State drinking water records
Arizona drinking water systems
921 community water systems serve Arizona and are listed below under 15 counties and on the pages of 363 cities and towns. Their own population figures add up to 7,382,931 people, a sum that counts people twice where one system sells water to another.
424 of them (46%) had at least one health-based violation in the last 10 years. 411 systems still have one unresolved.
862 rely mainly on groundwater and 59 on surface water, counting water bought from other systems.
784 systems filed a lead service line inventory listing 5 lead lines, 2,404 galvanized lines that must be replaced and 726,481 lines of unknown material.
160 systems are placed by mailing address or by the county their records name: EPA has no service area map for 146 of them, and 14 have one that does not line up with their own records.
- Community water systems
- 921
- People served, sum of each system's own figure
- 7,382,931
- Systems with a health-based violation, last 10 years
- 424
- Systems with one unresolved
- 411
- Lead service lines in inventories
- 5
Counties
15 countiesEach county counts the systems whose service area map reaches it. Systems placed only by a mailing address are listed on the county pages but not counted here.
| County | Systems | People served | With a health-based violation, 10 years | With one unresolved |
|---|---|---|---|---|
| Apache County | 16 | 16,493 | 7 | 11 |
| Cochise County | 53 | 118,552 | 35 | 25 |
| Coconino County | 36 | 157,897 | 25 | 20 |
| Gila County | 47 | 66,774 | 23 | 22 |
| Graham County | 9 | 38,948 | 7 | 7 |
| Greenlee County | 6 | 7,471 | 4 | 2 |
| La Paz County | 22 | 29,251 | 16 | 8 |
| Maricopa County | 101 | 4,414,529 | 39 | 32 |
| Mohave County | 64 | 238,259 | 37 | 41 |
| Navajo County | 53 | 125,786 | 30 | 36 |
| Pima County | 148 | 1,090,747 | 35 | 36 |
| Pinal County | 60 | 605,464 | 39 | 22 |
| Santa Cruz County | 16 | 47,511 | 10 | 6 |
| Yavapai County | 105 | 210,829 | 43 | 44 |
| Yuma County | 30 | 213,511 | 25 | 16 |
Largest systems
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| City of Phoenix | Maricopa County | 1,695,000 | Surface water | 1 | 0 | 0 |
| City of Tucson | Pima County | 732,906 | Groundwater | 0 | 0 | 0 |
| City of Mesa | Maricopa County | 466,000 | Surface water | 0 | 0 | 0 |
| Town of Gilbert | Maricopa County | 247,600 | Surface water | 3 | 0 | 0 |
| City of Chandler | Maricopa County | 247,328 | Surface water | 1 | 0 | 0 |
| City of Scottsdale | Maricopa County | 241,361 | Surface water | 0 | 0 | 0 |
| City of Glendale | Maricopa County | 234,766 | Surface water | 0 | 0 | 0 |
| City of Peoria | Maricopa County | 187,676 | Surface water | 1 | 0 | 0 |
| City of Tempe | Maricopa County | 165,000 | Surface water | 2 | 0 | 0 |
| Arizona Water Co - Pinal Valley | Pinal County | 134,432 | Groundwater | 0 | 0 | 0 |
| Epcor - Agua Fria | Maricopa County | 127,718 | Surface water | 1 | 0 | 0 |
| City of Yuma | Yuma County | 103,264 | Surface water | 23 | 0 | 0 |
| Town of Queen Creek | Maricopa County and 1 other county | 95,502 | Groundwater | 0 | 0 | 0 |
| Epcor - San Tan | Pinal County | 87,435 | Groundwater | 2 | 0 | 0 |
| GW Santa Cruz Water Co | Pinal County | 84,000 | Groundwater | 1 | 0 | 0 |
Systems with unresolved health-based violations
411 systemsThe 100 with the most unresolved violations are listed. The county pages list the other 311.
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Jones Coop Water Assoc | Yuma County | 35 | Groundwater | 18 | 31 | No inventory |
| Big River Development | La Paz County | 3,550 | Groundwater | 3 | 12 | 0 |
| Hopi High School - BIA | Navajo County | 1,005 | Groundwater | 11 | 12 | 0 |
| Cibola Water Improvement District | La Paz County | 197 | Surface water | 30 | 11 | No inventory |
| Scua Upper Seven Mile | Gila County and 1 other county | 8,478 | Groundwater | 25 | 10 | 0 |
| Ganado Public Schools | Apache County | 684 | Groundwater | 0 | 9 | No inventory |
| Cienega Water Company Inc | La Paz County | 108 | Groundwater | 4 | 9 | No inventory |
| Hotevilla Village | Navajo County | 1,601 | Groundwater | 1 | 8 | 0 |
| Scua Lower Peridot Bush | Gila County | 342 | Groundwater | 6 | 8 | 0 |
| Big Park Water Company | Yavapai County | 7,392 | Groundwater | 7 | 7 | 0 |
| Utility Source LLC | Coconino County | 1,710 | Groundwater | 1 | 7 | No inventory |
| Sanders School District | Apache County | 350 | Groundwater | 7 | 7 | No inventory |
| Bouse DWID | La Paz County | 284 | Groundwater | 20 | 7 | No inventory |
| Crown King Water Company | Yavapai County | 203 | Groundwater | 3 | 7 | 0 |
| Majestic View Water Improvement District | Coconino County | 70 | Groundwater | 9 | 7 | 0 |
| Ojo Bonito Estates DWID | Apache County | 54 | Groundwater | 0 | 7 | 0 |
| 67 Ave Property Owners Association | Maricopa County | 40 | Groundwater | 2 | 7 | No inventory |
| Tsehootsooi Middle School | Apache County | 875 | Purchased groundwater | 0 | 6 | No inventory |
| Scua Lower Peridot | Gila County | 702 | Groundwater | 10 | 6 | 0 |
| Eden Water Company Inc | Graham County | 400 | Purchased groundwater | 1 | 6 | No inventory |
| Wonderland Acres DWID | Navajo County | 380 | Groundwater | 3 | 6 | 0 |
| Timberline MHP | Navajo County | 350 | Groundwater | 1 | 6 | No inventory |
| Porter Mountain DWID | Navajo County | 322 | Groundwater | 1 | 6 | No inventory |
| San Simon DWID | Cochise County | 312 | Groundwater | 38 | 6 | No inventory |
| Hunters Point Boarding School BIA | Apache County | 173 | Groundwater | 0 | 6 | 0 |
| Ponderosa Water, L.L.C | Gila County | 117 | Groundwater | 5 | 6 | 0 |
| Pine Water Association DWID | Gila County | 100 | Surface water | 2 | 6 | No inventory |
| Oak Creek Utility Corp | Coconino County | 72 | Groundwater | 1 | 6 | No inventory |
| Yuma West MHP | Yuma County | 30 | Groundwater | 2 | 6 | No inventory |
| City of Winslow | Navajo County | 9,789 | Groundwater | 0 | 5 | 0 |
| North Mohave Valley | Mohave County | 5,190 | Groundwater | 1 | 5 | 0 |
| Polacca | Navajo County | 3,890 | Purchased groundwater | 32 | 5 | 0 |
| Elfrida Wid | Cochise County | 800 | Groundwater | 6 | 5 | No inventory |
| Lake Mohave Highlands | Mohave County | 746 | Groundwater | 1 | 5 | 0 |
| Country Lane Trailer Park | Navajo County | 450 | Groundwater | 7 | 5 | No inventory |
| Town & Country - Preston | Santa Cruz County | 430 | Groundwater | 2 | 5 | No inventory |
| Sky Hi DWID | Navajo County | 390 | Groundwater | 2 | 5 | 0 |
| Rim Trail DWID | Gila County | 200 | Surface water | 10 | 5 | 0 |
| Willow Lakes Property Owners Assoc | Cochise County | 190 | Groundwater | 6 | 5 | No inventory |
| Green Valley MHP | Yavapai County | 190 | Groundwater | 23 | 5 | 0 |
| Verde Glen DWID | Gila County | 117 | Groundwater | 1 | 5 | No inventory |
| Twin Buttes RV, LLC | Cochise County | 79 | Groundwater | 2 | 5 | No inventory |
| Whispering Winds Apartments | Yavapai County | 60 | Groundwater | 12 | 5 | 0 |
| Misty Mountain DWID | Navajo County | 44 | Groundwater | 0 | 5 | 0 |
| Desert Winds Mobile Park | Cochise County | 34 | Groundwater | 1 | 5 | No inventory |
| Florence Water Company | Pinal County | 15,900 | Groundwater | 1 | 4 | 0 |
| Arizona Village | Mohave County | 3,211 | Purchased groundwater | 4 | 4 | 0 |
| White Mountain Summer Homes DWID | Navajo County | 1,233 | Groundwater | 0 | 4 | 0 |
| Granite Oaks Water Users Association | Yavapai County | 1,200 | Groundwater | 0 | 4 | 0 |
| Greasewood Springs Community Boarding School BIA | Navajo County | 720 | Groundwater | 0 | 4 | 0 |
| Scua Beverly Hills | Gila County | 612 | Groundwater | 4 | 4 | 0 |
| Sun Valley Farms Unit VI | Pinal County | 600 | Groundwater | 7 | 4 | 0 |
| Laguna Mobile Home and RV Park | Yuma County | 450 | Groundwater | 2 | 4 | No inventory |
| Scua Upper Peridot | Gila County | 275 | Groundwater | 5 | 4 | 0 |
| Porter Creek DWID | Navajo County | 250 | Groundwater | 1 | 4 | 0 |
| Rocky Ridge Boarding School BIA | Navajo County | 250 | Groundwater | 0 | 4 | 0 |
| Seba Dalkai Boarding School BIA | Navajo County | 250 | Purchased groundwater | 22 | 4 | 0 |
| Chinle Usd 24 Administration Center | Apache County | 220 | Groundwater | 0 | 4 | 0 |
| Antelope Water Company | Yuma County | 163 | Surface water | 1 | 4 | No inventory |
| Pine View RV Park | Gila County | 138 | Groundwater | 1 | 4 | 0 |
| G & L Mobile Park | Yuma County | 90 | Groundwater | 4 | 4 | No inventory |
| Mountain Vu RV Court | Yavapai County | 80 | Groundwater | 5 | 4 | No inventory |
| Two Tanks Community Well | Maricopa County | 76 | Groundwater | 3 | 4 | 0 |
| Trujillo Trail DWID | Santa Cruz County | 75 | Groundwater | 2 | 4 | No inventory |
| Softwinds Mobile Home Park | Yavapai County | 70 | Groundwater | 9 | 4 | 0 |
| Retreat at Oak Creek DWID | Yavapai County | 52 | Groundwater | 4 | 4 | 0 |
| A1 Ranch DWID | Coconino County | 45 | Groundwater | 0 | 4 | 0 |
| Avi Kwa Ame Farms North | Mohave County | 40 | Groundwater | 1 | 4 | 0 |
| Breezeway Trailer Park | Pinal County | 38 | Groundwater | 6 | 4 | No inventory |
| Pima Utilities | Maricopa County | 20,000 | Groundwater | 2 | 3 | 0 |
| Desert Foothills | Mohave County | 3,091 | Groundwater | 1 | 3 | 0 |
| Chandler Heights Citrus Irrigation Dist | Maricopa County | 2,620 | Groundwater | 0 | 3 | 0 |
| Forest Lakes Water Improvement District | Coconino County | 1,746 | Groundwater | 1 | 3 | No inventory |
| Katherine Landing DWTP | Mohave County | 1,300 | Surface water | 19 | 3 | 0 |
| Havasupai Village | Coconino County | 885 | Groundwater | 2 | 3 | 0 |
| Adoc Aspc Fort Grant | Graham County | 800 | Groundwater | 1 | 3 | 0 |
| Bradshaw Water Company Inc | Yavapai County | 510 | Groundwater | 0 | 3 | 0 |
| Lower Moencopi - Spring Source | Coconino County | 465 | Groundwater | 8 | 3 | 0 |
| Shepard Water Company | Yuma County | 430 | Groundwater | 14 | 3 | 0 |
| Granite Mountain Water Company | Yavapai County | 381 | Groundwater | 0 | 3 | 0 |
| Country Home MHP | Maricopa County | 300 | Groundwater | 1 | 3 | No inventory |
| Ventura Ranch Water System | Yavapai County | 300 | Groundwater | 1 | 3 | No inventory |
| White Horse Ranch Owners Association | Yavapai County | 292 | Groundwater | 34 | 3 | 0 |
| Little Park Water Company | Yavapai County | 264 | Groundwater | 1 | 3 | 0 |
| W Ranch Resort | Gila County | 200 | Groundwater | 1 | 3 | 0 |
| Seven Canyons of Sedona | Yavapai County | 195 | Groundwater | 0 | 3 | No inventory |
| Tonto Creek Water Company | Gila County | 190 | Groundwater | 1 | 3 | No inventory |
| The Grand Acres | Santa Cruz County | 153 | Groundwater | 1 | 3 | No inventory |
| Apache Acres MHP | Navajo County | 150 | Groundwater | 1 | 3 | 0 |
| Valley View MHC & RV Park | Greenlee County | 142 | Groundwater | 1 | 3 | 0 |
| Woodruff Domestic Water Company Inc | Navajo County | 140 | Groundwater | 3 | 3 | 0 |
| Pine Springs Day School BIA | Apache County | 122 | Groundwater | 0 | 3 | 0 |
| Heckethorn Water Company | Coconino County | 90 | Groundwater | 2 | 3 | No inventory |
| Aravaipa Water Company | Pinal County | 60 | Groundwater | 2 | 3 | 0 |
| Northern Section 4 Coop | Pinal County | 48 | Groundwater | 2 | 3 | 0 |
| Beaver Dam East DWID | Mohave County | 47 | Groundwater | 1 | 3 | 0 |
| Retaw Water Company | Navajo County | 47 | Groundwater | 0 | 3 | 0 |
| Davis Ranch Land Owners | Pinal County | 40 | Groundwater | 0 | 3 | 0 |
| Beaver Dam Filling Station | Mohave County | 35 | Groundwater | 2 | 3 | No inventory |
| La Costa Water Users Assoc | Cochise County | 30 | Groundwater | 2 | 3 | 0 |
Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations