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CheckYourWater

PFAS Testing Results

Oklahoma

PFAS testing results for 166 water systems serving 3,020,987 residents.

Systems tested

166

36.7% had PFAS detections

Limits exceeded

13

7.8% of systems

Population affected

355K

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 — 105 systems (63.3%)
B — 38 systems (22.9%)
C — 10 systems (6.0%)
D — 10 systems (6.0%)
F — 3 systems (1.8%)

How grades are calculated →

Communities exceeding federal limits

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

System nameCityGradeWorst compoundTimes over limitPopulation
KAY CO RWD #5 (DALE WATER CORP)NEWKIRK
PFOS5.8x765
WAGONER CO. RWD #4BROKEN ARROW
PFOS5.6x26K
WAGONER CO. RWD #5COWETA
PFOS5.1x4.3K
MAYES CO RWD # 2CHOUTEAU
PFOS4.4x6.3K
BROKEN ARROW MUNICIPAL AUTHORITYBROKEN ARROW
PFOS4.2x116K
NOWATA MUNICIPAL AUTHORITYNOWATA
PFOS1.9x4.0K
PONCA CITY MUN WATERPONCA CITY
PFOS1.7x27K
TRI-COUNTY RWD #2EARLSBORO
PFHxS1.6x5.2K
STILLWATER WATER PLANTSTILLWATER
PFOS1.5x53K
OKLA ORDNANCE WORKS AUTHORITYPRYOR
PFOS1.4x4.0K

Resources for taking action are available in our community toolkit.

What Oklahoma is doing about PFAS

As of April 2026, Oklahoma has not adopted state-level PFAS drinking water standards beyond the federal EPA limits finalized in April 2024. The Oklahoma Department of Environmental Quality has tracked contamination near Tinker Air Force Base in Midwest City and Vance Air Force Base near Enid.

Public water systems in Oklahoma are subject to the federal compliance timeline requiring initial monitoring by 2027 and treatment installation by 2029.

Based on Oklahoma Department of Environmental Quality publications.

All 166 tested water systems in Oklahoma

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 166 systems

GradeSystem nameCityWorst compoundvs. EPA limitPopulation
KAY CO RWD #5 (DALE WATER CORP)NEWKIRKPFOS5.8× the federal limit765
WAGONER CO. RWD #4BROKEN ARROWPFOS5.6× the federal limit26K
WAGONER CO. RWD #5COWETAPFOS5.1× the federal limit4.3K
MAYES CO RWD # 2CHOUTEAUPFOS4.4× the federal limit6.3K
BROKEN ARROW MUNICIPAL AUTHORITYBROKEN ARROWPFOS4.2× the federal limit116K
NOWATA MUNICIPAL AUTHORITYNOWATAPFOS1.9× the federal limit4.0K
PONCA CITY MUN WATERPONCA CITYPFOS1.7× the federal limit27K
TRI-COUNTY RWD #2EARLSBOROPFHxS1.6× the federal limit5.2K
STILLWATER WATER PLANTSTILLWATERPFOS1.5× the federal limit53K
OKLA ORDNANCE WORKS AUTHORITYPRYORPFOS1.4× the federal limit4.0K
EDMOND PWA - ARCADIAEDMONDPFOS1.3× the federal limit79K
BETHANYBETHANYPFOS1.2× the federal limit20K
LOGAN CO RWD #1GUTHRIEPFOA1.1× the federal limit8.9K
NOBLENOBLEPFHxS65% of federal limit5.8K
TINKER AFB BIO-ENV ENGOKLAHOMA CITYPFHxS51% of federal limit25K
DUNCAN PUBLIC UTILITIES AUTHORITYDUNCANPFBABelow detection23K
SOUTHERN OKLA WATER CORPARDMORE6:2FTSBelow detection11K
DEL CITYDEL CITYPFBABelow detection22K
GUTHRIEGUTHRIEPFBABelow detection9.9K
TAHLEQUAH PWATAHLEQUAHPFBSBelow detection14K
CHEROKEE CO. RWD #11HULBERTPFHxABelow detection3.4K
PIEDMONT MUNICPAL AUTHORITYPIEDMONTPFBABelow detection7.5K
TUTTLETUTTLEPFBSBelow detection4.5K
COWETACOWETAPFHxSBelow federal limit9.4K
ALTUSALTUSPFHxSBelow federal limit19K
FREDERICKFREDERICKPFHxSBelow federal limit3.9K
PAULS VALLEYPAULS VALLEYPFBABelow detection6.3K
HOBARTHOBARTPFBABelow detection3.7K
HEAVENER UTILITY AUTH - PSGHEAVENERPFBABelow detection3.0K
PORUM PWAPORUMPFBABelow detection5.0K
CREEK CO RWD # 1KELLYVILLEPFBABelow detection5.7K
SHAWNEE MUNICIPAL AUTHORITYSHAWNEEPFBABelow detection30K
TECUMSEH UTILITY AUTHORITYTECUMSEHPFBABelow detection6.1K
WEWOKA PUBLIC WORKS AUTHORITYWEWOKAPFBABelow detection3.5K
EUFAULA PWAEUFAULAPFBABelow detection2.8K
CHECOTAH PWACHECOTAHPFBABelow detection3.5K
MCINTOSH CO. RWD #8 (TEXANNA)EUFAULAPFBABelow detection3.6K
HENRYETTAHENRYETTAPFPeABelow detection6.1K
NORMANNORMANPFBABelow detection105K
HOLDENVILLEHOLDENVILLEPFBABelow detection4.7K
OKLAHOMA CITYOKLAHOMA CITYPFPeABelow detection644K
MANNFORDMANNFORDPFBABelow detection3.9K
OSU WATER PLANTSTILLWATERPFBABelow detection13K
PERRY WATER & LIGHT DEPTPERRYPFBABelow detection5.2K
SKIATOOK PWASKIATOOKPFBABelow detection8.1K
BARTLESVILLEBARTLESVILLEPFPeABelow detection35K
ROGERS CO RWD # 4OOLOGAHPFBABelow detection7.7K
NEWCASTLENEWCASTLEPFBABelow detection7.9K
BRYAN CO. RW&SD #5DURANTPFPeABelow detection8.3K
GARVIN CO RWD #4PAULS VALLEYPFBABelow detection1.3K

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