Private well water testing in New Jersey, by county
NJDEP says about 12% of New Jerseyans, roughly 1.1 million people, rely on a private well for drinking water. Under the state's Private Well Testing Act, well water must be tested when a property with a well is sold, and landlords must test every five years; NJDEP says about a quarter of the state's wells have been tested under the Act. Otherwise, testing is up to the owner.[1][2]
County guides
- Hunterdon County Last verified 2026-10-28
Arsenic is the big one in Hunterdon County wells: 15.7% of 13,700 wells tested under New Jersey's Private Well Testing Act (2002-2024) were over the state's 5 µg/L limit, with the ...