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States → Oklahoma

DUNCAN PUBLIC UTILITIES AUTHORITY

PWS ID: OK1010809 · DUNCAN, Oklahoma 73534

PFAS Detected

5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
23,000
Total Violations
844
Health-Based Violations
792
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
10,938
County
Stephens
School/Daycare
No
MCL Violations
621
Monitoring Violations
45
Treatment Tech Violations
171

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
TTHM MCL 457 2023
Total Haloacetic Acids (HAA5) MCL 158 2017
CARBON, TOTAL TT 155 2024
Interim Enhanced Surface Water Treatment Rule TT 16 2016
Total Haloacetic Acids (HAA5) MR 14 2017
TTHM MR 10 2017
Chloramine MR 8 2024
CARBON, TOTAL MR 8 2024
Coliform (TCR) MCL 6 2003
Revised Total Coliform Rule MON 4 2024
Coliform (TCR) MR 1 1998

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 25 of 240 samples detected PFAS.

Contaminant Date Result MRL Status
PFPeS 7/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
lithium 7/10/2024 11.2000 µg/L 9 µg/L Detected
PFMPA 7/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 7/10/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFHpS 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTrDA 7/10/2024 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
NMeFOSAA 7/10/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFEESA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFUnA 7/10/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFBA 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
ADONA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 7/10/2024 <0.008 µg/L 0.008 µg/L Not Detected
8:2 FTS 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 7/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 7/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 7/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDoA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 7/10/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxS 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 7/10/2024 0.0050 µg/L 0.005 µg/L Detected
4:2 FTS 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 7/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
NEtFOSAA 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 7/10/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFPeA 7/10/2024 0.0037 µg/L 0.003 µg/L Detected
HFPO-DA 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFEESA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 7/10/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFPeS 7/10/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFHpS 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 7/10/2024 <0.008 µg/L 0.008 µg/L Not Detected
NMeFOSAA 7/10/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFHpA 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 7/10/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 7/10/2024 <0.005 µg/L 0.005 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.