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Updated 2026-10-15
County water report

Maricopa County Water Quality: 17 Cities Ranked by the Records

Maricopa County, Arizona: 17 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my systemOpen on the mapPrivate wells in Maricopa County
Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

LithiumDetected in 17 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest525 µg/L
Perfluorooctanesulfonic acid (PFOS)Detected in 4 systems of 17 tested4.0 ng/L federal MCL (2024) · US EPAHighest55.8 ng/L
  • City of Tempe55.8 ng/LSample date: 2023-07-13 to 2025-03-18
  • AVONDALE CITY OF11.7 ng/LSample date: 2024-04-17 to 2025-01-08
  • GILBERT, TOWN OF9.8 ng/LSample date: 2023-11-07 to 2024-11-05
  • GOODYEAR WATER DEPARTMENT7.9 ng/LSample date: 2023-07-20 to 2024-06-07
  • CHANDLER CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-10 to 2025-04-30
  • EL MIRAGE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-09-12 to 2024-05-23
  • EPCOR - AGUA FRIANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GLENDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • MESA CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-28 to 2025-11-12
  • PEORIA CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-11-20 to 2025-12-08
  • PHOENIX CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-01-03 to 2023-12-27
  • PIMA UTILITIESNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
Perfluorooctanoic acid (PFOA)Detected in 6 systems of 17 tested4.0 ng/L federal MCL (2024) · US EPAHighest38.7 ng/L
  • City of Tempe38.7 ng/LSample date: 2023-07-13 to 2025-03-18
  • AVONDALE CITY OF13.5 ng/LSample date: 2024-04-17 to 2025-01-08
  • GILBERT, TOWN OF6.5 ng/LSample date: 2023-11-07 to 2024-11-05
  • PEORIA CITY OF5.6 ng/LSample date: 2024-11-20 to 2025-12-08
  • GOODYEAR WATER DEPARTMENT4.8 ng/LSample date: 2023-07-20 to 2024-06-07
  • EL MIRAGE CITY OF4 ng/LSample date: 2023-09-12 to 2024-05-23
  • CHANDLER CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-10 to 2025-04-30
  • EPCOR - AGUA FRIANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GLENDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • MESA CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-28 to 2025-11-12
  • PHOENIX CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-01-03 to 2023-12-27
  • PIMA UTILITIESNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
Perfluorohexanesulfonic acid (PFHxS)Detected in 5 systems of 17 tested10 ng/L federal MCL (2024) · US EPAHighest70.5 ng/L
  • City of Tempe70.5 ng/LSample date: 2023-07-13 to 2025-03-18
  • AVONDALE CITY OF9.4 ng/LSample date: 2024-04-17 to 2025-01-08
  • MESA CITY OF9.3 ng/LSample date: 2023-02-28 to 2025-11-12
  • GOODYEAR WATER DEPARTMENT6.1 ng/LSample date: 2023-07-20 to 2024-06-07
  • PEORIA CITY OF3.7 ng/LSample date: 2024-11-20 to 2025-12-08
  • CHANDLER CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-07-10 to 2025-04-30
  • EL MIRAGE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-12 to 2024-05-23
  • EPCOR - AGUA FRIANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GILBERT, TOWN OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-07 to 2024-11-05
  • GLENDALE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • PHOENIX CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-03 to 2023-12-27
  • PIMA UTILITIESNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
Water hardnessDetected in 8 systemsAesthetic, no federal health limit · USGSHighest14.7 gpg
Total trihalomethanes (TTHM)Detected in 3 systems80 ppb federal MCL · US EPAHighest60 ppb
Lead (90th percentile)Detected in 7 systems of 17 tested15 µg/L federal action level · US EPAHighest10 µg/L
Perfluorononanoic acid (PFNA)Detected in 1 system of 17 tested10 ng/L federal MCL (2024) · US EPAHighest4.3 ng/L
  • GOODYEAR WATER DEPARTMENT4.3 ng/LSample date: 2023-07-20 to 2024-06-07
  • AVONDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-04-17 to 2025-01-08
  • CHANDLER CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-10 to 2025-04-30
  • City of TempeNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-13 to 2025-03-18
  • EL MIRAGE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-09-12 to 2024-05-23
  • EPCOR - AGUA FRIANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GILBERT, TOWN OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-07 to 2024-11-05
  • GLENDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • MESA CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-28 to 2025-11-12
  • PEORIA CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-11-20 to 2025-12-08
  • PHOENIX CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-01-03 to 2023-12-27
  • PIMA UTILITIESNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
7 more contaminants detectedShow
Haloacetic acids (HAA5)Detected in 3 systems60 ppb federal MCL · US EPAHighest25 ppb
Perfluorobutanesulfonic acid (PFBS)Detected in 11 systems of 17 tested2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest25.7 ng/L
Perfluorohexanoic acid (PFHxA)Detected in 6 systems of 17 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest22.5 ng/L
  • City of Tempe22.5 ng/LSample date: 2023-07-13 to 2025-03-18
  • AVONDALE CITY OF12.9 ng/LSample date: 2024-04-17 to 2025-01-08
  • EL MIRAGE CITY OF6 ng/LSample date: 2023-09-12 to 2024-05-23
  • GILBERT, TOWN OF4.4 ng/LSample date: 2023-11-07 to 2024-11-05
  • CHANDLER CITY OF3.5 ng/LSample date: 2023-07-10 to 2025-04-30
  • MESA CITY OF3.2 ng/LSample date: 2023-02-28 to 2025-11-12
  • EPCOR - AGUA FRIANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GLENDALE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • GOODYEAR WATER DEPARTMENTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-07-20 to 2024-06-07
  • PEORIA CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-20 to 2025-12-08
  • PHOENIX CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-03 to 2023-12-27
  • PIMA UTILITIESNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
Perfluorobutanoic acid (PFBA)Detected in 5 systems of 17 testedNo federal or state limit; shown for transparencyHighest9.9 ng/L
  • City of Tempe9.9 ng/LSample date: 2023-07-13 to 2025-03-18
  • AVONDALE CITY OF6.5 ng/LSample date: 2024-04-17 to 2025-01-08
  • PHOENIX CITY OF6 ng/LSample date: 2023-01-03 to 2023-12-27
  • GILBERT, TOWN OF5.8 ng/LSample date: 2023-11-07 to 2024-11-05
  • CHANDLER CITY OF5 ng/LSample date: 2023-07-10 to 2025-04-30
  • EL MIRAGE CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-09-12 to 2024-05-23
  • EPCOR - AGUA FRIANot detected · below 5.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GLENDALE CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • GOODYEAR WATER DEPARTMENTNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-07-20 to 2024-06-07
  • MESA CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2023-02-28 to 2025-11-12
  • PEORIA CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-11-20 to 2025-12-08
  • PIMA UTILITIESNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 5.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
Perfluoroheptanoic acid (PFHpA)Detected in 2 systems of 17 testedNo federal or state limit; shown for transparencyHighest7 ng/L
  • City of Tempe7 ng/LSample date: 2023-07-13 to 2025-03-18
  • AVONDALE CITY OF3.7 ng/LSample date: 2024-04-17 to 2025-01-08
  • CHANDLER CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-07-10 to 2025-04-30
  • EL MIRAGE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-09-12 to 2024-05-23
  • EPCOR - AGUA FRIANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GILBERT, TOWN OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-07 to 2024-11-05
  • GLENDALE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • GOODYEAR WATER DEPARTMENTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-07-20 to 2024-06-07
  • MESA CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-28 to 2025-11-12
  • PEORIA CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-20 to 2025-12-08
  • PHOENIX CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-03 to 2023-12-27
  • PIMA UTILITIESNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
Perfluoropentanesulfonic acid (PFPeS)Detected in 1 system of 17 testedNo federal or state limit; shown for transparencyHighest8 ng/L
  • City of Tempe8 ng/LSample date: 2023-07-13 to 2025-03-18
  • AVONDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-04-17 to 2025-01-08
  • CHANDLER CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-10 to 2025-04-30
  • EL MIRAGE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-09-12 to 2024-05-23
  • EPCOR - AGUA FRIANot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GILBERT, TOWN OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-11-07 to 2024-11-05
  • GLENDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • GOODYEAR WATER DEPARTMENTNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-07-20 to 2024-06-07
  • MESA CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-02-28 to 2025-11-12
  • PEORIA CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-11-20 to 2025-12-08
  • PHOENIX CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-01-03 to 2023-12-27
  • PIMA UTILITIESNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
Perfluoropentanoic acid (PFPeA)Detected in 6 systems of 17 testedNo federal or state limit; shown for transparencyHighest17.2 ng/L
  • AVONDALE CITY OF17.2 ng/LSample date: 2024-04-17 to 2025-01-08
  • City of Tempe14.4 ng/LSample date: 2023-07-13 to 2025-03-18
  • EL MIRAGE CITY OF10 ng/LSample date: 2023-09-12 to 2024-05-23
  • GILBERT, TOWN OF6.2 ng/LSample date: 2023-11-07 to 2024-11-05
  • CHANDLER CITY OF5.3 ng/LSample date: 2023-07-10 to 2025-04-30
  • GOODYEAR WATER DEPARTMENT3.7 ng/LSample date: 2023-07-20 to 2024-06-07
  • EPCOR - AGUA FRIANot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-14 to 2024-11-07
  • EPCOR - ANTHEMNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-11-06 to 2024-08-01
  • EPCOR - CHAPARRAL CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-12 to 2024-11-01
  • EPCOR - SUN CITYNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-18 to 2023-10-17
  • EPCOR - SUN CITY WESTNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-03-07 to 2023-09-12
  • GLENDALE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-03 to 2025-03-03
  • MESA CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-02-28 to 2025-11-12
  • PEORIA CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-11-20 to 2025-12-08
  • PHOENIX CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-01-03 to 2023-12-27
  • PIMA UTILITIESNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-12-10 to 2025-09-10
  • SCOTTSDALE CITY OFNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-12-01
19 PFAS tested, none detected in any systemShow

Tested in these 17 systems: AVONDALE CITY OF, CHANDLER CITY OF, City of Tempe, EL MIRAGE CITY OF, EPCOR - AGUA FRIA, EPCOR - ANTHEM, EPCOR - CHAPARRAL CITY, EPCOR - SUN CITY, EPCOR - SUN CITY WEST, GILBERT, TOWN OF, GLENDALE CITY OF, GOODYEAR WATER DEPARTMENT, MESA CITY OF, PEORIA CITY OF, PHOENIX CITY OF, PIMA UTILITIES, SCOTTSDALE CITY OF

  • 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
  • 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
  • 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
  • 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
  • 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
  • Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
  • N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
  • N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
  • Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
  • Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
  • Perfluoro-3-methoxypropanoic acid (PFMPA)
  • Perfluoro-4-methoxybutanoic acid (PFMBA)
  • Perfluorodecanoic acid (PFDA)
  • Perfluorododecanoic acid (PFDoA)
  • Perfluoroheptanesulfonic acid (PFHpS)
  • Perfluorotetradecanoic acid (PFTA)
  • Perfluorotridecanoic acid (PFTrDA)
  • Perfluoroundecanoic acid (PFUnA)
17 cities

Cities ranked by the records

Showing 6 of 17 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Maricopa County5 of 17 city reports had a PFAS sample above a 2024 EPA limit
  1. Tempe55.8 ng/L
  2. Avondale11.7 ng/L
  3. Gilbert9.8 ng/L
  4. Goodyear7.9 ng/L
4.0 ng/L federal MCL · PFOS, ng/LPFAS in Arizona
Lead

0of 17 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Arizona
Hard water

8cities report hardness · hardest Phoenix, 14.7 gpg

8 of 8 are hard on the USGS scale. An aesthetic measure with no federal health limit.

Hard water explained
Who supplies the county

Largest water systems

  1. PhoenixPHOENIX CITY OF · AZ0407025
    1,695,000 served
  2. MesaMESA CITY OF · AZ0407095
    466,000 served
  3. GilbertGILBERT, TOWN OF · AZ0407092
    247,600 served
  4. ChandlerCHANDLER CITY OF · AZ0407090
    247,328 served
  5. ScottsdaleSCOTTSDALE CITY OF · AZ0407098
    241,361 served
  6. GlendaleGLENDALE CITY OF · AZ0407093
    234,766 served
  7. PeoriaPEORIA CITY OF · AZ0407096
    187,676 served
  8. TempeTEMPE CITY OF · AZ0407100
    165,000 served
  9. SurpriseEPCOR - AGUA FRIA · AZ0407695
    128,040 served
  10. AvondaleAVONDALE CITY OF · AZ0407088
    96,130 served
Questions

Frequently asked

How does Maricopa County tap water compare across cities?

PurityMap ranks 17 cities in Maricopa County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Sun City's main water system: EPCOR - SUN CITY · PWSID AZ0407099 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Maricopa County cities had a PFAS sample above a 2024 EPA limit?

5 of 17 Maricopa County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Tempe (PFOS 55.8 ng/L), Avondale (PFOA 13.5 ng/L), Gilbert (PFOS 9.8 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 11.

Is there lead in Maricopa County tap water?

Utilities report lead as a 90th-percentile result from home taps. 7 of 17 Maricopa County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Have Maricopa County water systems had drinking-water violations?

2 cities in Maricopa County have a health-based violation in the federal SDWIS record within about the last ten years. Each city report lists the contaminant, year and whether it was resolved.

Does Maricopa County have hard water?

Hardness is published in utility water-quality reports for 8 Maricopa County cities on record; the hardest is Phoenix at 14.7 grains per gallon. Hardness affects scale and appliances; it is not a health finding.

Next step

Follow Maricopa County's water

Get an email when a city record in the county changes. Or go straight to the filters certified for what was found here.

Filters certified for PFAS
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