Is LOCH HAVEN MUTUAL WATER COMPANY required to publish a Consumer Confidence Report?

Yes. LOCH HAVEN 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 LOCH HAVEN MUTUAL WATER COMPANY’s next Consumer Confidence Report due?

LOCH HAVEN MUTUAL WATER COMPANY’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.

SANTA ROSA, CA · Sonoma County

LOCH HAVEN MUTUAL WATER COMPANY Water System

Consumer Confidence Report status

LOCH HAVEN 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 no open violations for LOCH HAVEN MUTUAL WATER COMPANY.

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): CA4900575
System type: Community Water System
Population served: 26
Service connections: 12
Ownership: privately owned
Water source: groundwater (wells)

LOCH HAVEN MUTUAL WATER COMPANY is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 26 people from groundwater.

As of August 1, 2026, its federal record holds 16 entries between 1981 and 2017, all of which EPA lists as closed. Nothing has been added since 2017.

Of the 16, 1 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 inorganic chemicals, the Miscellaneous Other Rules, and the Total Coliform Rules.

Violation history

Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2017 – December 31, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2017 – September 30, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2017 – June 30, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2016 – December 31, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2016 – September 30, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2016 – June 30, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2016 – March 31, 2016
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2011 – December 31, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2011 – June 30, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2011 – March 31, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2009 – September 30, 2009
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2009 – June 30, 2009
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
August 1, 2006 – August 31, 2006
Resolved
Notification, Public
—
No contaminant on record
September 1, 1984 – September 30, 1984
Archived
Notification, Public
—
No contaminant on record
July 1, 1984 – July 31, 1984
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
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
October 1, 2017 – December 31, 2017	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2017 – September 30, 2017	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2017 – June 30, 2017	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2016 – December 31, 2016	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2016 – September 30, 2016	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2016 – June 30, 2016	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2016 – March 31, 2016	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2011 – December 31, 2011	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2011 – June 30, 2011	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2011 – March 31, 2011	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2009 – September 30, 2009	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2009 – June 30, 2009	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
August 1, 2006 – August 31, 2006	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 1984 – September 30, 1984	Notification, Public	—	—	Archived
July 1, 1984 – July 31, 1984	Notification, Public	—	—	Archived
October 1, 1981 – September 30, 1982	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

February 6, 2019State Compliance achieved37 linked violations
October 30, 2015State Compliance achieved1 linked violation
July 20, 2011State Compliance achieved1 linked violation
March 30, 2011State Administrative/Compliance Order without penalty issued1 linked violation
December 21, 2010State Administrative/Compliance Order without penalty issued1 linked violation
November 30, 2010State Compliance achieved1 linked violation
August 31, 2009State Compliance achieved1 linked violation
June 30, 2009State Compliance achieved4 linked violations
December 30, 2004State Compliance achieved3 linked violations
December 23, 2004State Administrative/Compliance Order without penalty issued4 linked violations
December 22, 2000State Administrative/Compliance Order without penalty issued1 linked violation
December 4, 1997State Compliance achieved7 linked violations
January 29, 1996State Formal Notice of Violation issued5 linked violations

Common questions

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

MACPHAIL, KATHRYN

707-696-1305

SANTA ROSA, CA 95404