New York’s private-well population is concentrated largely upstate and in rural parts of the state, outside New York City’s and other municipal systems’ service areas. Private wells are not regulated under the federal Safe Drinking Water Act, and New York, like every state, leaves testing to the well owner.
Why test
Well water can look, taste, and smell normal while still carrying contaminants at concerning levels — bacteria, nitrate, and arsenic in particular have no reliable warning signs. Some New York communities have also identified PFAS in well water near sites with a history of firefighting-foam use or certain industrial activity, which is part of why a baseline test matters even in areas without an obvious agricultural or industrial source nearby.
What to test for
A baseline panel for a New York well should include:
- Total coliform bacteria and E. coli — a standard first check for well vulnerability to contamination.
- Nitrate — relevant in agricultural parts of the state and near septic systems; especially important for households preparing infant formula with well water.
- Arsenic — naturally occurring arsenic has been documented in groundwater in parts of upstate New York; it has no taste or odor at concerning levels.
- Lead — mainly relevant to household plumbing rather than the source water.
- PFAS — worth adding to a test panel if your property is near a former firefighting-foam training site, certain industrial facilities, or a landfill; a standard baseline panel doesn’t automatically include PFAS, so ask your lab specifically if this applies to your area.
How often to test
EPA guidance recommends testing private wells for bacteria and nitrate at least annually, and again any time water quality changes noticeably, after well or plumbing work, or after flooding.
Where to find a certified lab
New York State’s Environmental Laboratory Approval Program (ELAP), run by the Wadsworth Center, certifies labs for drinking-water and other environmental testing statewide and provides a searchable directory — see the source link above.
After you test
If a result comes back above a health-based guideline, see our filter guides for which technologies are actually certified to remove the specific contaminant found.