UPPER LAKE COUNTY WATER DISTRICT
California — Community Water System — PWSID: CA1710009
System Information
| PWSID | CA1710009 |
| System Name | UPPER LAKE COUNTY WATER DISTRICT |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Nov 17, 2025 |
Location & Contact
| State | California |
| City | UPPER LAKE |
| ZIP Code | 95485 |
| Address | P.O. BOX 847 |
| Organization | HENRY, RACHELLE |
| Phone | 707-275-3232 |
Population & Service
| Population Served | 989 |
| Service Connections | 403 |
Drinking Water Violations (6)
This water system has 6 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2019 | Dec 31, 2019 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2019 | Nitrate Rule |
| Jan 1, 2019 | Dec 31, 2019 | Nitrate | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2019 | Nitrate Rule |
| Jul 1, 2008 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jul 7, 2016 | Lead and Copper Rule |
| Jul 1, 2008 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jul 7, 2016 | Lead and Copper Rule |
| Feb 1, 1989 | Feb 28, 1989 | Other | No | No | — | — | — | Archived | Feb 28, 1989 | Miscellaneous Other Rules | |
| Feb 1, 1989 | Feb 28, 1989 | Other | No | No | — | — | — | Archived | Feb 28, 1989 | Miscellaneous Other Rules |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.