Private Well Water Testing Guide

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Who this page is for

The roughly 1 in 4 New York households on a private well

An estimated 26% of New York adults rely on private well water, according to the NY Department of Health. If that's you, none of the Consumer Confidence Report guidance elsewhere on this site applies — wells aren't part of the regulated public water system, and there's no annual report generated on your behalf. Testing your own water, on your own schedule, is the equivalent step, and it's the single most important habit a well owner can build.

The basics

Why testing is entirely on you

New York does not regulate private water wells — there are no state-mandated standards for well construction or water quality testing. That responsibility falls entirely on the well owner. Wells can pick up contamination from natural sources (soil or rock containing arsenic or lead, nearby flooding) or from human activity (agriculture, mining, industrial spills), and because there's no requirement to test, problems can go unnoticed for years without a deliberate testing routine.

The baseline recommendation from the EPA and CDC is straightforward: test once a year for total coliform bacteria, nitrates, total dissolved solids, and pH. These four cover the most common and fastest-changing risk factors. Other contaminants — including metals like arsenic, barium, iron, and manganese — are typically tested at least once, with more frequent re-testing only if your situation changes.

Testing checklist

Do you need additional testing right now?

Beyond the annual baseline panel, NY DOH and EPA guidance points to specific situations that call for extra testing sooner. If every item below is true for your household, additional testing likely isn't needed yet:

• The water has no unusual taste, color, or smell
• The well has been tested at least once since it was drilled or since you started using it
• It was tested for total coliform bacteria, nitrates, TDS, and pH within the last 12 months
• No one in the household is pregnant, planning to become pregnant, or using the water for infant formula
• No recurring gastrointestinal illness (stomach aches, diarrhea) among anyone using the water
• No flooding in the area since the last test
• No chemical spills (such as gasoline) near the well
• No new industrial activity nearby — farming, oil and gas development, waste processing
• No part of the well has been repaired or replaced since it was last tested
• If a water treatment system is installed, the water has been tested since installation

If you can't check every box, that's a signal for additional or sooner testing — not necessarily an emergency, but a reason to test rather than wait for the next annual cycle. Homes built before 1986 should also have tap water specifically tested for lead and copper, since these typically come from household plumbing rather than the well itself.

Common well contaminants

What shows up in NY well water

New York Department of Health analysis of USGS well-water studies across several NY counties found that most wells tested had contaminant levels considered safe, but some wells did exceed limits for metals such as arsenic and barium — both naturally occurring and both known health hazards even at low concentrations. Wells were more likely to exceed the less-strict "secondary" aesthetic guidelines for substances like iron and manganese, which mainly affect taste, staining, and plumbing rather than posing a direct health risk, but are still worth addressing.

These specific findings covered a set of Northern NY counties rather than our core downstate New York coverage area, so treat them as an illustration of what USGS studies commonly find in New York groundwater generally — not a claim about your specific well. The only way to know what's in your water is to test it.

Getting tested

How to actually get your well tested

• Use a New York-accredited laboratory — NYSDOH maintains an accredited lab list
• Cornell University's NYS Water Resources Institute and Cornell Cooperative Extension offer private-well testing guidance and resources for New York homeowners
• The free, self-paced Private Well Class covers well maintenance and water quality basics in more depth than any single page can
• If you have questions about interpreting a result, contact your county health department or the New York State Department of Health's Bureau of Water Supply Protection through health.ny.gov

When to get help

When to get professional help

If a test comes back with a result you don't understand, you're dealing with a persistent taste/odor/staining issue, or you want a treatment system sized for your specific well's results, a local water treatment provider can help interpret results and recommend equipment matched to what's actually in your water.

Official sources

Official source links

• NY Department of Health: Private Well Water
• EPA: Private Drinking Water Wells
• CDC: Private Water Systems
• Cornell Cooperative Extension: Water Resources

FAQ

Frequently asked questions

Is my well water regulated by the state?

Per the NY Department of Health: no. New York does not regulate private water wells — there are no state-mandated construction or water quality testing standards. The well owner is fully responsible for making sure the water is safe.

What should every well owner test for every year?

At minimum, total coliform bacteria, nitrates, total dissolved solids, and pH — the core annual panel recommended by the EPA and CDC. Additional tests depend on your specific situation, covered in the checklist below.

Where can I get my well tested?

Use a New York State ELAP-approved laboratory. Cornell Cooperative Extension and the NYS Water Resources Institute are good starting points for test guidance and well water education.

My home was built before 1986 — does that matter?

Yes. Homes built before 1986 are more likely to have lead-containing pipes, solder, or fixtures. NY DOH specifically recommends testing tap water for lead and copper in older homes, since these typically enter water from household plumbing rather than the well itself.

Last reviewed: July 9, 2026