SANTA ROSA, CA · Sonoma County

LOCH HAVEN MUTUAL WATER COMPANY Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 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)

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
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, 2015 – September 30, 2015
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2014 – June 30, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2014 – March 31, 2014
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2009 – December 31, 2009
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, Average
Health-based
Arsenic
January 1, 2009 – March 31, 2009
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
August 1, 2006 – August 31, 2006
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
January 1, 2004 – January 31, 2004
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
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, 2015 – September 30, 2015	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2014 – June 30, 2014	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2014 – March 31, 2014	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2009 – December 31, 2009	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
January 1, 2009 – March 31, 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
January 1, 2004 – January 31, 2004	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
September 28, 2006State Administrative/Compliance Order without penalty issued5 linked violations
February 29, 2004State Compliance achieved6 linked violations
February 20, 2004State Administrative/Compliance Order without penalty issued1 linked violation
December 22, 2000State Administrative/Compliance Order without penalty issued1 linked violation
May 21, 1996State Compliance achieved4 linked violations
January 29, 1996State Formal Notice of Violation issued4 linked violations

Contact

MACPHAIL, KATHRYN

707-696-1305

SANTA ROSA, CA 95404