NAPA, CA · Napa County
CIRCLE OAKS WATER DISTRICT Water System
Consumer Confidence Report status
CIRCLE OAKS 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 CIRCLE OAKS 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)
- CA2800521
- System type
- Community Water System
- Population served
- 500
- Service connections
- 190
- Ownership
- privately owned
- Water source
- surface water (rivers, lakes, or reservoirs)
CIRCLE OAKS WATER DISTRICT is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 500 people from surface water.
As of August 1, 2026, its federal record holds 2 entries between 1980 and 1981, all of which EPA lists as closed. Nothing has been added since 1981.
All 2 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 Radionuclides and Revised Rad Rule.
Violation history
Monitoring, Regular
—Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
ArchivedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
October 30, 1980 – October 29, 1981
Archived
Archived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| October 1, 1981 – September 30, 1982 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
| October 30, 1980 – October 29, 1981 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Archived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- June 30, 2002Federal Compliance achieved1 linked violation
Common questions
Is CIRCLE OAKS WATER DISTRICT required to publish a Consumer Confidence Report?
- Yes. CIRCLE OAKS 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 CIRCLE OAKS WATER DISTRICT’s next Consumer Confidence Report due?
- CIRCLE OAKS WATER DISTRICT’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does CIRCLE OAKS WATER DISTRICT have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for CIRCLE OAKS 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
QUARNERI, PAUL
707-966-1607
NAPA, CA 94558