Pima County Water Quality
Arizona
According to EPA SDWIS, Pima County, Arizona hosts 120 community water systems covering about 283,633 people. The same extract lists 147 health-based violation records across 38 systems. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Pima County, Arizona hosts 120 EPA-regulated community water systems delivering drinking water to approximately 283,633 people. Each system is catalogued in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which mandates monitoring for dozens of regulated contaminants, public notification when standards are exceeded, and the issuance of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 147 violation records across these active community systems, with 38 systems carrying at least one record. The extract excludes monitoring and reporting violations. The county contains 13 incorporated places where these systems deliver service. 1 Superfund site is also listed within the county.
A historical health-based registry row does not establish water delivered today or describe current compliance. For current conditions, request the utility's most recent Consumer Confidence Report or contact the Arizona drinking water program. Figures shown here reflect only the health-based subset fetched from federal EPA SDWIS.
What water systems serve Pima County?
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| METROPOLITAN DWID | 45,570 | 0 | Clean |
| ORO VALLEY WATER UTILITY | 42,316 | 2 | Health |
| COMMUNITY WC OF GREEN VALLEY | 22,085 | 0 | Clean |
| USAF DAVIS MONTHAN AFB | 18,640 | 0 | Clean |
| SAHUARITA WATER COMPANY | 18,178 | 0 | Clean |
| VAIL WATER COMPANY | 17,500 | 0 | Clean |
| FLOWING WELLS IRRIGATION DISTRICT | 16,000 | 3 | Health |
| MARANA MUNICIPAL - MARANA | 15,162 | 0 | Clean |
| GREEN VALLEY DWID | 8,687 | 0 | Clean |
| AVRA WATER COOP INC | 6,685 | 0 | Clean |
| METROPOLITAN DWID - DIABLO VILLAGE | 5,542 | 0 | Clean |
| MARANA MUNICIPAL - PICTURE ROCKS | 5,278 | 0 | Clean |
| MARANA MUNICIPAL - HARTMAN VISTAS | 5,248 | 0 | Clean |
| MARANA MUNICIPAL - AIRLINE LAMBERT | 4,568 | 0 | Clean |
| ORO VALLEY WATER COUNTRYSIDE | 4,534 | 0 | Clean |
| ADOC TUCSON | 4,500 | 1 | Health |
| METROPOLITAN DWID - HUB | 4,252 | 0 | Clean |
| Sells Intertie | 4,000 | 0 | Clean |
| AJO IMPROVEMENT COMPANY | 2,654 | 0 | Clean |
| MARANA DWID - DERRINGER | 1,950 | 3 | Health |
| TOWN OF HUACHUCA CITY | 1,750 | 2 | Health |
| San Xavier West | 1,511 | 0 | Clean |
| Greater Santa Rosa Regional | 1,352 | 0 | Clean |
| Topawa Intertie | 1,318 | 0 | Clean |
| Vaya Chin Intertie | 1,151 | 0 | Clean |
| Mission View Mobile Home Park (Tucson Water Consec | 1,125 | 0 | Clean |
| RINCON COUNTRY EAST RV PARK | 912 | 0 | Clean |
| RANCHO DEL CONEJO COMM WATER COOP | 900 | 5 | Health |
| METROPOLITAN DWID - E&T SYSTEM | 880 | 0 | Clean |
| FAR HORIZONS EAST MHP | 870 | 0 | Clean |
| ORGAN PIPE NM HEADQUARTERS | 755 | 0 | Clean |
| MARANA MUNICIPAL - SILVERBELL GATEWAY | 750 | 0 | Clean |
| Covered Wells Regional | 740 | 0 | Clean |
| MISSION PALMS APARTMENTS | 720 | 0 | Clean |
| MARANA DWID - CULVER | 709 | 4 | Health |
| VISTA DEL NORTE MHP | 554 | 0 | Clean |
| COLDWATER CANYON 1 | 541 | 15 | Health |
| TRAILS WEST MHP | 500 | 0 | Clean |
| Pisinemo Intertie | 472 | 2 | Health |
| Kerwo Intertie | 441 | 0 | Clean |
| Chui Chu | 420 | 0 | Clean |
| CACTUS COUNTRY RV RESORT | 420 | 2 | Health |
| AJO DWID | 405 | 0 | Clean |
| WHY DWID | 400 | 11 | Health |
| San Xavier Ord (East) | 390 | 0 | Clean |
| DIAMOND GROVE MOBILE HOME ESTATES | 385 | 0 | Clean |
| FEDERAL CORRECTIONAL INST | 350 | 4 | Health |
| Little Tucson | 328 | 0 | Clean |
| SHILOH WATER COMPANY | 309 | 0 | Clean |
| VALLE VERDE DEL NORTE | 300 | 0 | Clean |
| MESALAND WATER COMPANY | 294 | 0 | Clean |
| MT LEMMON DWID | 290 | 0 | Clean |
| TOCC | 280 | 0 | Clean |
| RIO VIEJO WATER | 272 | 0 | Clean |
| RIO MERCADO WATER | 266 | 2 | Health |
| SIERRITA MOUNTAIN WATER COOP | 258 | 0 | Clean |
| FAR HORIZONS MHP | 258 | 0 | Clean |
| LA CHOLLA AIRPARK | 250 | 0 | Clean |
| COLDWATER CANYON 2 | 247 | 5 | Health |
| Comobabi Intertie | 240 | 2 | Health |
| DESERT SHORES RV MHP | 220 | 1 | Health |
| RIO VISTA MOBILE HOME PARK | 217 | 2 | Health |
| HALCYON ACRES WATER USERS ASSOCIATION | 215 | 0 | Clean |
| MARANA MUNICIPAL - TORTOLITA MOUNTAIN | 200 | 0 | Clean |
| CRESCENT MANOR MHP | 200 | 0 | Clean |
| CASITAS DE CASTILIAN | 167 | 4 | Health |
| Santa Rosa Ranch Intertie | 165 | 0 | Clean |
| RILLITO WATER USERS ASSOC | 165 | 2 | Health |
| PANTANO WATER COOP | 156 | 3 | Health |
| Kaka | 150 | 0 | Clean |
| MONTE VISTA WATER COMPANY | 150 | 25 | Health |
| ARIVACA TOWNSITE WATER COOP | 150 | 0 | Clean |
| SAMALAYUCA IMPROVEMENT ASSOC | 150 | 0 | Clean |
| DESERT WATER COOP | 150 | 1 | Health |
| NORTH LA CHOLLA MHP | 150 | 0 | Clean |
| RAINDANCE WATER COOP | 148 | 0 | Clean |
| San Pedro | 135 | 0 | Clean |
| RANCHO TIERRA BLANCA POA | 126 | 0 | Clean |
| Vamori | 125 | 0 | Clean |
| Cowlic | 120 | 0 | Clean |
| EMPIRITA WATER COMPANY | 120 | 1 | Health |
| COLDWATER CANYON 3 | 120 | 0 | Clean |
| MARANA MUNICIPAL - PALO VERDE | 118 | 0 | Clean |
| MOBILE HOME PROPERTIES | 114 | 0 | Clean |
| CATALINA VILLAGE | 107 | 0 | Clean |
| Fresnal | 105 | 0 | Clean |
| CROSSROADS PARK MHP | 100 | 2 | Health |
| KAHLUA WELL COOP | 99 | 2 | Health |
| SAHUARITA VILLAGE WATER COMPANY | 93 | 7 | Health |
| DESERT PARADISE MHP LLC | 90 | 1 | Health |
| Kohatk | 80 | 0 | Clean |
| Ventana | 80 | 0 | Clean |
| METROPOLITAN DWID - LAZY B | 77 | 0 | Clean |
| RINCON MESA LANDOWNERS | 75 | 2 | Health |
| RIVERSIDE APARTMENTS | 75 | 3 | Health |
| LAZY ACRES MHP | 75 | 0 | Clean |
| HIGH CHAPARRAL WATER COOP | 72 | 3 | Health |
| Charco 27 | 70 | 0 | Clean |
| New Fields | 67 | 0 | Clean |
| POCKETKNIFE WATER COOP | 65 | 0 | Clean |
| Queens Well | 64 | 0 | Clean |
| CAMMIES FOOTHILLS VISTA MHC | 62 | 0 | Clean |
| RANCHO SIERRITA WELL ASSOC | 55 | 2 | Health |
| PICACHO PEAK WATER COMPANY | 55 | 10 | Health |
| SHAE WATER COMPANY | 54 | 0 | Clean |
| PITA WATER COMPANY | 54 | 4 | Health |
| SUMMIT WATER COOP | 53 | 0 | Clean |
| WILDCAT ONE WELL COOP | 52 | 2 | Health |
| SIERRA COURT MHC LLC | 51 | 0 | Clean |
| PICO VISTA COMMUNITY WELL | 49 | 0 | Clean |
| SUPERSTITION WATER COOP | 45 | 0 | Clean |
| KLAFTER WELL COOP | 45 | 0 | Clean |
| SASABE BORDER VILLAGE | 42 | 0 | Clean |
| Gunsight (Schuchuligk) | 40 | 0 | Clean |
| Jackrabbit | 40 | 2 | Health |
| GARIGANS GULCH WATER COOP | 35 | 0 | Clean |
| WILMOT WATER USERS GROUP | 30 | 1 | Health |
| CORONADO FOREST DRIVE WATER COOP | 30 | 2 | Health |
| GATOR WATER COMPANY | 29 | 2 | Health |
| SIETE CASAS JOINT VENTURE | 25 | 0 | Clean |
Cities in Pima County
How does Pima County compare in Arizona?
Of the 15 Arizona counties with at least one community water system on file, Pima County ranks #3 by number of systems (120).
Either side of it: Maricopa County (177), Apache County (125), Yavapai County (77), Pinal County (74)
What are Pima County's health-based records for?
Pima County's health-based violation records carry 7 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results, and a historical record does not establish present water quality.
| Contaminant | Records | Systems |
|---|---|---|
| Arsenic | 55 | 5 |
| Revised Total Coliform Rule | 43 | 19 |
| Lead and Copper Rule Revisions | 29 | 14 |
| Groundwater Rule | 12 | 6 |
| Nitrate | 4 | 1 |
| Mercury | 2 | 1 |
| Combined Uranium | 2 | 1 |
Superfund Sites in Pima County
| Site Name | NPL Status | Site Score |
|---|---|---|
| Tucson International Airport Area | NPL Site | 57.80 |
About This Data
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
Figures here are the current EPA SDWIS extract joined to the 120 community water systems whose service area falls in Pima County, ranked against the 15 Arizona counties with at least one system on file. Data current as of 2026-08-25. Editorial standards, methodology, report an error.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
Read our methodology - how this data is sourced, computed, and verified.