The NJ Private Well Testing Act: Water Testing Before a Sale

The short answer: New Jersey's Private Well Testing Act (PWTA) is a consumer-information law. When a home's drinking water comes from a private well (or a small well that is not a public water system), the sale contract must require water testing, and closing cannot happen until both the buyer and the seller have received and reviewed the results and certified that review in writing (N.J.S.A. 58:12A-27). The Act does not by itself order a price cut or force the seller to install treatment—those outcomes come from negotiation and the contract.

This page is for agents and students who need the closing-practice version of the rule. For the broader seller-disclosure picture, start with NJ seller disclosure requirements.

This article summarizes statutes and DEP rules. It is not legal, medical or environmental advice. Parties with a failed well test should talk to a New Jersey attorney and a qualified treatment professional.

Which properties need a PWTA test before closing?

Testing is required on a contract of sale when the property's potable water supply is (N.J.S.A. 58:12A-27(a)):

1. A private well located on the property, or
2. A well that has fewer than 15 service connections or that does not regularly serve an average of at least 25 individuals daily at least 60 days out of the year

In plain language: if people drink from a private or small well on or serving the property, expect PWTA testing. The NJDEP PWTA program page notes that wells used only for non-drinking purposes (for example, lawn irrigation) are outside the Act. Public-community water customers are not under this private-well sale rule.

What must the contract and closing paperwork say?

Two hard stops appear in the statute:

Flag the PWTA clause early so lab work is not scrambling the week of closing. Our contract-to-closing checklist is a useful timeline companion.

Who can run the test, and what gets tested?

Only a laboratory certified by DEP for drinking-water contaminants may perform the test (N.J.S.A. 58:12A-30(a)). Results go to the requesting party on DEP's standardized private-well reporting form, which must show applicable standards and point readers to remediation-funding information (58:12A-30(b)).

Within five business days after completing the test, the lab must also submit the results to DEP with location, sampler, collection and analysis details (58:12A-30(c)).

The statute's baseline parameter list includes bacteria (total coliform), nitrates, iron, manganese, pH, regulated volatile organic compounds, lead, and—when DEP finds enough certified labs—a short-term 48-hour gross alpha screen for radium (N.J.S.A. 58:12A-28). DEP's implementing rules at N.J.A.C. 7:9E expand and update that list (including arsenic, certain synthetic organics and PFAS compounds) and allow geographic or geologic adjustments under N.J.S.A. 58:12A-29. Confirm the current parameter set with a certified lab and the DEP PWTA page before ordering.

How long do prior results stay valid?

DEP's sale-validity rule is parameter-specific (N.J.A.C. 7:9E-3.3):

• Most analytical results remain valid for one year from the sample-collection date
• Coliform (total and fecal) results remain valid for six months
• If a new water source has been installed, prior results are no longer valid

Buyers and sellers may still agree to retest even inside those windows (N.J.S.A. 58:12A-29(d)).

What if the well fails a standard?

A failed result must be reviewed. It does not automatically void the contract. Typical next steps (handled with attorneys and specialists, not by a salesperson guessing on treatment):

• Confirm the lab used a certified method and the standardized form
• Discuss remediation, credits, escrow holdbacks or walk-away rights under the contract
• Expect DEP to notify the county health authority within five business days of a reported failure; the county may issue a general notice to nearby well owners without naming the specific address (N.J.S.A. 58:12A-31)

Individual address-level results held by DEP or local health agencies are confidential and not open for public inspection, though de-identified compilations by municipality may be published (58:12A-31(b)).

Do landlords have PWTA duties too?

Yes. At least once every five years, the lessor of property whose potable supply is a private well (and not already tested under another State law) must test for the Act's parameters and, within 30 days of receiving results, give a written copy to each rental unit. New lessees get a written copy of the most recent results; seasonal rentals may post results inside the unit instead (N.J.S.A. 58:12A-32).

What should a new NJ agent actually do?

1. Ask early: "Is drinking water from a private or small well?"
2. Make sure the sale contract carries the required testing condition
3. Use a DEP-certified lab and keep the standardized report in the file
4. Do not schedule a closing until both sides have the results and are prepared to sign the review certification
5. Recommend counsel when results are disputed or remediation terms get complex (N.J.A.C. 11:5-6.4(i))

PWTA also shows up in disclosure study. See disclosures on the NJ exam and the seller disclosure guide.

Environmental and disclosure rules are part of NJ pre-licensing. Business Elementary's 75-hour pre-licensing course covers the licensing framework behind them.

Sources

• N.J.S.A. 58:12A-26 to 58:12A-32 (Justia): https://law.justia.com/codes/new-jersey/title-58/section-58-12a-26/ (and linked sections)
• NJDEP Private Well Testing Act program page: https://dep.nj.gov/privatewells/pwta/
• N.J.A.C. 7:9E (DEP courtesy PDF, updated 5-31-2020): https://dep.nj.gov/wp-content/uploads/rules/rules/njac7_9e.pdf
• N.J.A.C. 11:5-6.4 (Cornell LII): https://www.law.cornell.edu/regulations/new-jersey/N-J-A-C-11-5-6-4

Last reviewed: November 6, 2026