ZIP Code Water Quality Directory
151 ZIP codes with water quality data across 27 states. Select a state to browse its ZIP codes.
B+
1 ZIPs Alabama
C+
12 ZIPs Arizona
B
33 ZIPs California
C+
2 ZIPs Colorado
C-
2 ZIPs Connecticut
C+
2 ZIPs Florida
A-
1 ZIPs Iowa
B
1 ZIPs Kansas
B
1 ZIPs Massachusetts
B+
9 ZIPs Michigan
A-
11 ZIPs Minnesota
C+
1 ZIPs Mississippi
C+
8 ZIPs Montana
A-
4 ZIPs Nebraska
B
3 ZIPs Nevada
C-
13 ZIPs New Mexico
B+
3 ZIPs New York
C+
1 ZIPs North Carolina
A-
6 ZIPs North Dakota
C
6 ZIPs Oklahoma
C
1 ZIPs Oregon
B+
12 ZIPs South Dakota
C+
1 ZIPs Texas
B-
1 ZIPs Utah
B-
3 ZIPs Washington
B
10 ZIPs Wisconsin
C+
2 ZIPs Wyoming