Is My Well Water Safe to Drink? How to Know for Sure

Here's what most well owners don't realize: the EPA does not regulate private wells. Unlike city water, which is tested and treated by your utility, your private well water is entirely your responsibility. And according to USGS data, 1 in 5 private wells has at least one contaminant above health-based benchmarks.

That doesn't mean your well water is unsafe — many wells produce excellent water. But the only way to know for sure is to test it.

The Scale of Private Well Use

Over 23 million U.S. households rely on private wells for their drinking water. That's roughly 15% of the population drinking water that's never been tested by a regulatory agency.

Common Contaminants in Private Wells

Contaminant	Source	Health Risk
Total coliform bacteria	Surface water infiltration	Indicates possible sewage contamination
E. coli	Fecal matter from animals or septic	Serious gastrointestinal illness
Nitrates	Fertilizers, septic systems, animal waste	Dangerous for infants (blue baby syndrome)
Arsenic	Natural rock formations	Cancer, skin damage, circulatory problems
Lead	Old pipes, fittings, solder	Brain damage, developmental issues in children
PFAS	Industrial sites, firefighting foam, landfills	Cancer, immune system effects, hormone disruption
VOCs	Gas stations, dry cleaners, industrial sites	Cancer, liver/kidney damage

Warning Signs Your Well Water May Be Unsafe

While many contaminants are invisible and odorless, watch for these warning signs:

Color changes — brown, yellow, or cloudy water
Odor — rotten egg smell, chemical smell, musty odor
Taste changes — metallic, salty, or chemical taste
Nearby land use — farms (pesticides/nitrates), gas stations (VOCs), industrial facilities (PFAS)
Recent events — flooding, nearby construction, septic problems
Illness — recurring gastrointestinal issues in household members

How to Get Your Well Water Tested

State Health Department Labs

Most state health departments offer basic water testing (bacteria + nitrates) for $0–$50. Contact your local health department for sample kits and instructions.

Private Certified Labs

For comprehensive testing including heavy metals, PFAS, and VOCs, use a state-certified private lab. Companies like Tap Score offer mail-in test kits ($100–$500 depending on the panel).

DIY Test Kits

Home test kits ($20–$50) can screen for basic parameters but are not accurate enough for health decisions. Use them for quick screening only — always confirm with a certified lab.

Immediate Red Flags — Stop Drinking Your Water

If any of these show up in a certified lab test, stop using your water for drinking and cooking immediately:

Any detectable E. coli — indicates fecal contamination
Positive total coliform — shock chlorinate and retest
Nitrates above 10 mg/L — especially dangerous for infants
Arsenic above 10 µg/L — long-term cancer risk
Any detectable lead above 15 µg/L — toxic at any level for children

Use bottled water until the issue is resolved. Contact your local health department for guidance on treatment and retesting.