PIONEER SCHOOL DISTRICT
PWS ID: WA5367723 · Shelton, Washington 98584-5034
Population Served
903
Total Violations
39
Health-Based Violations
16
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 2
- County
- Mason
- School/Daycare
- Yes
- MCL Violations
- 16
- Monitoring Violations
- 23
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 16 | 1999 |
| Coliform (TCR) | MR | 12 | 1993 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2023 |
| TTHM | MR | 5 | 2023 |
| Nitrate | MR | 1 | 2019 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.