Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	CA5010039
PWS Name	WESTERN HILLS WATER DISTRICT/DIABLO GRAN
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	2000
County Served	Stanislaus

The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by treatment technique, MRDL, monitoring, reporting, and other violations.

Health-based	Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.
Maximum Contaminant Level or MCL	The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Treatment Technique	A required process intended to reduce the level of a contaminant in drinking water.
Maximum residual disinfectant level or MRDL	The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Monitoring & reporting	Failure to conduct regular monitoring of drinking water quality, as required by SDWA, or to submit monitoring results in a timely fashion to the primacy agency or EPA.
Public notification & other	Failure to provide notification to the public as required by the Violations of Public Notification Rule and the Consumer Confidence Report Rule, and violations of other requirements such as those violations related to variances and exemptions.

Violations

Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	1010055	Returned to Compliance	01-JAN-2018	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1010054	Returned to Compliance	01-JAN-2017	31-MAR-2017	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1010052	Returned to Compliance	01-OCT-2016	31-DEC-2016	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	1010053	Returned to Compliance	01-OCT-2016	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1010051	Returned to Compliance	01-JUL-2016	30-SEP-2016	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1010050	Returned to Compliance	01-APR-2016	30-JUN-2016	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	1010049	Returned to Compliance	01-OCT-2015	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1010048	Returned to Compliance	01-JAN-2015	31-MAR-2015	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1010047	Returned to Compliance	01-OCT-2014	31-DEC-2014	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1010046	Returned to Compliance	01-JUL-2014	30-SEP-2014	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	1010045	Returned to Compliance	01-OCT-2009	31-DEC-2009	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	910044	Returned to Compliance	01-JUL-2009	30-SEP-2009	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	910043	Returned to Compliance	01-JUL-2009	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	910042	Returned to Compliance	01-APR-2009	30-JUN-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	910041	Returned to Compliance	01-JAN-2009	31-MAR-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	910039	Returned to Compliance	01-OCT-2008	31-DEC-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	810038	Returned to Compliance	01-JUL-2008	30-SEP-2008	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	810036	Returned to Compliance	01-JUN-2008	30-JUN-2008	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	810034	Returned to Compliance	01-JUN-2008	30-JUN-2008	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	810035	Returned to Compliance	01-MAY-2008	31-MAY-2008	No
MR	Monitoring of Treatment (SWTR-Filter)	Surface Water Treatment Rule	Surface Water Treatment Rule	810033	Returned to Compliance	01-MAY-2008	31-MAY-2008	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	810040	Returned to Compliance	01-APR-2008	30-JUN-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	810032	Returned to Compliance	01-JAN-2008	31-MAR-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	810031	Returned to Compliance	01-OCT-2007	31-DEC-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	710030	Returned to Compliance	01-JUL-2007	30-SEP-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	610029	Returned to Compliance	01-JUL-2006	30-SEP-2006	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	610046	Returned to Compliance	01-MAY-2006	27-JUN-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	610028	Returned to Compliance	01-APR-2006	30-JUN-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	610027	Returned to Compliance	01-APR-2006	30-JUN-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	610024	Returned to Compliance	01-JAN-2006	31-MAR-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	610026	Returned to Compliance	01-JAN-2006	31-MAR-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	610025	Returned to Compliance	01-OCT-2005	31-DEC-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	610023	Returned to Compliance	01-OCT-2005	31-DEC-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	510022	Returned to Compliance	01-JUL-2005	30-SEP-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	510018	Returned to Compliance	01-JUL-2005	30-SEP-2005	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	510012	Returned to Compliance	01-JUL-2005	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	510021	Returned to Compliance	01-APR-2005	30-JUN-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	510017	Returned to Compliance	01-APR-2005	30-JUN-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	510020	Returned to Compliance	01-JAN-2005	31-MAR-2005	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	510016	Returned to Compliance	01-JAN-2005	31-MAR-2005	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	510008	Returned to Compliance	01-NOV-2004	30-NOV-2004	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	510015	Returned to Compliance	01-OCT-2004	31-DEC-2004	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	510010	Returned to Compliance	01-OCT-2004	31-OCT-2004	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	510019	Returned to Compliance	01-OCT-2004	31-DEC-2004	Yes

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Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
1110035	1010055	SOX	State Compliance achieved	16-MAR-2021	State	RTC after lead and copper samples were collected in 2019 - MK
1110033	1010045	SOX	State Compliance achieved	16-JUL-2019	State	returned to compliance
1110034	610046	SOX	State Compliance achieved	16-JUL-2019	State	returned to compliance
1110029	1010052	SOX	State Compliance achieved	10-MAY-2018	State	TTHM issued resolved, aeration installed
1110029	1010054	SOX	State Compliance achieved	10-MAY-2018	State	TTHM issued resolved, aeration installed
1110029	1010048	SOX	State Compliance achieved	10-MAY-2018	State	TTHM issued resolved, aeration installed
1110029	1010050	SOX	State Compliance achieved	10-MAY-2018	State	TTHM issued resolved, aeration installed
1110029	1010046	SOX	State Compliance achieved	10-MAY-2018	State	TTHM issued resolved, aeration installed
1110029	1010051	SOX	State Compliance achieved	10-MAY-2018	State	TTHM issued resolved, aeration installed
1110029	1010047	SOX	State Compliance achieved	10-MAY-2018	State	TTHM issued resolved, aeration installed
1110027	1010053	SOX	State Compliance achieved	01-NOV-2016	State	-
1110028	1010049	SOX	State Compliance achieved	30-APR-2016	State	-
1110023	610027	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	610029	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	710030	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	810031	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	810032	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	810038	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	810040	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	910039	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	910041	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	910042	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	910044	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	610026	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	610025	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	610024	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	610023	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	510022	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	510021	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	510020	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	510019	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	510018	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	510017	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	510016	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	510015	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1110023	610028	SOX	State Compliance achieved	31-MAR-2010	State	SYSTEM BEGAN CHLORAMINATING
1010022	910043	SOX	State Compliance achieved	02-JUL-2009	State	RETURNED TO COMPLIANCE
910016	810036	SOX	State Compliance achieved	21-JUL-2008	State	ENF_NO:0810012; RETURNED TO COMPLIANCE
910016	810035	SOX	State Compliance achieved	21-JUL-2008	State	ENF_NO:0810012; RETURNED TO COMPLIANCE
910016	810034	SOX	State Compliance achieved	21-JUL-2008	State	ENF_NO:0810012; RETURNED TO COMPLIANCE
910016	810033	SOX	State Compliance achieved	21-JUL-2008	State	ENF_NO:0810012; RETURNED TO COMPLIANCE
510005	510012	SOX	State Compliance achieved	23-AUG-2005	State	RETURN TO COMPLIANCE
1110031	510008	SOX	State Compliance achieved	30-DEC-2004	State	This TCR violation has been closed with this SOX enforcement record due to rTCR implementation on 4/1/2016.
1110032	510010	SOX	State Compliance achieved	30-NOV-2004	State	This TCR violation has been closed with this SOX enforcement record due to rTCR implementation on 4/1/2016.

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All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
RAW SURFACE WATER FROM CA AQUEDUCT	33414	Yes	Intake	Surface water	Permanent	Active
WELL 01-FROG POND REPLACEMENT WELL-ABND	8257	Yes	Well	Ground water	Other	Inactive
WELL 02 - YF-6 WELL - ABANDONED	8256	Yes	Well	Ground water	Other	Inactive
SQUIRREL WELL - RAW - INACTIVE	21997	Yes	Well	Ground water under the influence of surface water	Other	Inactive
DISTRIBUTION SYSTEM	33413	No	Distribution System/Zone	-	-	Active
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	No	Treatment Plant	-	-	Active
SQUIRREL WELL - TREATED - INACTIVE	6667	No	Treatment Plant	-	-	Inactive

1 - 7 of 7

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	pH Adjustment, Post	Corrosion control
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	Hypochlorination, Post	Disinfection
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	Reverse Osmosis	Inorganics removal
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	Reverse Osmosis	Manganese removal
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	Reverse Osmosis	Iron removal
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	Filtration, Ultrafiltration	Particulate removal
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	Filtration, Cartridge	Particulate removal
SURFACE WATER TREATMENT PLANT EFFLUENT	2088	Filtration, Rapid Sand	Particulate removal

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For more information on a Water System:
Ask the operators of your water system, contact your primacy agency or file a Freedom of Information Act (FOIA) request.
Drinking water in general: Find out more about your drinking water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared a table about various regulated drinking water contaminants.
Tools for accessing EPA drinking water data: Safe Drinking Water Information System (SDWIS) Federal Reporting Services and Drinking Water Performance and Results Report.
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these contaminants, please see the National Contaminant Occurrence Database.

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