Well Water Testing in Glen Gardner, NJ

Wooded stream valley near Glen Gardner, Hunterdon County, NJ.

Glen Gardner sits on the western edge of Lebanon Township's historic footprint and was incorporated as its own borough in 1919 from portions of Lebanon and Bethlehem townships. Its name comes from the glen formed by Spruce Run and the Gardner family associated with the area. About 1,680 residents live in a compact 1.5 square miles, and the borough splits in the middle when it comes to water: roughly half of it sits inside a mapped public water service area, while the rest depends on wells. The wells that have been tested here share one striking trait.

What well tests in Glen Gardner have found

NJDEP's Private Well Testing Act summary (September 2002 to December 2024) covers 56 untreated wells in the borough. It is a modest sample, so counts appear alongside percentages.

pH: 62.5% of wells, 35 of 56, were outside the optimum range, more than double the county's 28.1%. This is the defining result.
Arsenic: none of 56 wells exceeded the limit, against 15.7% countywide.
Bacteria: total coliform in 19.6% (11 of 56); E. coli in none.
Iron and manganese: 7.1% and 5.4%, both below the county rates.
Nitrate: 1 of 56 wells exceeded the limit; no solvent (VOC) exceedances.
Radiological: 1 of 52 wells exceeded gross alpha, and none of 17 exceeded the uranium limit.

Too few wells have been tested for PFAS to publish a Glen Gardner figure.

What acidic water means for a house

A pH outside the optimum range, on the acidic side, is mostly a plumbing story. Soft, acidic groundwater tends to be corrosive, and USGS research links acidic, low-alkalinity groundwater to lead and copper leaching from household pipes and fixtures. The signs are often visible before any test: blue-green staining around sinks and tubs, pinhole leaks in copper pipes, or metallic taste. A neutralizing system is a common fix, and its presence, age and maintenance record are worth asking about at a sale. The PWTA sample is drawn from the untreated well, so a house with a working neutralizer can still show a low-pH result on the report.

The rock beneath Glen Gardner

The NJ Geological Survey's generalized map puts the whole borough, about 100%, on Precambrian gneiss and granite of the Highlands. That is the pattern behind both the acidity and the lack of arsenic: across the six Hunterdon towns almost entirely on Highlands rock, about 58% of tested wells fall outside the optimum pH range and 0.5% exceed the arsenic limit, while the Newark Basin towns to the south show roughly 17% and 22%.

Public water or a private well?

NJDEP's 2017 purveyor map shows the Glen Gardner water system covering about 47% of the borough, and a small part served from Hampton's system, roughly 55.1% in all. The remaining properties rely on private wells, and 56 tests since 2002 show wells are still changing hands. Because the split runs through the borough, the specific address matters more than the town name. A water bill from the borough is the quickest confirmation.

Buying or selling in Glen Gardner

For a well-served home, the acidity result is the one to prepare for.

Ask about corrosion. Blue-green staining, leak history and any neutralizer are worth a question to the seller.
Ask for the plumbing details. Copper pipes and older fixtures matter more when the water is acidic, since they are what the water reacts with.
Keep the rest of the panel in view. Arsenic is unlikely here, but bacteria and the required panel still apply.

Both parties must receive and review the results before closing. The law does not say who orders or pays, so that is negotiated. See the PWTA page and the treatment referral page.

Renting out a property in Glen Gardner

Rentals on a private well need a retest at least every five years, with a copy to each tenant within 30 days. For a landlord in a corrosive-water area, the retest is also a chance to check whether fixtures are being affected. Rentals on the borough system have no such requirement. Tests from before December 2021 have 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:

Lebanon Township: arsenic 0.6%, pH 54.4%, gross alpha 2.8% (1,084 wells)
Bethlehem Township: arsenic 0.4%, pH 64.9%, gross alpha 3.1% (690 wells)

Questions from Glen Gardner homeowners

Is acidic water safe to drink?

The acidity itself is not the health concern. The concern is what it can dissolve from your plumbing, which is why a low-pH result is often followed by a lead and copper check at the tap. Our report guide explains the lines.

Why is there no arsenic here?

Arsenic in this part of New Jersey is tied to red mudstone and siltstone in the Newark Basin, and Glen Gardner sits on different rock. Farther south, Delaware Township sees 21.7% of wells above the limit.

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. In a place where acidic water is the norm, the pH result is the one to track from year to year, because a change can signal that a neutralizer needs attention.

Do I need uranium testing?

Yes, for a well. It is part of the county panel; see why Hunterdon requires it.

Also nearby: Bethlehem Township and Lebanon Township.