Arizona Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), Arizona has 949 active community water systems in this extract. PlainEnviro's health-based slice lists 5,259 violation records across 50 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 949 community water systems in Arizona. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | Polacca Polacca | 223 | Yes |
| 2 | Shungopavi Second Mesa | 189 | Yes |
| 3 | WELLTON TOWN OF Wellton | 149 | Yes |
| 4 | PAPAGO BUTTE DWID Maricopa | 145 | Yes |
| 5 | COTTONWOOD MUNICIPAL WATER CW1 Cottonwood | 144 | Yes |
| 6 | ANTELOPE PEAK DWID Maricopa | 130 | Yes |
| 7 | Sipaulovi (Lower Sipaulovi/Lower Mishongnovi) Second Mesa | 126 | Yes |
| 8 | Seba Dalkai Boarding School BIA Winslow | 126 | Yes |
| 9 | Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) Second Mesa | 124 | Yes |
| 10 | Dilkon-Indian Wells-Greasewood-White Cone NTUA Fort Defiance | 105 | Yes |
| 11 | GW SAGUARO DIST WATER CO - RINCON Phoenix | 90 | Yes |
| 12 | VILLA GRANDE DWID Eloy | 86 | Yes |
| 13 | Toadlena NTUA Ft Defiance | 82 | Yes |
| 14 | NEW SADDLEBACK VISTA Maricopa | 77 | Yes |
| 15 | RANCH WATER SERVICE INC Kingman | 74 | Yes |
| 16 | SCUA Upper Seven Mile San Carlos | 72 | Yes |
| 17 | Aneth NTUA Ft Defiance | 71 | Yes |
| 18 | COTTONWOOD MUNICIPAL WATER VV3 Cottonwood | 60 | Yes |
| 19 | GREEN VALLEY MHP Flagstaff | 60 | Yes |
| 20 | THUNDERBIRD FARMS DWID Maricopa | 58 | Yes |
| 21 | SAN SIMON DWID San Simon | 56 | Yes |
| 22 | MARICOPA MOUNTAIN DWID 1 Maricopa | 54 | Yes |
| 23 | OAK CREEK WATER DISTRICT Sedona | 53 | Yes |
| 24 | WHITE HORSE RANCH OWNERS ASSOCIATION Prescott | 53 | Yes |
| 25 | CIBOLA WATER IMPROVEMENT DISTRICT | 53 | Yes |
| 26 | PINEDALE ESTATES DWID Lakeside | 48 | Yes |
| 27 | SIERRA PACIFIC MOBILE MANOR Yuma | 48 | Yes |
| 28 | Fort McDowell Community Fountain Hills | 46 | Yes |
| 29 | SIERRA VISTA RV PARK Casa Grande | 46 | Yes |
| 30 | CITY OF YUMA Yuma | 46 | Yes |
| 31 | EPCOR - LAKESIDE El Mirage | 45 | Yes |
| 32 | Mexican Water NTUA Ft Defiance | 44 | Yes |
| 33 | LAGOON ESTATES WC UNIT 2 Mohave Valley | 43 | Yes |
| 34 | EPCOR - MOOVALYA KEYS El Mirage | 43 | Yes |
| 35 | EPCOR - MARINA VILLAGE El Mirage | 39 | Yes |
| 36 | PAYSON WATER - EAST VERDE ESTATES Payson | 37 | Yes |
| 37 | EPCOR - PARKER DAM El Mirage | 37 | Yes |
| 38 | Sweetwater NTUA Ft Defiance | 37 | Yes |
| 39 | Hopi High School - BIA Keams Canyon | 35 | Yes |
| 40 | SUN LEISURE ESTATES IMPROVEMENT DISTRICT Yuma | 35 | Yes |
| 41 | Second Mesa Day School - BIA Second Mesa | 34 | Yes |
| 42 | SCUA Bylas San Carlos | 34 | Yes |
| 43 | BOUSE DWID Bouse | 34 | Yes |
| 44 | DESERT GARDENS RV RESORT CO-OP, INC Florence | 33 | Yes |
| 45 | WHISPERING WINDS APARTMENTS Chino Valley | 32 | Yes |
| 46 | SILVER CREEK RV PARK Bullhead City | 31 | Yes |
| 47 | BIG PARK WATER COMPANY Sedona | 29 | Yes |
| 48 | WENDEN DWID Wenden | 28 | Yes |
| 49 | Cameron NTUA Fort Defiance | 28 | Yes |
| 50 | JONES COOP WATER ASSOC Yuma | 27 | Yes |
Most Common Contaminants in Arizona
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Arsenic | 2,139 | 83 |
| Nitrate | 611 | 32 |
| TTHM | 549 | 31 |
| Groundwater Rule | 419 | 117 |
| Revised Total Coliform Rule | 342 | 111 |
| LEAD AND COPPER RULE REVISIONS | 248 | 166 |
| Fluoride | 208 | 9 |
| Interim Enhanced Surface Water Treatment Rule | 177 | 15 |
| Combined Uranium | 104 | 7 |
| CARBON, TOTAL | 66 | 5 |
| Surface Water Treatment Rule | 65 | 11 |
| Lead and Copper Rule | 48 | 21 |
| Selenium | 48 | 1 |
| Combined Radium (-226 and -228) | 47 | 4 |
| Chlorine dioxide | 44 | 1 |
Cities with Water Quality Issues
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in Arizona are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.