PlainEnviro

Maricopa County Water Quality

Arizona

Health Violations

According to EPA SDWIS, Maricopa County, Arizona hosts 177 community water systems covering about 2,029,737 people. The same extract lists 652 health-based violation records across 86 systems. Counts are historical EPA registry rows, not a current compliance or drinkability score.

177
Water Systems
2,029,737
Population Served
652
Health-Based Violation Records
86
Systems w/ Health Violations

Maricopa County, Arizona hosts 177 EPA-regulated community water systems delivering drinking water to approximately 2,029,737 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 652 violation records across these active community systems, with 86 systems carrying at least one record. The extract excludes monitoring and reporting violations. The county contains 34 incorporated places where these systems deliver service. 7 Superfund sites are 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 Maricopa County?

System Name Pop. Served Violations Status
GILBERT, TOWN OF 247,600 3 Health
SCOTTSDALE CITY OF 241,361 0 Clean
GLENDALE CITY OF 234,766 0 Clean
PEORIA CITY OF 187,676 2 Health
ARIZONA WATER CO - PINAL VALLEY 134,432 0 Clean
EPCOR - AGUA FRIA 127,718 3 Health
AVONDALE CITY OF 96,130 0 Clean
ARIZONA WATER CO - APACHE JUNCTION 62,055 0 Clean
LIBERTY WATER LPSCO 55,810 2 Health
GOODYEAR WATER DEPARTMENT 50,001 0 Clean
SURPRISE CITY OF - MOUNTAIN VISTA 40,007 0 Clean
EL MIRAGE CITY OF 39,884 0 Clean
EPCOR - SUN CITY 38,016 0 Clean
EPCOR - CHAPARRAL CITY 26,026 1 Health
EPCOR - SUN CITY WEST 25,796 0 Clean
DESERT OASIS 23,963 0 Clean
EPCOR - ANTHEM 23,826 2 Health
Salt River Public Works 20,951 2 Health
PIMA UTILITIES 20,000 4 Health
ARIZONA WATER CO - WHITE TANKS 18,858 0 Clean
LAGO DEL ORO WATER COMPANY 18,132 0 Clean
EPCOR - NORTH EAST AGUA FRIA 14,723 0 Clean
EPCOR - PARADISE VALLEY/SCOTTSDALE 14,107 0 Clean
ARIZONA WATER CO - OVERGAARD 13,797 0 Clean
ARIZONA WATER CO - LAKESIDE 12,191 0 Clean
ARIZONA WATER CO - SEDONA 12,104 2 Health
ARIZONA WATER CO - ORACLE 10,585 0 Clean
BEARDSLEY WATER COMPANY 1 10,263 0 Clean
TOLLESON CITY OF 9,300 0 Clean
ARIZONA WATER CO - SIERRA VISTA 9,175 3 Health
ARIZONA WATER CO - BISBEE 8,707 3 Health
ARIZONA WATER CO - MIAMI CLAYPOOL 8,656 3 Health
USAF LUKE AIR FORCE BASE 8,440 9 Health
ARIZONA WATER CO - PINEWOOD 8,089 0 Clean
SUNRISE WATER COMPANY 6,490 2 Health
WICKENBURG TOWN OF 6,481 0 Clean
VALLEY UTILITIES WATER COMPANY GLENDALE 5,940 0 Clean
CAVE CREEK WATER 5,895 8 Health
EPCOR- RIO VERDE 5,330 0 Clean
EPCOR - TIERRA DEL RIO 4,868 0 Clean
EPCOR - LAKE HAVASU 4,788 0 Clean
ARIZONA WATER CO - SAN MANUEL 4,748 3 Health
ARIZONA WATER CO - SUPERIOR 4,393 0 Clean
ASPC LEWIS COMPLEX WATER SYSTEM 4,300 3 Health
CORDES LAKES WATER COMPANY 4,257 3 Health
DESERT HILLS WATER 4,220 0 Clean
MORENCI WATER ELEC CO MAIN 4,108 21 Health
ADOC EYMAN UNIT 3,969 8 Health
CAREFREE WATER COMPANY 3,894 0 Clean
HOLLY LAKE RANCH 3,540 0 Clean
ARIZONA WATER CO - PINETOP LAKES 3,513 0 Clean
ARIZONA WATER CO - RIMROCK 3,423 3 Health
EPCOR - WILLOW VALLEY/KING STREET 3,408 2 Health
WICKENBURG RANCH ESTATES 2,877 0 Clean
PICACHO WATER COMPANY 2,440 0 Clean
CLEARWATER UTILITY COMPANY INC 2,175 3 Health
ARIZONA WATER CO - AJO 2,100 0 Clean
EPCOR - TUBAC 2,076 0 Clean
EAST SLOPE WATER COMPANY 1,980 0 Clean
GILA BEND TOWN OF 1,922 0 Clean
HORSESHOE BEND WATER SYSTEM 1,857 0 Clean
ARIZONA WATER CO - TIERRA GRANDE 1,796 3 Health
AWC - VALLEY VISTA 1,776 0 Clean
EPCOR - LAKESIDE 1,775 45 Health
FEDERAL CORRECTION INSTITUTION 1,500 7 Health
MESCAL LAKES WATER SYSTEM 1,390 4 Health
CLEAR SPRINGS UTILITY MAIN 1,385 3 Health
EPCOR - MOOVALYA KEYS 1,298 43 Health
LAKE GRIFFIN ISLES MHP (2 WTPS) 1,212 0 Clean
WEST END WATER COMPANY - WITTMAN 1,200 0 Clean
LIVCO WATER COMPANY 1,120 0 Clean
TRILLIUM WATER SYSTEM 1,100 0 Clean
BACA FLOAT WATER COMPANY 1,090 0 Clean
OAK CREST OF MANVEL 1,020 0 Clean
ADOC FLORENCE ASP 1,001 5 Health
ALPINE VILLAGE MHP 994 0 Clean
MOUNTAIN GLEN WATER SERVIC LINDEN TRAILS 975 0 Clean
AWC - CASA GRANDE WEST WATER COMPANY 943 3 Health
SANDARIO WATER COMPANY 870 3 Health
LONGHORN MEADOWS ADDITION 855 0 Clean
CIRCLE CITY - CITY OF SURPRISE 815 3 Health
PATTON PLACE ESTATES 795 0 Clean
WALNUT CREEK WATER COMPANY 728 0 Clean
YAVAPAI WATER COMPANY 728 0 Clean
THE MEADOWS 702 0 Clean
ADAMAN MUTUAL WATER COMPANY 700 5 Health
ADJC ADOBE MOUNTAIN SCHOOL 680 2 Health
GASLIGHT SQUARE MOBILE HOME PARK 675 0 Clean
NACO WATER CO MAIN 658 0 Clean
EAST SLOPE WATER - WEST 655 2 Health
Salt River Lehi 652 0 Clean
ARIZONA WATER CO - STANFIELD 639 3 Health
EPCOR - WILLOW VALLEY/LAKE CIMARRON 596 2 Health
PIONEER RV RESORT 583 0 Clean
EPCOR - HOLIDAY HARBOR 559 17 Health
EPCOR - MARINA VILLAGE 528 39 Health
SURPRISE, CITY OF BUENA VISTA 520 0 Clean
PEAK VIEW RANCH 508 0 Clean
ORANGEWOOD MOBILE HOME PARK 500 2 Health
SEDONA VENTURE WATER COMPANY 480 0 Clean
MEADOWLEA VILLAGE 472 0 Clean
ARIZONA TRAINING PROGRAM 470 5 Health
PARADISE MHP 460 2 Health
HILLCREST WATER COMPANY 454 0 Clean
ROOSEVELT RANCH RV & MHP 430 0 Clean
EPCOR - PARKER DAM 429 37 Health
ARIZONA WATER CO - WINKELMAN 424 0 Clean
MOBILE GARDENS DWID 400 2 Health
SAGUARO VIEW MGMT COMPANY 400 0 Clean
MICHIGAN TRAILER PARK 400 0 Clean
PICACHO PEAK RV RESORT 400 2 Health
Mille Lacs Island Resort 400 0 Clean
WILLOW MANOR MOBILE HOME PARK 375 1 Health
SUNRISE VILLAGE MHP 353 1 Health
WEKIVA FALLS RESORT 352 14 Health
TONTO HILLS DWID 350 0 Clean
OCEAN MOBILE HOME PARK 347 1 Health
SHANGRI LA RANCH 345 24 Health
LEISURE LAKE MOBILE ESTATES 325 0 Clean
DATELAND PUBLIC SERVICE CO 319 4 Health
QUAIL RUN WATER SYSTEM 300 0 Clean
COUNTRY HOME MHP 300 1 Health
HACIENDA DEL SOL MHP 300 1 Health
VENTURA RANCH DWID 300 1 Health
COUNTRYSIDE ESTATES MHP HAYS KS, LLC 300 0 Clean
SWEETWATER OAKS 240 0 Clean
GW SAGUARO DIST WATER CO - RINCON 232 90 Health
OATMAN WATER COMPANY 230 3 Health
EAGLE VIEW MHP 230 0 Clean
SUNLAND WATER COMPANY 227 12 Health
RANCHWOOD COMMUNITY 225 0 Clean
WEATHERSTONE LAKES MHP 221 0 Clean
VICKSBURG FARM 220 2 Health
CROWN KING WATER COMPANY 203 8 Health
ORANGE ACRES RANCH 200 5 Health
TONTO CREEK WATER COMPANY 190 1 Health
AWC - CASA GRANDE SOUTH WATER COMPANY 176 2 Health
TIMBER VILLAGE MOBILE HOME PK 176 0 Clean
SAGUARO ACRES CFD 175 1 Health
ADVANCE MHP 175 1 Health
SILVER CHOLLA LLC 168 0 Clean
MOUNTAIN VIEW MHP 160 0 Clean
NACO WATER CO BISBEE 138 0 Clean
MEADOW ACRES MHP HAYS KS, LLC 134 1 Health
APACHE MOBILE HOME AND RV PARK, LLC 130 13 Health
APACHE LAKE MARINA RESORT 123 6 Health
PALOMA RANCH 112 0 Clean
ENCHANTED LAKES ESTATES 107 0 Clean
DOUBLE ROCK ESTATES 105 0 Clean
Salt River North Mesa 100 0 Clean
PEEKABOO WATER COOP 100 7 Health
SIGNAL PEAK WATER COMPANY 99 0 Clean
DOUBLE R WATER DISTRIBUTORS, INC. 98 6 Health
BEARDSLEY WATER COMPANY 3 96 0 Clean
GILBERT RIGG WELL COOP 95 0 Clean
GARDENDALE MOBILE HOME AND RV PARK 93 26 Health
WHITE TANK WELL INC 87 0 Clean
TRIPLE G DAIRY 84 0 Clean
SONTEL WATER COOP 80 1 Health
EPCOR - RIO LINDO 79 25 Health
TWO TANKS COMMUNITY WELL 76 3 Health
BELMONT MOUNTAIN DAIRY 72 1 Health
BUCKEYE ACRES MHP 71 0 Clean
SWAN LAKE RESORT 70 4 Health
VALLEY VIEW WATER COMPANY 60 6 Health
SUNSET VALLEY MHP HAYS KS, LLC 60 2 Health
RANCHO WELLS INC 59 2 Health
WEST END WATER COMPANY - WHEAT 55 0 Clean
GREENFIELD RANCHETTES 53 12 Health
ASHLEY ROSE MHP 50 4 Health
GRANDVIEW WATER COMPANY 50 18 Health
CLEAR SPRINGS UTILITY WELL 6 48 3 Health
67 AVE PROPERTY OWNERS ASSOCIATION 40 2 Health
RIM COUNTRY ESTATES MHP 36 2 Health
MEADOW RANCH WATER SYSTEM 36 0 Clean
OLIVE AVENUE HOA 25 0 Clean
G LAZY B MOBILE HOME PARK 25 1 Health

Cities in Maricopa County

Phoenix
49 water systems
Mesa
2 water systems
Chandler
5 water systems
Tempe
5 water systems
Glendale
22 water systems
Goodyear
2 water systems
Buckeye
6 water systems
El Mirage
20 water systems
Tolleson
0 water systems
Scottsdale
20 water systems
Gilbert
9 water systems
Laveen
0 water systems
Peoria
4 water systems
Waddell
0 water systems
Litchfield Park
8 water systems
Sun City
3 water systems
Gila Bend
2 water systems
Avondale
1 water system
Fort Mcdowell
0 water systems
Surprise
9 water systems
Cave Creek
3 water systems
New River
2 water systems
Sun Lakes
2 water systems
Carefree
1 water system
Dateland
1 water system
Higley
1 water system
Luke Afb
1 water system
Roosevelt
1 water system
Scottdale
1 water system
Tonopah
1 water system
Wittman
1 water system
Wittmann
1 water system
Avondale, Goodyear
0 water systems
Hassayampa
0 water systems

How does Maricopa County compare in Arizona?

Of the 15 Arizona counties with at least one community water system on file, Maricopa County ranks #1 by number of systems (177).

Either side of it: Apache County (125), Pima County (120)

What are Maricopa County's health-based records for?

Maricopa County's health-based violation records carry 8 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
Interim Enhanced Surface Water Treatment Rule 104 6
Fluoride 90 1
Arsenic 69 13
Tthm 69 9
Surface Water Treatment Rule 60 6
Lead and Copper Rule Revisions 58 34
Revised Total Coliform Rule 53 16
Nitrate 39 5

Superfund Sites in Maricopa County

Site Name NPL Status Site Score
Hassayampa Landfill NPL Site 42.79
Indian Bend Wash Area NPL Site 42.24
Luke Air Force Base Deleted NPL Site 37.93
Motorola, Inc. (52nd Street Plant) NPL Site 40.83
Nineteenth Avenue Landfill Deleted NPL Site 54.27
Phoenix-Goodyear Airport Area NPL Site 45.91
Williams Air Force Base NPL Site 37.93

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 177 community water systems whose service area falls in Maricopa 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.

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Data sourced from the U.S. Environmental Protection Agency (EPA). See our methodology for details. Retrieved and formatted by PlainEnviro