CLEARLAKE OAKS COUNTY WATER DISTRICT
California - Community Water System - PWSID: CA1710001
System Information
| PWSID | CA1710001 |
| System Name | CLEARLAKE OAKS COUNTY WATER DISTRICT |
| System Type | Community Water System |
| Water Source | Surface Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 09 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 22, 1979 |
| Last Reported | Mar 20, 2026 |
Location & Contact
| State | California |
| City | CLEARLAKE OAK |
| ZIP Code | 95423 |
| Address | 12952 East Highway 20 |
| Organization | MANN, DIANNA |
| Phone | 707-998-3322 |
Population & Service
| Population Served | 2,359 |
| Service Connections | 2,161 |
Drinking Water Violations (21)
This water system has 21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 1, 2023 | Dec 31, 2023 | MCL | Yes | No | 83.5 UG/L | 0.080 mg/L | 80 | Resolved | Dec 31, 2023 | - | |
| Oct 1, 2023 | Dec 31, 2023 | MCL | Yes | No | 83.5 UG/L | 0.080 mg/L | 80 | Resolved | Dec 31, 2023 | - | |
| Apr 1, 2021 | Jun 30, 2021 | MCL | Yes | No | .087 MG/L | 0.080 mg/L | .08 | Resolved | Jun 30, 2021 | - | |
| Apr 1, 2021 | Jun 30, 2021 | MCL | Yes | No | .087 MG/L | 0.080 mg/L | .08 | Resolved | Jun 30, 2021 | - | |
| Oct 1, 2019 | - | MR | No | No | - | TT | - | Resolved | Jan 22, 2020 | - | |
| Oct 1, 2019 | - | MR | No | No | - | TT | - | Resolved | Jan 22, 2020 | - | |
| Oct 1, 2019 | - | MR | No | No | - | TT | - | Resolved | Jan 22, 2020 | - | |
| Jan 1, 2019 | Dec 31, 2019 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2019 | - | |
| Jan 1, 2019 | Dec 31, 2019 | MR | No | Yes | - | 10 mg/L | - | Resolved | Dec 31, 2019 | - | |
| Oct 1, 2017 | Oct 31, 2017 | MR | No | No | - | - | - | Resolved | Oct 31, 2017 | - | |
| Oct 1, 2017 | Oct 31, 2017 | MR | No | No | - | - | - | Resolved | Oct 31, 2017 | - | |
| Jul 1, 2006 | Jul 31, 2006 | TT | Yes | No | - | - | - | Resolved | Jul 31, 2006 | - | |
| Jul 1, 2006 | Jul 31, 2006 | TT | Yes | No | - | - | - | Resolved | Jul 31, 2006 | - | |
| Jun 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Jul 7, 2016 | - | |
| Jun 1, 2006 | - | MR | No | No | - | TT | - | Resolved | Jul 7, 2016 | - | |
| Oct 1, 2005 | Dec 31, 2005 | MCL | Yes | No | .082 MG/L | 0.080 mg/L | .08 | Resolved | Dec 31, 2005 | - | |
| Oct 1, 2005 | Dec 31, 2005 | MCL | Yes | No | .082 MG/L | 0.080 mg/L | .08 | Resolved | Dec 31, 2005 | - | |
| Jul 1, 1993 | Dec 31, 2003 | MR | No | No | - | TT | - | Resolved | Dec 31, 2003 | - | |
| Jul 1, 1993 | Dec 31, 2003 | MR | No | No | - | TT | - | Resolved | Dec 31, 2003 | - | |
| - | - | - | No | No | - | - | - | - | - | - | |
| - | - | - | No | No | - | - | - | - | - | - |
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.