SIOUX CITY WATER SUPPLY
PWS ID: IA9778054 · SIOUX CITY, Iowa 51103
PFAS Detected
10 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
85,791
Total Violations
133
Health-Based Violations
54
Water Source
Surface Water
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 29,424
- County
- Woodbury
- School/Daycare
- No
- MCL Violations
- 28
- Monitoring Violations
- 54
- Treatment Tech Violations
- 26
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 17 | 1997 |
| Epichlorohydrin | TT | 10 | 2017 |
| TTHM | MCL | 9 | 2019 |
| Surface Water Treatment Rule | TT | 8 | 2012 |
| Interim Enhanced Surface Water Treatment Rule | TT | 8 | 2004 |
| Surface Water Treatment Rule | MR | 7 | 2012 |
| Gross Alpha, Excl. Radon and U | MR | 4 | 1993 |
| Nitrate | MR | 4 | 2007 |
| Interim Enhanced Surface Water Treatment Rule | MR | 4 | 2015 |
| TTHM | MR | 4 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 4 | 2024 |
| Barium | MR | 3 | 2001 |
| Chromium | MR | 3 | 2001 |
| Fluoride | MR | 3 | 2001 |
| Antimony, Total | MR | 3 | 2001 |
| Selenium | MR | 3 | 2001 |
| Arsenic | MR | 3 | 2001 |
| Cadmium | MR | 3 | 2001 |
| Mercury | MR | 3 | 2001 |
| Thallium, Total | MR | 3 | 2001 |
| Combined Radium (-226 and -228) | MCL | 2 | 1979 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 39 of 240 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| ADONA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| lithium | 7/15/2024 | 140.0000 µg/L | 9 µg/L | Detected |
| PFNA | 7/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMBA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 7/15/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFTA | 7/15/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| NMeFOSAA | 7/15/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 7/15/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFPeS | 7/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFOS | 7/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOA | 7/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 7/15/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 7/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 9Cl-PF3ONS | 7/15/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 8:2 FTS | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFPeA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| HFPO-DA | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFHxS | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 7/15/2024 | 0.0092 µg/L | 0.005 µg/L | Detected |
| PFMBA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 7/15/2024 | 0.0180 µg/L | 0.003 µg/L | Detected |
| lithium | 7/15/2024 | 230.0000 µg/L | 9 µg/L | Detected |
| PFEESA | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 7/15/2024 | 0.0290 µg/L | 0.003 µg/L | Detected |
| 6:2 FTS | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 7/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFTA | 7/15/2024 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 7/15/2024 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFHpA | 7/15/2024 | 0.0043 µg/L | 0.003 µg/L | Detected |
| PFBS | 7/15/2024 | 0.0170 µg/L | 0.003 µg/L | Detected |
| NMeFOSAA | 7/15/2024 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 8:2 FTS | 7/15/2024 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NFDHA | 7/15/2024 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| 4:2 FTS | 7/15/2024 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 7/15/2024 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFNA | 7/15/2024 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeS | 7/15/2024 | 0.0110 µg/L | 0.004 µg/L | 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.