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PLYMOUTH, CITY OF

California — Community Water System — PWSID: CA0310004

System Information

PWSIDCA0310004
System NamePLYMOUTH, CITY OF
System TypeCommunity Water System
Water SourceSurface Water Purchased
Activity StatusActive
Owner TypeLocal
EPA Region09
Serves SchoolNo
WholesalerNo
First ReportedMar 22, 1979
Last ReportedNov 17, 2025

Location & Contact

StateCalifornia
CityPLYMOUTH
ZIP Code95669
AddressP. O. Box 429
OrganizationROBERTS, MARGARET
Phone209-245-6941

Population & Service

Population Served1,060
Service Connections535

Drinking Water Violations (50)

This water system has 50 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Jul 2, 2025 — LEAD AND COPPER RULE REVISIONS RPT No No — — — Unaddressed — Lead and Copper Rule Revisions
Oct 1, 2021 Dec 31, 2021 TTHM MCL Yes No .081 MG/L 0.080 mg/L .08 Resolved Dec 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Oct 1, 2021 Dec 31, 2021 TTHM MCL Yes No .081 MG/L 0.080 mg/L .08 Resolved Dec 31, 2021 Stage 2 Disinfectants and Disinfection Byproducts Rule
Aug 1, 2017 Aug 31, 2017 Revised Total Coliform Rule MON No No — — — Resolved Aug 31, 2017 Revised Total Coliform Rule
Aug 1, 2017 Aug 31, 2017 Revised Total Coliform Rule MON No No — — — Resolved Aug 31, 2017 Revised Total Coliform Rule
Jun 1, 2017 Jun 30, 2017 Revised Total Coliform Rule MON No No — — — Resolved Jun 30, 2017 Revised Total Coliform Rule
Jun 1, 2017 Jun 30, 2017 Revised Total Coliform Rule MON No No — — — Resolved Jun 30, 2017 Revised Total Coliform Rule
Apr 1, 2017 Jun 30, 2017 TTHM MCL Yes No .081 MG/L 0.080 mg/L .08 Resolved Jun 30, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Apr 1, 2017 Jun 30, 2017 TTHM MCL Yes No .081 MG/L 0.080 mg/L .08 Resolved Jun 30, 2017 Stage 2 Disinfectants and Disinfection Byproducts Rule
Dec 1, 2016 Dec 31, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2016 Revised Total Coliform Rule
Dec 1, 2016 Dec 31, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Dec 31, 2016 Revised Total Coliform Rule
Apr 1, 2016 Apr 30, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2016 Revised Total Coliform Rule
Apr 1, 2016 Apr 30, 2016 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2016 Revised Total Coliform Rule
Jan 1, 2005 Jan 31, 2005 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Jan 31, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2005 Jan 31, 2005 TTHM MR No Yes — 0.080 mg/L — Resolved Jan 31, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2005 Jan 31, 2005 TTHM MR No Yes — 0.080 mg/L — Resolved Jan 31, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2005 Jan 31, 2005 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Jan 31, 2005 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2001 — Consumer Confidence Rule Other No No — — — Resolved Nov 20, 2001 Consumer Confidence Rule
Jul 1, 2001 — Consumer Confidence Rule Other No No — — — Resolved Nov 20, 2001 Consumer Confidence Rule
Jan 26, 2000 Jan 25, 2001 Nitrate MR No Yes — 10 mg/L — Resolved Jan 25, 2001 Nitrate Rule
Jan 26, 2000 Jan 25, 2001 Nitrate MR No Yes — 10 mg/L — Resolved Jan 25, 2001 Nitrate Rule
Jan 25, 2000 Jan 24, 2001 Nitrate-Nitrite MR No Yes — — — Resolved Jan 24, 2001 Nitrate Rule
Jan 25, 2000 Jan 24, 2001 Nitrate-Nitrite MR No Yes — — — Resolved Jan 24, 2001 Nitrate Rule
Jan 25, 2000 Jan 24, 2001 Nitrite MR No Yes — 1 mg/L — Resolved Jan 24, 2001 Nitrate Rule
Jan 25, 2000 Jan 24, 2001 Nitrite MR No Yes — 1 mg/L — Resolved Jan 24, 2001 Nitrate Rule
Jan 26, 1999 Jan 25, 2000 Nitrate MR No Yes — 10 mg/L — Resolved Jan 25, 2000 Nitrate Rule
Jan 26, 1999 Jan 25, 2000 Nitrate MR No Yes — 10 mg/L — Resolved Jan 25, 2000 Nitrate Rule
Jan 25, 1999 Jan 24, 2000 Nitrite MR No Yes — 1 mg/L — Resolved Jan 24, 2000 Nitrate Rule
Jan 25, 1999 Jan 24, 2000 Nitrite MR No Yes — 1 mg/L — Resolved Jan 24, 2000 Nitrate Rule
Jan 25, 1999 Jan 24, 2000 Nitrate-Nitrite MR No Yes — — — Resolved Jan 24, 2000 Nitrate Rule
Jan 25, 1999 Jan 24, 2000 Nitrate-Nitrite MR No Yes — — — Resolved Jan 24, 2000 Nitrate Rule
Jan 26, 1998 Jan 25, 1999 Nitrate MR No Yes — 10 mg/L — Resolved Jan 25, 1999 Nitrate Rule
Jan 26, 1998 Jan 25, 1999 Nitrate MR No Yes — 10 mg/L — Resolved Jan 25, 1999 Nitrate Rule
Jan 25, 1998 Jan 24, 1999 Nitrate-Nitrite MR No Yes — — — Resolved Jan 24, 1999 Nitrate Rule
Jan 25, 1998 Jan 24, 1999 Nitrite MR No Yes — 1 mg/L — Resolved Jan 24, 1999 Nitrate Rule
Jan 25, 1998 Jan 24, 1999 Nitrite MR No Yes — 1 mg/L — Resolved Jan 24, 1999 Nitrate Rule
Jan 25, 1998 Jan 24, 1999 Nitrate-Nitrite MR No Yes — — — Resolved Jan 24, 1999 Nitrate Rule
Feb 1, 1997 Feb 28, 1997 Coliform (TCR) MR No No — 5% of samples — Resolved Feb 28, 1997 Total Coliform Rule
Jan 26, 1997 Jan 25, 1998 Nitrate MR No Yes — 10 mg/L — Resolved Jan 25, 1998 Nitrate Rule
Jan 26, 1997 Jan 25, 1998 Nitrate MR No Yes — 10 mg/L — Resolved Jan 25, 1998 Nitrate Rule
Jan 25, 1997 Jan 24, 1998 Nitrite MR No Yes — 1 mg/L — Resolved Jan 24, 1998 Nitrate Rule
Jan 25, 1997 Jan 24, 1998 Nitrate-Nitrite MR No Yes — — — Resolved Jan 24, 1998 Nitrate Rule
Jan 25, 1997 Jan 24, 1998 Nitrate-Nitrite MR No Yes — — — Resolved Jan 24, 1998 Nitrate Rule
Jan 25, 1997 Jan 24, 1998 Nitrite MR No Yes — 1 mg/L — Resolved Jan 24, 1998 Nitrate Rule
Jul 1, 1994 Jul 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 1994 Total Coliform Rule
Jul 1, 1994 Jul 31, 1994 Coliform (TCR) MCL Yes No — 5% of samples — Resolved Jul 31, 1994 Total Coliform Rule
Jul 1, 1993 Jul 31, 1993 Surface Water Treatment Rule TT Yes No — — — Resolved Jul 31, 1993 Surface Water Treatment Rule
— — — No No — — — — — —
— — — No No — — — — — —
— — — No No — — — — — —

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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