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STILLWATER UTILITIES AUTHORITY

PWS ID: OK1021220 · STILLWATER, Oklahoma 74076-1449

PFAS Detected

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

Population Served
53,000
Total Violations
160
Health-Based Violations
80
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
17,348
County
Payne
School/Daycare
No
MCL Violations
19
Monitoring Violations
58
Treatment Tech Violations
61

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Bromate MR 31 2017
CARBON, TOTAL TT 26 2022
Coliform (TCR) MCL 19 2010
Interim Enhanced Surface Water Treatment Rule TT 18 2018
Surface Water Treatment Rule TT 17 2023
CARBON, TOTAL MR 17 2017
Coliform (TCR) MR 7 2005
Nitrate-Nitrite MR 3 2016

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 18 of 120 samples detected PFAS.

Contaminant Date Result MRL Status
PFHpA 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxS 9/3/2024 0.0041 µg/L 0.003 µg/L Detected
PFNA 9/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 9/3/2024 0.0063 µg/L 0.004 µg/L Detected
6:2 FTS 9/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
11Cl-PF3OUdS 9/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBS 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
NFDHA 9/3/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFOA 9/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFDA 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 9/3/2024 0.0032 µg/L 0.003 µg/L Detected
PFUnA 9/3/2024 <0.002 µg/L 0.002 µg/L Not Detected
9Cl-PF3ONS 9/3/2024 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 9/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 9/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 9/3/2024 <0.007 µg/L 0.007 µg/L Not Detected
4:2 FTS 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 9/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFMPA 9/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFPeA 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFEESA 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 9/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 9/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
HFPO-DA 9/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 9/3/2024 <0.008 µg/L 0.008 µg/L Not Detected
lithium 9/3/2024 13.0000 µg/L 9 µg/L Detected
NMeFOSAA 9/3/2024 <0.006 µg/L 0.006 µg/L Not Detected
PFPeS 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/3/2024 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMBA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
4:2 FTS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
6:2 FTS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFHpS 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
HFPO-DA 6/3/2024 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/3/2024 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/3/2024 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/3/2024 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/3/2024 0.0047 µg/L 0.004 µg/L Detected
PFNA 6/3/2024 <0.004 µg/L 0.004 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.