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County Water Quality Directory

3,215 counties ranked. Tap a letter to browse.

A

117 counties
B
Abbeville, SC
3 cities
78.4
C
Acadia Parish, LA
7 cities
61.2
A-
Accomack, VA
5 cities
86.5
D+
Ada, ID
6 cities
53.6
A
Adair, IA
4 cities
90.8
A-
Adair, MO
2 cities
86.5
C+
Adair, OK
3 cities
65.2
C+
Adams, CO
9 cities
68.5
A
Adams, IA
2 cities
91.2
A-
Adams, ID
2 cities
86.4
A-
Adams, IL
9 cities
87.3
B+
Adams, IN
4 cities
81.2
B
Adams, MS
2 cities
78.9
A
Adams, ND
1 city
90.3
B+
Adams, NE
3 cities
81.9
B
Adams, OH
4 cities
76.8
C+
Adams, PA
10 cities
65.6
B-
Adams, WA
3 cities
73.1
B+
Adams, WI
4 cities
82.7
B+
Addison, VT
5 cities
84.4
F
Adjuntas Municipio, PR
1 city
44
F
Aguas Buenas Municipio, PR
2 cities
42.9
D+
Aibonito Municipio, PR
3 cities
53.2
B+
Aiken, SC
13 cities
82.7
A-
Aitkin, MN
2 cities
87.6
A-
Alachua, CO
1 city
87.7
B
Alachua, FL
8 cities
79.1
C+
Alamance, NC
8 cities
67.1
B
Alameda, CA
5 cities
78.3
D
Alamosa, CO
1 city
47.2
B+
Albany, NY
15 cities
83.2
C-
Albany, WY
1 city
55.2
F
Albemarle, VA
1 city
43.9
C+
Alcona, MI
1 city
65.3
C
Alcorn, MS
2 cities
63.1
D+
Aleutians East Borough, AK
2 cities
52.5
C
Aleutians West Census Area, AK
1 city
64
B+
Alexander, IL
4 cities
84.8
B+
Alexander, NC
2 cities
83
B+
Alfalfa, OK
2 cities
81.5
A
Alger, MI
1 city
91.4
A
Allamakee, IA
3 cities
90.3
C
Allegan, MD
1 city
60.8
B+
Allegan, MI
7 cities
80.3
B
Allegany, MD
4 cities
77.5
B
Allegany, NY
13 cities
75.2
B-
Alleghany, NC
2 cities
73.2
B+
Alleghany, VA
2 cities
80
B
Allegheny, PA
22 cities
75.9
B
Allen, IN
8 cities
79.9
B-
Allen, KS
4 cities
72
B+
Allen, KY
1 city
83.7
C+
Allen, OH
5 cities
68.7
B-
Allen Parish, LA
6 cities
71
B+
Allendale, SC
2 cities
80.2
C-
Alpena, MI
1 city
56.5
A-
Alpine, CA
2 cities
86.1
A-
Amador, CA
7 cities
85.1
A+
Amelia, VA
1 city
95
B
Amherst, VA
2 cities
78
B
Amite, MS
3 cities
78.9
C-
Anchorage Municipality, AK
6 cities
59.7
B+
Anderson, KS
3 cities
80.7
B
Anderson, KY
1 city
77.2
A-
Anderson, SC
9 cities
85.3
A-
Anderson, TN
4 cities
85.5
C
Anderson, TX
6 cities
63.5
A-
Andrew, MO
9 cities
87.2
D
Andrews, TX
1 city
45.2
B+
Androscoggin, ME
6 cities
84.1
D+
Angelina, TX
5 cities
54.5
B
Anne Arundel, MD
9 cities
79.3
A-
Anoka, MN
17 cities
88.5
B
Anson, NC
6 cities
75.2
A
Antelope, NE
2 cities
93
B+
Antrim, MI
4 cities
83.9
C-
Apache, AZ
6 cities
58.4
A-
Appanoose, IA
2 cities
87
A-
Appling, GA
1 city
88.8
A
Appomattox, VA
1 city
92.4
B-
Aransas, TX
1 city
72.9
D+
Arapahoe, CO
9 cities
53.2
A-
Archer, TX
3 cities
89.3
F
Archuleta, CO
1 city
42
C+
Arecibo Municipio, PR
3 cities
67.9
B
Arenac, MI
3 cities
77.5
B
Arkansas, AR
4 cities
75.4
B
Arlington, VA
1 city
78.2
C
Armstrong, PA
14 cities
61.4
C+
Armstrong, TX
1 city
67
B-
Aroostook, ME
12 cities
73.3
D
Arroyo Municipio, PR
2 cities
46.4
B
Ascension Parish, LA
2 cities
75.5
C-
Ashe, NC
3 cities
58
B+
Ashland, OH
4 cities
82.9
B
Ashland, WI
3 cities
75.6
B
Ashley, AR
5 cities
79.3
B
Ashtabula, OH
8 cities
78
A
Asotin, WA
2 cities
90.8
A-
Assumption Parish, LA
1 city
85
B-
Atascosa, TX
5 cities
73.2
B
Atchison, KS
3 cities
77.1
A
Atchison, MO
4 cities
93.7
B-
Athens, OH
7 cities
74.5
C+
Atkinson, GA
2 cities
65.3
B
Atlantic, NJ
17 cities
77.9
D+
Atoka, OK
3 cities
52.5
C
Attala, MS
5 cities
62.1
B
Audrain, MO
5 cities
79.9
A
Audubon, IA
2 cities
90.7
B-
Auglaize, OH
7 cities
72.9
A-
Augusta, VA
2 cities
87.5
A-
Aurora, SD
2 cities
85.3
B-
Austin, TX
4 cities
71.8
B
Autauga, AL
4 cities
75.7
D+
Avery, NC
3 cities
52.7
B
Avoyelles Parish, LA
11 cities
78.1
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