TWIN HILLS SCHOOL DIST-TWIN HILLS SCHOOL
PWS ID: CA4900707 · SEBASTOPOL, California 95472
Population Served
400
Total Violations
8
Health-Based Violations
0
Water Source
Groundwater
System Details
- System Type
- Non-Transient Non-Community
- Owner Type
- Local
- Connections
- 2
- County
- Sonoma
- School/Daycare
- Yes
- MCL Violations
- 0
- Monitoring Violations
- 7
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 2 | 2006 |
| Coliform (TCR) | MR | 2 | 2008 |
| Total Haloacetic Acids (HAA5) | MR | 1 | 2005 |
| TTHM | MR | 1 | 2005 |
| Lead and Copper Rule | MR | 1 | 1993 |
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025.
This data is provided for informational purposes only.