OAKLEY, CA · Contra Costa County
BIG OAK MOBILE HOME PARK WATER Water System
Consumer Confidence Report status
BIG OAK MOBILE HOME PARK WATER 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 BIG OAK MOBILE HOME PARK WATER.
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)
- CA0707588
- System type
- Community Water System
- Population served
- 156
- Service connections
- 66
- Ownership
- privately owned
- Water source
- groundwater (wells)
BIG OAK MOBILE HOME PARK WATER is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 156 people from groundwater.
As of August 1, 2026, its federal record holds 5 entries between 1980 and 1984, all of which EPA lists as closed. Nothing has been added since 1984.
Of the 5, 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 Miscellaneous Other Rules and the Radionuclides and Revised Rad Rule.
Violation history
Notification, Public
—No contaminant on record
July 1, 1984 – July 31, 1984
ArchivedNotification, Public
—No contaminant on record
April 1, 1984 – April 30, 1984
ArchivedNotification, Public
—No contaminant on record
November 1, 1983 – November 30, 1983
ArchivedMonitoring, 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 |
|---|---|---|---|---|
| July 1, 1984 – July 31, 1984 | Notification, Public | — | — | Archived |
| April 1, 1984 – April 30, 1984 | Notification, Public | — | — | Archived |
| November 1, 1983 – November 30, 1983 | Notification, Public | — | — | Archived |
| 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
- December 31, 2013State Compliance achieved2 linked violations
- June 26, 2009State Formal Notice of Violation issued1 linked violation
- August 20, 2008State Formal Notice of Violation issued1 linked violation
Common questions
Is BIG OAK MOBILE HOME PARK WATER required to publish a Consumer Confidence Report?
- Yes. BIG OAK MOBILE HOME PARK WATER 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 BIG OAK MOBILE HOME PARK WATER’s next Consumer Confidence Report due?
- BIG OAK MOBILE HOME PARK WATER’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does BIG OAK MOBILE HOME PARK WATER have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for BIG OAK MOBILE HOME PARK WATER.
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
DUARTE, JOE
925-625-2238
OAKLEY, CA 94561