Well water in South Brunswick township, New Jersey
In South Brunswick township, 29% of 96 private wells tested between 2002 and 2024 had total coliform above the New Jersey limit (any detection), according to NJDEP.
96 private wells tested 2002 to 2024 in state summaries; 19 individual samples from 13 wells, 1984 to 2024. 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 | Median | 95th pct | Highest | State level | |
|---|---|---|---|---|---|---|---|
| Iron | 96 | 45% | 300 ug/L | ||||
| Manganese | 96 | 40% | 50 ug/L | ||||
| Total coliform | 96 | 29% | |||||
| Gross alpha | 14 | 14% | 15 pCi/L | ||||
| Arsenic | 96 | 14% | 5 ug/L | ||||
| E. coli Fecal coliform or | 96 | 6% | |||||
| Nitrate | 96 | 2% | 10 mg/L | ||||
| Uranium | 10 | 0% | 30 ug/L |
What individual samples found
Each row summarizes every public sample for that contaminant inside South Brunswick 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.
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What this means
Among homeowners in South Brunswick township who sent a sample to the state lab, the health-based limits most often exceeded were total coliform (29% of 96 wells), arsenic (14% of 96 wells), and E. coli (6% of 96 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 South Brunswick township
- Volatile organic compounds (VOCs)1 hazardous waste site on record locally.
- Metals panel1 hazardous waste site on record locally.
- Iron45% of 96 local wells tested were above the New Jersey nuisance level.
- Manganese40% of 96 local wells tested were above the New Jersey nuisance level.
- Total coliform29% of 96 local wells tested were above the New Jersey limit (any detection).
- Gross alpha14% of 14 local wells tested were above the New Jersey limit.
- Arsenic14% of 96 local wells tested were above the New Jersey limit.
- E. coli6% of 96 local wells tested were above the New Jersey limit (any detection).
- Nitrate2% of 96 local wells tested were above the New Jersey limit.
- RadonMedian local reading is 160 pCi/L.
Contamination sources on record in South Brunswick township
NJDEP records 1 hazardous waste site in South Brunswick township, among 258 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.
- 1
- hazardous waste siteSolvents, degreasers and metals from industrial sites can travel far in fractured bedrock.
- 200
- registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
- 3
- lined landfills and transfer facilities
- 54
- 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
- Arsenic
- Point-of-use reverse osmosis; Adsorptive media (iron-based) whole-house; Anion exchange
- E. coli
- Shock chlorination and fix the well cap or casing; UV disinfection whole-house; Chlorination system
- Gross alpha
- Point-of-use reverse osmosis; Water softener (cation exchange) for radium; Anion exchange for uranium
- Iron
- Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
Get your South Brunswick township water tested at home
A licensed local water treatment company tests your tap water in your home, walks you through the numbers, and quotes treatment only if something needs fixing. Free, about 30 minutes, no obligation. Tell us what you need and we match you with a company that serves South Brunswick township.
Common questions
Is there arsenic in well water in South Brunswick township?
Arsenic was detected in 42% of 19 public well samples in South Brunswick 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 high is radon in well water in South Brunswick township?
The median radon level across 3 public samples in South Brunswick township was 160 pCi/L, with a high of 13,300 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in South Brunswick 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: 46 samples in South Brunswick 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 8 contaminants in South Brunswick township, up to 96 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: 258 regulated sites located in South Brunswick 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.