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States → EPA Region 8 — Tribal Water Systems

Community Water System · PWS 084690516

Sicangu Mni Wiconi Rural Water System

Rosebud, EPA Region 8 — Tribal Water Systems 57570 - drinking water served from surface water sources to 5,610 people, tracked in EPA SDWIS and UCMR5.

5,610
People served
43
EPA violations
16
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 43 drinking-water violations at Sicangu Mni Wiconi Rural Water System, 37% of them health-based.

43
Total EPA violations on record
37%
Health-based (MCL / treatment failure)
5,610
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Sicangu Mni Wiconi Rural Water System

Sicangu Mni Wiconi Rural Water System is a native american-owned community water system that delivers drinking water to 5,610 residents in Rosebud, EPA Region 8 — Tribal Water Systems through 888 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 43 total violations for this system , of which 16 (37%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 24 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 15 violations (MCL, health-based). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

EPA Region 8 — Tribal Water Systems has thousands of regulated public water systems tracked by EPA under the Safe Drinking Water Act.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
5,610
Total Violations
43
Health-Based Violations
16
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Native American
Connections
888
School/Daycare
No
MCL Violations
15
Monitoring Violations
24
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 15 2015
Coliform (TCR) MR 5 2015
TTHM MR 4 2014
Total Haloacetic Acids (HAA5) MR 4 2014
Revised Total Coliform Rule RPT 2 2023
Lead and Copper Rule MR 1 2023
Arsenic MR 1 1983
Mercury MR 1 1983
Nitrate MR 1 1983
LEAD AND COPPER RULE REVISIONS TT 1 2024
Gross Alpha, Excl. Radon and U MR 1 1982
LEAD AND COPPER RULE REVISIONS RPT 1 2024
Cadmium MR 1 1983
Revised Total Coliform Rule MON 1 2017
Barium MR 1 1983
Chromium MR 1 1983
Selenium MR 1 1983
Fluoride MR 1 1983

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 116 samples detected PFAS.

Contaminant Date Result MRL Status
PFBA 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 9/27/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
PFUnA 9/27/2023 <2.00 ppt 2.00 ppt Not Detected
PFHxA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
PFOA 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxS 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/27/2023 <20.00 ppt 20.00 ppt Not Detected
PFTA 9/27/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 9/27/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 9/27/2023 <6.00 ppt 6.00 ppt Not Detected
PFHpS 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
6:2 FTS 9/27/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
4:2 FTS 9/27/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/27/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxA 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
4:2 FTS 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 6/28/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 6/28/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
HFPO-DA 6/28/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/28/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 6/28/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 6/28/2023 <2.00 ppt 2.00 ppt Not Detected
8:2 FTS 6/28/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 6/28/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 6/28/2023 <20.00 ppt 20.00 ppt Not Detected
PFHpS 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/28/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 6/28/2023 <4.00 ppt 4.00 ppt Not Detected

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Sicangu Mni Wiconi Rural Water System.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID 084690516 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 8 — Tribal Water Systems Drinking Water Authority

EPA Region 8 — Tribal Water Systems's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find 08 regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / 084690516 / 5200
2024 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / 084690516 / 5200
2023 Revised Total Coliform Rule RPT 2 SDWIS / 084690516 / 8000
2023 Lead and Copper Rule MR 1 SDWIS / 084690516 / 5000
2017 Revised Total Coliform Rule MON 1 SDWIS / 084690516 / 8000
2015 Coliform (TCR) MCL 15 SDWIS / 084690516 / 3100
2015 Coliform (TCR) MR 5 SDWIS / 084690516 / 3100
2014 TTHM MR 4 SDWIS / 084690516 / 2950
2014 Total Haloacetic Acids (HAA5) MR 4 SDWIS / 084690516 / 2456
1983 Arsenic MR 1 SDWIS / 084690516 / 1005
1983 Mercury MR 1 SDWIS / 084690516 / 1035
1983 Nitrate MR 1 SDWIS / 084690516 / 1040
1983 Cadmium MR 1 SDWIS / 084690516 / 1015
1983 Barium MR 1 SDWIS / 084690516 / 1010
1983 Chromium MR 1 SDWIS / 084690516 / 1020

How Sicangu Mni Wiconi Rural Water System Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Sicangu Mni Wiconi Rural Water System EPA Region 8 — Tribal Water Systems avg Federal benchmark
Total violations 43 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 16 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 5,610 - Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across all regulated public water systems in EPA Region 8 — Tribal Water Systems.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Sicangu Mni Wiconi Rural Water System water safe to drink? ▼
Sicangu Mni Wiconi Rural Water System (PWS ID: 084690516) has 43 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 5,610 people using Surface Water sources.
How many people does Sicangu Mni Wiconi Rural Water System serve? ▼
Sicangu Mni Wiconi Rural Water System serves 5,610 people in Rosebud, EPA Region 8 — Tribal Water Systems. It is a Native American-owned system using Surface Water water sources with 888 service connections.
What type of violations does Sicangu Mni Wiconi Rural Water System have? ▼
Sicangu Mni Wiconi Rural Water System has 43 total violations: 16 health-based violations (MCL exceedances or treatment failures), 24 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Sicangu Mni Wiconi Rural Water System water? ▼
No. Sicangu Mni Wiconi Rural Water System was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Sicangu Mni Wiconi Rural Water System use? ▼
Sicangu Mni Wiconi Rural Water System uses Surface Water as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.