All 735 US Counties Tracked for Water Quality

Independent water quality summaries for 735 US counties across all 50 states. Each county page covers UCMR5 PFAS detection levels, regulated contaminant violations, top affected utilities, and county-specific contamination context.

Quick Answer

This index links to 735 pages organized into 50 categories for easy browsing.

Alabama (17)

Arizona (9)

Arkansas (7)

California (39)

Colorado (11)

Connecticut (8)

Delaware (3)

District of Columbia (1)

Florida (34)

Georgia (13)

Hawaii (4)

Idaho (3)

Illinois (31)

Indiana (12)

Iowa (12)

Kansas (6)

Kentucky (11)

Louisiana (7)

Maine (14)

Maryland (11)

Massachusetts (12)

Michigan (26)

Minnesota (16)

Mississippi (4)

Missouri (12)

Montana (4)

Nebraska (4)

Nevada (3)

New Hampshire (9)

New Jersey (20)

New Mexico (11)

New York (51)

North Carolina (56)

North Dakota (3)

Ohio (32)

Oklahoma (6)

Oregon (10)

Pennsylvania (49)

Rhode Island (3)

South Carolina (15)

South Dakota (2)

Tennessee (8)

Texas (37)

Utah (6)

Vermont (9)

Virginia (19)

Washington (16)

West Virginia (19)

Wisconsin (19)

Wyoming (1)