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PWS ID	CA2410018
PWS Name	SANTA NELLA COUNTY WATER DISTRICT
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	2211
County Served	Merced

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
MCL	Maximum Contaminant Level Violation, Average	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	9611002	Returned to Compliance	01-JUL-2014	30-SEP-2014	Yes
TT	Treatment Technique Precursor Removal	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	1211020	Returned to Compliance	01-OCT-2011	31-DEC-2011	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	1011019	Returned to Compliance	01-APR-2010	30-JUN-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	1011018	Returned to Compliance	01-JAN-2010	31-MAR-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	911017	Returned to Compliance	01-APR-2009	30-JUN-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	911016	Returned to Compliance	01-JAN-2009	31-MAR-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	911014	Returned to Compliance	01-OCT-2008	31-DEC-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	811013	Returned to Compliance	01-JUL-2008	30-SEP-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	811012	Returned to Compliance	01-APR-2008	30-JUN-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	811009	Returned to Compliance	01-JAN-2008	31-MAR-2008	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	811008	Returned to Compliance	01-JAN-2008	31-JAN-2008	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	511007	Returned to Compliance	01-OCT-2004	31-DEC-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	411006	Returned to Compliance	01-JUL-2004	30-SEP-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	411005	Returned to Compliance	01-APR-2004	30-JUN-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	511002	Returned to Compliance	01-JAN-2004	31-MAR-2004	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	511004	Returned to Compliance	01-JAN-2004	31-MAR-2004	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	CARBON, TOTAL	411003	Returned to Compliance	01-JAN-2004	31-MAR-2004	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Radium-228	111011	Returned to Compliance	01-JAN-2001	31-DEC-2007	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	9611001	Returned to Compliance	02-JAN-1996	-	No

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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
9311008	9611002	SOX	State Compliance achieved	01-MAR-2018	State	RTC'ed in 2018 as part of SDWIS Clean Up Week
1211013	1211020	SOX	State Compliance achieved	31-MAR-2012	State	ENF_NO:03-11-12C-005; RET TO COMPLIANCE
1211013	411003	SOX	State Compliance achieved	31-MAR-2012	State	ENF_NO:03-11-12C-005; RET TO COMPLIANCE
1211011	811012	SOX	State Compliance achieved	18-JUL-2011	State	ENF_NO:03-11-07O-006; RET TO COMPLIANCE
1211011	1011019	SOX	State Compliance achieved	18-JUL-2011	State	ENF_NO:03-11-07O-006; RET TO COMPLIANCE
1211011	1011018	SOX	State Compliance achieved	18-JUL-2011	State	ENF_NO:03-11-07O-006; RET TO COMPLIANCE
1211011	911017	SOX	State Compliance achieved	18-JUL-2011	State	ENF_NO:03-11-07O-006; RET TO COMPLIANCE
1211011	911016	SOX	State Compliance achieved	18-JUL-2011	State	ENF_NO:03-11-07O-006; RET TO COMPLIANCE
1211011	911014	SOX	State Compliance achieved	18-JUL-2011	State	ENF_NO:03-11-07O-006; RET TO COMPLIANCE
1211011	811013	SOX	State Compliance achieved	18-JUL-2011	State	ENF_NO:03-11-07O-006; RET TO COMPLIANCE
1211011	811009	SOX	State Compliance achieved	18-JUL-2011	State	ENF_NO:03-11-07O-006; RET TO COMPLIANCE
811006	411006	SFL	State Administrative/Compliance Order without penalty issued	29-APR-2008	State	ENF_NO:03-11-07O-006; TTHM MCL 1ST QUARTER 2008
811006	511002	SFL	State Administrative/Compliance Order without penalty issued	29-APR-2008	State	ENF_NO:03-11-07O-006; TTHM MCL 1ST QUARTER 2008
811006	411005	SFL	State Administrative/Compliance Order without penalty issued	29-APR-2008	State	ENF_NO:03-11-07O-006; TTHM MCL 1ST QUARTER 2008
811006	511007	SFL	State Administrative/Compliance Order without penalty issued	29-APR-2008	State	ENF_NO:03-11-07O-006; TTHM MCL 1ST QUARTER 2008
811006	511004	SFL	State Administrative/Compliance Order without penalty issued	29-APR-2008	State	ENF_NO:03-11-07O-006; TTHM MCL 1ST QUARTER 2008
811008	111011	SIA	State Violation/Reminder Notice	25-APR-2008	State	ENF_NO:03-11-08E-023; INITIAL RADIOLOGIAL M&R
811005	811008	SIA	State Violation/Reminder Notice	04-MAR-2008	State	ENF_NO:03-11-08E-008; JAN 2008 TCR MR3 PARTIAL SAMPLING
9311009	9611001	SOX	State Compliance achieved	30-SEP-2002	State	RTC'ed in 2018 as part of SDWIS Clean Up Week

1 - 19 of 19

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CALIFORNIA AQUEDUCT - RAW	29199	Yes	Intake	Surface water	Permanent	Active
WELL 01	17604	Yes	Well	Ground water	Permanent	Active
DISTRIBUTION SYSTEM	29200	No	Distribution System/Zone	-	-	Active
SANTA NELLA WTP - TREATED	4129	No	Treatment Plant	-	-	Active
WELL 01 - TRT CL	74400	No	Treatment Plant	-	-	Active

1 - 5 of 5

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
SANTA NELLA WTP - TREATED	4129	Gaseous Chlorination, Pre	Disinfection
SANTA NELLA WTP - TREATED	4129	pH Adjustment, Post	Corrosion control
SANTA NELLA WTP - TREATED	4129	Gaseous Chlorination, Post	Disinfection
SANTA NELLA WTP - TREATED	4129	Filtration, Rapid Sand	Particulate removal
SANTA NELLA WTP - TREATED	4129	Sedimentation	Particulate removal
SANTA NELLA WTP - TREATED	4129	Flocculation	Particulate removal
SANTA NELLA WTP - TREATED	4129	Coagulation	Particulate removal
SANTA NELLA WTP - TREATED	4129	Rapid Mix	Particulate removal
WELL 01 - TRT CL	74400	Hypochlorination, Post	Disinfection

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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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