Princeton Township Has a Lot of Private Wells. New Jersey Law Has a Lot to Say About Testing Them Before Closing.
Princeton Township’s residential landscape includes a substantial number of homes on private wells drawing from the Potomac-Raritan-Magothy aquifer system — and for every one of those properties, New Jersey’s Private Well Testing Act (PWTA) applies before the transaction can close. Understanding what the law requires, what Mercer County’s specific contaminant concerns add to the picture, and when Borough buyers on municipal water should test voluntarily is essential preparation for anyone in the Princeton real estate market. Our professional water testing services serve buyers, sellers, and agents throughout the Princeton area.
What the Private Well Testing Act Requires
New Jersey’s PWTA has required well water testing before residential real estate closings since 2002. The law applies to any property whose drinking water is supplied by a private well. The sale cannot legally close until both buyer and seller have received and reviewed the test results. The seller is generally responsible for arranging and paying for testing, though costs can be negotiated. What cannot be negotiated is the disclosure — results must be shared before closing regardless of what they show.
The PWTA sets a minimum contaminant panel. Buyers and sellers can agree to test for additional parameters beyond that floor — and in Mercer County, where the PRM aquifer has documented PFAS contamination from historical industrial and military sources, testing beyond the minimum is frequently a sound decision.
What Gets Tested
- Bacteria and total coliform — the fundamental water safety indicator
- Nitrates and nitrites — relevant near agricultural areas of Mercer County and older septic systems
- Volatile organic compounds (VOCs) — chemical contamination indicators
- Arsenic, lead, and other inorganic contaminants
- pH and gross alpha radioactivity
- PFAS — increasingly standard given documented PRM aquifer contamination in Mercer County
Princeton Borough Municipal Water vs. Township Private Wells
| Water Source | Testing Requirement | Recommendation |
|---|---|---|
| Princeton Township private well | Required by NJ law before closing | Test; include PFAS and Mercer County-specific parameters |
| Princeton Borough municipal water | Not required by law | Recommended for older homes — lead and PFAS concerns |
| Property with unknown water source | Confirm before closing; may be required | Clarify with seller and municipality early in transaction |
The distinction between Borough and Township matters significantly for PWTA purposes. Borough residents are almost entirely on New Jersey American Water’s municipal supply — the PWTA doesn’t apply. Township residents frequently draw from private wells. Buyers working on properties that span or border both jurisdictions should clarify the water source early in the transaction.
Why Princeton Borough Buyers Should Consider Voluntary Testing
The utility’s annual water quality report describes conditions at the treatment plant — not at the faucet in a specific older home. Princeton has a meaningful inventory of pre-1986 properties with lead solder at interior pipe joints. PFAS has been documented in the PRM aquifer and in portions of the regional water supply. A pre-closing water test at the tap addresses what the utility report doesn’t — and gives a buyer documented, property-specific information before transfer.
What Happens When Testing Reveals a Problem
PWTA test results showing contaminants above action levels must be disclosed. Common negotiated outcomes include seller-installed treatment before closing, price adjustments, or escrow arrangements. In Princeton transactions, PFAS and arsenic are the contaminants most likely to require negotiation — both can be addressed with treatment systems, and understanding treatment costs before entering negotiation is as important as understanding the results. Our Princeton water testing page covers the local contaminant picture in more detail. Our full New Jersey service area covers communities statewide.
Frequently Asked Questions — Water Testing Laws for Home Buyers in Princeton, NJ
Is water testing legally required when buying a Princeton Township home?
Yes, if the property has a private well — which is common in the Township. The PWTA requires testing and disclosure before closing. Princeton Borough homes on municipal water are not subject to the PWTA requirement, though voluntary testing is strongly recommended.
Should PFAS be included in a Princeton well water test?
Yes. PFAS has been documented in portions of the PRM aquifer that supplies Princeton Township’s private wells. It’s an increasingly standard addition to comprehensive pre-closing panels in Mercer County. Buyers should confirm PFAS is explicitly included in their testing panel.
Who pays for PWTA testing?
The seller is generally responsible, though costs can be negotiated. The disclosure obligation — both parties receiving and reviewing results before closing — is not negotiable regardless of cost allocation.
What if the test reveals arsenic or PFAS above the action level?
Results must be disclosed and the parties negotiate resolution. Common approaches include seller-installed treatment, price adjustments, or escrow arrangements. Treatment systems for both arsenic and PFAS are available and effective — their cost becomes part of the transaction calculation.
How much time should I allow for testing before closing?
Schedule as early as possible — ideally when the home inspection is arranged. Results return in one to two weeks. If follow-up testing or negotiation is needed, having adequate time built in prevents closing delays.
Get Princeton Water Testing Arranged Before Closing
Whether you’re a Township seller arranging required well water testing or a Borough buyer choosing voluntary tap testing — we can help you get the right panel and understand what the results mean. We serve Princeton and all of Mercer County. Call us at (732) 357-1988 or reach out online.
