LA MESA, CA · San Diego County

TWIN LAKES RESORT Water System

Current status

2 items on record are open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

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): CA3701793
System type: Community Water System
Population served: 400
Service connections: 153
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2024 – December 31, 2024
Archived
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2024 – September 30, 2024
Archived
Monitoring, Regular
—
Nitrate
January 1, 2023 – December 31, 2023
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Arsenic
October 1, 2022 – December 31, 2022
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Arsenic
April 1, 2022 – June 30, 2022
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Arsenic
January 1, 2022 – March 31, 2022
Archived
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2021 – March 31, 2021
Archived
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2016 – September 30, 2016
Archived
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2016 – June 30, 2016
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2015 – August 31, 2015
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 2014 – March 31, 2014
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 2009 – November 30, 2009
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
April 14, 2009
Addressed
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
June 25, 2007
Addressed
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
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
September 1, 1983 – September 30, 1983
Archived
Notification, Public
—
No contaminant on record
May 1, 1983 – May 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
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

Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the stateAddressed corrective action reported, pending final confirmation

Period	Violation	Contaminant / rule	Health-based	Status
October 1, 2024 – December 31, 2024	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Archived
July 1, 2024 – September 30, 2024	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Archived
January 1, 2023 – December 31, 2023	Monitoring, Regular	Nitrate	—	Archived
October 1, 2022 – December 31, 2022	Maximum Contaminant Level Violation, Single Sample	Arsenic	Health-based	Archived
April 1, 2022 – June 30, 2022	Maximum Contaminant Level Violation, Single Sample	Arsenic	Health-based	Archived
January 1, 2022 – March 31, 2022	Maximum Contaminant Level Violation, Single Sample	Arsenic	Health-based	Archived
January 1, 2021 – March 31, 2021	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Archived
July 1, 2016 – September 30, 2016	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Archived
April 1, 2016 – June 30, 2016	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Archived
August 1, 2015 – August 31, 2015	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
March 1, 2014 – March 31, 2014	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
November 1, 2009 – November 30, 2009	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
April 14, 2009	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Addressed
June 25, 2007	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Addressed
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
March 1, 1984 – March 31, 1984	Notification, Public	—	—	Archived
February 1, 1984 – February 29, 1984	Notification, Public	—	—	Archived
September 1, 1983 – September 30, 1983	Notification, Public	—	—	Archived
May 1, 1983 – May 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, 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

Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the stateAddressed corrective action reported, pending final confirmation

Enforcement actions

December 13, 2016State Administrative/Compliance Order without penalty issued30 linked violations
April 17, 2014State Administrative/Compliance Order without penalty issued1 linked violation
July 21, 2010State Administrative/Compliance Order without penalty issued3 linked violations
December 15, 2009State Administrative/Compliance Order without penalty issued1 linked violation
March 11, 2009State Administrative/Compliance Order without penalty issued1 linked violation
July 5, 2007State Administrative/Compliance Order without penalty issued1 linked violation
July 27, 2005State Administrative/Compliance Order without penalty issued1 linked violation

Contact

GONZALEZ, GEORGINA

619-283-6432

LA MESA, CA 91942