Well Water Testing in Kingwood Township, NJ

Kingwood Township sits on the Hunterdon Plateau, with elevation dropping from 300 to 500 feet inland to roughly 100 feet at the Delaware River. The township has Revolutionary War history too: Daniel Bray, who helped round up boats for Washington's crossing of the Delaware, lived here, and Route 29 is named in his honor. About 3,800 people live across nearly 36 square miles, and almost none of the township is on public water. Its well tests put it in a group of one: no other Hunterdon township shows arsenic, gross alpha and manganese all this far above the county norm.

What well tests in Kingwood Township have found

NJDEP's Private Well Testing Act summary (September 2002 to December 2024) covers 688 untreated wells in the township.

• Arsenic: 43% exceeded the 5 µg/L limit, about two and three-quarter times the county's 15.7%.
• Manganese: 27% exceeded the nuisance standard, the highest in Hunterdon and well above the county's 10.9%.
• Gross alpha: 13% of 617 wells exceeded the limit (county: 5.8%). Uranium itself was rare: 0.6% of 180.
• Iron: 22.6% exceeded the nuisance standard (county: 16%).
• pH: only 5.5% were outside the optimum range, far below the county's 28.1%.
• Bacteria: total coliform in 21.1% of wells; E. coli in 2.6%.
• Nitrate and solvents: 0.4% and 0%.
• PFAS: none of 96 wells tested since late 2021 exceeded a PFAS limit.

Kingwood's water is rarely acidic, rarely contaminated by nitrate, and clean on PFAS in the sample so far. Its issues are naturally occurring minerals.

The rock beneath Kingwood

The NJ Geological Survey's generalized map puts about 98% of the township on Triassic siltstone, shale, sandstone and conglomerate, the sedimentary rock of the Newark Basin. Research on the Newark Basin ties elevated arsenic to its red mudstone and siltstone, and USGS work on the Passaic Formation identifies uranium as its dominant alpha emitter. The Kingwood numbers show both effects. Uranium testing entered the panel later than the other parameters, so its sample is smaller and the gross alpha figure is the fuller guide to radiological results here.

Public water or a private well?

NJDEP's 2017 purveyor map shows essentially none of the township, about 0.1%, inside a mapped public water service area. Private wells serve nearly every home, and a PWTA test accompanies nearly every sale. Neighboring Frenchtown is the exception, with a public system covering most of the borough.

Buying or selling in Kingwood Township

The local record is unusually consistent, which helps planning.

1. Expect a mineral-heavy report. Arsenic, gross alpha and manganese are each flagged in a large minority of wells. A clean report is possible but not the default.
2. Get treatment quotes that address more than one issue. Arsenic and manganese frequently occur in the same well, and equipment for one does not always handle the other.
3. Do not assume clear water means a clean result. None of these is visible, and manganese is the only one that may show as staining.

Both parties must receive and review the results before closing, and the contract decides who pays. An elevated gross alpha result usually leads to more specific analysis to identify the cause. See PWTA testing and the treatment referral page.

Renting out a property in Kingwood Township

Landlords on private wells retest at least every five years and give each tenant a copy within 30 days of the result. In a township this rural, a rental often means a farmhouse or cottage on a family lot with its own well, which is exactly the kind of property the five-year rule catches. A test from before December 2021 carries no PFAS result. See landlord testing.

How this compares with neighboring towns

Percent of tested wells above the limit for arsenic and gross alpha, or outside the optimum pH range, with the number of wells behind each figure:

• Alexandria Township: arsenic 23.5%, pH 34.4%, gross alpha 1.5% (863 wells)
• Delaware Township: arsenic 21.7%, pH 24%, gross alpha 11.7% (700 wells)
• Frenchtown Borough: arsenic 67.4%, pH 4.3%, gross alpha 7% (46 wells)

Questions from Kingwood Township homeowners

What does a high gross alpha result mean?

Gross alpha is a broad screen for naturally occurring radioactivity, and it flags roughly one Kingwood well in eight. An elevated result usually leads the lab to more specific analysis to identify which element is responsible, and treatment exists for the common ones. The result is a starting point for a conversation, not a verdict on the house.

Is high manganese dangerous?

At the levels usually found it is mostly an aesthetic issue, with staining and a metallic taste. The report will show whether yours is far above the standard. See how to read your test report.

Why is my water not acidic when my neighbors in the north have acidic wells?

Different rock. The Highlands towns to the north are dominated by gneiss and see acidity and almost no arsenic; Kingwood sits on Newark Basin rock and sees the reverse. Our post on why wells differ covers it.

If I am not selling, how often should I test?

The New Jersey Department of Health encourages well owners to test every year for total coliform, nitrate and pH, and at least once for arsenic, mercury, gross alpha and uranium. With arsenic and gross alpha both well above the county rate here, a one-time test for those two is the most valuable an owner who has never tested can do.

Does the uranium requirement apply?

Yes. It is part of the county panel; see why Hunterdon requires it.

Also nearby: Alexandria Township and Delaware Township.