BLACKWELL MUNICIPAL AUTHORITY
PWS ID: OK1021101 · BLACKWELL, Oklahoma 74631
PFAS Detected
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
7,668
Total Violations
250
Health-Based Violations
165
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 3,158
- County
- Kay
- School/Daycare
- No
- MCL Violations
- 122
- Monitoring Violations
- 57
- Treatment Tech Violations
- 43
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 114 | 2023 |
| Interim Enhanced Surface Water Treatment Rule | TT | 32 | 2025 |
| Chlorite | MR | 28 | 2020 |
| Surface Water Treatment Rule | TT | 11 | 2022 |
| Coliform (TCR) | MCL | 8 | 2012 |
| Chlorine | MR | 8 | 2020 |
| Coliform (TCR) | MR | 5 | 2009 |
| Consumer Confidence Rule | Other | 5 | 2017 |
| Atrazine | MR | 4 | 2012 |
| TTHM | MR | 4 | 2025 |
| Interim Enhanced Surface Water Treatment Rule | MR | 2 | 2025 |
| Chlorine dioxide | MR | 2 | 2025 |
| BHC-GAMMA | MR | 1 | 2011 |
| Methoxychlor | MR | 1 | 2011 |
| Carbofuran | MR | 1 | 2011 |
| 2,4-D | MR | 1 | 2011 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 4 of 120 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFMPA | 8/16/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 8/16/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFPeA | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 8:2 FTS | 8/16/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMBA | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 8/16/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 8/16/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 8/16/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 8/16/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTA | 8/16/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFNA | 8/16/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| lithium | 8/16/2023 | 21.0000 µg/L | 9 µg/L | Detected |
| PFBS | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 8/16/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOS | 8/16/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 8/16/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFBA | 8/16/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDoA | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 8/16/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 8/16/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 8/16/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| ADONA | 8/16/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 8/16/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDoA | 5/17/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 5/17/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 5/17/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 5/17/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 5/17/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOS | 5/17/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 5/17/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFDA | 5/17/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 5/17/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFTrDA | 5/17/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 5/17/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 5/17/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| lithium | 5/17/2023 | 17.0000 µg/L | 9 µg/L | Detected |
| PFTA | 5/17/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFOA | 5/17/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFBA | 5/17/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxA | 5/17/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 5/17/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 5/17/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFNA | 5/17/2023 | <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.