In New Jersey, the Private Well Testing Act (PWTA) is a vital safeguard that ensures a baseline of water safety during real estate transactions. However, as our understanding of geology and industrial chemistry evolves, it is becoming clear that the “minimum” state requirement does not always tell the whole story.
Depending on your locations, there are several “optional” tests that—given the regional data—should arguably be treated as mandatory. From naturally occurring radioactive gases to modern synthetic byproducts, these hidden threats often slip through the cracks of standard state panels. For homeowners and buyers, knowing when to go beyond the state requirements is the difference between a house that is “up to code” and a home that is truly safe.
Radon in Water: The Invisible Gas in the Highlands
While New Jersey requires a radon air test for most home sales, Radon in Water remains an optional parameter. In the Highlands province—which includes large swaths of Hunterdon, Morris, Passaic, and Sussex counties—this is a significant oversight.
Radon is a radioactive gas that dissolves into groundwater from the surrounding bedrock. When you use your dishwasher, shower, or washing machine, that dissolved radon is released into your home’s air. While the primary risk of radon is inhalation, ingesting radon-rich water also poses a risk for stomach cancer.
According to the NJDEP, if your well is in a region with high uranium or gross alpha levels, testing for radon in water should be your next step. Because it requires a specialized “no-bubbles” sampling technique, it is often skipped during standard services, yet in Northern NJ, it is one of the most common hidden risks.
Radium-224 and Radium-228: Beyond Gross Alpha
In the southern half of the state, particularly in the Kirkwood-Cohansey aquifer system (covering Atlantic, Burlington, Camden, and Ocean counties), the concern shifts from uranium to radium.
The state mandates a Gross Alpha test, which acts as a “smoke detector” for radiation. If the gross alpha level is high, it suggests the presence of radium. However, gross alpha results can sometimes be misleadingly low if the sample isn’t analyzed within a 48-hour window, as certain isotopes like Radium-224 decay rapidly.
Buyers in South Jersey should consider requesting specific Radium-226 and Radium-228 tests as an add-on. As noted by the United States Geological Survey (USGS), these isotopes are widespread in the sandy soils of the coastal plain and can lead to long-term health issues if the standard “screening” test doesn’t capture the full picture.
1,4-Dioxane: The Emerging Industrial Threat
While the PWTA was updated in 2021 to include three major PFAS compounds, another emerging contaminant remains optional: 1,4-Dioxane. This synthetic chemical was historically used as a stabilizer for solvents and is now found in various consumer products like detergents and shampoos.
1,4-Dioxane is highly mobile in groundwater and does not break down easily. In New Jersey, it has been detected in several public and private wells near industrial sites or older landfills. Because it is classified as “likely to be carcinogenic,” many water experts believe it should be a standard requirement for wells in transit-heavy or historically industrial locations. If your target home is within a few miles of an industrial park, adding 1,4-Dioxane to your panel is a wise investment.
Secondary Parameters: More Than Just Aesthetics
The state categorizes Iron, Manganese, and pH as “Secondary Parameters,” meaning they are mostly considered aesthetic nuisances. However, in many counties, these “optional” nuisances act as catalysts for more serious problems.
- Low pH: In South Jersey, acidic water is the norm. While the state doesn’t “fail” a well for low pH, that acidity is what causes lead and copper to leach out of your pipes.
- Manganese: Recent studies have suggested that high levels of manganese can have neurotoxic effects, particularly in developing children.
We frequently emphasize on our blog that these secondary parameters should be treated with the same seriousness as primary ones, especially if you have an older home with legacy plumbing.
The Cost-Benefit of the “Full Suite”
Many homeowners hesitate to add optional tests because of the additional laboratory fees. However, compared to the cost of a mortgage or the potential price of medical bills, the investment is minimal.
At Olympian Well Water Testing, we often recommend a “Comprehensive Plus” package for certain counties. This ensures that:
- You aren’t surprised by an emerging contaminant two years after moving in.
- Your maintenance plan is tailored to the actual chemistry of your water, not just the state-required minimums.
- You have the data needed to negotiate a better price if specialized filtration (like an air-stripper for radon) is required.
Summary of Recommended Optional Tests by Region
| Region | Primary Rock Type | Recommended “Optional” Tests |
| Northern NJ (Highlands) | Granite/Gneiss | Radon in Water, Uranium, Gross Alpha (48-hr) |
| Central NJ (Piedmont) | Shale/Sandstone | Arsenic (Speciation), 1,4-Dioxane |
| Southern NJ (Coastal Plain) | Sand/Silt | Radium-224, Radium-228, Mercury |
Conclusion: Your Health, Your Choice
The state of New Jersey does an excellent job of protecting well owners through the PWTA, but the law is a baseline, not a ceiling. As we move through 2026, the complexity of our groundwater continues to increase.
By choosing to include “optional” tests based on your specific county’s history and geology, you are taking proactive ownership of your family’s health. Don’t let a “passing” state report give you a false sense of security if there are known regional threats lurking just outside the state’s current mandate.
