Tap water by state and county
Pick your state to see hardness, PFAS sampling, lead and violations for the largest water systems in each county we cover.
- Alabama3 counties: Jefferson, Madison, Mobile
- Arizona3 counties: Maricopa, Pima, Pinal
- Arkansas1 county: Pulaski
- California22 counties: Los Angeles, San Diego, Orange…
- Colorado8 counties: El Paso, Denver, Arapahoe…
- Connecticut3 counties: Fairfield, Hartford, New Haven
- Delaware1 county: New Castle
- District of Columbia1 county: District of Columbia
- Florida20 counties: Miami-Dade, Broward, Palm Beach…
- Georgia4 counties: Fulton, Gwinnett, Cobb…
- Hawaii1 county: Honolulu
- Idaho1 county: Ada
- Illinois5 counties: Cook, DuPage, Lake…
- Indiana4 counties: Marion, Lake, Allen…
- Iowa1 county: Polk
- Kansas2 counties: Johnson, Sedgwick
- Kentucky1 county: Jefferson
- Louisiana3 counties: East Baton Rouge Parish, Jefferson Parish, Orleans Parish
- Maryland4 counties: Montgomery, Prince George's, Anne Arundel…
- Massachusetts6 counties: Middlesex, Worcester, Essex…
- Michigan6 counties: Wayne, Oakland, Macomb…
- Minnesota4 counties: Hennepin, Ramsey, Dakota…
- Missouri2 counties: St. Louis, Jackson
- Nebraska1 county: Douglas
- Nevada2 counties: Clark, Washoe
- New Hampshire1 county: Hillsborough
- New Jersey10 counties: Bergen, Middlesex, Essex…
- New Mexico1 county: Bernalillo
- New York8 counties: Kings, Suffolk, Nassau…
- North Carolina4 counties: Wake, Mecklenburg, Guilford…
- Ohio8 counties: Franklin, Cuyahoga, Hamilton…
- Oklahoma2 counties: Oklahoma, Tulsa
- Oregon4 counties: Multnomah, Washington, Clackamas…
- Pennsylvania10 counties: Philadelphia, Allegheny, Montgomery…
- Rhode Island1 county: Providence
- South Carolina5 counties: Greenville, Charleston, Richland…
- Tennessee5 counties: Shelby, Davidson, Knox…
- Texas17 counties: Harris, Dallas, Tarrant…
- Utah3 counties: Salt Lake, Utah, Davis
- Virginia4 counties: Fairfax, Prince William, Loudoun…
- Washington5 counties: King, Pierce, Snohomish…
- Wisconsin3 counties: Milwaukee, Dane, Waukesha
Not listed? The water quality lookup covers every county in EPA records.