Well water in Southampton, New York

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Testing recommended

tested well samples in Southampton exceeded the EPA limit for nitrate (10 mg/L), based on public data from USGS Water Quality Portal.

4,287 test results across 15 contaminants from at least 113 wells, 1919 to 2025; chloride has the most at 838. Data refreshed September 3, 2026.

Compiled by Nick at Well Water Nerd from public records. How these pages are built

What individual samples found

Each row summarizes every public sample for that contaminant inside Southampton. 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
Nitrate 1973 to 2024	7%	230	92%	0.899	20	10 mg/L EPA limit
Fluoride 1971 to 2025	0%	325	38%	0	0.7	4 mg/L EPA limit
Copper 1919 to 2022	0%	323	45%	0	0.45	1.3 mg/L EPA limit
Lead 1971 to 2022	0%	97	28%	0	0.228	15 ug/L EPA limit
Arsenic 1919 to 2022	0%	76	17%	0	10	10 ug/L EPA limit
Chloride 1919 to 2025	no limit	838	100%	13	14,300	250 mg/L nuisance level
Iron 1919 to 2025	no limit	810	81%	200	43,100	300 ug/L nuisance level
Manganese 1919 to 2025	no limit	808	57%	12.6	13,000	300 ug/L health guideline
Sodium 1919 to 2025	no limit	741	100%	8.2	6,890	20 mg/L health guideline

Sampled fewer than 10 times, too few to summarize: PFOA (8), PFOS (8), Radium (226 + 228) (8), E. coli (6), Uranium (7), Radon (2).

Over time

Share of samples above the limit by period. A cell needs ten samples to show; a comparison needs twenty in each period. Later periods sample fewer wells, and often the ones already known to have a problem.

Contaminant	before 2000	2000s	2010s	2020s
Fluoride	0%283 samples	0%23 samples	0%14 samples	n/a
Copper	0%304 samples	n/a	0%14 samples	n/a
Nitrate	8%182 samples	0%21 samples	0%19 samples	n/a

Nitrate above the limit in Southampton fell from 8% of 182 samples before 2000 to 0% of 21 in the 2000s.

Fluoride has held within a few points between the two most recent periods with enough samples.

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 address

What this means

The contaminants most often above their limit here are nitrate (7% of 230 samples). A well next door can differ sharply from yours because bedrock fractures, well depth and plumbing all matter, so these rates describe the area, not your tap.

Chloride, Iron, and Manganese are widespread in local groundwater. They are mainly a staining and taste problem, but high manganese also carries a health advisory for infants.

What to test for in Southampton

1
Nitrate
7% of 230 local samples were above the limit.
2
Radon
Median local reading is 214 pCi/L.
3
PFOA
Above the limit in 3 of 8 local samples; too few to quote a rate.
4
PFOS
Above the limit in 3 of 8 local samples; too few to quote a rate.
5
Radium (226 + 228)
Above the limit in 2 of 8 local samples; too few to quote a rate.
6
E. coli
Above the limit in 1 of 6 local samples; too few to quote a rate.
7
Chloride
Detected in 100% of local samples.
8
Volatile organic compounds (VOCs)
36 hazardous waste sites on record locally.
9
Metals panel
36 hazardous waste sites on record locally.

Test your Southampton well for nitrate, radon and PFOA

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 $209 Already 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 York: certified labs, state programs and prices.

Already have results back? Get your lab report read against the Southampton numbers, $29. Every line explained, ranked by what matters, with the fix for each.

Wells in Southampton

2,933 domestic wells in Southampton are on record with the state. the typical well is 78 feet deep (one in ten goes past 170 feet).

Find your own well's report

The state keeps the driller's report for most wells drilled since 1984. It tells you how deep your well is, where bedrock starts, and how much water it makes, which decides what treatment can work.

Open NYSDEC water well completion reports and choose Water Well.
The report lists depth, depth to bedrock, cased depth, yield and the driller.

Drillers have filed reports with the state since April 2000; a well drilled before then usually has no record.

The rock under Southampton

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 York

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, NYSDOH
Environmental Laboratory Approval Program, NYSDOH

Contamination sources on record in Southampton

NYSDEC remediation sites records 36 hazardous waste sites in Southampton, among 40 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.

36: hazardous waste sitesSolvents, degreasers and metals from industrial sites can travel far in fractured bedrock.
4: other remediation projects

Treatment that fits the local profile

Nitrate

Point-of-use reverse osmosis; Anion exchange; Distillation

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

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 nitrate

Under-sink reverse osmosis system

under-sink or countertop, about $300

Look for NSF/ANSI 58 certification listing the contaminant you need removed.

For nitrate

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 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.

Free, no obligation

Get on the list for a free in-home water test in Southampton

No water treatment company serves Southampton 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 Southampton, and you get an email naming it first.

Common questions

How deep are wells in Southampton?

The typical domestic well in Southampton is 78 feet deep, based on 2,933 wells reported to the state. One in ten is deeper than 170 feet.

Is there arsenic in well water in Southampton?

Arsenic was detected in 17% of 76 public well samples in Southampton, 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 Southampton?

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 Southampton

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 York dataset as CSV, every county and town, with the sources named.

Sources

USGS Water Quality Portal: 4,287 samples in Southampton. Data from the Water Quality Portal, a service of USGS, EPA and USDA; groundwater samples collected by USGS and cooperators. Retrieved September 3, 2026.
NYSDEC water well completion reports: 6,242 well records in Southampton, 2,933 domestic. Water well completion reports filed with the New York State Department of Environmental Conservation Water Well Contractor Program since 2000. Only aggregates are shown; owner names and addresses are never stored. Retrieved September 16, 2026.
NYSDEC remediation sites: 40 regulated sites located in Southampton. State Superfund, brownfield, voluntary cleanup, RCRA and spill remediation sites from the New York State Department of Environmental Conservation Environmental Remediation Sites database. Retrieved September 16, 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.