Is ESTERO MUTUAL required to publish a Consumer Confidence Report?

Yes. ESTERO MUTUAL 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 ESTERO MUTUAL’s next Consumer Confidence Report due?

ESTERO MUTUAL’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

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.

DILLON BEACH, CA · Marin County

ESTERO MUTUAL Water System

Consumer Confidence Report status

ESTERO MUTUAL 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 ESTERO MUTUAL.

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): CA2100519
System type: Community Water System
Population served: 206
Service connections: 148
Ownership: privately owned
Water source: surface water (rivers, lakes, or reservoirs)

ESTERO MUTUAL is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 206 people from surface water.

As of August 1, 2026, its federal record holds 25 entries between 1980 and 2015, all of which EPA lists as closed. Nothing has been added since 2015.

Of the 25, 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, the Stage 2 Disinfectants and Disinfection Byproducts Rule, and the Radionuclides and Revised Rad Rule.

Violation history

Maximum Contaminant Level Violation, Average
Health-based
TTHM
January 1, 2015 – March 31, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
TTHM
July 1, 2013 – September 30, 2013
Resolved
Notification, Public
—
No contaminant on record
September 1, 1984 – September 30, 1984
Archived
Notification, Public
—
No contaminant on record
August 1, 1984 – August 31, 1984
Archived
Notification, Public
—
No contaminant on record
July 1, 1984 – July 31, 1984
Archived
Notification, Public
—
No contaminant on record
June 1, 1984 – June 30, 1984
Archived
Notification, Public
—
No contaminant on record
May 1, 1984 – May 31, 1984
Archived
Notification, Public
—
No contaminant on record
April 1, 1984 – April 30, 1984
Archived
Notification, Public
—
No contaminant on record
January 1, 1984 – January 31, 1984
Archived
Notification, Public
—
No contaminant on record
December 1, 1983 – December 31, 1983
Archived
Notification, Public
—
No contaminant on record
November 1, 1983 – November 30, 1983
Archived
Notification, Public
—
No contaminant on record
October 1, 1983 – October 31, 1983
Archived
Notification, Public
—
No contaminant on record
September 1, 1983 – September 30, 1983
Archived
Notification, Public
—
No contaminant on record
August 1, 1983 – August 31, 1983
Archived
Notification, Public
—
No contaminant on record
July 1, 1983 – July 31, 1983
Archived
Notification, Public
—
No contaminant on record
June 1, 1983 – June 30, 1983
Archived
Notification, Public
—
No contaminant on record
May 1, 1983 – May 31, 1983
Archived
Notification, Public
—
No contaminant on record
April 1, 1983 – April 30, 1983
Archived
Notification, Public
—
No contaminant on record
March 1, 1983 – March 31, 1983
Archived
Notification, Public
—
No contaminant on record
February 1, 1983 – February 28, 1983
Archived
Notification, Public
—
No contaminant on record
January 1, 1983 – January 31, 1983
Archived
Notification, Public
—
No contaminant on record
December 1, 1982 – December 31, 1982
Archived
Notification, Public
—
No contaminant on record
October 1, 1982 – October 31, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 30, 1980 – October 29, 1981
Archived

Resolved 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
January 1, 2015 – March 31, 2015	Maximum Contaminant Level Violation, Average	TTHM	Health-based	Resolved
July 1, 2013 – September 30, 2013	Maximum Contaminant Level Violation, Average	TTHM	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
April 1, 1984 – April 30, 1984	Notification, Public	—	—	Archived
January 1, 1984 – January 31, 1984	Notification, Public	—	—	Archived
December 1, 1983 – December 31, 1983	Notification, Public	—	—	Archived
November 1, 1983 – November 30, 1983	Notification, Public	—	—	Archived
October 1, 1983 – October 31, 1983	Notification, Public	—	—	Archived
September 1, 1983 – September 30, 1983	Notification, Public	—	—	Archived
August 1, 1983 – August 31, 1983	Notification, Public	—	—	Archived
July 1, 1983 – July 31, 1983	Notification, Public	—	—	Archived
June 1, 1983 – June 30, 1983	Notification, Public	—	—	Archived
May 1, 1983 – May 31, 1983	Notification, Public	—	—	Archived
April 1, 1983 – April 30, 1983	Notification, Public	—	—	Archived
March 1, 1983 – March 31, 1983	Notification, Public	—	—	Archived
February 1, 1983 – February 28, 1983	Notification, Public	—	—	Archived
January 1, 1983 – January 31, 1983	Notification, Public	—	—	Archived
December 1, 1982 – December 31, 1982	Notification, Public	—	—	Archived
October 1, 1982 – October 31, 1982	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

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

May 25, 2023State Compliance achieved14 linked violations
April 1, 2017State Compliance achieved33 linked violations
February 5, 2013State Bilateral Compliance Agreement signed26 linked violations

Common questions

Is ESTERO MUTUAL required to publish a Consumer Confidence Report?: Yes. ESTERO MUTUAL 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 ESTERO MUTUAL’s next Consumer Confidence Report due?: ESTERO MUTUAL’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does ESTERO MUTUAL have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for ESTERO MUTUAL.
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

BREZINA, JOHN

707-878-2400

DILLON BEACH, CA 94929