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Arizona Water Quality
1,493 public water systems serving 7,322,166 people.
Water Systems
1,493
Total Violations
228,944
Violation Rate
98.4%
PFAS Detection
95.4%
145 of 152 tested
Largest Water Systems
PHOENIX CITY OF
PHOENIX, AZ · 1,695,000 served
TUCSON CITY OF
TUCSON, AZ · 732,906 served
MESA CITY OF
MESA, AZ · 466,000 served
GILBERT, TOWN OF
GILBERT, AZ · 247,600 served
CHANDLER CITY OF
CHANDLER, AZ · 247,328 served
SCOTTSDALE CITY OF
SCOTTSDALE, AZ · 241,361 served
GLENDALE CITY OF
PHOENIX, AZ · 234,766 served
PEORIA CITY OF
PEORIA, AZ · 187,676 served
TEMPE CITY OF
TEMPE, AZ · 165,000 served
ARIZONA WATER CO - PINAL VALLEY
PHOENIX, AZ · 134,432 served
EPCOR - AGUA FRIA
EL MIRAGE, AZ · 127,718 served
CITY OF YUMA
YUMA, AZ · 103,264 served
QUEEN CREEK TOWN OF
QUEEN CREEK, AZ · 95,502 served
EPCOR - SAN TAN
SAN TAN VALLEY, AZ · 87,435 served
GW SANTA CRUZ WATER CO
MARICOPA, AZ · 84,000 served
AVONDALE CITY OF
AVONDALE, AZ · 83,001 served
FLAGSTAFF CITY OF
FLAGSTAFF, AZ · 76,960 served
ARIZONA WATER CO - APACHE JUNCTION
PHOENIX, AZ · 62,055 served
TOWN OF PRESCOTT VALLEY
DEWEY, AZ · 57,048 served
LAKE HAVASU CITY OF
LAKE HAVASU CITY, AZ · 54,610 served
Most Violations
#1 PUEBLO DEL SOL WATER COMPANY SIERRA VISTA
2,721 #2 BULLHEAD CITY MOHAVE BULLHEAD CITY
2,669 #3 PEORIA CITY OF PEORIA
2,461 #4 TUCSON CITY OF TUCSON
2,267 #5 ORO VALLEY WATER UTILITY ORO VALLEY
2,191 #6 BIG PARK WATER COMPANY SEDONA
2,033 #7 NOGALES CITY OF NOGALES
1,954 #8 FOOTHILLS WATER AND SEWER LLC YUMA
1,945 #9 MESA CITY OF MESA
1,739 #10 PAYSON TOWN OF PAYSON
1,716 #11 BELLA VISTA CITY WATER SYSTEM SIERRA VISTA
1,564 #12 BERMUDA WATER COMPANY INC FORT MOHAVE
1,469 #13 MOHAWK VALLEY SCHOOL DISTRICT ROLL
1,438 #14 ANTELOPE PEAK DWID MARICOPA
1,243 #15 GILBERT, TOWN OF GILBERT
1,235 Counties in Arizona
Maricopa
215 systems · 4,392,896 served
· 30,745 violations
Pima
195 systems · 1,138,545 served
· 30,465 violations
Pinal
94 systems · 505,241 served
· 20,790 violations
Mohave
119 systems · 231,271 served
· 20,586 violations
Yavapai
238 systems · 223,192 served
· 25,793 violations
Yuma
51 systems · 217,720 served
· 16,217 violations
Coconino
116 systems · 180,537 served
· 13,681 violations
Cochise
104 systems · 129,689 served
· 19,234 violations
Navajo
63 systems · 99,221 served
· 9,952 violations
Gila
103 systems · 62,233 served
· 15,775 violations
Santa Cruz
37 systems · 49,946 served
· 6,256 violations
La Paz
83 systems · 30,510 served
· 8,301 violations
Graham
16 systems · 29,739 served
· 3,328 violations
Apache
47 systems · 23,153 served
· 5,592 violations
Greenlee
11 systems · 8,173 served
· 2,184 violations