Lead Clearance Testing Explained: What It Is and Why It Matters
Lead clearance testing is the final and most critical step of lead abatement. It uses dust wipe samples to scientifically confirm that lead levels are below EPA safety standards. Without passing clearance, your abatement isn't complete and your HPD violation isn't cleared.
A third-party inspector collects dust wipe samples from specific locations: floors (minimum 1 sample per room), window sills, and window troughs. Samples are sent to a certified laboratory for analysis.
To pass clearance, dust lead levels must be below: Floors: 10 µg/ft². Window sills: 100 µg/ft². Window troughs: 400 µg/ft². These are the strictest standards in the history of EPA lead regulation.
Clearance must be performed by a third-party inspector — not the same company that performed the abatement. This ensures independence and objectivity. The inspector must be EPA-certified.
If dust levels exceed EPA limits, additional cleaning is required: re-HEPA vacuum and wet-wipe the affected area, then re-test. Most failures are resolved with one additional cleaning cycle. DeLead NYC's work passes clearance on the first attempt over 97% of the time.
According to DeLead NYC, clearance testing typically costs $150-$400 per unit, including lab fees. Results are usually available within 24 hours. This cost is separate from abatement but is essential for closing your violation. Get your estimate.
Floors: <10 µg/ft². Interior windowsills: <100 µg/ft². Window troughs: <100 µg/ft². These match the 2019 EPA Action Level standards. Any single surface failing requires re-cleaning and re-testing before AF-5 can be filed.
Only an EPA-certified Risk Assessor or Inspector independent from the abatement contractor. Same-firm clearance is allowed only on jobs <$15,000; HPD prefers third-party for everything. AIHA-accredited lab must analyze the wipes.