MCNEIL ISLAND WATER
PWS ID: WA5352900 · Tumwater, Washington 98501
Population Served
692
Total Violations
75
Health-Based Violations
35
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- State
- Connections
- 271
- County
- Pierce
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 36
- Treatment Tech Violations
- 34
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | TT | 34 | 2022 |
| Surface Water Treatment Rule | MR | 4 | 2006 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2019 |
| TTHM | MR | 2 | 2019 |
| Consumer Confidence Rule | Other | 2 | 2012 |
| cis-1,2-Dichloroethylene | MR | 1 | 2010 |
| Vinyl chloride | MR | 1 | 2010 |
| Carbon tetrachloride | MR | 1 | 2010 |
| 1,2-Dichloropropane | MR | 1 | 2010 |
| 1,1,2-Trichloroethane | MR | 1 | 2010 |
| Tetrachloroethylene | MR | 1 | 2010 |
| CHLOROBENZENE | MR | 1 | 2010 |
| Benzene | MR | 1 | 2010 |
| Ethylbenzene | MR | 1 | 2010 |
| Styrene | MR | 1 | 2010 |
| Coliform (TCR) | MR | 1 | 1992 |
| Aldicarb sulfoxide | MR | 1 | 2008 |
| Aldicarb | MR | 1 | 2008 |
| OXAMYL | MR | 1 | 2008 |
| Coliform (TCR) | MCL | 1 | 2004 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2010 |
| 1,1,1-Trichloroethane | MR | 1 | 2010 |
| trans-1,2-Dichloroethylene | MR | 1 | 2010 |
| o-Dichlorobenzene | MR | 1 | 2010 |
| 1,1-Dichloroethylene | MR | 1 | 2010 |
| Nitrate | MR | 1 | 2018 |
| p-Dichlorobenzene | MR | 1 | 2010 |
| Carbofuran | MR | 1 | 2008 |
| Trichloroethylene | MR | 1 | 2010 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.