Water Quality by ZIP Code
Check PFAS contamination, water hardness, and tap water safety for your ZIP code. Get instant access to water quality reports and contaminant testing data.
Across 12,603 cities with water-quality test results on file, 84% have at least one contaminant detected above health guidelines. Enter your ZIP code to see what's in your water.
What You Can Find by ZIP Code
PFAS Contamination Levels
Check if your ZIP code has PFAS "forever chemicals" in drinking water. Get detailed contamination maps and safety information.
Water Hardness Levels
Find water hardness levels for your area. Learn if you need water softening and what hardness means for your plumbing.
Tap Water Safety Reports
Is your tap water safe to drink? Get comprehensive safety assessments and contaminant reports for your ZIP code.
Water Quality Reports
Access detailed water quality testing data, including lead, arsenic, nitrates, and hundreds of other contaminants.
Water Source Information
Discover where your drinking water comes from—surface water, groundwater, or both—and treatment methods used.
Contaminant Analysis
View all detected contaminants, compare to EPA limits, and find certified filters that remove specific pollutants.
Understanding Water Hardness by ZIP Code
Water hardness varies significantly across the US. Use our ZIP code lookup to find your local water hardness level and understand what it means for your home.
What Hard Water Means for You
- •Plumbing: Hard water causes mineral buildup in pipes and appliances, reducing efficiency and lifespan
- •Cleaning: Hard water makes soap less effective, leaving residue on dishes and laundry
- •Skin & Hair: Can cause dryness and irritation, making hair feel rough and skin itchy
- •Health: Hard water is safe to drink and may provide beneficial minerals like calcium and magnesium
Popular ZIP Codes
Quick access to water quality data for major metropolitan areas
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Why Search Water Quality by ZIP Code?
Localized Contamination Risks
Water quality varies dramatically by location. ZIP code searches reveal contamination specific to your neighborhood, including PFAS from nearby military bases, lead from local infrastructure, or agricultural runoff affecting rural areas.
EPA Doesn't Regulate Everything
The EPA only sets legal limits for 90 contaminants, but over 300 pollutants can be present in drinking water. Many utilities test for additional contaminants—our ZIP code tool shows what's actually in your water, not just what's legally required.
Actionable Information
Once you know what's in your water, you can take action. Our platform connects you with:
- •NSF-certified filters proven to remove specific contaminants
- •EPA-certified testing labs in your state
- •Water treatment solutions tailored to your water quality
How It Works
Enter Your ZIP Code
Type your 5-digit ZIP code into the search bar above. We'll instantly match it to your local water utility and system.
View Your Water Report
See a comprehensive breakdown of all detected contaminants, water sources, treatment methods, hardness levels, and how your water compares to EPA standards and health guidelines.
Take Action
Get personalized recommendations for water filters, testing labs, and treatment solutions based on your specific water quality issues. All recommendations use NSF-certified products proven to work.
PFAS Contamination by ZIP Code
PFAS (per- and polyfluoroalkyl substances), commonly known as "forever chemicals," are synthetic compounds that do not break down in the environment or the human body. They have been found in drinking water systems across the United States, often at levels exceeding EPA health advisory limits. Our ZIP code lookup reveals whether PFAS have been detected in your local water supply.
In April 2024, the EPA set the first-ever legally enforceable limits for PFAS in drinking water: 4 parts per trillion (ppt) for PFOS and PFOA individually. Many water systems are still testing and reporting compliance. Enter your ZIP code above to check the latest PFAS data for your area.
- •What are PFAS? A group of over 14,000 man-made chemicals used in non-stick coatings, food packaging, firefighting foam, and industrial processes since the 1940s
- •Health risks: Linked to increased cancer risk, thyroid disease, immune system effects, reproductive issues, and elevated cholesterol levels
- •How they enter water: Industrial discharge, military and civilian airports using PFAS-containing firefighting foam, wastewater treatment plants, and landfill runoff
- •What you can do: Reverse osmosis filters and activated carbon systems are the most effective at removing PFAS from drinking water
Learn more about PFAS in drinking water, or enter your ZIP code above to check PFAS levels in your area.
Water Contamination Report by ZIP Code
Water contamination varies significantly by location due to differences in water sources, treatment infrastructure, and local pollution sources. Our ZIP code reports cover every contaminant your local water utility reported, comparing each result against both EPA legal limits and stricter health-based guidelines.
Common Contaminants Found Above Health Guidelines
Based on EPA testing data across 18,735 water systems, these contaminants are most frequently detected above health-based guidelines:
How contaminated is my water?
The answer depends on your location. Across the cities with water-quality test results on file, 84% have at least one contaminant above health guidelines. That does not necessarily mean the water is unsafe to drink — many contaminants are detected at low levels — but it does mean you should be informed.
Enter your ZIP code above to see a full contamination report for your area, including which contaminants were detected and how they compare to safe levels.
Where Does My Water Come From? Find Your Water Source by ZIP Code
Your drinking water comes from one of three sources: surface water (rivers, lakes, reservoirs), groundwater (underground aquifers), or a combination of both. Knowing your water source matters because each type carries different contamination risks.
Surface Water
Rivers, lakes, and reservoirs. More susceptible to agricultural runoff, industrial discharge, and seasonal variation. Requires extensive treatment including filtration and disinfection.
Groundwater
Underground aquifers accessed through wells. Naturally filtered by soil and rock, but can contain elevated levels of arsenic, radium, nitrates, and hardness minerals depending on local geology.
Why does your water source matter? Surface water systems typically have higher levels of disinfection byproducts (like trihalomethanes) from chlorine treatment, while groundwater systems are more likely to have naturally occurring contaminants like arsenic and radium. Treatment methods also differ — surface water usually undergoes more extensive filtration.
Enter your ZIP code above to find out where your water comes from, what treatment methods your utility uses, and what contaminants to watch for based on your water source type.
Frequently Asked Questions About Water Quality by ZIP Code
Enter your 5-digit ZIP code in the search bar above. We'll instantly show you water quality data including PFAS levels, water hardness, and all detected contaminants from utilities serving your area. Results include comparisons to EPA health guidelines and filter recommendations.
Coverage, sources & how to cite this tool
This lookup resolves 26,003 US ZIP codes to 18,735 city water-system records. Both figures are counted from the same index the lookup queries, so the coverage number is what the tool can actually answer for rather than an estimate of it.
Last updated — the date the ZIP and city indexes were last rebuilt from the sources below, and the same date this site publishes as the last-modified stamp for every ZIP page in its sitemap.
Data sources
- EPA Safe Drinking Water Information System (SDWIS) federal reportingThe public water systems themselves — PWSID, system name, population served, and the places each system reports serving.
- EPA ECHO — Safe Drinking Water Act download summaryViolation and enforcement history for those systems, which is what a ZIP's status badge reflects.
- Consumer Confidence Reports (CCRs) published by water utilitiesThe measured contaminant levels and their sample dates. Every figure on a ZIP page is the utility's own reported result, not our measurement.
- zipcodes 8.0.0 (npm), from federalgovernmentzipcodes.usThe ZIP-to-place assignment used to route a ZIP to its city record. It is a city-name and state match, not a utility service-area boundary.
What this data does not establish
- The last-updated date is when the ZIP and city indexes were rebuilt from the sources above. It is not a sampling date: each contaminant carries its utility's own sample date, shown with that result on the ZIP's page.
- A ZIP is matched to a city record by name and state, so a ZIP that straddles two water systems resolves to the city record that claims it. Where more than one city record claims a ZIP, the ZIP page lists them all.
- A contaminant absent from a report means the utility did not report it, which is not the same as a non-detect. We publish no value rather than record a zero.
- Coverage is the count of ZIP codes the lookup can resolve today. ZIP codes outside it are served by systems whose reports we have not ingested, and those ZIPs return an uncovered page rather than an empty one.
Suggested citation
The records underneath this tool are U.S. Government public records (usa.gov copyright policy). Quote them freely; a link back is what lets your reader check a figure against the same index we read.
TapWaterData Water Quality by ZIP Code, data as of 2026-07-28. https://www.tapwaterdata.com/zip
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