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CheckYourWater

PFAS Testing Results

Arizona

PFAS testing results for 152 water systems serving 6,809,771 residents.

Systems tested

152

37.5% had PFAS detections

Limits exceeded

25

16.4% of systems

Population affected

1.0M

served by systems over federal limits

Most common compound

11Cl-PF3OUdS

detected in 35 systems

Grade distribution

Every water system gets a letter grade based on how its worst detected PFAS compound compares to the federal Maximum Contaminant Level. Lower grades mean higher contamination.

A — 95 systems (62.5%)
B — 23 systems (15.1%)
C — 9 systems (5.9%)
D — 21 systems (13.8%)
F — 4 systems (2.6%)

How grades are calculated →

Communities exceeding federal limits

The water systems in Arizona where at least one PFAS compound exceeds the EPA Maximum Contaminant Level, sorted worst first.

System nameCityGradeWorst compoundTimes over limitPopulation
LIBERTY WATER RIO RICOSIERRA VISTA
PFOS7.4x18K
TEMPE CITY OFTEMPE
PFOS5.9x165K
MARANA MUNICIPAL - HARTMAN VISTASTUCSON
PFOS5.6x5.2K
BIG PARK WATER COMPANYSEDONA
PFOA5.3x7.4K
PAYSON TOWN OFPAYSON
PFOS4.8x18K
JOHNSON UTIL - ANTHEM AT MERRILL RANCHSAN TAN VALLEY
PFOA4.5x10K
MARANA MUNICIPAL - MARANAMARANA
PFOS4.5x15K
USAF LUKE AIR FORCE BASELUKE AFB
PFOS2.9x8.4K
PRESCOTT CITY OFPRESCOTT
PFOA2.7x42K
ARIZONA WATER CO - SEDONAPHOENIX
PFOA2.4x12K

Resources for taking action are available in our community toolkit.

What Arizona is doing about PFAS

As of April 2026, Arizona has not adopted state-level PFAS drinking water standards beyond the federal EPA limits finalized in April 2024. The Arizona Department of Environmental Quality has been tracking contamination near former military airfields in the Tucson and Luke Air Force Base areas, where AFFF firefighting foam releases have affected groundwater.

State records show the Tucson Airport Remediation Project has expanded to address PFAS alongside legacy solvent plumes. Water systems in Arizona remain on the federal compliance timeline requiring initial monitoring by 2027 and treatment installation by 2029.

Based on Arizona Department of Environmental Quality publications.

All 152 tested water systems in Arizona

Sorted from lowest grade to highest. Click any system name for the full report. Filter by city or name with the search box below.

Showing 50 of 152 systems

GradeSystem nameCityWorst compoundvs. EPA limitPopulation
LIBERTY WATER RIO RICOSIERRA VISTAPFOS7.4× the federal limit18K
TEMPE CITY OFTEMPEPFOS5.9× the federal limit165K
MARANA MUNICIPAL - HARTMAN VISTASTUCSONPFOS5.6× the federal limit5.2K
BIG PARK WATER COMPANYSEDONAPFOA5.3× the federal limit7.4K
PAYSON TOWN OFPAYSONPFOS4.8× the federal limit18K
JOHNSON UTIL - ANTHEM AT MERRILL RANCHSAN TAN VALLEYPFOA4.5× the federal limit10K
MARANA MUNICIPAL - MARANAMARANAPFOS4.5× the federal limit15K
USAF LUKE AIR FORCE BASELUKE AFBPFOS2.9× the federal limit8.4K
PRESCOTT CITY OFPRESCOTTPFOA2.7× the federal limit42K
ARIZONA WATER CO - SEDONAPHOENIXPFOA2.4× the federal limit12K
GLOBE CITY OFGLOBEPFOS2.4× the federal limit7.5K
LIBERTY WATER LPSCOLITCHFIELD PARKPFOS2.2× the federal limit51K
PHOENIX INTERNATIONAL RACEWAYAVONDALEPFOS2.1× the federal limit4.5K
GILBERT, TOWN OFGILBERTPFOS1.9× the federal limit248K
City of AvondaleAVONDALEPFOS1.9× the federal limit83K
GOODYEAR WATER DEPARTMENTGOODYEARPFOS1.9× the federal limit50K
ARIZONA WATER CO - BISBEEPHOENIXPFOA1.8× the federal limit8.7K
PONDEROSA PARK DWIDPRESCOTTPFOA1.8× the federal limit602
US ARMY FORT HUACHUCADRAGOONPFOA1.6× the federal limit16K
PEORIA CITY OFPEORIAPFOA1.4× the federal limit188K
EPCOR WATER - MOHAVEBULLHEAD CITYPFOA1.3× the federal limit36K
EPCOR WATER - NORTH MOHAVE VALLEYBULLHEAD CITYPFOS1.3× the federal limit5.2K
FLOWING WELLS IRRIGATION DISTRICTTUCSONPFOS1.3× the federal limit16K
FARMERS WATER CO SANTA RITA SPRINGSMARICOPAPFOS1.2× the federal limit4.0K
ARIZONA WATER CO - MIAMI CLAYPOOLPHOENIXPFHxS1.1× the federal limit8.7K
EL MIRAGE CITY OFEL MIRAGEPFOA1.0× the federal limit40K
MESA CITY OFMESAPFHxS84% of federal limit466K
ARIZONA WATER CO - PINAL VALLEYPHOENIXPFHxS58% of federal limit134K
VALLEY UTILITIES WATER COMPANY GLENDALEGLENDALEPFPeABelow detection5.9K
CHANDLER CITY OFCHANDLERPFBSBelow detection247K
BERMUDA WATER COMPANY INCFORT MOHAVEPFBSBelow detection25K
PONDEROSA DWIDPINETOPPFHxABelow detection5.4K
MARANA MUNICIPAL - PICTURE ROCKSTUCSONPFBABelow detection5.3K
UNIVERSITY OF ARIZONATUCSONPFPeABelow detection50K
FLORENCE WATER COMPANYFLORENCEPFHxS50% of federal limit16K
METROPOLITAN DWIDTUCSONPFHxSBelow federal limit46K
USMC YUMA MAIN SYSTEMYUMAPFHxSBelow federal limit6.3K
EAGAR TOWN OFEAGARPFBSBelow detection4.6K
ARIZONA WATER CO - SIERRA VISTAPHOENIXPFHxABelow detection9.2K
BELLA VISTA CITY WATER SYSTEMSIERRA VISTAPFPeABelow detection20K
FLAGSTAFF CITY OFFLAGSTAFFPFBABelow detection77K
GLEN CANYON NRA WAHWEAPPAGEPFBABelow detection4.4K
PINE STRAWBERRY DWIDPINEPFPeABelow detection8.0K
SAFFORD CITY OFSAFFORDPFBSBelow detection21K
MORENCI WATER ELEC CO MAINPHOENIXPFBSBelow detection4.1K
PHOENIX CITY OFPHOENIXPFBSBelow detection1.7M
GLENDALE CITY OFPHOENIXPFBSBelow detection235K
SCOTTSDALE CITY OFSCOTTSDALEPFBSBelow detection241K
TOLLESON CITY OFTOLLESONPFBSBelow detection9.3K
AZ Water Co. - White TanksPHOENIXPFBABelow detection19K

Check your water system

Enter your zip code to see the PFAS results for the water system that serves your home.

Where this data comes from

  • EPA Unregulated Contaminant Monitoring Rule, 5th cycle (UCMR 5)
  • Testing period: 2023 to 2026
  • Federal limits: EPA Maximum Contaminant Levels finalized April 2024
  • Read the full methodology