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Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	090605107
PWS Name	Yocha Dehe Potable Water System
PWS Type	Community water system
Owner Type	Tribal Government
Primary Source	Ground water
Primacy Type	Tribal
Is Wholesaler?	No
Population Served	12800
County Served

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	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Uranium	060510703400672023	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	060510703401072023	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	060510703400072023	Returned to Compliance	01-JUL-2023	30-SEP-2023	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endrin	060510703200512023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	BHC-GAMMA	060510703201012023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Methoxychlor	060510703201512023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Toxaphene	060510703202012023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Hexachlorocyclopentadiene	060510703204212023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor	060510703206512023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor epoxide	060510703206712023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Total Polychlorinated Biphenyls (PCB)	060510703238312023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	060510703294612023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	HEXACHLOROBENZENE	060510703227412023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	1,2-DIBROMO-3-CHLOROPROPANE	060510703293112023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Chlordane	060510703295912023	Known	01-JAN-2023	31-DEC-2025	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	060510730245612015	Returned to Compliance	01-JAN-2015	31-DEC-2015	No
MR	Monitoring, Routine (IDSE)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	060510730295012015	Returned to Compliance	01-JAN-2015	31-DEC-2015	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	060510722310042007	Returned to Compliance	01-APR-2007	30-APR-2007	Yes
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	060510721310082005	Returned to Compliance	01-AUG-2005	31-AUG-2005	Yes
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	060510724310072005	Returned to Compliance	01-JUL-2005	31-JUL-2005	No

1 - 20 of 20

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
0605107OX11172311656	060510703400672023	EOX	Federal Compliance achieved	17-NOV-2023	Region	Subsequent reporting of required results.
0605107OX11172311657	060510703400072023	EOX	Federal Compliance achieved	17-NOV-2023	Region	Subsequent reporting of required results.
0605107OX11172311656	060510703401072023	EOX	Federal Compliance achieved	17-NOV-2023	Region	Subsequent reporting of required results.
0605107OX09191685834	060510730245612015	EOX	Federal Compliance achieved	19-SEP-2016	Region	sampled 8/3/16
0605107OX09191685833	060510730295012015	EOX	Federal Compliance achieved	19-SEP-2016	Region	sampled 8/3/16
0605107OX01211044571	060510722310042007	EOX	Federal Compliance achieved	21-JAN-2010	Region	-
0605107OX01211044570	060510721310082005	EOX	Federal Compliance achieved	21-JAN-2010	Region	-
0605107OX01211044569	060510724310072005	EOX	Federal Compliance achieved	21-JAN-2010	Region	-

1 - 8 of 8

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
S-1	0605107GW001	Yes	Well	Ground water	Permanent	Active
Well 2 (Community Well)	0605107GW004	Yes	Well	Ground water	Permanent	Active
S-3	0605107GW003	Yes	Well	Ground water	Permanent	Active
S-2	0605107GW002	Yes	Well	Ground water	Permanent	Active
Entry Point for Wells S-1,S-2 and S-3	0605107EP001	No	Common Headers	-	-	Active
Entry Point for Well 2	0605107EP002	No	Common Headers	-	-	Active
Distribution system for PWSID# 0605107	0605107DS001	No	Distribution System/Zone	-	-	Active
Common Header for Wells s-1, s-2 and s-3	0605107CH001	No	Other	-	-	Active
Pressure Control Assembly	0605107HP002	No	Pressure Control	-	-	Active
Pressure Control Assembly for Kisi	0605107HP003	No	Pressure Control	-	-	Active
Pressure Control Assembly	0605107HP001	No	Pressure Control	-	-	Inactive
Pumping Facility	0605107PF001	No	Pump Facility	-	-	Active
Pump Facility for TP003	0605107PF002	No	Pump Facility	-	-	Active
Kisi Pumping Facility	0605107PF003	No	Pump Facility	-	-	Active
1.1 MG Tank for Finished Water	0605107ST001	No	Storage	-	-	Active
20KG Tank for Raw Water	0605107ST002	No	Storage	-	-	Active
Storage Tank 1	0605107ST003	No	Storage	-	-	Active
Tank 2	0605107ST004	No	Storage	-	-	Active
EDR Reject Water Tank	0605107ST005	No	Storage	-	-	Active
Kisi Tank 1	0605107ST006	No	Storage	-	-	Active
Kisi Tank 2	0605107ST007	No	Storage	-	-	Active
Emergency Disinfection for Wells S1, S2 & S3	0605107TP002	No	Treatment Plant	-	-	Active
EDR Treatment Plant	0605107TP003	No	Treatment Plant	-	-	Active
Treatment for Well 2	0605107TP004	No	Treatment Plant	-	-	Active
Kisi Disinfection	0605107TP005	No	Treatment Plant	-	-	Active
Disinfection for S-1	0605107TP001	No	Treatment Plant	-	-	Inactive

1 - 26 of 26

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
Emergency Disinfection for Wells S1, S2 & S3	0605107TP002	Hypochlorination, Post	Disinfection
EDR Treatment Plant	0605107TP003	Electrodialysis	Softening (hardness removal)
EDR Treatment Plant	0605107TP003	Hypochlorination, Post	Disinfection
EDR Treatment Plant	0605107TP003	Electrodialysis	Inorganics removal
Treatment for Well 2	0605107TP004	Hypochlorination, Post	Disinfection
Kisi Disinfection	0605107TP005	Hypochlorination, Post	Disinfection

1 - 6 of 6

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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