State rankings
Arizona water-system rankings
Lowest-scoring systems in Arizona
Ranked lowest score first. Population shown for context.
1 MARANA MUNICIPAL - MARANA MARANA, AZ · ~15,162 served 12 2 PAYSON TOWN OF PAYSON, AZ · ~17,682 served 28 3 USAF LUKE AIR FORCE BASE LUKE AFB, AZ · ~8,440 served 30 4 PRESCOTT CITY OF PRESCOTT, AZ · ~42,217 served 34 5 GLOBE CITY OF GLOBE, AZ · ~7,536 served 34 6 AVONDALE CITY OF AVONDALE, AZ · ~83,001 served 39 7 LIBERTY WATER LPSCO LITCHFIELD PARK, AZ · ~55,810 served 40 8 GILBERT, TOWN OF GILBERT, AZ · ~247,600 served 43 9 BIG PARK WATER COMPANY SEDONA, AZ · ~7,392 served 43 10 LIBERTY WATER RIO RICO SIERRA VISTA, AZ · ~17,960 served 44 11 US ARMY FORT HUACHUCA DRAGOON, AZ · ~15,603 served 46 12 MARANA MUNICIPAL - HARTMAN VISTAS TUCSON, AZ · ~5,248 served 47 13 TEMPE CITY OF TEMPE, AZ · ~165,000 served 48 14 BULLHEAD CITY MOHAVE BULLHEAD CITY, AZ · ~36,330 served 52 15 GOODYEAR WATER DEPARTMENT GOODYEAR, AZ · ~50,001 served 53 16 ARIZONA WATER CO - SEDONA PHOENIX, AZ · ~12,104 served 56 17 PONDEROSA PARK DWID PRESCOTT, AZ · ~602 served 59 18 SCUA Upper Seven Mile San Carlos, AZ · ~8,478 served 60 19 Big River Development Parker, AZ · ~3,550 served 60 20 Hopi High School - BIA Keams Canyon, AZ · ~1,005 served 60 21 SCUA Lower Peridot San Carlos, AZ · ~702 served 60 22 SCUA Beverly Hills San Carlos, AZ · ~612 served 60 23 SCUA Lower Peridot Bush San Carlos, AZ · ~342 served 60 24 GHR LANDOWNERS ASSN WATER COOP BULLHEAD CITY, AZ · ~280 served 60 25 SCUA Upper Peridot San Carlos, AZ · ~275 served 60
Highest-scoring large systems in Arizona
Systems serving 10,000+ people with the best scores.
1 PHOENIX CITY OF PHOENIX, AZ · ~1,695,000 served 100 2 TUCSON CITY OF TUCSON, AZ · ~732,906 served 100 3 CHANDLER CITY OF CHANDLER, AZ · ~247,328 served 100 4 SCOTTSDALE CITY OF SCOTTSDALE, AZ · ~241,361 served 100 5 GLENDALE CITY OF PHOENIX, AZ · ~234,766 served 100 6 EPCOR - AGUA FRIA EL MIRAGE, AZ · ~127,718 served 100 7 CITY OF YUMA YUMA, AZ · ~103,264 served 100 8 QUEEN CREEK TOWN OF QUEEN CREEK, AZ · ~95,502 served 100
Scores reflect EPA public records (violations, enforcement, PFAS), are system-level, and can’t account for your home’s plumbing. See the methodology.