Well Water Testing in NJ: What the Law Requires and What Your Results Mean

New Jersey does not leave well water testing to the homeowner at the moment of a sale. The Private Well Testing Act, signed in March 2001 with regulations that took effect September 14, 2002, makes a water test a condition of the deal. NJDEP reports that roughly 25 percent of the wells in the State have been tested under the Act.

NJDEP lists three triggers:

• Sale of any property that gets its drinking water from a private well on the property, including new construction.
• Sale of any property served by a well with fewer than 15 service connections, or one that does not regularly serve an average of at least 25 people daily for at least 60 days a year.
• Leasing of a property on a private well that is not required to be tested under another State law. Landlords must test at least once every five years.

The statute is blunt about the closing itself. Every contract of sale must include a provision requiring the testing as a condition of the sale. A closing of title cannot occur unless both the buyer and the seller have received and reviewed a copy of the water test results, and both have signed a paper certifying that they did.

Landlords carry a separate duty. Within 30 days after receipt of the test results, the lessor must provide a written copy to each rental unit on the property, and must also provide a written copy of the most recent results to any new tenant.

A well used only for purposes other than drinking water, such as watering a lawn, is outside the law. So is a home on public water. Your local health department may have its own well rules on top of the State ones, and NJDEP says that where the two overlap, the more stringent requirement is followed.

Results do not stay private between buyer and seller. The laboratory reports them to the person who requested the test, to NJDEP, and to the local health authority. NJDEP must notify the local health authority within five business days after receiving notice of any parameter above a standard. Both NJDEP and the local health authority are required to keep the address of tested wells confidential.

A PWTA test is not one reading. NJDEP describes it as a test of untreated groundwater for up to 43 parameters, and the required list lives in N.J.A.C. 7:9E-2.1.

Every sample in the State is analyzed for total coliform bacteria, nitrate, iron, manganese, pH, lead, arsenic, gross alpha particle activity, every volatile organic compound that carries a New Jersey MCL, and three synthetic organic compounds added as of March 3, 2019. If total coliform is present, the lab must also run E. coli. Gross alpha is determined using the 48 hour rapid gross alpha test.

One change matters more than any other for older paperwork. PFAS joined the list as of December 1, 2021. PFOA, PFOS and PFNA are now required in every PWTA sample statewide. A well report from 2020 sitting in a seller's file is missing them.

Two parameters depend on geography:

• Uranium is required in Bergen, Essex, Hudson, Hunterdon, Mercer, Middlesex, Morris, Passaic, Somerset, Sussex, Union and Warren counties. Every county we serve sits on that list.
• Mercury is required in Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester, Monmouth, Ocean and Salem counties.

Here is what your report is measured against, using the New Jersey standards NJDEP last revised in June 2025. One microgram per liter (µg/L) equals one part per billion.

The volatile organic compound group alone covers 26 compounds, among them benzene, trichloroethylene, tetrachloroethylene and MTBE. The three synthetic organic compounds are held to much tighter numbers: 1,2,3-trichloropropane at 0.03, ethylene dibromide at 0.05, and 1,2-dibromo-3-chloropropane at 0.20 micrograms per liter.

The size of the panel is the reason well water testing in NJ is not cheap. NJDEP estimates the average price at $1,200 to $1,500 for a full PWTA test.

NJDEP names three things that move that number: how difficult the sample is to collect, the location of the property in relation to the lab, and which parameters are required. PFAS and VOC sampling also calls for a field blank collected with the sample. Analyzing it verifies that contaminants were not accidentally introduced into the sample, and NJDEP notes there may be additional cost when that analysis is necessary.

Who pays is not fixed by law. In a sale, NJDEP says the costs are negotiated between the buyer and the seller. In a lease, the landlord must obtain and pay for the testing and provide the results to the tenant.

Voluntary testing costs far less, because NJDEP notes most labs offer a la carte testing, so you only pay for the testing you want. If all you want is an annual check on bacteria, nitrate and pH, you pay for those three and nothing else.

One honest note for anyone searching well water testing near me. Jersey Water Pros does not operate a laboratory and does not offer countertop water demonstrations. Testing that satisfies the PWTA has to come from an NJDEP-certified lab, collected by a certified sample collector. A no-charge water test offered by a company selling equipment is a sales screening, not a certified analysis, and it cannot be submitted to the State. What we offer is a free quote on treatment, plus help arranging lab testing when you want numbers you can act on.

Collection rules are where do-it-yourself testing falls apart. Under N.J.A.C. 7:9E-2.2, water samples must be collected by either a New Jersey certified laboratory or the laboratory's authorized representative. NJDEP adds that a real estate agent who falls into that category may collect samples for all contaminants except pH. A pH sample must be collected by an employee of a laboratory certified to analyze for pH.

The sample also has to be untreated. Under N.J.A.C. 7:9E-2.3, where a water treatment system is in use, the system must be disconnected or otherwise disabled before the sample is collected, or the sample must be collected at a location prior to the treatment system. Where no treatment exists, the sample comes from a primary cold water, non-aerated spigot or tap. Before a lead sample, water must be flushed through the plumbing for at least two minutes, until the water changes temperature. On a newly constructed well with no spigot or tap yet, the sample may be collected directly at the well head.

There is a practical consequence people miss. A PWTA report describes raw well water, not what comes out of your kitchen faucet after a softener or filter. If you already own treatment, ask the lab to run a second, post-treatment sample. That one does not satisfy the PWTA, but it is the only way to know whether the equipment you already own is still doing its job.

Labs report PWTA results on a reporting form provided by NJDEP that shows how the well water results compare with State and Federal drinking water standards. A few things on that form confuse people every week.

Primary standards are health based. Secondary standards are primarily aesthetic and describe how water looks, tastes and behaves. NJDEP puts pH, iron and manganese in the second group and calls their limits recommended upper limits rather than MCLs. Iron above 0.3 mg/L will stain a sink. It is not a violation of a health standard.

Coliform and nitrate are the two acute parameters, defined that way in N.J.A.C. 7:9E-1.2. If either comes back above the MCL, the rules require the certified lab to notify the person who requested the test and the local health authority within 24 hours of obtaining the results.

Gross alpha runs in two steps. A result greater than 5 pCi/L requires a second gross alpha count, and the MCL for gross alpha is 15 pCi/L. In the twelve counties where uranium is also required, including Union, Essex and Morris, the lab calculates adjusted gross alpha by subtracting uranium alpha activity from the gross alpha result. That adjusted figure carries the same 15 pCi/L MCL, and NJDEP notes it should only be calculated where uranium is required or tested.

Lead trips people up. On the NJ PWTA standards table, lead is compared against 5 micrograms per liter, drawn from the Ground Water Quality Standards at N.J.A.C. 7:9-6. That is tighter than the federal action level most articles quote.

NJDEP is direct that exceeding a standard does not automatically mean the water is unsafe to drink, because some standards are based on aesthetics and some are based on long-term health effects. Read the category, not just the flag in the margin.

A failed result does not stop a sale. NJDEP states plainly that the law does not prohibit the sale of property if the water fails one or more drinking water standards. The PWTA is a consumer information law, built so both sides know the facts before they sign. That said, NJDEP notes that in some cases and locations mortgage companies or local health departments may require treatment of the water.

Treatment itself is negotiated between buyer and seller. NJDEP says the law does not require water treatment be installed for water that fails to meet standards.

Matching treatment to the parameter is the part worth getting right, and certification is how you check a claim:

• Bacteria: systems certified to NSF/ANSI 55 Class A for ultraviolet disinfection. Class A is the disinfection class. Class B units are listed as supplemental treatment and are not the answer to a coliform hit.
• Nitrate: systems certified to NSF/ANSI 58 for reduction of nitrate and nitrite, which is a listed reverse osmosis claim.
• Arsenic: systems certified to NSF/ANSI 58, or to NSF/ANSI 53, for reduction of pentavalent arsenic. Read that wording closely. The listed claim covers arsenic in its pentavalent form, so ask the lab which form your well carries.
• PFOA and PFOS: systems certified to NSF/ANSI 53 for reduction of PFOA and PFOS. Some products also carry a total PFAS reduction claim. PFNA coverage varies by product, so ask the manufacturer whether a given product covers it.
• Volatile organic compounds: systems certified to NSF/ANSI 53 for VOC reduction, or for reduction of the specific compound found, such as benzene, trichloroethylene or tetrachloroethylene.
• Hardness: softeners certified to NSF/ANSI 44 for reduction of hardness.
• Chlorine, taste and odor: systems certified to NSF/ANSI 42 for aesthetic effects.

Three parameters deserve a plain warning, because the certification language does not line up neatly with them. NSF's own certified product listings do not currently show a uranium reduction claim under NSF/ANSI 53 or 58, and they do not show an iron or manganese reduction claim under NSF/ANSI 42 or 44. Equipment aimed at those parameters exists and is widely sold, but you cannot verify it the way you can verify a nitrate or PFOA claim. Ask the manufacturer for performance data on your specific parameter and concentration, get the answer in writing, and confirm the outcome with a post-installation lab test rather than a brochure.

Our companion guide on a failed PWTA test walks each parameter through to the equipment that addresses it, along with the closing-deadline pressure that comes with it. NJDEP also points homeowners toward State programs that may help with cost if specific eligibility requirements are met, including the NJ Spill Compensation Fund Damage Claims Program and the NJHMFA Potable Water Loan Program.

Whatever gets installed, retest afterward. Jersey Water Pros designs the system and licensed New Jersey master plumbers handle the installation. Ask us for a free quote before you negotiate a credit, so the number on the table reflects real equipment rather than a guess.

Test results carry expiration dates, and the two dates are different. Under N.J.A.C. 7:9E-3.3, analytical results other than coliform stay valid for one year from the date of sample collection. Coliform results stay valid for only six months. If a new source of water has been installed, prior results are no longer valid.

That split is the single most useful thing a listing agent can know. A seller holding an eleven-month-old test does not need a full retest. They need a fresh coliform sample.

Order the test early, at the start of attorney review rather than two weeks before closing. Several parameters can stretch turnaround without warning. A gross alpha result greater than 5 pCi/L requires a second count. A positive total coliform result adds an E. coli analysis. PFAS and VOCs require that field blank. Any one of those can push a report past a scheduled closing date.

Two more scheduling notes. More than one lab can be used, as long as each is certified by NJDEP for the parameters it analyzes, but N.J.A.C. 7:9E-3.1(b) requires that one lab coordinates and submits all the PWTA results to NJDEP electronically. And a buyer and seller are free to agree on a retest even when the existing results are still valid.

Nothing requires a well owner to test between transactions. NJDEP still publishes a recommended schedule from the New Jersey Department of Health:

• Every year, at least: total coliform, nitrates and pH.
• Every five years, at least: PFAS, lead, VOCs, SOCs, iron and manganese.
• At least once: arsenic, mercury, gross alpha and uranium. After the initial arsenic test, NJDEP says testing frequency recommendations are based on the known concentration.

NJDEP also lists moments worth testing regardless of the calendar: a change in the color, odor or taste of the water, whenever the well cap is removed, a flood or fire near the well, a chemical spill near the well, septic issues at your home or a neighbor's, or a neighbor with known water quality issues.

As NJDEP puts it, private well owners act as their own water company. Nobody mails you an annual report the way a utility does for homes on public water. If you want to know your numbers, use the NJDEP DataMiner list of certified laboratories and confirm the lab holds certification for the specific parameters you are ordering. We can help arrange that lab testing and walk through the results with you. If those results point to treatment, a free quote is the next step.