Well water in Greenwich township, New Jersey
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Testing recommended
tested well samples in Greenwich township exceeded the EPA limit for arsenic (10 ug/L), based on public data from USGS Water Quality Portal.
The strongest signal is total coliform: 17% of 12 local wells tested were above the New Jersey limit (any detection), too few samples to carry the headline but first on the test list below.
12 private wells tested 2002 to 2024 in state summaries; 545 test results across 12 contaminants from at least 44 wells, 1949 to 2022; sodium has the most at 114. 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.
| Contaminant | Above state level | Wells tested | Median | 95th pct | Highest | State level |
|---|---|---|---|---|---|---|
| Iron | 12 | 300 ug/L | ||||
| Manganese | 12 | 50 ug/L | ||||
| Total coliform | 12 | |||||
| E. coli Fecal coliform or | 12 | |||||
| Nitrate | 12 | 10 mg/L | ||||
| Gross alpha | 11 | 15 pCi/L |
What individual samples found
Each row summarizes every public sample for that contaminant inside Greenwich 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 |
|---|---|---|---|---|---|---|
| Arsenic 1975 to 2022 | 68 | 49% | 0 | 20 | 10 ug/L EPA limit | |
| Lead 1970 to 2006 | 57 | 25% | 0 | 60 | 15 ug/L EPA limit | |
| Nitrate 1975 to 2006 | 69 | 65% | 0.46 | 18 | 10 mg/L EPA limit | |
| Sodium 1951 to 2022 | no limit | 114 | 100% | 65.9 | 600 | 20 mg/L health guideline |
| Iron 1949 to 2022 | no limit | 111 | 100% | 4,100 | 270,000 | 300 ug/L nuisance level |
| Manganese 1949 to 2022 | no limit | 108 | 100% | 205 | 18,200 | 300 ug/L health guideline |
Sampled fewer than 10 times, too few to summarize: Radium (226 + 228) (5), Uranium (3), Copper (2), Fluoride (1), Radon (6), Chloride (1).
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 Greenwich township who sent a sample to the state lab, the health-based limits most often exceeded were total coliform (17% of 12 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 Greenwich township
- 1Total coliform17% of 12 local wells tested were above the New Jersey limit (any detection).
- 2Arsenic7% of 68 local samples were above the limit.
- 3Lead7% of 57 local samples were above the limit.
- 4Nitrate4% of 69 local samples were above the limit.
- 5Coliform bacteriaRecommended for every private well, every year.
- 6Iron67% of 12 local wells tested were above the New Jersey nuisance level.
- 7Manganese67% of 12 local wells tested were above the New Jersey nuisance level.
- 8RadonMedian local reading is 111 pCi/L.
- 9Volatile organic compounds (VOCs)1 hazardous waste site on record locally.
- 10Metals panel1 hazardous waste site on record locally.
Test your Greenwich township well for total coliform, arsenic and lead
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 Greenwich township numbers, $29. Every line explained, ranked by what matters, with the fix for each.
The rock under Greenwich township
Northern Atlantic Coastal Plain aquifer system
Semiconsolidated sand. Coastal plain sands like these give steady yields at moderate depth. Salt water and sodium are the usual issues near the coast, and nitrate where the water table is shallow; arsenic and radon from bedrock are less common.
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 Greenwich township
NJDEP records 1 hazardous waste site in Greenwich township, among 42 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.
- 25
- 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
- 13
- 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
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
Arsenic
Point-of-use reverse osmosis; Adsorptive media (iron-based) whole-house; Anion exchange
Lead
Point-of-use reverse osmosis; Certified lead-removal carbon filter; Neutralizing filter to raise pH and stop leaching
Nitrate
Point-of-use reverse osmosis; Anion exchange; Distillation
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 iron
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.
For arsenic
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
For arsenic
Whole-house arsenic and uranium filter
whole-house, at the point of entry, about $2,500
Adsorptive iron-based media; sized to your well yield.
For arsenic
Aquasana SmartFlow reverse osmosis
under-sink or countertop, about $225
Certified to NSF/ANSI 58 and 53 to reduce arsenic (96%, pentavalent), fluoride (90%), lead (99%), nitrate, nitrite and PFOA/PFOS at the kitchen tap, with a remineralizer.
For lead
Aquasana Claryum 3-Stage under-sink filter
under-sink or countertop, about $175
Certified to NSF/ANSI 53 to reduce 99% of lead and 99.7% of PFOA and PFOS at the tap. Not a fix for arsenic, nitrate or bacteria.
For lead
Acid neutralizing filter
whole-house, at the point of entry, about $1,200
Raises pH so plumbing stops leaching lead and copper.
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No water treatment company serves Greenwich 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 Greenwich township, and you get an email naming it first.
Common questions
Is there arsenic in well water in Greenwich township?
Arsenic was detected in 49% of 68 public well samples in Greenwich township, and 7% 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 Greenwich 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 Greenwich 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: 545 samples in Greenwich 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 6 contaminants in Greenwich township, up to 12 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: 42 regulated sites located in Greenwich 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.