Sources

All guidance in this tool derives from the primary sources below (accessed 2026-07-11). Where sources conflict, the more protective recommendation is shown. This page is regenerated whenever rules change.

• Maine CDC — Private Well Water (testing schedule, contaminants): maine.gov/dhhs/mecdc — wells & drinking water pages
• Maine Tracking Network — Private Well Water Quality (town-level arsenic/uranium data; ~45,000 wells, 1999–2019): data.mainepublichealth.gov
• Maine DEP — PFAS investigation of licensed sludge/septage land application sites: maine.gov/dep/spills/topics/pfas/
• Maine Geological Survey — well drillers database, bedrock geology: maine.gov/dacf/mgs
• 22 M.R.S. §2660-Y (rental wells, arsenic) and 33 M.R.S. §173 (seller disclosure): legislature.maine.gov
• US EPA — Private drinking water wells; PFAS drinking water regulation: epa.gov/privatewells
• HUD Handbook 4000.1 — individual water system requirements (FHA): hud.gov
• VA Lender Handbook / USDA HB-1-3555 — water requirements: benefits.va.gov, rd.usda.gov
• USGS — arsenic in New England bedrock aquifers (>10% exceedance); domestic well population estimates: usgs.gov

Statistics used in this tool

• "More than half of Maine households use private wells" — Maine CDC.
• "About 1 in 10 Maine wells has arsenic above the federal limit (10 µg/L)" — Maine CDC / USGS.
• "Bacteria samples must reach the lab within about 30 hours" — EPA holding-time guidance; confirm specifics with the lab.

What we deliberately do not use

Individual test results, customer records, address-level risk claims, or any dataset whose license or resolution can't support a public claim. Town/county context is educational only.