MAHASKA RURAL WATER SYSTEM, INC.
PWS ID: IA6273901 · OSKALOOSA, Iowa 52577
Population Served
9,818
Total Violations
27
Health-Based Violations
12
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 3,927
- County
- Mahaska
- School/Daycare
- No
- MCL Violations
- 8
- Monitoring Violations
- 9
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 8 | 2015 |
| Revised Total Coliform Rule | TT | 4 | 2016 |
| Asbestos | MR | 4 | 2009 |
| Coliform (TCR) | MR | 3 | 1995 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1980 |
| Combined Radium (-226 and -228) | MR | 1 | 1980 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 60 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFHpA | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 9Cl-PF3ONS | 4/15/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHxA | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 4/15/2025 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| NEtFOSAA | 4/15/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFTrDA | 4/15/2025 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 4/15/2025 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| lithium | 4/15/2025 | <9 µg/L | 9 µg/L | Not Detected |
| PFMPA | 4/15/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| 8:2 FTS | 4/15/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| 6:2 FTS | 4/15/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 4/15/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| HFPO-DA | 4/15/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFUnA | 4/15/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 4/15/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFPeA | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 4/15/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 4/15/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHxS | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpS | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 4/15/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 4/15/2025 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| ADONA | 4/15/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 4/15/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFPeA | 10/14/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFNA | 10/14/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 10/14/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| HFPO-DA | 10/14/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBA | 10/14/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 10/14/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 4:2 FTS | 10/14/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 10/14/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMPA | 10/14/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFDA | 10/14/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 10/14/2025 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFTA | 10/14/2025 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| lithium | 10/14/2025 | <9 µg/L | 9 µg/L | Not Detected |
| NEtFOSAA | 10/14/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 10/14/2025 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| 8:2 FTS | 10/14/2025 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 10/14/2025 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFTrDA | 10/14/2025 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFHxA | 10/14/2025 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHpA | 10/14/2025 | <0.003 µg/L | 0.003 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.