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States → EPA Region 8 — Tribal Water Systems

Community Water System · PWS 084690528

Rosebud Rural Water System

Rosebud, EPA Region 8 — Tribal Water Systems 57570 - drinking water served from groundwater sources to 5,500 people, tracked in EPA SDWIS and UCMR5.

5,500
People served
132
EPA violations
3
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 132 drinking-water violations at Rosebud Rural Water System, 2% of them health-based.

132
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
5,500
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Rosebud Rural Water System

Rosebud Rural Water System is a native american-owned community water system that delivers drinking water to 5,500 residents in Rosebud, EPA Region 8 — Tribal Water Systems through 1,686 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 132 total violations for this system , of which 3 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 126 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 6 violations (MR). 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
5,500
Total Violations
132
Health-Based Violations
3
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
1,686
School/Daycare
No
MCL Violations
1
Monitoring Violations
126
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 6 2013
BHC-GAMMA MR 3 2020
CYANIDE MR 3 2020
Benzene MR 2 2020
Carbon tetrachloride MR 2 2020
1,2-Dichloroethane MR 2 2020
p-Dichlorobenzene MR 2 2020
1,2-Dichloropropane MR 2 2020
Ethylbenzene MR 2 2020
CHLOROBENZENE MR 2 2020
o-Dichlorobenzene MR 2 2020
Xylenes, Total MR 2 2020
DICHLOROMETHANE MR 2 2020
Chlorine MR 2 2012
Fluoride MR 2 2020
ETHYLENE DIBROMIDE MR 2 2020
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2020
Dinoseb MR 2 2020
Simazine MR 2 2020
Toxaphene MR 2 2020
Heptachlor epoxide MR 2 2020
Pentachlorophenol MR 2 2020
Atrazine MR 2 2020
Picloram MR 2 2020
Di(2-ethylhexyl) adipate MR 2 2020
Glyphosate MR 2 2020
OXAMYL MR 2 2020
HEXACHLOROBENZENE MR 2 2020
Di(2-ethylhexyl) phthalate MR 2 2020
Heptachlor MR 2 2020

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 29 samples detected PFAS.

Contaminant Date Result MRL Status
HFPO-DA 6/4/2025 <5.00 ppt 5.00 ppt Not Detected
PFHxS 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 6/4/2025 <7.00 ppt 7.00 ppt Not Detected
PFTA 6/4/2025 <8.00 ppt 8.00 ppt Not Detected
PFHpS 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeS 6/4/2025 <4.00 ppt 4.00 ppt Not Detected
NFDHA 6/4/2025 <20.00 ppt 20.00 ppt Not Detected
PFEESA 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFMBA 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFPeA 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFMPA 6/4/2025 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 6/4/2025 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 6/4/2025 <5.00 ppt 5.00 ppt Not Detected
PFBA 6/4/2025 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 6/4/2025 <6.00 ppt 6.00 ppt Not Detected
11Cl-PF3OUdS 6/4/2025 <5.00 ppt 5.00 ppt Not Detected
PFUnA 6/4/2025 <2.00 ppt 2.00 ppt Not Detected
PFHxA 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFDoA 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFDA 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFOA 6/4/2025 <4.00 ppt 4.00 ppt Not Detected
PFOS 6/4/2025 <4.00 ppt 4.00 ppt Not Detected
ADONA 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 6/4/2025 <2.00 ppt 2.00 ppt Not Detected
PFNA 6/4/2025 <4.00 ppt 4.00 ppt Not Detected
PFHpA 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
PFBS 6/4/2025 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 6/4/2025 <5.00 ppt 5.00 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 Rosebud 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 084690528 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 RPT 1 SDWIS / 084690528 / 5200
2024 LEAD AND COPPER RULE REVISIONS TT 1 SDWIS / 084690528 / 5200
2023 Revised Total Coliform Rule RPT 2 SDWIS / 084690528 / 8000
2021 Groundwater Rule TT 1 SDWIS / 084690528 / 0700
2020 BHC-GAMMA MR 3 SDWIS / 084690528 / 2010
2020 CYANIDE MR 3 SDWIS / 084690528 / 1024
2020 Benzene MR 2 SDWIS / 084690528 / 2990
2020 Carbon tetrachloride MR 2 SDWIS / 084690528 / 2982
2020 1,2-Dichloroethane MR 2 SDWIS / 084690528 / 2980
2020 p-Dichlorobenzene MR 2 SDWIS / 084690528 / 2969
2020 1,2-Dichloropropane MR 2 SDWIS / 084690528 / 2983
2020 Ethylbenzene MR 2 SDWIS / 084690528 / 2992
2020 CHLOROBENZENE MR 2 SDWIS / 084690528 / 2989
2020 o-Dichlorobenzene MR 2 SDWIS / 084690528 / 2968
2020 Xylenes, Total MR 2 SDWIS / 084690528 / 2955

How Rosebud Rural Water System Compares

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

Metric Rosebud Rural Water System EPA Region 8 — Tribal Water Systems avg Federal benchmark
Total violations 132 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 3 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 5,500 - 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 Rosebud Rural Water System water safe to drink? ▼
Rosebud Rural Water System (PWS ID: 084690528) has 132 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 5,500 people using Groundwater sources.
How many people does Rosebud Rural Water System serve? ▼
Rosebud Rural Water System serves 5,500 people in Rosebud, EPA Region 8 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 1,686 service connections.
What type of violations does Rosebud Rural Water System have? ▼
Rosebud Rural Water System has 132 total violations: 3 health-based violations (MCL exceedances or treatment failures), 126 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Rosebud Rural Water System water? ▼
No. Rosebud Rural Water System was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Rosebud Rural Water System use? ▼
Rosebud Rural Water System uses Groundwater 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.