💧 WaterQ

US States Water Quality Rankings

Explore water quality data for all US states. Click on a state to see details.

California
CA • 7,500 systems
B
Average Score 78/100
Population 39.2M
Texas
TX • 6,200 systems
B
Average Score 72/100
Population 29.5M
Florida
FL • 4,100 systems
B
Average Score 81/100
Population 21.8M
New York
NY • 3,800 systems
B
Average Score 85/100
Population 19.8M
Pennsylvania
PA • 3,200 systems
B
Average Score 82/100
Population 13.0M
Illinois
IL • 2,800 systems
B
Average Score 76/100
Population 12.7M
Ohio
OH • 2,700 systems
B
Average Score 74/100
Population 11.8M
Georgia
GA • 2,400 systems
B
Average Score 79/100
Population 10.8M
North Carolina
NC • 2,300 systems
B
Average Score 83/100
Population 10.5M
Michigan
MI • 2,500 systems
C
Average Score 71/100
Population 10.1M
New Jersey
NJ • 1,800 systems
B
Average Score 87/100
Population 9.3M
Virginia
VA • 2,100 systems
B
Average Score 84/100
Population 8.6M
Washington
WA • 2,200 systems
B
Average Score 88/100
Population 7.7M
Arizona
AZ • 1,900 systems
B
Average Score 82/100
Population 7.3M
Massachusetts
MA • 1,600 systems
B
Average Score 89/100
Population 6.9M
Tennessee
TN • 2,000 systems
B
Average Score 78/100
Population 6.9M
Indiana
IN • 1,800 systems
B
Average Score 75/100
Population 6.8M
Missouri
MO • 1,700 systems
B
Average Score 77/100
Population 6.2M
Maryland
MD • 1,400 systems
B
Average Score 86/100
Population 6.2M
Wisconsin
WI • 1,900 systems
B
Average Score 80/100
Population 5.9M
Colorado
CO • 1,600 systems
B
Average Score 85/100
Population 5.8M
Minnesota
MN • 2,100 systems
B
Average Score 87/100
Population 5.7M
South Carolina
SC • 1,500 systems
B
Average Score 81/100
Population 5.3M
Alabama
AL • 1,400 systems
B
Average Score 76/100
Population 5.1M
Louisiana
LA • 1,300 systems
B
Average Score 73/100
Population 4.7M
Kentucky
KY • 1,200 systems
B
Average Score 74/100
Population 4.5M
Oregon
OR • 1,400 systems
B
Average Score 86/100
Population 4.2M
Oklahoma
OK • 1,100 systems
B
Average Score 75/100
Population 4.0M
Connecticut
CT • 900 systems
B
Average Score 88/100
Population 3.6M
Iowa
IA • 1,300 systems
B
Average Score 82/100
Population 3.2M
Mississippi
MS • 1,000 systems
C
Average Score 72/100
Population 3.0M
Arkansas
AR • 1,100 systems
B
Average Score 76/100
Population 3.0M
Kansas
KS • 1,000 systems
B
Average Score 79/100
Population 2.9M
Utah
UT • 900 systems
B
Average Score 84/100
Population 3.3M
Nevada
NV • 800 systems
B
Average Score 80/100
Population 3.1M
New Mexico
NM • 900 systems
B
Average Score 77/100
Population 2.1M
Nebraska
NE • 900 systems
B
Average Score 81/100
Population 2.0M
West Virginia
WV • 800 systems
C
Average Score 70/100
Population 1.8M
Idaho
ID • 800 systems
B
Average Score 85/100
Population 1.9M
Hawaii
HI • 500 systems
A
Average Score 92/100
Population 1.4M
New Hampshire
NH • 700 systems
B
Average Score 89/100
Population 1.4M
Maine
ME • 800 systems
B
Average Score 88/100
Population 1.4M
Rhode Island
RI • 400 systems
A
Average Score 90/100
Population 1.1M
Montana
MT • 700 systems
B
Average Score 87/100
Population 1.1M
Delaware
DE • 300 systems
B
Average Score 86/100
Population 1.0M
South Dakota
SD • 600 systems
B
Average Score 83/100
Population 0.9M
North Dakota
ND • 500 systems
B
Average Score 81/100
Population 0.8M
Alaska
AK • 600 systems
B
Average Score 85/100
Population 0.7M
Vermont
VT • 500 systems
A
Average Score 91/100
Population 0.6M
Wyoming
WY • 400 systems
B
Average Score 84/100
Population 0.6M