Water systems

U.S. drinking water quality, system by system

Every water system below has its own dedicated page: the full list of contaminants measured in the utility's most recent annual report, each compared to its federal limit. Every figure is transcribed from the utility's own Consumer Confidence Report, cross-checked by a second model, and approved by a person.

1633
Water systems
46
States
29082
Measurements

Alabama4 systems

Alaska1 system

Arizona13 systems

Arkansas2 systems

California1280 systems

Colorado9 systems

Connecticut3 systems

Florida26 systems

Georgia11 systems

Hawaii1 system

Idaho2 systems

Illinois5 systems

Indiana10 systems

Iowa5 systems

Kansas5 systems

Kentucky2 systems

Louisiana4 systems

Maryland75 systems

Massachusetts12 systems

Michigan6 systems

Minnesota3 systems

Mississippi1 system

Missouri5 systems

Montana1 system

Nebraska2 systems

Nevada3 systems

New Hampshire1 system

New Jersey5 systems

New Mexico2 systems

New York5 systems

North Carolina15 systems

North Dakota1 system

Ohio6 systems

Oklahoma5 systems

Oregon4 systems

Pennsylvania3 systems

Rhode Island1 system

South Carolina3 systems

South Dakota1 system

Tennessee12 systems

Texas35 systems

Utah4 systems

Virginia13 systems

Washington7 systems

Washington, D.C.1 system

Wisconsin18 systems

New systems are added as each report clears verification. Every number traces back to the water utility's own published Consumer Confidence Report — a water-quality report covers an entire service area, not a single address.