RANCHO SAN JOAQUIN MWC

California — Community Water System — PWSID: CA3500581

System Information

PWSID	CA3500581
System Name	RANCHO SAN JOAQUIN MWC
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Private
EPA Region	09
Serves School	No
Wholesaler	No
First Reported	Jan 6, 1994
Last Reported	Nov 17, 2025

Location & Contact

State	California
City	HOLLISTER
ZIP Code	95024
Address	PO Box 1654
Organization	ROCHA, SUSAN
Phone	408-804-1401

Population & Service

Population Served	914
Service Connections	30

Drinking Water Violations (43)

This water system has 43 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
Oct 17, 2024	—	LEAD AND COPPER RULE REVISIONS	TT	Yes	No	—	—	—	Unaddressed	—	Lead and Copper Rule Revisions
Oct 17, 2024	—	LEAD AND COPPER RULE REVISIONS	RPT	No	No	—	—	—	Unaddressed	—	Lead and Copper Rule Revisions
Apr 1, 2024	—	Public Notice	Other	No	No	—	—	—	Resolved	Oct 7, 2024	Public Notice Rule and Revised PN Rule
Apr 1, 2024	—	Public Notice	Other	No	No	—	—	—	Resolved	Oct 7, 2024	Public Notice Rule and Revised PN Rule
Jul 1, 2023	Jun 30, 2024	Arsenic	MCL	Yes	No	.023 MG/L	0.010 mg/L	.01	Archived	Jun 30, 2024	Arsenic Rule
Oct 1, 2022	Sep 30, 2023	Arsenic	MCL	Yes	No	.011 MG/L	0.010 mg/L	.01	Archived	Sep 30, 2023	Arsenic Rule
Jan 1, 2021	Dec 31, 2021	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2021	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021	Dec 31, 2021	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2021	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021	Dec 31, 2021	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2021	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2021	Dec 31, 2021	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2021	Stage 2 Disinfectants and Disinfection Byproducts Rule
Feb 1, 2018	Feb 28, 2018	Revised Total Coliform Rule	MON	No	Yes	—	—	—	Resolved	Feb 28, 2018	Revised Total Coliform Rule
Feb 1, 2018	Feb 28, 2018	Revised Total Coliform Rule	MON	No	Yes	—	—	—	Resolved	Feb 28, 2018	Revised Total Coliform Rule
Oct 1, 2017	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 15, 2018	Lead and Copper Rule
Oct 1, 2017	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 14, 2018	Lead and Copper Rule
Oct 1, 2017	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Sep 14, 2018	Lead and Copper Rule
Oct 1, 2012	Oct 31, 2012	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Oct 31, 2012	Total Coliform Rule
Oct 1, 2012	Oct 31, 2012	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Oct 31, 2012	Total Coliform Rule
Jul 1, 2012	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 5, 2013	Consumer Confidence Rule
Jul 1, 2012	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 5, 2013	Consumer Confidence Rule
Jul 1, 2012	Jul 31, 2012	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jul 31, 2012	Total Coliform Rule
Jul 1, 2012	Jul 31, 2012	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jul 31, 2012	Total Coliform Rule
Jul 1, 2012	Jul 31, 2012	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Jul 31, 2012	Total Coliform Rule
Apr 1, 2012	Jun 30, 2012	Nitrate	MR	No	Yes	—	10 mg/L	—	Archived	Jun 30, 2012	Nitrate Rule
Nov 1, 2006	Nov 30, 2006	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Nov 30, 2006	Total Coliform Rule
Nov 1, 2006	Nov 30, 2006	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Nov 30, 2006	Total Coliform Rule
Jan 1, 2005	Dec 31, 2005	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Resolved	Dec 31, 2005	Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2005	Dec 31, 2005	TTHM	MR	No	Yes	—	0.080 mg/L	—	Resolved	Dec 31, 2005	Stage 1 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2005	Mar 31, 2005	Chlorine	MR	No	Yes	—	4.0 mg/L	—	Resolved	Mar 31, 2005	Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2004	Sep 30, 2004	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Sep 30, 2004	Nitrate Rule
Jul 1, 2004	Sep 30, 2004	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Sep 30, 2004	Nitrate Rule
Aug 1, 1997	Aug 31, 1997	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1997	Total Coliform Rule
Aug 1, 1997	Aug 31, 1997	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1997	Total Coliform Rule
Aug 1, 1997	Aug 31, 1997	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1997	Total Coliform Rule
Aug 1, 1997	Aug 31, 1997	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1997	Total Coliform Rule
Oct 1, 1996	Oct 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Oct 31, 1996	Total Coliform Rule
Oct 1, 1996	Oct 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Oct 31, 1996	Total Coliform Rule
Oct 1, 1996	Oct 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Oct 31, 1996	Total Coliform Rule
Oct 1, 1996	Oct 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Oct 31, 1996	Total Coliform Rule
Oct 1, 1996	Oct 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Oct 31, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule

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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