MANTECA, CA · San Joaquin County

MANTECA, CITY OF 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): CA3910005
System type: Community Water System
Population served: 84,928
Service connections: 27,552
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring, Regular
—
Nitrate
January 1, 2024 – December 31, 2024
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2013 – September 30, 2013
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2012 – September 30, 2012
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2012 – June 30, 2012
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
October 1, 2011 – December 31, 2011
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2011 – September 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
January 1, 2010 – March 31, 2010
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2009 – June 30, 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
January 1, 2008 – March 31, 2008
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 1993 – May 31, 1993
Resolved
Maximum Contaminant Level Violation, Single Sample
Health-based
Nitrate
July 1, 1987 – July 31, 1987
Archived
Monitoring, Regular
—
Nitrate
July 1, 1987 – July 31, 1987
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Arsenic
July 1, 1987 – July 31, 1987
Archived
Monitoring, Regular
—
Selenium
July 1, 1987 – July 31, 1987
Archived
Notification, Public
—
No contaminant on record
July 1, 1987 – July 31, 1987
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
July 1, 1987 – July 31, 1987
Archived
Monitoring, Regular
—
Arsenic
July 1, 1987 – July 31, 1987
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Fluoride
July 1, 1987 – July 31, 1987
Archived
Monitoring, Regular
—
Fluoride
July 1, 1987 – July 31, 1987
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, 2024 – December 31, 2024	Monitoring, Regular	Nitrate	—	Resolved
July 1, 2013 – September 30, 2013	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2012 – September 30, 2012	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2012 – June 30, 2012	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
October 1, 2011 – December 31, 2011	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 2011 – September 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
January 1, 2010 – March 31, 2010	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2009 – June 30, 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
January 1, 2008 – March 31, 2008	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
May 1, 1993 – May 31, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 1987 – July 31, 1987	Maximum Contaminant Level Violation, Single Sample	Nitrate	Health-based	Archived
July 1, 1987 – July 31, 1987	Monitoring, Regular	Nitrate	—	Archived
July 1, 1987 – July 31, 1987	Maximum Contaminant Level Violation, Single Sample	Arsenic	Health-based	Archived
July 1, 1987 – July 31, 1987	Monitoring, Regular	Selenium	—	Archived
July 1, 1987 – July 31, 1987	Notification, Public	—	—	Archived
July 1, 1987 – July 31, 1987	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
July 1, 1987 – July 31, 1987	Monitoring, Regular	Arsenic	—	Archived
July 1, 1987 – July 31, 1987	Maximum Contaminant Level Violation, Single Sample	Fluoride	Health-based	Archived
July 1, 1987 – July 31, 1987	Monitoring, Regular	Fluoride	—	Archived

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

Enforcement actions

March 6, 2025State Administrative/Compliance Order without penalty issued20 linked violations
November 20, 2013State Compliance achieved101 linked violations

Contact

MONTROSS, GEORGE

209-456-8468

MANTECA, CA 95337