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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.

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Violations

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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	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	55720	Returned to Compliance	01-OCT-2021	31-DEC-2021	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	55719	Returned to Compliance	01-OCT-2017	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	55717	Returned to Compliance	01-JUN-2015	31-AUG-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	55716	Returned to Compliance	01-JUN-2015	31-AUG-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	55714	Returned to Compliance	01-MAR-2015	31-MAY-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	55715	Returned to Compliance	01-MAR-2015	31-MAY-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	55712	Returned to Compliance	01-JAN-2015	28-FEB-2015	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	55713	Returned to Compliance	01-JAN-2015	28-FEB-2015	No
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	55710	Returned to Compliance	01-APR-2012	30-APR-2012	Yes
TT	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	55711	Returned to Compliance	01-MAR-2012	31-MAR-2012	Yes
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	55709	Returned to Compliance	01-SEP-2010	30-SEP-2010	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Bromate	55607	Returned to Compliance	01-JAN-2006	31-MAR-2006	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	55003	Returned to Compliance	01-DEC-2002	31-DEC-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54903	Returned to Compliance	01-NOV-2002	30-NOV-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54803	Returned to Compliance	01-OCT-2002	31-OCT-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54703	Returned to Compliance	01-SEP-2002	30-SEP-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54603	Returned to Compliance	01-AUG-2002	31-AUG-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54503	Returned to Compliance	01-JUL-2002	31-JUL-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54403	Returned to Compliance	01-JUN-2002	30-JUN-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54303	Returned to Compliance	01-MAY-2002	31-MAY-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54203	Returned to Compliance	01-APR-2002	30-APR-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54103	Returned to Compliance	01-MAR-2002	31-MAR-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	54003	Returned to Compliance	01-FEB-2002	28-FEB-2002	No
MR	Monitoring of Treatment (SWTR-Unfilt/GWR)	Surface Water Treatment Rule	Surface Water Treatment Rule	53903	Returned to Compliance	01-JAN-2002	31-JAN-2002	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	499	Known	01-JUL-1999	31-JUL-1999	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	292	Known	01-FEB-1992	29-FEB-1992	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	192	Known	01-JAN-1992	31-JAN-1992	No

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Enforcement Actions

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Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
21233	55720	SIF	State Public Notification received	07-MAR-2022	State	-
21229	55719	SOX	State Compliance achieved	30-APR-2018	State	-
21224	55712	SOX	State Compliance achieved	07-SEP-2016	State	-
21224	55717	SOX	State Compliance achieved	07-SEP-2016	State	-
21224	55716	SOX	State Compliance achieved	07-SEP-2016	State	-
21224	55715	SOX	State Compliance achieved	07-SEP-2016	State	-
21224	55714	SOX	State Compliance achieved	07-SEP-2016	State	-
21224	55713	SOX	State Compliance achieved	07-SEP-2016	State	-
21215	55710	SFO	State Administrative/Compliance Order with penalty issued	25-JUL-2012	State	During the timeframe of March 29 to April 13, 2012, the ZWUD PWS was in alleged non-compliance with treatment technique, monitoring, reporting and operator certification requirements required by Nevada Public Water Systems Law. It is further alleged that the Douglas County Utilities is not applying assignments for adequate staffing amongst all of the PWSs that it owns and operates to ensure a qualified operator in responsible charge can perform the necessary duties required by Nevada Public Water Systems Law.
21215	55711	SFO	State Administrative/Compliance Order with penalty issued	25-JUL-2012	State	During the timeframe of March 29 to April 13, 2012, the ZWUD PWS was in alleged non-compliance with treatment technique, monitoring, reporting and operator certification requirements required by Nevada Public Water Systems Law. It is further alleged that the Douglas County Utilities is not applying assignments for adequate staffing amongst all of the PWSs that it owns and operates to ensure a qualified operator in responsible charge can perform the necessary duties required by Nevada Public Water Systems Law.
21212	55709	SIE	State Public Notification requested	27-JAN-2011	State	-
21207	55607	SIE	State Public Notification requested	21-JUN-2007	State	-
20703	54603	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54703	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54803	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54903	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54303	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54203	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54103	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54003	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	53903	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54503	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	54403	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002
20703	55003	SOX	State Compliance achieved	16-MAY-2003	State	HAVE RESUMED WEEK END MONITORING AS OF DECEMBER 2002

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All Facilities

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Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
LAKE TAHOE INTAKE	2597	Yes	Intake	Surface water	Permanent	Active
DISTRIBUTION SYSTEM	1345	No	Distribution System/Zone	-	-	Active
PF LAKE PUMP RAW WATER	10387	No	Pump Facility	-	-	Active
TP PUMP STATION TREATED WATER	5577	No	Pump Facility	-	-	Active
STORAGE TANK 625K	2096	No	Storage	-	-	Active
LAKE TAHOE DISINFECTION PLANT	7580	No	Treatment Plant	-	-	Active
LAKE TAHOE DISINFECTION PLANT	2598	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
LAKE TAHOE DISINFECTION PLANT	2598	Hypochlorination, Post	Disinfection
LAKE TAHOE DISINFECTION PLANT	2598	Hypochlorination, Post	Disinfection
LAKE TAHOE DISINFECTION PLANT	2598	Ozonation, Pre	Disinfection
LAKE TAHOE DISINFECTION PLANT	7580	Ultraviolet Radiation	Disinfection
LAKE TAHOE DISINFECTION PLANT	7580	4-Log Treatment of Viruses	Disinfection
LAKE TAHOE DISINFECTION PLANT	7580	Reducing Agents	De-chlorination
LAKE TAHOE DISINFECTION PLANT	7580	3-Log Remove/Inactivate G Lamblia	Disinfection
LAKE TAHOE DISINFECTION PLANT	7580	2-Log Remove Crypto	Disinfection
LAKE TAHOE DISINFECTION PLANT	7580	Hypochlorination, Post	Disinfection
LAKE TAHOE DISINFECTION PLANT	7580	Ozonation, Pre	Disinfection

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