Well water in Mount Laurel township, New Jersey

In Mount Laurel township, 13% of 216 private wells tested between 2002 and 2024 had total coliform above the New Jersey limit (any detection), according to NJDEP.

217 private wells tested 2002 to 2024 in state summaries; 13 individual samples from 7 wells, 1982 to 2023. Data refreshed September 9, 2026.

What homeowner tests found

NJDEP Private Well Testing Act summaries: private wells tested and reported to the state, 2002 to 2024. Shares are against the level the state applies to each contaminant, named in the last column; several are stricter than EPA.

Contaminant	Wells tested	Above state level	State level
Iron	217	70%	300 ug/L
Manganese	217	24%	50 ug/L
Total coliform	216	13%
PFOA	29	7%	14 ng/L
Gross alpha	209	4%	15 pCi/L
Arsenic	77	4%	5 ug/L
E. coli Fecal coliform or	216	2%
Nitrate	217	<1%	10 mg/L
PFNA	29	0%	13 ng/L
PFOS	29	0%	13 ng/L

What individual samples found

Each row summarizes every public sample for that contaminant inside Mount Laurel township. Above limit means above the EPA maximum contaminant level; where EPA has no enforceable limit, the row shows a health guideline or nuisance level instead.

Contaminant	Samples	Detected	Above limit		Median	Highest	Limit
Arsenic 1982 to 2023	13	38%	0%		0	2.2	10 ug/L EPA limit

Sampled fewer than 10 times, too few to summarize: PFOA (2), PFOS (2), Nitrate (2).

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What this means

Among homeowners in Mount Laurel township who sent a sample to the state lab, the health-based limits most often exceeded were total coliform (13% of 216 wells), PFOA (7% of 29 wells), and arsenic (4% of 77 wells). These are ordinary wells tested by their owners, so the shares are the best available picture of a typical well here, with one caveat: people test more often when they suspect a problem.

Iron and manganese exceed the state's advisory level in a sizable share of wells; these are mostly a taste, staining or diet issue rather than a toxicity one.

What to test for in Mount Laurel township

Iron70% of 217 local wells tested were above the New Jersey nuisance level.
Manganese24% of 217 local wells tested were above the New Jersey nuisance level.
Total coliform13% of 216 local wells tested were above the New Jersey limit (any detection).
PFOA7% of 29 local wells tested were above the New Jersey limit.
Gross alpha4% of 209 local wells tested were above the New Jersey limit.
Arsenic4% of 77 local wells tested were above the New Jersey limit.
E. coli2% of 216 local wells tested were above the New Jersey limit (any detection).
Nitrate<1% of 217 local wells tested were above the New Jersey limit.

Contamination sources on record in Mount Laurel township

NJDEP records 168 regulated sites in Mount Laurel township, among 168 regulated sites in total. Groundwater does not follow property lines, so a well within a few hundred feet of one of these is worth testing for what that site could release.

130: registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
38: other remediation projects

Treatment that fits the local profile

Total coliform: Inspect and repair the well cap and casing, then shock chlorinate and retest; UV disinfection whole-house; Chlorination system
PFOA: Granular activated carbon whole-house; Point-of-use reverse osmosis; Anion exchange
Iron: Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
Manganese: Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis

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Common questions

Is there arsenic in well water in Mount Laurel township?

Arsenic was detected in 38% of 13 public well samples in Mount Laurel township, and 0% were above the EPA limit of 10 ug/L. Arsenic has no taste or smell; a lab test is the only way to know your level.

How often should I test a private well in Mount Laurel township?

Test for bacteria and nitrate every year. Test once for arsenic, uranium, radon, fluoride, manganese and PFAS, then again every three to five years or after any change in taste, color, or plumbing.

Sources

USGS Water Quality Portal: 19 samples in Mount Laurel township. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
NJDEP Private Well Testing Act summaries: summaries for 10 contaminants in Mount Laurel township, up to 217 wells each. Share of private wells exceeding each standard in tests required at sale or lease under the New Jersey Private Well Testing Act, September 2002 to December 2024, published by NJDEP. Tests are untreated water at the time of sale or lease, so every well is counted once per transaction. Municipalities with fewer than ten wells are suppressed. Standards are New Jersey's: arsenic 5 ug/L, PFOA 14 ng/L, PFOS 13 ng/L, PFNA 13 ng/L, manganese and iron secondary standards. Uranium and PFAS were added to the required panel in 2021 and 2020, so their well counts are smaller. Retrieved September 9, 2026.
NJDEP regulated sites: 168 regulated sites located in Mount Laurel township. Known Contaminated Sites, regulated underground storage tank facilities and solid waste landfills from the New Jersey Department of Environmental Protection (NJ-GeoWeb). Retrieved September 9, 2026.

Non-detects count as samples and are treated as zero when computing medians. Exactly at the limit counts as not above it. A sample belongs to the town containing the well's reported coordinates.