LOMA MAR, CA · San Mateo County

LOMA MAR MUTUAL 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): CA4100512
System type: Community Water System
Population served: 65
Service connections: 34
Ownership: privately owned
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 2005 – January 31, 2005
Resolved
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
April 1, 1984 – April 30, 1984
Archived
Notification, Public
—
No contaminant on record
March 1, 1984 – March 31, 1984
Archived
Notification, Public
—
No contaminant on record
February 1, 1984 – February 29, 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
November 1, 1982 – November 30, 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
Maximum Contaminant Level Violation, Single Sample
Health-based
Mercury
June 1, 1980 – May 31, 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
January 1, 2005 – January 31, 2005	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
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
April 1, 1984 – April 30, 1984	Notification, Public	—	—	Archived
March 1, 1984 – March 31, 1984	Notification, Public	—	—	Archived
February 1, 1984 – February 29, 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
November 1, 1982 – November 30, 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
June 1, 1980 – May 31, 1982	Maximum Contaminant Level Violation, Single Sample	Mercury	Health-based	Archived

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

Enforcement actions

January 25, 2019State Compliance achieved5 linked violations
February 27, 2018State Compliance achieved6 linked violations
June 3, 2013State Compliance achieved6 linked violations
August 31, 2006State Compliance achieved4 linked violations
January 5, 2006State Compliance achieved3 linked violations

Contact

HARTMAN-CARR, WENDY

650-879-9638

LOMA MAR, CA 94021