Well water in Stillwater township, New Jersey
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Testing strongly recommended
private wells tested between 2002 and 2024 in Stillwater township had total coliform above the New Jersey limit (any detection), according to NJDEP.
627 private wells tested 2002 to 2024 in state summaries; 105 test results across 11 contaminants from at least 14 wells, 1993 to 2022; radium (226 + 228) has the most at 15. Data refreshed September 9, 2026.
Compiled by Nick at Well Water Nerd from public records. How these pages are built
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.
What individual samples found
Each row summarizes every public sample for that contaminant inside Stillwater 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 | Above limit | Samples | Detected | Median | Highest | Limit |
|---|---|---|---|---|---|---|
| Radium (226 + 228) 2004 to 2022 | 15 | 100% | 0.205 | 2.7 | 5 pCi/L EPA limit | |
| Nitrate 1993 to 2022 | 14 | 57% | 0.125 | 7.5 | 10 mg/L EPA limit | |
| Uranium 2004 to 2022 | 13 | 100% | 0.411 | 2.64 | 30 ug/L EPA limit | |
| Sodium 1993 to 2022 | no limit | 14 | 100% | 17.6 | 97.1 | 20 mg/L health guideline |
| Manganese 1993 to 2022 | no limit | 14 | 79% | 21.9 | 145 | 300 ug/L health guideline |
| Iron 1993 to 2022 | no limit | 14 | 86% | 17.1 | 1,540 | 300 ug/L nuisance level |
| Radon 2004 | no limit | 12 | 100% | 985 | 2,080 | 2,000 pCi/L health guideline |
Sampled fewer than 10 times, too few to summarize: PFOA (1), PFOS (1), Arsenic (4), Lead (3).
Closer than the town
See the sampled wells near your address
The same records, drawn around one point: which wells within a few miles were sampled and what they found, how deep the wells next to you were drilled, and any leaking tank or cleanup site within a mile.
Check my addressWhat this means
Among homeowners in Stillwater township who sent a sample to the state lab, the health-based limits most often exceeded were total coliform (31% of 627 wells), E. coli (4% of 620 wells), and PFOS (3% of 108 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 Stillwater township
- 1Total coliform31% of 627 local wells tested were above the New Jersey limit (any detection).
- 2E. coli4% of 620 local wells tested were above the New Jersey limit (any detection).
- 3PFOS3% of 108 local wells tested were above the New Jersey limit.
- 4Arsenic2% of 479 local wells tested were above the New Jersey limit.
- 5PFOA<1% of 108 local wells tested were above the New Jersey limit.
- 6Nitrate<1% of 627 local wells tested were above the New Jersey limit.
- 7Gross alpha4% of 221 local wells tested were above the New Jersey limit.
- 8RadonMedian local reading is 985 pCi/L.
Test your Stillwater township well for total coliform, E. coli and PFOS
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
Just want bacteria checked first? Tap Score coliform and E. coli test, $99. Coliform and E. coli are the tests every well needs every year.
Want a quick look before paying for a lab? Home well water test strips on Amazon check hardness, iron, pH and nitrate in minutes. They are a screen, not a result: arsenic, bacteria, uranium and PFAS need a certified lab.
Affiliate links: the merchant pays us a commission and the price is the same for you. It does not change what the data above says. As an Amazon Associate we earn from qualifying purchases.
Where to get a well tested in New Jersey: certified labs, state programs and prices.
Already have results back? Get your lab report read against the Stillwater township numbers, $29. Every line explained, ranked by what matters, with the fix for each.
The rock under Stillwater township
Valley and Ridge aquifers
Sandstone and carbonate-rock. Layered sandstone and limestone means a well may draw from either. Hardness and iron are routine, and the limestone layers can carry bacteria and nitrate from the surface quickly, so test for both yearly.
Classification from the USGS Principal Aquifers of the United States (national map, 2003 edition, GIS release 2015), read at the town centroid. A single well can sit in a different unit, especially near a boundary.
Official help in New Jersey
Two places to start that are not selling anything: the state program that answers private well questions, and its list of labs certified to run drinking water tests. A certified lab is the difference between a result you can act on and a number.
- Private Wells, NJDEP
- Certified Laboratories, NJDEP
Contamination sources on record in Stillwater township
NJDEP records 20 regulated sites in Stillwater township, among 20 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.
- 17
- registered underground storage tank sitesRegistered tanks are regulated and inspected; they matter most when they are old or near a shallow well.
- 3
- 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
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
Systems we would look at first
Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.
For total coliform
Aquasana Rhino Well Water with UV
whole-house, at the point of entry, about $2,871
Whole-house system built for wells: sediment pre-filter, KDF and carbon, and a UV lamp rated to kill 99.99% of bacteria and viruses. It does not remove arsenic, nitrate, uranium or radon.
For manganese
Iron and manganese oxidizing filter
whole-house, at the point of entry, about $1,800
Air-injection or greensand media; fixes staining at the source.
Free, no obligation
Get on the list for a free in-home water test in Stillwater township
No water treatment company serves Stillwater township through Well Water Nerd yet. We are signing licensed companies on county by county: they test at your tap for free, walk you through the numbers, and quote treatment only if something needs fixing. Leave your details and you are first in line. Nothing is shared until a company joins for Stillwater township, and you get an email naming it first.
Common questions
How high is radon in well water in Stillwater township?
The median radon level across 12 public samples in Stillwater township was 985 pCi/L, with a high of 2,080 pCi/L. New Hampshire recommends treatment above 2,000 pCi/L.
How often should I test a private well in Stillwater 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.
Towns near Stillwater township
Closest first. Groundwater does not stop at a line on a map, so the next town over is a fair second opinion.
Want the numbers themselves? Download the New Jersey dataset as CSV, every county and town, with the sources named.
Sources
- USGS Water Quality Portal: 105 samples in Stillwater 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 Stillwater township, up to 627 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: 20 regulated sites located in Stillwater 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.