Well Water Testing in Readington Township, NJ

Hiker standing on a rocky ridge above autumn-colored forested hills.

Readington Township covers nearly 11% of Hunterdon County's total land area, making it the largest township in the county, and traces back to a 1730 royal charter, one of the oldest municipal boundaries in the region. Around 16,100 people live across almost 48 square miles, including the Whitehouse and Whitehouse Station sections. Its well record is the second largest in the county, 2,067 tests since 2002, and it stands out for what is low and what is unexpectedly high. Iron and manganese are the lowest among Hunterdon's townships, and solvents show up more often than in any other township.

What well tests in Readington Township have found

NJDEP's Private Well Testing Act summary (September 2002 to December 2024) covers 2,067 untreated wells.

Arsenic: 19.1% exceeded the limit (county: 15.7%).
Solvents (VOCs): 1.9% of wells exceeded a solvent limit, nearly four times the county's 0.5%. That is still under two percent, but it is the highest of any Hunterdon township.
Iron and manganese: 6.6% and 4%, the lowest rates among Hunterdon's larger townships.
pH: 11.2% outside the optimum range (county: 28.1%).
Bacteria: total coliform in 25%; E. coli in 4.8%.
Radiological: gross alpha in 1.6% of 1,882 wells; uranium in 0.2% of 565.
PFAS: 4.3% of 304 wells tested since late 2021 (county: 4.4%).
Nitrate: 0.5%.

What a solvent result means

The PWTA panel screens for a list of volatile organic compounds, industrial and commercial solvents and fuel components, that come from human activity and not the rock. A result above the limit is not common in Hunterdon, and it is a different kind of finding from arsenic or iron, because it points to a source such as a spill, a leaking tank or past commercial use. If one appears, the response involves identifying the compound and its likely source and often involves an environmental professional. In a township this large, a VOC exceedance in roughly one well in fifty is worth respecting without being alarmed by it.

The rock beneath Readington

The NJ Geological Survey's generalized map puts about 97% of the township on Triassic sedimentary rock of the Newark Basin. The township's arsenic rate is near the roughly 22% average for that rock, while its gross alpha rate is unusually low, and iron and manganese sit well below the county norms. Rock type sets a range, and Readington falls at a mild end of it. See why wells differ.

Public water or a private well?

NJDEP's 2017 purveyor map shows about 42.7% of the township inside the mapped service area of NJ American Water's Raritan system. That is far more than in most townships, and it does not tell you which homes are connected: 2,067 well tests since 2002 show wells are still very common, particularly outside the mapped area. Check the specific address, using a recent water bill or the signs of a well.

Buying or selling in Readington Township

The local pattern is a comparatively easy one, with a caveat.

Arsenic is the likeliest flag. About one well in five is affected. Ask early about treatment quotes if it is.
Iron and manganese are less of a factor. Staining complaints are less common than elsewhere.
Do not skip the solvent line. It is rarely flagged, and if it is, the follow-up takes longer than for a mineral result.

Both parties must receive and review the results before closing, and the contract decides who pays. See PWTA testing and the treatment referral page.

Renting out a property in Readington Township

Landlords on private wells retest at least every five years, with a written copy to each tenant within 30 days of the results. Rental cottages and second dwellings on a farm or large lot are one of the ways a well ends up under the five-year rule. 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:

Raritan Township: arsenic 22.2%, pH 7.2%, gross alpha 11.2% (2,269 wells)
Tewksbury Township: arsenic 1.8%, pH 52.8%, gross alpha 2.5% (1,024 wells)
Clinton Township: arsenic 3.6%, pH 40.3%, gross alpha 7.7% (928 wells)

Questions from Readington homeowners

Why is Readington's iron so low compared with the Highlands?

Different rock and different chemistry. The Highlands crystalline-rock towns see iron in about a quarter of wells; Readington sees it in about one in fifteen. Rock sets the range.

What should I do about a solvent result?

Ask the lab to identify the compound, confirm the result with a retest, and consider a consultation with an environmental professional. Our report guide explains the terms.

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. An annual coliform test is the most practical habit, and a one-time arsenic test is the most useful single addition for an owner who has never tested.

What about PFAS?

PFAS joined the required panel in December 2021, so its record is shorter, but 4.3% of 304 Readington wells exceeded a PFAS limit, essentially matching the county's 4.4%. A wider screen than the three required compounds is available; see PFAS testing.

Does the uranium requirement apply?

Yes, for a well. Locally 0.2% of 565 wells exceeded the limit. See why Hunterdon requires it.