| Public water system | Population served |
|---|---|
| PHOENIX CITY OF | 1,695,000 |
| TUCSON CITY OF | 732,906 |
| MESA CITY OF | 466,000 |
| GILBERT, TOWN OF | 247,600 |
| CHANDLER CITY OF | 247,328 |
| SCOTTSDALE CITY OF | 241,361 |
| GLENDALE CITY OF | 234,766 |
| PEORIA CITY OF | 187,676 |
| TEMPE CITY OF | 165,000 |
| CITY OF YUMA | 103,264 |
| AVONDALE CITY OF | 96,130 |
| FLAGSTAFF CITY OF | 79,796 |
| TOWN OF PRESCOTT VALLEY | 57,048 |
| LAKE HAVASU CITY OF | 54,610 |
| GOODYEAR WATER DEPARTMENT | 50,001 |
| KINGMAN MUNICIPAL WATER | 45,000 |
| ORO VALLEY WATER UTILITY | 42,316 |
| PRESCOTT CITY OF | 42,217 |
| SURPRISE CITY OF - MOUNTAIN VISTA | 40,007 |
| EL MIRAGE CITY OF | 39,884 |
| SAN LUIS CITY OF | 39,705 |
| DESERT OASIS | 23,963 |
| NOGALES CITY OF | 22,000 |
| SAFFORD CITY OF | 20,600 |
| USAF DAVIS MONTHAN AFB | 18,640 |
| PAYSON TOWN OF | 17,682 |
| CITY OF SHOW LOW | 17,139 |
| DOUGLAS CITY OF | 16,656 |
| GRAND CANYON NATIONAL PARK | 16,590 |
| FLORENCE WATER COMPANY | 15,900 |
| CITY OF BUCKEYE SONORA - SUNDANCE | 15,783 |
| APACHE JUNCTION WATER DISTRICT | 15,610 |
| US ARMY FORT HUACHUCA | 15,603 |
| SOMERTON CITY OF | 14,197 |
| TUCSON WATER CORONA DE TUCSON | 10,217 |
| CITY OF BUCKEYE TARTESSO WATER SYSTEM | 10,123 |
| WINSLOW CITY OF | 9,789 |
| TOLLESON CITY OF | 9,300 |
| USAF LUKE AIR FORCE BASE | 8,440 |
| USMC YUMA MAIN SYSTEM | 8,353 |
| ELOY CITY OF | 7,903 |
| GLOBE CITY OF | 7,536 |
| PAGE CITY OF | 7,420 |
| BUCKEYE CITY OF | 7,008 |
| WICKENBURG TOWN OF | 6,481 |
| SNOWFLAKE TOWN OF | 5,590 |
| BENSON, CITY OF WATER SYSTEM | 5,355 |
| MARANA MUNICIPAL - PICTURE ROCKS | 5,278 |
| MARANA MUNICIPAL - HARTMAN VISTAS | 5,248 |
| TOWN OF CAMP VERDE UTILITIES | 5,013 |
| EPCOR - TIERRA DEL RIO | 4,868 |
| HOLBROOK CITY OF | 4,833 |
| EAGAR TOWN OF | 4,590 |
| MARANA MUNICIPAL - AIRLINE LAMBERT | 4,568 |
| ORO VALLEY WATER COUNTRYSIDE | 4,534 |
| ADOC TUCSON | 4,500 |
| ASPC LEWIS COMPLEX WATER SYSTEM | 4,300 |
| ASPC YUMA | 4,197 |
| TOWN OF TAYLOR | 4,190 |
| ADOC EYMAN UNIT | 3,969 |
| AZ STATE PRISON - GEO GROUP - KINGMAN | 3,500 |
| KACHINA VILLAGE DWID | 3,500 |
| ST JOHNS CITY OF | 3,500 |
Largest first by population served, as each employer reports it to its federal registry.
Source: U.S. Environmental Protection Agency, Safe Drinking Water Information System (SDWIS/Fed), community water systems. Data captured October 2, 2026.
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