TAMOSHAN
PWS ID: WA5387140 · Olympia, Washington 98512
Population Served
260
Total Violations
42
Health-Based Violations
23
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 94
- County
- Thurston
- School/Daycare
- No
- MCL Violations
- 23
- Monitoring Violations
- 13
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Total Haloacetic Acids (HAA5) | MCL | 16 | 2023 |
| TTHM | MCL | 6 | 2017 |
| Coliform (TCR) | MR | 5 | 1999 |
| Revised Total Coliform Rule | MON | 3 | 2025 |
| Lead and Copper Rule | MR | 2 | 2000 |
| Consumer Confidence Rule | Other | 2 | 2016 |
| TTHM | MR | 1 | 2018 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Cadmium | MCL | 1 | 1982 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2018 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.