Well water in Raritan township, New Jersey
In Raritan township, 22% of 2,269 private wells tested between 2002 and 2024 had arsenic above the New Jersey limit (5 ug/L), according to NJDEP.
2,270 private wells tested 2002 to 2024 in state summaries; 4 individual samples from 4 wells, 1985 to 1998. 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 | |
|---|---|---|---|---|---|---|---|
| Arsenic | 2,269 | 22% | 5 ug/L | ||||
| Total coliform | 2,267 | 20% | |||||
| Manganese | 2,270 | 13% | 50 ug/L | ||||
| Gross alpha | 2,028 | 11% | 15 pCi/L | ||||
| Iron | 2,269 | 11% | 300 ug/L | ||||
| PFOA | 287 | 5% | 14 ng/L | ||||
| E. coli Fecal coliform or | 2,262 | 2% | |||||
| PFOS | 287 | 2% | 13 ng/L | ||||
| Nitrate | 2,270 | <1% | 10 mg/L | ||||
| PFNA | 287 | <1% | 13 ng/L | ||||
| Uranium | 545 | <1% | 30 ug/L |
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What this means
Among homeowners in Raritan township who sent a sample to the state lab, the health-based limits most often exceeded were arsenic (22% of 2,269 wells), total coliform (20% of 2,267 wells), and PFOA (5% of 287 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.
Manganese and iron 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 Raritan township
- Arsenic22% of 2,269 local wells tested were above the New Jersey limit.
- Total coliform20% of 2,267 local wells tested were above the New Jersey limit (any detection).
- Manganese13% of 2,270 local wells tested were above the New Jersey nuisance level.
- Gross alpha11% of 2,028 local wells tested were above the New Jersey limit.
- Iron11% of 2,269 local wells tested were above the New Jersey nuisance level.
- PFOA5% of 287 local wells tested were above the New Jersey limit.
- E. coli2% of 2,262 local wells tested were above the New Jersey limit (any detection).
- PFOS2% of 287 local wells tested were above the New Jersey limit.
Contamination sources on record in Raritan township
NJDEP records 126 regulated sites in Raritan township, among 126 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.
- 103
- registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
- 1
- lined landfill or transfer facility
- 22
- other remediation projects
Treatment that fits the local profile
- Arsenic
- Point-of-use reverse osmosis; Adsorptive media (iron-based) whole-house; Anion exchange
- Total coliform
- Inspect and repair the well cap and casing, then shock chlorinate and retest; UV disinfection whole-house; Chlorination system
- Gross alpha
- Point-of-use reverse osmosis; Water softener (cation exchange) for radium; Anion exchange for uranium
- Manganese
- Oxidizing filter (greensand, birm) whole-house; Water softener (low levels); Point-of-use reverse osmosis
- Iron
- Oxidizing filter whole-house; Water softener (low levels); Aeration plus filtration
Get your Raritan township water tested at home
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Common questions
Is there arsenic in well water in Raritan township?
Arsenic was detected in 100% of 4 public well samples in Raritan township, and 25% 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 Raritan 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: 8 samples in Raritan 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 11 contaminants in Raritan township, up to 2,270 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: 126 regulated sites located in Raritan 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.