Private Well Water Quality Standards in NY and PA
Quick answer: There is no federal law that sets water quality standards for private wells — the Safe Drinking Water Act only covers public water systems. Both New York and Pennsylvania leave private wells unregulated, but each state publishes its own testing guidance. New York recommends annual bacteria testing plus a broader panel every 3 to 5 years. Pennsylvania recommends annual testing too, but has no statewide law requiring it at all — not even at the sale of a home. Both states use the same federal benchmarks (like the EPA’s 10 mg/L nitrate limit) as the reference point for what’s considered safe.
If you own a private well in Western New York or Northwestern Pennsylvania, here’s the part that surprises most people: nobody is checking your water for you. Public water systems are tested constantly and held to legal limits. Private wells are not. This guide breaks down what standards actually apply, what each state recommends, and where New York and Pennsylvania differ.
Why There’s No Single “Legal Standard” for Private Wells
The federal Safe Drinking Water Act sets legal limits for public water systems — the kind that serve towns, cities, and apartment buildings. Private wells are specifically excluded. That means there’s no federal agency that inspects your well or tells you your water failed a test. Both New York and Pennsylvania follow this same basic rule: your private well is your responsibility, not the government’s.
That doesn’t mean there’s no guidance at all. Both states — and the EPA — publish recommended benchmarks for common contaminants. These aren’t laws you can be fined for breaking. They’re the numbers health experts use to say “this level is considered safe” and “this level is a concern.”
Contaminant Standards: EPA, New York, and Pennsylvania Side by Side
Here’s how the most commonly tested contaminants compare across the federal benchmark and each state’s guidance:
| Contaminant | EPA Benchmark | New York Guidance | Pennsylvania Guidance |
|---|---|---|---|
| Coliform bacteria / E. coli | 0 (none allowed) in public water | Test annually — any positive result needs follow-up | Test annually per PA DEP recommendation |
| Nitrate | 10 mg/L (health-based limit) | Test every 3-5 years; more often near farmland | Same 10 mg/L benchmark used as reference |
| Arsenic | 10 µg/L (0.010 mg/L) | Flagged by NYS DOH Risk Mapper in bedrock areas | Recommended testing where DEP flags geology |
| Lead | Action level 15 µg/L (0.015 mg/L) | Recommended for homes with older plumbing | Recommended for homes with older plumbing |
| Iron | 0.3 mg/L (secondary, aesthetic) | Included in standard comprehensive panel | Included in standard comprehensive panel |
| Manganese | 0.05 mg/L (secondary, aesthetic) | Included in standard comprehensive panel | Included in standard comprehensive panel |
| PFAS | 4 parts per trillion (PFOA/PFOS, public systems only) | Not required for private wells; rebate pilot in some counties | No specific state standard for private wells |
What New York Recommends
The New York State Department of Health recommends testing your well for bacteria at least once a year, and for a broader set of contaminants — nitrate, iron, manganese, hardness, pH, and more — every 3 to 5 years. New York also built a free online tool called the Private Well Risk Mapper, which shows flood risk, agricultural runoff risk, and arsenic risk for any address in the state. A handful of counties even offer a free PFAS testing and rebate program for qualifying homeowners.
What Pennsylvania Recommends
Pennsylvania takes a lighter touch. The state’s Department of Environmental Protection (DEP) recommends the same basic idea — test annually for bacteria — but Pennsylvania is one of only two states with no statewide law covering private well construction, maintenance, or testing at all. There’s no requirement to test your well even when you sell your home, though some individual counties and townships add their own rules on top of the state’s recommendations.
Not sure what your water actually contains? McCandless offers comprehensive water testing across Chautauqua, Cattaraugus, and Erie Counties in NY and Warren County, PA. Call (716) 666-3708.
Where New York and Pennsylvania Really Differ
- New York publishes a free, address-specific risk mapping tool. Pennsylvania has no equivalent statewide tool.
- Some New York counties offer subsidized PFAS testing. Pennsylvania has no comparable statewide program.
- Pennsylvania has zero statewide requirements for private wells — not even at real estate closing. New York requires a bacteria test before closing on a home with a private well.
- Both states use the same federal EPA numbers as their reference benchmarks — the difference is in how much each state actively promotes testing, not in what “safe” means.
For a deeper look at regional contamination statistics — including how many area wells actually test positive for these contaminants — see our full report: Private Well Water Quality in Western NY & NW PA (2026 Data).
Private Well Water Quality Standards at a Glance
- No federal law regulates private wells — the Safe Drinking Water Act only covers public systems.
- Both NY and PA use EPA benchmarks as reference points, even though neither state legally requires testing.
- New York recommends annual bacteria tests and a broader panel every 3-5 years, plus a free Risk Mapper tool.
- Pennsylvania recommends the same testing but has no statewide mandate at all, even at home sale.
- Next step: schedule a water test with McCandless to see where your well actually stands.
Frequently Asked Questions
Is there a law requiring private well owners to test their water in New York or Pennsylvania?
No. Neither state has a law requiring routine testing of private wells. New York does require a bacteria test before you can close on a home sale involving a private well, but that’s the only mandatory testing trigger in either state.
What is considered a safe nitrate level in well water?
The EPA’s health-based benchmark is 10 mg/L. This is the number both New York and Pennsylvania reference when interpreting nitrate test results, even though neither state has its own separate legal limit for private wells.
Does Pennsylvania have any well water regulations at all?
Pennsylvania regulates new well construction (permits, setback distances from septic systems, casing standards) but has no statewide law covering ongoing water quality testing for existing wells. It’s one of only two U.S. states without comprehensive private well regulations.
Why does New York have a Risk Mapper but Pennsylvania doesn’t?
New York State chose to invest in this free, address-specific tool through its Department of Health, launched in 2024. Pennsylvania hasn’t built an equivalent statewide resource, though individual counties sometimes maintain their own local water quality data.
If my water meets the EPA benchmark, is it definitely safe?
EPA benchmarks are a reasonable safety reference, but they were developed primarily for public water systems tested regularly over time. A single test showing levels below the benchmark is a good sign, but conditions in a private well can change with weather, land use, and seasons — which is why annual retesting matters even after a clean result.
Related Resources
- Water Testing — Jamestown & Western NY
- Private Well Water Quality in Western NY & NW PA (2026 Data)
- Chautauqua County, NY
- Erie County, PA
- Warren County, PA
Knowing the standards is the first step — knowing what’s actually in your water is the one that matters. McCandless has tested private wells across Western NY and Northwestern PA for nearly 50 years. Contact us today to schedule a comprehensive water test.
About McCandless Well Drilling and Services, Inc.: For nearly 50 years, McCandless Well Drilling and Services, Inc. has provided well drilling, pump service, and water testing and treatment across Chautauqua, Cattaraugus, and Erie Counties in New York and Warren County, Pennsylvania. Call (716) 666-3708.