CLEARLAKE OAK, CA · Lake County
CLEARLAKE OAKS COUNTY WATER DISTRICT Water System
Consumer Confidence Report status
CLEARLAKE OAKS COUNTY WATER DISTRICT must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for CLEARLAKE OAKS COUNTY WATER DISTRICT.
Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace California’s official records. Always confirm current status with California before making decisions based on this information.
System facts
- System ID (PWSID)
- CA1710001
- System type
- Community Water System
- Population served
- 2,359
- Service connections
- 2,161
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
CLEARLAKE OAKS COUNTY WATER DISTRICT is one of 728 community water systems in California in the 501 to 3,300 people size category, serving 2,359 people from surface water.
As of August 1, 2026, its federal record holds 5 entries between 2017 and 2023, all of which EPA lists as closed. Nothing has been added since 2023.
Of the 5, 3 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Stage 2 Disinfectants and Disinfection Byproducts Rule, the Lead and Copper Rule, and inorganic chemicals.
Violation history
Maximum Contaminant Level Violation, Average
Health-basedTTHM
October 1, 2023 – December 31, 2023
ResolvedMaximum Contaminant Level Violation, Average
Health-basedTTHM
April 1, 2021 – June 30, 2021
ResolvedFollow-up Or Routine LCR Tap M/R
—Lead and Copper Rule
October 1, 2019 – January 22, 2020
ResolvedMonitoring, Regular
—Nitrate
January 1, 2019 – December 31, 2019
ResolvedMonitoring of Treatment (SWTR-Filter)
—Surface Water Treatment Rule
October 1, 2017 – October 31, 2017
Resolved
Resolved addressed and confirmed by the state
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| October 1, 2023 – December 31, 2023 | Maximum Contaminant Level Violation, Average | TTHM | Health-based | Resolved |
| April 1, 2021 – June 30, 2021 | Maximum Contaminant Level Violation, Average | TTHM | Health-based | Resolved |
| October 1, 2019 – January 22, 2020 | Follow-up Or Routine LCR Tap M/R | Lead and Copper Rule | — | Resolved |
| January 1, 2019 – December 31, 2019 | Monitoring, Regular | Nitrate | — | Resolved |
| October 1, 2017 – October 31, 2017 | Monitoring of Treatment (SWTR-Filter) | Surface Water Treatment Rule | — | Resolved |
Resolved addressed and confirmed by the state
Enforcement actions
- February 7, 2024State Compliance achieved1 linked violation
- March 14, 2023State Administrative/Compliance Order without penalty issued2 linked violations
- May 11, 2020State Administrative/Compliance Order without penalty issued1 linked violation
- February 11, 2020State Administrative/Compliance Order without penalty issued2 linked violations
- March 9, 2018State Compliance achieved9 linked violations
- August 15, 2006State Compliance achieved13 linked violations
Common questions
Is CLEARLAKE OAKS COUNTY WATER DISTRICT required to publish a Consumer Confidence Report?
- Yes. CLEARLAKE OAKS COUNTY WATER DISTRICT is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is CLEARLAKE OAKS COUNTY WATER DISTRICT’s next Consumer Confidence Report due?
- CLEARLAKE OAKS COUNTY WATER DISTRICT’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does CLEARLAKE OAKS COUNTY WATER DISTRICT have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for CLEARLAKE OAKS COUNTY WATER DISTRICT.
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
MANN, DIANNA
707-998-3322
CLEARLAKE OAK, CA 95423