ZIP Code Water Quality Directory
21,819 ZIP codes with water quality data across 50 states. Select a state to browse its ZIP codes.
B+
540 ZIPs Alabama
C-
106 ZIPs Alaska
C+
363 ZIPs Arizona
B
410 ZIPs Arkansas
B
1,818 ZIPs California
C+
415 ZIPs Colorado
C
122 ZIPs Connecticut
B
65 ZIPs Delaware
B
285 ZIPs District of Columbia
C+
843 ZIPs Florida
B-
593 ZIPs Georgia
A
70 ZIPs Hawaii
C+
177 ZIPs Idaho
B
1,067 ZIPs Illinois
B
593 ZIPs Indiana
A-
547 ZIPs Iowa
B
374 ZIPs Kansas
B
339 ZIPs Kentucky
C+
493 ZIPs Louisiana
B+
128 ZIPs Maine
B-
191 ZIPs Maryland
B
448 ZIPs Massachusetts
B+
644 ZIPs Michigan
A-
566 ZIPs Minnesota
C+
398 ZIPs Mississippi
B
561 ZIPs Missouri
C+
143 ZIPs Montana
A-
274 ZIPs Nebraska
B
141 ZIPs Nevada
C
104 ZIPs New Hampshire
C-
196 ZIPs New Mexico
B+
323 ZIPs New York
C+
651 ZIPs North Carolina
A-
128 ZIPs North Dakota
B
763 ZIPs Ohio
C
525 ZIPs Oklahoma
C
305 ZIPs Oregon
C-
1,001 ZIPs Pennsylvania
B-
65 ZIPs Rhode Island
B+
286 ZIPs South Carolina
B+
151 ZIPs South Dakota
B+
525 ZIPs Tennessee
C+
1,952 ZIPs Texas
B-
206 ZIPs Utah
B
115 ZIPs Vermont
B
373 ZIPs Virginia
B-
414 ZIPs Washington
C
302 ZIPs West Virginia
B
557 ZIPs Wisconsin
C+
73 ZIPs Wyoming