Sonoma, City of
PWSID: CA4910012
System Details
| Population Served | 11,725 |
| Service Connections | 4,343 |
| Water Source | Groundwater |
| System Type | Community Water System |
| Owner | Local Government |
| Status | Active |
| City | Sonoma |
| Zip Code | 95476 |
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|
| Lead (90th percentile) | 0.0084 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0000 mg/L | 0.015 mg/L | Below Action Level |
1 Active Violations
| Contaminant | Violation | Date | Health-Based | Status |
|---|
| | 2025-07-02 | | Open |
Violation History (10 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|
| | 2021-04-01 | Major | Acknowledged |
| | 2021-04-01 | Major | Returned to Compliance |
| | 2020-01-01 | Major | Acknowledged |
| | 2020-01-01 | Major | Returned to Compliance |
| | 2020-01-01 | Major | Acknowledged |
| | 2020-01-01 | Major | Returned to Compliance |
| | 2017-11-01 | | Acknowledged |
| | 2017-11-01 | | Returned to Compliance |
| | 2006-01-01 | Major | Returned to Compliance |