Perchlorate is a chemical linked to rocket fuel, fireworks, and certain fertilizers, and it has turned up in New Jersey groundwater near military and industrial sites for decades. It rarely comes up in a routine well test, which means most homeowners have never actually checked for it.

Where Perchlorate in NJ Water Actually Comes From

Perchlorate does not occur naturally in New Jersey groundwater in any meaningful amount. It gets there from manufacturing, munitions, and fireworks use, and New Jersey has a documented history with all three. Sites like Picatinny Arsenal in Morris County, where propellants and ammunition have been produced and tested for over a century, are the kind of location where perchlorate contamination has been found in nearby groundwater. It also shows up near other military installations and industrial sites across the state.

State testing has found perchlorate in public water systems in multiple New Jersey counties, not just near obvious military sites. Private wells downgradient from any of these sources carry the same risk, and there is no way to know without testing specifically for it.

New Jersey’s Standard, and Why There Is No Federal One

New Jersey has set a ground water quality standard for perchlorate at 5 parts per billion, and the DEP recommends against drinking or cooking with water above that level. That is a groundwater standard, not an enforceable drinking water limit. New Jersey proposed a formal drinking water standard in 2009, but the rule lapsed before it was finalized, and neither the state nor the EPA has adopted one since.

Perchlorate is a particular concern for pregnant women, infants, and anyone with thyroid problems, because it interferes with the thyroid’s ability to absorb iodine. Because there is no enforceable limit, water suppliers and well owners are not required to test for it or treat it, even where it has been found before.

Why Your Test Results Probably Don’t Include It

Perchlorate is not part of the standard panel most homeowners run when they test their well, and it is easy to assume a clean-looking test result means your water has been checked for everything. It generally has not. If your property is anywhere near a current or former military site, an industrial facility, or an area with a history of fireworks or munitions manufacturing, perchlorate is worth requesting as its own line item on your next test.

What Jersey Radon Tests For

Perchlorate is one of a growing list of contaminants that never make it onto a standard well test unless someone asks for them specifically. Our water testing service can add it to your panel, and our guide on what a water test actually shows covers which parameters are included by default and which ones you have to request. If PFAS is also a concern in your area, our breakdown of PFAS in New Jersey water covers that separately.

Contaminants like perchlorate are far from the only parameters a standard well test skips. Homes on bedrock wells in the state’s northern counties sometimes carry naturally occurring radioactivity that has nothing to do with industrial activity, while wells elsewhere can produce tea-colored water from organic matter breaking down in the soil. Both are easy to miss unless you specifically ask for them, which is the same blind spot that lets perchlorate go unnoticed.

If you live near a military site, industrial facility, or anywhere with a known history of contamination in your area, and you want to know what is actually in your water rather than what a standard test happens to catch, schedule a free estimate and we’ll build a testing panel that covers what your specific property is actually at risk for.