Arizona Water Quality
Health violation data for 956 community water systems in Arizona. Based on EPA Safe Drinking Water Information System (SDWIS) data.
Water Systems
956
Total Violations
4,821
Systems with Violations
50
Cities with Issues
144
Water Systems with Most Violations
| # | Water System | Violations | Health |
|---|---|---|---|
| 1 | Polacca Polacca | 172 | Yes |
| 2 | Shungopavi Second Mesa | 149 | Yes |
| 3 | COTTONWOOD MUNICIPAL WATER CW1 Cottonwood | 144 | Yes |
| 4 | PAPAGO BUTTE DWID Maricopa | 141 | Yes |
| 5 | WELLTON TOWN OF Wellton | 136 | Yes |
| 6 | ANTELOPE PEAK DWID Maricopa | 130 | Yes |
| 7 | Seba Dalkai Boarding School BIA Winslow | 126 | Yes |
| 8 | Mishongnovi (Upper Sipaulovi/Upper Mishongnovi) Second Mesa | 124 | Yes |
| 9 | Dilkon-Indian Wells-Greasewood-White Cone NTUA Fort Defiance | 105 | Yes |
| 10 | GW SAGUARO DIST WATER CO - RINCON Phoenix | 89 | Yes |
| 11 | VILLA GRANDE DWID Eloy | 85 | Yes |
| 12 | Toadlena NTUA Ft Defiance | 81 | Yes |
| 13 | RANCH WATER SERVICE INC Kingman | 74 | Yes |
| 14 | NEW SADDLEBACK VISTA Maricopa | 74 | Yes |
| 15 | Aneth NTUA Ft Defiance | 71 | Yes |
| 16 | SCUA Upper Seven Mile San Carlos | 62 | Yes |
| 17 | COTTONWOOD MUNICIPAL WATER VV3 Cottonwood | 60 | Yes |
| 18 | THUNDERBIRD FARMS DWID Maricopa | 58 | Yes |
| 19 | GREEN VALLEY MHP Flagstaff | 56 | Yes |
| 20 | SAN SIMON DWID San Simon | 53 | Yes |
| 21 | OAK CREEK WATER DISTRICT Sedona | 53 | Yes |
| 22 | MARICOPA MOUNTAIN DWID 1 Maricopa | 52 | Yes |
| 23 | WHITE HORSE RANCH OWNERS ASSOCIATION Prescott | 49 | Yes |
| 24 | CIBOLA WATER IMPROVEMENT DISTRICT Tucson | 49 | Yes |
| 25 | SIERRA PACIFIC MOBILE MANOR Yuma | 47 | Yes |
| 26 | PINEDALE ESTATES DWID Lakeside | 46 | Yes |
| 27 | SIERRA VISTA RV PARK Casa Grande | 46 | Yes |
| 28 | CITY OF YUMA Yuma | 46 | Yes |
| 29 | Fort McDowell Community Fountain Hills | 45 | Yes |
| 30 | EPCOR - LAKESIDE El Mirage | 45 | Yes |
| 31 | Mexican Water NTUA Ft Defiance | 44 | Yes |
| 32 | EPCOR - MOOVALYA KEYS El Mirage | 43 | Yes |
| 33 | LAGOON ESTATES WC UNIT 2 Mohave Valley | 41 | Yes |
| 34 | EPCOR - MARINA VILLAGE El Mirage | 39 | Yes |
| 35 | EPCOR - PARKER DAM El Mirage | 37 | Yes |
| 36 | Sweetwater NTUA Ft Defiance | 37 | Yes |
| 37 | SUN LEISURE ESTATES IMPROVEMENT DISTRICT Yuma | 34 | Yes |
| 38 | SCUA Bylas San Carlos | 32 | Yes |
| 39 | DS WATER COMPANY Desert Springs, | 32 | Yes |
| 40 | BOUSE DWID Bouse | 32 | Yes |
| 41 | DESERT GARDENS RV RESORT CO-OP, INC Florence | 31 | Yes |
| 42 | SILVER CREEK RV PARK Bullhead City | 30 | Yes |
| 43 | WHISPERING WINDS APARTMENTS Chino Valley | 29 | Yes |
| 44 | WENDEN DWID Wenden | 28 | Yes |
| 45 | Cameron NTUA Fort Defiance | 28 | Yes |
| 46 | PAYSON WATER - EAST VERDE ESTATES Payson | 27 | Yes |
| 47 | BIG PARK WATER COMPANY Sedona | 27 | Yes |
| 48 | Fort Defiance-Window Rock-St Michaels NTUA Ft Defiance | 27 | Yes |
| 49 | FOOTHILLS UTILITIES KINGMAN EAST Yuma | 26 | Yes |
| 50 | JONES COOP WATER ASSOC Yuma | 26 | Yes |
Most Common Contaminants in Arizona
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Barium | 1,908 | 80 |
| Nitrate | 581 | 31 |
| Total Trihalomethanes (TTHM) | 542 | 31 |
| Fluoride | 353 | 110 |
| E. coli | 337 | 111 |
| Manganese | 199 | 9 |
| Gross Alpha | 190 | 167 |
| Turbidity | 166 | 15 |
| Lead (Action Level) | 103 | 7 |
| Arsenic | 65 | 11 |
| Chloroform | 64 | 5 |
| Combined Radium 226/228 | 47 | 20 |
| Lead & Copper Rule | 47 | 4 |
| Thallium | 46 | 1 |
| Contaminant 1008 | 44 | 1 |
Cities with Water Quality Issues
Phoenix Coolidge Florence Eloy Queen Creek Sacaton Casa Grande Scottsdale Mesa Apache Junction Chandler Hayden Kearny Maricopa Gilbert Buckeye Tempe Glendale El Mirage Goodyear Litchfield Park Parker Yuma Peoria Globe Safford Saint David Sahuarita Patagonia Nogales Marana Rillito Tucson Springerville Flagstaff Grand Canyon Holbrook Page Prescott Bagdad +104 more
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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 U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.