LATHROP, CA · San Joaquin County

CITY OF LATHROP 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): CA3910015
System type: Community Water System
Population served: 35,080
Service connections: 11,185
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Maximum Contaminant Level Violation, Average
Health-based
Combined Uranium
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
Combined Uranium
January 1, 2013 – March 31, 2013
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
October 1, 2010 – December 31, 2010
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2010 – June 30, 2010
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2009 – December 31, 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, Average
Health-based
Arsenic
October 1, 2008 – December 31, 2008
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2008 – June 30, 2008
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
January 1, 2008 – March 31, 2008
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2007 – December 31, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2007 – June 30, 2007
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2005 – March 3, 2006
Resolved
Notification, Public
—
No contaminant on record
October 1, 1987 – October 31, 1987
Archived
Notification, Public
—
No contaminant on record
August 1, 1985 – August 31, 1985
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
April 1, 2014 – June 30, 2014	Maximum Contaminant Level Violation, Average	Combined Uranium	Health-based	Resolved
January 1, 2014 – March 31, 2014	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2013 – March 31, 2013	Maximum Contaminant Level Violation, Average	Combined Uranium	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
October 1, 2010 – December 31, 2010	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2010 – June 30, 2010	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2009 – December 31, 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
October 1, 2008 – December 31, 2008	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2008 – June 30, 2008	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
January 1, 2008 – March 31, 2008	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2007 – December 31, 2007	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2007 – June 30, 2007	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2005 – March 3, 2006	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 1, 1987 – October 31, 1987	Notification, Public	—	—	Archived
August 1, 1985 – August 31, 1985	Notification, Public	—	—	Archived

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

Enforcement actions

July 1, 2012State Compliance achieved41 linked violations
December 26, 2008State Administrative/Compliance Order without penalty issued23 linked violations
March 3, 2006State Administrative/Compliance Order without penalty issued1 linked violation
March 3, 2006State Compliance achieved1 linked violation
November 30, 1993State Violation/Reminder Notice26 linked violations

Contact

KING, MICHAEL

209-941-7454

LATHROP, CA 95330