Twenty years of private well testing in New Jersey: A review of the United States's most comprehensive well water testing regulation

Abstract

Abstract Since the adoption of New Jersey (NJ) Private Well Testing Act (PWTA) over 20 years ago, approximately 134,000 wells have been tested, representing an estimated 34% of the private wells in NJ. The PWTA requires testing of raw water from residences with a private well at real estate transfer. Landlords are required to test private wells every five years and provide results to tenants. There are up to 43 required parameters including bacteria, volatile organic compounds (VOCs), synthetic organic compounds (SOCs), arsenic, iron, lead, mercury, nitrates, gross alpha radioactivity, uranium, three per- and polyfluoroalkyl substances (PFAS), alongside secondary contaminants iron, manganese, and pH. Among tested wells, 15.7% had at least one or more exceedance of a primary drinking water standard. The most common exceeding contaminants have historically been gross alpha radioactivity and arsenic, but since the inclusion of PFAS in 2022, over 12% of wells have exceeded for at least one PFAS. Jurisdictions interested in developing real estate private well testing policies can contemplate many of the findings, successes, and limitations of NJ's PWTA and should consider private well testing policies as a part of a larger private well program which brings together local, state, and federal resources.