What Actually Gets Tested When You Buy or Sell a Home with a Well in New Jersey

What does New Jersey require to be tested when a home with a private well is sold? Under the Private Well Testing Act, sellers must test for a required panel of microbial, metal, chemical, and PFAS contaminants. In this area, sellers generally remediate any failing result and deliver passing results before closing rather than leaving it as a buyer negotiation.

If you read the septic post or the home inspection post earlier this month, you already know where this one is headed. Well water is the other system buyers on public sewer their whole lives have never had to think about, and it comes with its own testing law, its own required panel, and its own pass-fail language that looks nothing like a home inspection report.

The Law Behind the Test

New Jersey's Private Well Testing Act, codified at N.J.A.C. 7:9E, requires certified laboratories to test private well water as part of most real estate transfers. The lab reports results using standardized language: whether results meet both primary and secondary contaminant standards, or whether one or more results fail to meet primary standards, secondary standards, or both. That distinction matters, and it's the first thing to look for on any report you receive.

Primary contaminants have health-based limits, arsenic, coliform bacteria, gross alpha, lead, mercury, nitrate, PFAS, synthetic organic compounds, uranium, and volatile organic compounds. These are the ones that can actually affect health, and a failure here is treated seriously.

Secondary contaminants, iron, manganese, and pH, affect taste, odor, or appearance rather than health. A secondary exceedance is worth addressing, but it's a different conversation than a primary one.

What's Actually on the Required Panel

The full required test panel includes:

• Microbial: total coliform, E. coli (only run if coliform is present)
• Metals: arsenic, lead, iron, manganese, and either uranium or mercury depending on your county
• General chemistry: pH and nitrate
• Volatile organic compounds (VOCs): a long list including benzene, trichloroethylene, vinyl chloride, and roughly two dozen others
• Synthetic organic compounds (SOCs): including compounds like DBCP and ethylene dibromide
• PFAS: PFOA, PFOS, and PFNA, required for real estate closings since December 1, 2021
• Radiological parameters: gross alpha, and in northern counties, an adjusted gross alpha calculation that accounts for uranium separately

Here's the Local Detail Most Buyers Never Hear

Not every county tests for the same metals, and this genuinely surprises people. Uranium testing is required in Hunterdon, Mercer, Morris, Somerset, and Warren counties. Mercury testing, instead of uranium, is required in Monmouth County. Depending on which of the six counties you're buying into, your report may look meaningfully different, and that's not a lab inconsistency, it's the regulation itself.

The PFAS Detail That Catches Even Experienced Buyers Off Guard

PFAS testing has its own wrinkle worth understanding. The legal drinking water standards, the Maximum Contaminant Levels, sit at 0.014 μg/L for PFOA and 0.013 μg/L for both PFOS and PFNA. New Jersey also maintains a separate, lower threshold called the CSRR Financial Relief Criteria, roughly a third of the legal limit for PFOA and PFOS.

That means a result can legally pass, come in under the MCL, while still exceeding the financial relief threshold. In that situation, you're not looking at a failed test, but the property owner may still be eligible for state assistance through the Spill Fund or a treatment system installation. It's a nuance worth knowing, not a red flag.

Gross Alpha and Why a "Second Count" Sometimes Appears

If the first gross alpha reading comes in under 5 pCi/L, no further testing happens. If it comes in above that, the lab runs a second count and calculates an adjusted gross alpha figure that subtracts out the uranium's contribution, since uranium is measured and regulated separately.

In northern New Jersey, uranium is typically the primary driver of an elevated gross alpha reading. In southern New Jersey, it's usually radium instead. This is purely a screening mechanism, not itself a failure, and it only becomes relevant if that first number comes back elevated.

What Happens When Something Doesn't Pass

If a result exceeds a standard, treatment is almost always available, and it's specific to the contaminant:

• Iron and manganese typically respond to a water softener or oxidation and filtration
• PFAS and volatile organic compounds are addressed with granular activated carbon filtration
• Bacteria is resolved with UV treatment or chlorination
• Elevated uranium or nitrate is treated with anion exchange or reverse osmosis

In this area, when a raw water sample doesn't meet standards, the seller generally installs or adjusts treatment and has the well retested before closing, delivering you passing results rather than asking you to accept a credit and handle it yourself. That's a meaningfully different experience than an inspection negotiation, and it's worth knowing going in so you're not blindsided by unfamiliar terminology on a report that's actually good news.

Raw Water vs. Treated Water, and Why It Matters

The PWTA requires the sample to be raw, or untreated, water, meaning it reflects what's actually coming out of the ground before any softener, filter, or treatment device touches it. If a home already has a treatment system installed, testing the raw water alone won't tell you whether that system is working.

A second sample, taken after the treatment device, confirms whether it's actually doing its job. This distinction shows up on reports as "raw" versus "treated" collection points, and it's a good detail to ask about if a home already has visible water treatment equipment in the basement or utility area.

What This Means for You

If you're buying in Hunterdon, Somerset, Morris, Monmouth, Mercer, or Warren County and the home has a well, expect this test to happen, expect it to come with more parameters than a typical home inspection, and expect that in this market, a failing raw result usually gets resolved before you ever see it. That's different from the roof or the septic system, where the burden of proof and negotiation often falls on you. Here, the system is designed to hand you a clean answer.

Frequently Asked Questions

Does every New Jersey county test for the same contaminants? No. Most parameters are tested statewide, but uranium is only required in certain counties, including Hunterdon, Mercer, Morris, Somerset, and Warren, while mercury is required in others, including Monmouth.

If a PFAS result is under the legal limit, is there still anything to know? Yes. New Jersey maintains a separate, lower financial relief threshold for certain PFAS compounds. A result can pass the legal standard while still qualifying the property for state assistance if it exceeds that lower number.

Who typically pays for well water treatment if a test doesn't pass? This is negotiable, but in this area, sellers generally handle remediation and provide the buyer with passing results before closing, rather than leaving it as a post-inspection credit negotiation.

If you're buying or selling a home with a private well anywhere in Hunterdon, Somerset, Morris, Monmouth, Mercer, or Warren County and want help reading your test report or understanding what it means for your closing timeline, call or text me today at 908.268.5402.

Jennifer Stowe Founder, Apogee Real Estate Advisors at Compass 908.268.5402 | [email protected]