HYDRO IRRIGATION DISTRICT NO 9
PWS ID: WA5335275 · WALLA WALLA, Washington 99362
Population Served
252
Total Violations
8
Health-Based Violations
4
Water Source
Groundwater
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 109
- County
- Walla Walla
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 4
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 4 | 1998 |
| Coliform (TCR) | MR | 2 | 1997 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 1979 |
| Lead and Copper Rule | MR | 1 | 1999 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.