LAKE ISABELLA, CA · Kern County
OAK KNOLLS MUTUAL WATER COMPANY Water System
Consumer Confidence Report status
OAK KNOLLS MUTUAL WATER COMPANY 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 1 item for OAK KNOLLS MUTUAL WATER COMPANY that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.
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)
- CA1500465
- System type
- Community Water System
- Population served
- 123
- Service connections
- 47
- Ownership
- privately owned
- Water source
- groundwater (wells)
OAK KNOLLS MUTUAL WATER COMPANY is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 123 people from groundwater.
As of August 1, 2026, its federal record holds 12 entries between 1980 and 2024, of which 1 remains open; none are health-based.
Of the 12, 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 Miscellaneous Other Rules, the Radionuclides and Revised Rad Rule, and the Lead and Copper Rule.
Violation history
LSL Reporting
—LEAD AND COPPER RULE REVISIONS
October 17, 2024
UnaddressedMaximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
March 1, 2012 – March 31, 2012
ResolvedNotification, Public
—No contaminant on record
September 1, 1984 – September 30, 1984
ArchivedNotification, Public
—No contaminant on record
August 1, 1984 – August 31, 1984
ArchivedNotification, Public
—No contaminant on record
July 1, 1984 – July 31, 1984
ArchivedNotification, Public
—No contaminant on record
June 1, 1984 – June 30, 1984
ArchivedNotification, Public
—No contaminant on record
May 1, 1984 – May 31, 1984
ArchivedNotification, Public
—No contaminant on record
March 1, 1984 – March 31, 1984
ArchivedNotification, Public
—No contaminant on record
February 1, 1984 – February 29, 1984
ArchivedNotification, Public
—No contaminant on record
October 1, 1983 – October 31, 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
Unaddressed no corrective action on record yetResolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
| Period | Violation | Contaminant / rule | Health-based | Status |
|---|---|---|---|---|
| October 17, 2024 | LSL Reporting | LEAD AND COPPER RULE REVISIONS | — | Unaddressed |
| March 1, 2012 – March 31, 2012 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Resolved |
| September 1, 1984 – September 30, 1984 | Notification, Public | — | — | Archived |
| August 1, 1984 – August 31, 1984 | Notification, Public | — | — | Archived |
| July 1, 1984 – July 31, 1984 | Notification, Public | — | — | Archived |
| June 1, 1984 – June 30, 1984 | Notification, Public | — | — | Archived |
| May 1, 1984 – May 31, 1984 | Notification, Public | — | — | Archived |
| March 1, 1984 – March 31, 1984 | Notification, Public | — | — | Archived |
| February 1, 1984 – February 29, 1984 | Notification, Public | — | — | Archived |
| October 1, 1983 – October 31, 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 |
Unaddressed no corrective action on record yetResolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
No enforcement actions on record for this system.
Common questions
Is OAK KNOLLS MUTUAL WATER COMPANY required to publish a Consumer Confidence Report?
- Yes. OAK KNOLLS MUTUAL WATER COMPANY 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 OAK KNOLLS MUTUAL WATER COMPANY’s next Consumer Confidence Report due?
- OAK KNOLLS MUTUAL WATER COMPANY’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does OAK KNOLLS MUTUAL WATER COMPANY have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show 1 item for OAK KNOLLS MUTUAL WATER COMPANY that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.
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
TRUBEY, DENNIS
928-234-0499
LAKE ISABELLA, CA 93240