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PWS ID	CA5510008
PWS Name	LAKE DON PEDRO CSD
PWS Type	Community water system
Owner Type	Private
Primary Source	Surface water
Primacy Type	State
Is Wholesaler?	No
Population Served	3240
County Served	Tuolumne

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
MON	Monitoring, Lab Certification/Method Error (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	911025	Returned to Compliance	01-APR-2025	31-MAY-2025	No
RPT	LSL Reporting	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	911024	Open	17-OCT-2024	-	No
TT	LSL Inventory	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	911023	Open	17-OCT-2024	-	Yes
MR	Monitoring, Regular	Nitrate Rule	Nitrate	911022	Returned to Compliance	01-JAN-2024	31-DEC-2024	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	911020	Returned to Compliance	01-OCT-2017	-	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	911019	Returned to Compliance	01-APR-2009	30-JUN-2009	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	911018	Returned to Compliance	01-OCT-2008	31-DEC-2008	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	711017	Returned to Compliance	01-JUL-2007	30-SEP-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	711016	Returned to Compliance	01-JUL-2007	30-SEP-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	711014	Returned to Compliance	01-APR-2007	30-JUN-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	711015	Returned to Compliance	01-APR-2007	30-JUN-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	711012	Returned to Compliance	01-JAN-2007	31-MAR-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	711013	Returned to Compliance	01-JAN-2007	31-MAR-2007	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	711010	Returned to Compliance	01-OCT-2006	31-DEC-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	711011	Returned to Compliance	01-OCT-2006	31-DEC-2006	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	611007	Returned to Compliance	01-JUL-2006	30-SEP-2006	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	611009	Returned to Compliance	01-JUL-2006	30-SEP-2006	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	611008	Returned to Compliance	01-APR-2006	30-JUN-2006	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	611006	Returned to Compliance	01-APR-2006	30-JUN-2006	No
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	611003	Returned to Compliance	01-JAN-2006	31-MAR-2006	Yes
MCL	Maximum Contaminant Level Violation, Average	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	611004	Returned to Compliance	01-JAN-2006	31-MAR-2006	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	611005	Returned to Compliance	01-JAN-2006	31-MAR-2006	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	611002	Returned to Compliance	01-JAN-2006	31-MAR-2006	No
Other	Notification, Public	Miscellaneous Other Rules	-	8908018	Known	01-FEB-1989	28-FEB-1989	No
Other	Notification, Public	Miscellaneous Other Rules	-	8900402	Known	01-FEB-1989	28-FEB-1989	No
Other	Notification, Public	Miscellaneous Other Rules	-	8900400	Known	01-FEB-1989	28-FEB-1989	No
Other	Notification, Public	Miscellaneous Other Rules	-	8908020	Known	01-FEB-1989	28-FEB-1989	No

1 - 27 of 27

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9411008	911025	SOX	State Compliance achieved	15-SEP-2025	State	-
9411006	911022	SOX	State Compliance achieved	18-MAR-2025	State	-
9411004	911020	SIA	State Violation/Reminder Notice	19-NOV-2018	State	-
1011015	611006	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	611007	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	611008	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	611009	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	711010	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	711011	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	711012	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	711013	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	711014	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	711015	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	711016	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	711017	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	911018	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	911019	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	611005	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	611004	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	611003	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE
1011015	611002	SOX	State Compliance achieved	06-MAY-2010	State	ENF_NO:03-11-08O-004; RETURNED TO COMPLIANCE

1 - 21 of 21

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
LAKE MCCLURE - RAW	33968	Yes	Intake	Surface water	Permanent	Active
WELL NO. 3 ABANDONED	62972	Yes	Well	Ground water	Permanent	Inactive
RANCHITO WELL NO. 2	62971	Yes	Well	Ground water	Permanent	Active
WELL NO. 4 ABANDONED	62973	Yes	Well	Ground water	Other	Inactive
MEDINA WELL NO. 2 - STBY	62974	Yes	Well	Ground water	Emergency	Active
MEDINA WELL NO. 1 - STBY	62130	Yes	Well	Ground water	Emergency	Active
RANCHITO WELL NO. 1 - STBY	14777	Yes	Well	Ground water	Emergency	Active
DISTRIBUTION SYSTEM	33967	No	Distribution System/Zone	-	-	Active
LAKE DON PEDRO WTP - TREATED	4116	No	Treatment Plant	-	-	Active

1 - 9 of 9

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
LAKE DON PEDRO WTP - TREATED	4116	Hypochlorination, Post	Disinfection
LAKE DON PEDRO WTP - TREATED	4116	pH Adjustment, Post	Corrosion control
LAKE DON PEDRO WTP - TREATED	4116	Filtration, Pressure Sand	Particulate removal
LAKE DON PEDRO WTP - TREATED	4116	Flocculation	Particulate removal
LAKE DON PEDRO WTP - TREATED	4116	Rapid Mix	Particulate removal
LAKE DON PEDRO WTP - TREATED	4116	Coagulation	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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