CAPITOL WATER CORP
PWS ID: ID4010022 · BOISE, Idaho 83704
PFAS Detected
8 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
Population Served
9,000
Total Violations
113
Health-Based Violations
14
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 2,811
- County
- Ada
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 88
- Treatment Tech Violations
- 7
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 30 | 2015 |
| Nitrate | MR | 11 | 2009 |
| Lead and Copper Rule | MR | 11 | 2017 |
| Combined Uranium | MR | 9 | 2022 |
| Public Notice | Other | 5 | 2025 |
| Combined Uranium | MCL | 5 | 2025 |
| LEAD AND COPPER RULE REVISIONS | TT | 4 | 2024 |
| Groundwater Rule | TT | 3 | 2014 |
| Revised Total Coliform Rule | MON | 3 | 2019 |
| LEAD AND COPPER RULE REVISIONS | RPT | 3 | 2024 |
| Coliform (TCR) | MCL | 2 | 1998 |
| Benzene | MR | 1 | 1996 |
| Carbon tetrachloride | MR | 1 | 1996 |
| 1,1-Dichloroethylene | MR | 1 | 1996 |
| trans-1,2-Dichloroethylene | MR | 1 | 1996 |
| 1,2-Dichloroethane | MR | 1 | 1996 |
| p-Dichlorobenzene | MR | 1 | 1996 |
| Ethylbenzene | MR | 1 | 1996 |
| CHLOROBENZENE | MR | 1 | 1996 |
| Styrene | MR | 1 | 1996 |
| 1,1,1-Trichloroethane | MR | 1 | 1996 |
| Toluene | MR | 1 | 1996 |
| Picloram | MR | 1 | 1996 |
| 2,4,5-TP | MR | 1 | 1996 |
| Radium-226 | MR | 1 | 2008 |
| Dalapon | MR | 1 | 1996 |
| Trichloroethylene | MR | 1 | 1996 |
| Tetrachloroethylene | MR | 1 | 1996 |
| o-Dichlorobenzene | MR | 1 | 1996 |
| 1,2-Dichloropropane | MR | 1 | 1996 |
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 29 of 240 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| HFPO-DA | 8/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFMPA | 8/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxS | 8/8/2023 | 0.0046 µg/L | 0.003 µg/L | Detected |
| PFNA | 8/8/2023 | 0.0049 µg/L | 0.004 µg/L | Detected |
| PFOS | 8/8/2023 | 0.0091 µg/L | 0.004 µg/L | Detected |
| PFOA | 8/8/2023 | 0.0059 µg/L | 0.004 µg/L | Detected |
| PFDoA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 8/8/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 11Cl-PF3OUdS | 8/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| ADONA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBA | 8/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 6:2 FTS | 8/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFBS | 8/8/2023 | 0.0040 µg/L | 0.003 µg/L | Detected |
| 8:2 FTS | 8/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| PFDA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeA | 8/8/2023 | 0.0048 µg/L | 0.003 µg/L | Detected |
| PFPeS | 8/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFMBA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFEESA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NFDHA | 8/8/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFTA | 8/8/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFTrDA | 8/8/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| NEtFOSAA | 8/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| NMeFOSAA | 8/8/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| 9Cl-PF3ONS | 8/8/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| 4:2 FTS | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFHxA | 8/8/2023 | 0.0046 µg/L | 0.003 µg/L | Detected |
| PFHxS | 8/8/2023 | 0.0055 µg/L | 0.003 µg/L | Detected |
| PFHxA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDoA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFDA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFOA | 8/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFOS | 8/8/2023 | 0.0041 µg/L | 0.004 µg/L | Detected |
| NEtFOSAA | 8/8/2023 | <0.005 µg/L | 0.005 µg/L | Not Detected |
| 9Cl-PF3ONS | 8/8/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFHpA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFBS | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| NMeFOSAA | 8/8/2023 | <0.006 µg/L | 0.006 µg/L | Not Detected |
| PFTrDA | 8/8/2023 | <0.007 µg/L | 0.007 µg/L | Not Detected |
| PFTA | 8/8/2023 | <0.008 µg/L | 0.008 µg/L | Not Detected |
| PFNA | 8/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFMPA | 8/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| PFHpS | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFPeS | 8/8/2023 | <0.004 µg/L | 0.004 µg/L | Not Detected |
| NFDHA | 8/8/2023 | <0.02 µg/L | 0.02 µg/L | Not Detected |
| PFEESA | 8/8/2023 | <0.003 µg/L | 0.003 µg/L | Not Detected |
| PFUnA | 8/8/2023 | <0.002 µg/L | 0.002 µg/L | Not Detected |
| PFPeA | 8/8/2023 | <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.