,200-sq-ft ranch house with a monolithic slab and finds live eastern subterranean termites in a baseboard beside a bathroom and in a door frame. The homeowner also has a private well 8 ft from the front foundation and a flower bed against the slab. The technician proposes a post-construction liquid termiticide drench: trench the soil along the entire perimeter, drill the slab at the bath trap, and apply at the label dilution. The product label states that application is prohibited within 10 ft of a well and that the treated area must be kept dry for 24 hours. The homeowner wants the problem solved before a family reunion in three days.
1. Can the proposed perimeter drench be performed as planned? Explain your reasoning.
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No. The well is 8 ft from the front foundation, and the label prohibits application within 10 ft of a well. A continuous perimeter trench would require treating soil inside that 10-ft zone along the front of the house, so the planned drench cannot be completed as described. The prohibition is not avoided by drilling only at the bath trap, because the exterior trench is part of the same proposed treatment. The technician should measure and mark the 10-ft zone before doing anything else and should read the entire label, including any state groundwater restrictions. The three-day deadline does not override the label. If the company treats inside the zone anyway, it risks contaminating the well, violating the label, and creating a serious liability. The correct first step is to redesign the job around the well setback.
2. What treatment alternatives and application precautions should be considered?
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The technician should consider a baiting program for the active termites, combined with moisture control and removal of wood-to-soil contact. Bait stations can be placed outside the well setback and monitored, and they avoid a large soil drench near the well. Limited soil treatment may be possible only in areas that are outside the 10-ft zone, following the label exactly; the front section near the well would remain untreated. Interior treatment at the bath trap must also follow the label for drilled slab applications, occupant notification, and reentry. The treated area must stay dry for 24 hours, so irrigation and heavy rain should be avoided. The technician should explain to the homeowner that the well restriction limits the treatment and that termite control may take longer than three days. The family reunion does not require occupant exposure during application; the label reentry interval and ventilation directions control when people can return.
3. What documentation and follow-up should the company provide?
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The file should include a diagram showing the house, the well, the measured 10-ft setback, and the areas actually treated or left untreated. It should record the product, dilution, rate, gallons applied, application method, date, time, weather, and applicator. The technician should note the live termite evidence, the bait station locations if used, and the homeowner's agreement to the revised plan. The company should provide the label, warranty or service agreement, and reentry instructions. Follow-up should include a reinspection for new mud tubes, bait station monitoring, and correction of moisture problems. The homeowner should be told to watch for termites near the untreated front section and to avoid disturbing the treated zone. If the well is ever used for drinking water, the company should follow any label or state requirements for testing and notification. Complete records protect both the homeowner and the company if the termites persist.