If you bought or sold a property in New Jersey with a private well, you probably encountered water testing as part of the transaction. What you may not know is exactly what the law required, what it left out, and what it means for the ongoing safety of the water in your well.

New Jersey has one of the more robust legal frameworks for private well testing in the country. It still has significant gaps that leave most well-water households less protected than they may assume.

What the Private Well Testing Act Actually Requires

New Jersey’s Private Well Testing Act, commonly called the PWTA, was enacted in 2002 and took effect in 2002. It requires that private well water be tested at the time of real estate transfer for a specific panel of contaminants. The test must be conducted before closing, the results must be shared with the buyer, and the test must be performed by a certified laboratory.

The required PWTA test panel includes coliform bacteria, nitrates, pH, lead, arsenic, volatile organic compounds, and several other parameters established by the New Jersey Department of Environmental Protection. County health departments in New Jersey may require additional parameters beyond the state minimum, and some counties have added contaminants to the panel based on local groundwater conditions.

The test results must be provided to both the buyer and the seller before closing. If results show contamination above the action level for any regulated parameter, that information becomes part of the real estate transaction and must be addressed or disclosed.

Who the Act Covers and Who It Doesn’t

The PWTA applies specifically to real estate transactions involving properties with private wells. It requires testing when a property changes hands. That is its scope, and that scope is considerably narrower than it might appear at first.

The Act does not require ongoing testing for existing homeowners who are not selling. A family that has lived on the same property with the same private well for fifteen years has no legal obligation under the PWTA to test the water during that time. Whatever results were obtained at the time of purchase are the last official record of the water’s quality, even as groundwater conditions, land use, and the well’s physical condition continue to change over the years.

It also does not apply to rental properties in the same way, and its enforcement mechanism is tied to the closing process rather than to any ongoing regulatory monitoring. Once the transaction is complete, the legal requirement has been fulfilled regardless of what happens to the water quality afterward.

What the Required Test Panel Misses

The PWTA panel covers a meaningful set of contaminants, but it was established before some of the most significant water quality concerns of the past decade were fully understood at the regulatory level.

PFAS are not part of the standard PWTA test panel. New Jersey has been among the most aggressive states in establishing PFAS drinking water standards, and the contaminants have been detected in groundwater across multiple counties. Yet a property that changes hands and satisfies the full PWTA testing requirement may have never had the water tested for PFAS at all.

Radon in water is not part of the standard PWTA panel. Arsenic is included, but at a testing requirement tied to the EPA standard of 10 parts per billion. Manganese, which can cause neurological effects at elevated concentrations and is common in NJ groundwater, was not included in the original panel and has only been added in some counties. The standard panel provides a useful baseline, but it is not a comprehensive picture of what may be present.

Why Annual Testing Is the Responsible Standard

The EPA recommends that private well owners test their water annually, not just at the time of purchase. Groundwater chemistry changes. A well that tested clean at closing may develop bacterial contamination after a nearby septic failure. Arsenic levels can rise as the well ages and the surrounding geology is disturbed. PFAS plumes in groundwater migrate over time, reaching wells that were unaffected when the property was last tested.

None of these changes produce a visible sign at the tap. The water may look and taste exactly as it did at closing while the underlying chemistry has shifted in ways that matter to the household’s health.

Annual testing for coliform bacteria and nitrates at minimum is the standard most well water authorities recommend. A more comprehensive panel every few years, or any time water quality changes or a nearby land use event occurs, provides a more complete picture.

What a Responsible Well Testing Program Looks Like

Beyond the legal requirement, a thoughtful approach to private well water safety in New Jersey includes:

• Annual testing for coliform bacteria, nitrates, and any locally elevated contaminants
• PFAS testing, particularly for properties in counties with known groundwater contamination
• Follow-up testing after any flooding, well repair, nearby construction, or change in water quality
• A comprehensive panel every two to three years that covers the full range of contaminants relevant to the local geology and land use
• Testing after any changes to the treatment system to confirm the new equipment is performing as expected

Professional water testing takes the guesswork out of this process and provides results that directly inform treatment decisions rather than just satisfying a legal checkbox.

How Jersey Radon Helps Private Well Owners Go Beyond the Minimum

Jersey Radon provides water testing and treatment services for residential properties on private wells throughout New Jersey. We work with homeowners who want to understand what’s in the water, not just what the law requires them to check.

We help well owners who want to:

• Test for contaminants not included in the standard PWTA panel, including PFAS
• Establish an annual testing baseline beyond the required real estate closing test
• Understand what local geology and land use mean for their specific well
• Match treatment equipment to confirmed contaminants rather than assumptions

If you want to go beyond what the law requires and get a complete picture of your private well water quality, contact Jersey Radon for a free estimate. We’ll help you build a testing approach that reflects what’s actually at risk in your area.