Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	055294503
PWS Name	LOWER SIOUX
PWS Type	Community water system
Owner Type	Tribal Government
Primary Source	Ground water
Primacy Type	Tribal
Is Wholesaler?	No
Population Served	4000
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
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	1009637	Returned to Compliance	26-JUN-2025	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	1009635	Returned to Compliance	02-JUL-2024	-	No
RPT	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	1009634	Returned to Compliance	01-MAY-2024	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	1009636	Returned to Compliance	01-MAY-2024	31-MAY-2024	No
RPT	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	1009633	Returned to Compliance	01-OCT-2023	-	No
RPT	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	1009632	Returned to Compliance	01-AUG-2023	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	1009598	Returned to Compliance	01-JAN-2020	31-DEC-2020	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	1009597	Returned to Compliance	01-JAN-2020	31-DEC-2020	No
MR	Monitoring, Regular	Nitrate Rule	Nitrate	1009563	Returned to Compliance	01-JAN-2019	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Benzo(a)pyrene	1009591	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	HEXACHLOROBENZENE	1009590	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,4,5-TP	1009589	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,4-D	1009588	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Total Polychlorinated Biphenyls (PCB)	1009593	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor epoxide	1009587	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Heptachlor	1009586	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	2,3,7,8-TCDD	1009585	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	LASSO	1009584	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Atrazine	1009583	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Aldicarb	1009582	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Carbofuran	1009581	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Aldicarb sulfoxide	1009579	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Hexachlorocyclopentadiene	1009578	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dinoseb	1009577	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Picloram	1009576	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) phthalate	1009575	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Simazine	1009574	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	OXAMYL	1009573	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Di(2-ethylhexyl) adipate	1009572	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Glyphosate	1009571	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endothall	1009570	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Diquat	1009569	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Dalapon	1009568	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Toxaphene	1009567	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Methoxychlor	1009566	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	BHC-GAMMA	1009565	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Endrin	1009564	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Pentachlorophenol	1009592	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Chlordane	1009596	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	1,2-DIBROMO-3-CHLOROPROPANE	1009594	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	ETHYLENE DIBROMIDE	1009595	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
MR	Monitoring, Regular	Synthetic Organic Chemicals	Aldicarb sulfone	1009580	Returned to Compliance	01-JAN-2017	31-DEC-2019	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	1009527	Returned to Compliance	01-JUL-2014	-	No
MR	Monitoring, Regular	Inorganic Chemicals	Antimony, Total	1009558	Returned to Compliance	01-JAN-2014	31-DEC-2016	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	1009549	Returned to Compliance	01-JAN-2014	31-DEC-2016	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	1009548	Returned to Compliance	01-JAN-2014	31-DEC-2016	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	1009547	Returned to Compliance	01-JAN-2014	31-DEC-2016	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	1009546	Returned to Compliance	01-JAN-2014	31-DEC-2016	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	1009545	Returned to Compliance	01-JAN-2014	31-DEC-2016	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	1009544	Returned to Compliance	01-JAN-2014	31-DEC-2016	No

1 - 50 of 134

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
32257	1009634	EIA	Federal Violation/Reminder Notice	10-SEP-2025	Region	-
32257	1009637	EIA	Federal Violation/Reminder Notice	10-SEP-2025	Region	-
32254	1009636	EIF	Federal Public Notification received from PWS	26-JUN-2025	Region	-
32245	1009635	EOX	Federal Compliance achieved	27-SEP-2024	Region	-
32242	1009632	EIF	Federal Public Notification received from PWS	18-JUL-2024	Region	-
32242	1009633	EIF	Federal Public Notification received from PWS	18-JUL-2024	Region	-
32230	1009597	EIF	Federal Public Notification received from PWS	26-OCT-2020	Region	-
32230	1009598	EIF	Federal Public Notification received from PWS	26-OCT-2020	Region	-
32226	1009570	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009596	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009595	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009594	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009593	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009592	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009591	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009590	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009589	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009588	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009587	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009586	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009585	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009584	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009564	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009565	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009566	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009567	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009568	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009569	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009571	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009572	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009573	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009574	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009575	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009576	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009577	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009578	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009579	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009580	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009581	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009582	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32226	1009583	EOX	Federal Compliance achieved	30-SEP-2020	Region	-
32225	1009563	EOX	Federal Compliance achieved	13-APR-2020	Region	-
32221	1009562	EOX	Federal Compliance achieved	07-NOV-2018	Region	-
32221	1009561	EOX	Federal Compliance achieved	07-NOV-2018	Region	-
32221	1009560	EOX	Federal Compliance achieved	07-NOV-2018	Region	-
32221	1009559	EOX	Federal Compliance achieved	07-NOV-2018	Region	-
32221	1009551	EOX	Federal Compliance achieved	07-NOV-2018	Region	-
32221	1009557	EOX	Federal Compliance achieved	07-NOV-2018	Region	-
32221	1009556	EOX	Federal Compliance achieved	07-NOV-2018	Region	-
32221	1009555	EOX	Federal Compliance achieved	07-NOV-2018	Region	-

1 - 50 of 132

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
LOWER SIOUX WL#1	1247	Yes	Well	Ground water	Permanent	Active
LOWER SIOUX WL#2	1248	Yes	Well	Ground water	Permanent	Active
DISTRIBUTION SYSTEM	775	No	Distribution System/Zone	-	-	Active
SAMPLING SITE #1	1748	No	Sampling Station	-	-	Active
SAMPLING SITE #2	1749	No	Sampling Station	-	-	Active
ENTRY POINT #1	773	No	Sampling Station	-	-	Active
TREATMENT PLANT #1	86	No	Treatment Plant	-	-	Active

1 - 7 of 7

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TREATMENT PLANT #1	86	Gaseous Chlorination, Post	Disinfection
TREATMENT PLANT #1	86	Flocculation	Softening (hardness removal)
TREATMENT PLANT #1	86	Inhibitor, Orthophosphate	Corrosion control
TREATMENT PLANT #1	86	Inhibitor, Polyphosphate	Corrosion control
TREATMENT PLANT #1	86	Gaseous Chlorination, Pre	Disinfection
TREATMENT PLANT #1	86	Filtration, Greensand	Iron removal

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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