You're a week from closing. The home inspection turned up nothing alarming. The agent shrugs when you ask about the water — “it's on city water, you're fine.”
Except the city had three lead exceedance notices in the last 5 years, the upstream utility is one of 1,000+ on EPA's PFAS detection list, and the home was built in 1962 — with original lead service line still connecting to the main. Nobody is going to tell you that on a Saturday showing. You have to look.
Here's how to actually check drinking water quality for a specific address before you sign — public records, private well testing, and the questions that turn vague “city water” into facts.
45%
Of U.S. tap water samples had detectable PFAS — and that was before the 2023 UCMR 5 round, which is finding more.
USGS National Tap Water Study · 2023
Step 1: Identify the water source
Public system or private well? That single question changes everything. Public systems are regulated under the Safe Drinking Water Act (SDWA), monitored quarterly, and required to fix violations. Private wells are regulated by no one — you're the lab, the regulator, and the cleanup crew.
If you don't know yet, check the property listing, the seller's disclosure, or call the local utility billing office. In most states the seller is supposed to disclose, but “supposed to” and “does” aren't always the same.
Step 2 (public water): pull the violation history
EPA's ECHO database (echo.epa.gov) shows every Safe Drinking Water Act violation for every public water system in the U.S. Search by utility name. Look at:
- Health-based violations — contaminants exceeded a legal limit. These are the serious ones. Repeated lead, disinfection byproducts, or nitrate violations are red flags.
- Monitoring & reporting violations — utility missed required tests. Frequent ones suggest a struggling system.
- UCMR 5 PFAS detections — even if not yet a violation, detections above the 4 ppt federal MCL mean treatment is coming and possibly rate hikes.
- Lead service line inventory — under EPA's 2024 LCRR, every utility must now publish its lead service line inventory. Search “[city] lead service line inventory.”
Step 3 (private well): test before you sign
If the property uses a well, request results from the most recent water test. If none exist or they're more than a year old, get one as a contingency. A reasonable well panel includes:
- Bacteria (total coliform + E. coli) — the most common acute risk
- Nitrate / nitrite — agricultural areas, especially dangerous for infants
- Arsenic — naturally occurring in many western and northeastern states
- Lead — from old plumbing inside the home itself
- Radon — yes, it can come in through water
- VOCs — if anywhere near old gas stations, dry cleaners, or industrial sites
- PFAS — if within ~5 miles of a military base, airport, or PFAS-using industry
State extension offices often subsidize basic panels. A complete diligence panel including PFAS typically runs $400–$700. Cheap compared to the cost of finding out after closing.
Step 4: lead service lines
Lead pipes are the silent inheritance of millions of pre-1986 U.S. homes. The water leaves the treatment plant lead-free; the lead leaches from your home's service line and internal plumbing. Even “safe” lead levels are not safe for children — there's no known safe blood lead level.
Under EPA's 2024 Lead and Copper Rule Revisions, every utility has published a Lead Service Line Inventory by October 2024. Look up the address. If “lead” or “unknown,” assume the worst until proven otherwise. Replacement costs $3,000–$10,000+, and some cities now subsidize it.
Step 5: PFAS and emerging contaminants
See the dedicated guides for PFAS as a homebuyer and PFAS from military bases. Short version: PFAS doesn't break down, doesn't leave your body easily, and the federal limit was set at 4 parts per trillion in 2024 for a reason. If you're downstream or downwind of a military base, airport, paper mill, or carpet/textile manufacturer, test specifically.
Treat the symptom while you investigate the source
Even if everything looks fine on paper, a quality home filter is the cheapest insurance you can buy. An under-sink filter with NSF 53 (lead) and NSF P473 (PFAS) certifications runs $200–$500 installed and addresses the most common silent risks.
Frequently Asked Questions
▸How do I find my water utility for a specific address?
Most water systems have a service-area map on their website, but the easiest path is EPA's Safe Drinking Water Information System (SDWIS) at echo.epa.gov. Search by city + state, and you'll see every public water system serving that area. For a definitive answer on a specific address, call the city utility billing department — they can tell you within minutes.
▸What's the difference between a Health-Based Violation and a Monitoring Violation?
A Health-Based Violation means the water actually exceeded a legal limit for a contaminant (lead, nitrate, disinfection byproducts, PFAS, etc.) — that's the serious kind. A Monitoring Violation means the utility missed a required test or sample. Both show up on the EPA's ECHO database, but only health-based ones tell you the water was unsafe at that point.
▸Are PFAS in my drinking water?
If you're on a large public water system (3,300+ people served), EPA's UCMR 5 dataset (2023–2025) tested for 29 PFAS compounds — search your utility. About 45% of U.S. tap water has detectable PFAS, per USGS. New federal MCLs took effect in 2024 (4 ppt for PFOA/PFOS), and utilities have until 2029 to comply. If you're on a private well, no one is testing for you — see the well section.
▸How much does it cost to test private well water?
A basic well panel (bacteria, nitrate, pH, hardness, iron) runs $100–$200 at a state-certified lab. A comprehensive panel adding lead, arsenic, radon, and VOCs is $300–$500. PFAS testing adds $300–$500 on top. Most state extension offices subsidize basic testing. Always test before closing if the home uses a private well — sellers are NOT required to disclose well problems in most states.
▸Should I get a Tap Score or similar at-home water test?
Yes, if you want a fast, certified picture without scheduling a state lab pickup. Mail-in kits (Tap Score, MyTapScore, SimpleLab) use the same EPA-certified labs municipalities use. The Essential City Water Test (~$150) covers 100+ contaminants including lead, copper, chlorine, and bacteria. PFAS testing is a separate, more expensive panel. For a first-pass diligence check, it's worth the money.
▸Does my home have lead pipes?
If your home was built before 1986, there's a real chance. Under EPA's 2024 Lead and Copper Rule Revisions (LCRR), every U.S. water utility must publish a Lead Service Line Inventory by October 2024 — search '[your city] lead service line inventory'. If unknown or lead is suspected, $20 home test kits (or a filter certified to NSF 53 for lead) buy peace of mind until replacement.
▸Can I just rely on my city's annual water report?
The Consumer Confidence Report (CCR) is useful but limited. It reports annual averages — not seasonal spikes, not specific addresses, and not contaminants the city doesn't test for. CCRs typically don't include PFAS results, don't tell you about your specific service line, and don't show violations between annual reports. Use it as a starting point, not the full picture.
Bottom line
Don't inherit somebody else's water problem. ID the source, pull violation history, check lead service line status, test the well if applicable, and add a certified filter as cheap insurance. $200 of diligence beats a $10,000 surprise.
Related: how to check PFAS near my address, PFAS from military bases, water by city directory.
Check any address
See the public-record picture for any U.S. address
VetMyAddress turns public EPA, FEMA, AirNow, water, and Census-backed records into a plain-English address report.