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States → EPA Region 8 — Tribal Water Systems

Community Water System · PWS 083090047

Mnihnapa Water System

Harlem, EPA Region 8 — Tribal Water Systems 59526 - drinking water served from groundwater sources to 220 people, tracked in EPA SDWIS and UCMR5.

220
People served
203
EPA violations
29
Health-based
Untested
UCMR5 result

The verdict

EPA records 203 drinking-water violations at Mnihnapa Water System, 14% of them health-based.

203
Total EPA violations on record
14%
Health-based (MCL / treatment failure)
220
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mnihnapa Water System

Mnihnapa Water System is a native american-owned community water system that delivers drinking water to 220 residents in Harlem, EPA Region 8 — Tribal Water Systems through 51 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 203 total violations for this system , of which 29 (14%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 169 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 38 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

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
220
Total Violations
203
Health-Based Violations
29
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
51
School/Daycare
No
MCL Violations
21
Monitoring Violations
169
Treatment Tech Violations
8

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 38 2007
Coliform (TCR) MCL 18 2014
Groundwater Rule TT 5 2014
E. COLI MR 4 2020
Dalapon MR 3 2020
Diquat MR 3 2020
Endothall MR 3 2020
Carbofuran MR 3 2020
2,4-D MR 3 2020
2,4,5-TP MR 3 2020
Pentachlorophenol MR 3 2020
1,2-DIBROMO-3-CHLOROPROPANE MR 3 2020
OXAMYL MR 3 2020
Dinoseb MR 3 2020
ETHYLENE DIBROMIDE MR 3 2020
Picloram MR 3 2020
Glyphosate MR 3 2020
Gross Alpha, Excl. Radon and U MR 3 2021
Radium-226 MR 3 2021
Radium-228 MR 3 2021
Combined Radium (-226 and -228) MR 3 2021
Combined Uranium MR 3 2021
Revised Total Coliform Rule MCL 3 2020
Surface Water Treatment Rule TT 3 2016
Methoxychlor MR 2 2019
Toxaphene MR 2 2019
Di(2-ethylhexyl) phthalate MR 2 2019
Atrazine MR 2 2019
LASSO MR 2 2019
2,3,7,8-TCDD MR 2 2019

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 Mnihnapa 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 083090047 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
2021 Gross Alpha, Excl. Radon and U MR 3 SDWIS / 083090047 / 4000
2021 Radium-226 MR 3 SDWIS / 083090047 / 4020
2021 Radium-228 MR 3 SDWIS / 083090047 / 4030
2021 Combined Radium (-226 and -228) MR 3 SDWIS / 083090047 / 4010
2021 Combined Uranium MR 3 SDWIS / 083090047 / 4006
2020 E. COLI MR 4 SDWIS / 083090047 / 3014
2020 Dalapon MR 3 SDWIS / 083090047 / 2031
2020 Diquat MR 3 SDWIS / 083090047 / 2032
2020 Endothall MR 3 SDWIS / 083090047 / 2033
2020 Carbofuran MR 3 SDWIS / 083090047 / 2046
2020 2,4-D MR 3 SDWIS / 083090047 / 2105
2020 2,4,5-TP MR 3 SDWIS / 083090047 / 2110
2020 Pentachlorophenol MR 3 SDWIS / 083090047 / 2326
2020 1,2-DIBROMO-3-CHLOROPROPANE MR 3 SDWIS / 083090047 / 2931
2020 OXAMYL MR 3 SDWIS / 083090047 / 2036

How Mnihnapa Water System Compares

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

Metric Mnihnapa Water System EPA Region 8 — Tribal Water Systems avg Federal benchmark
Total violations 203 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 29 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 220 - 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 Mnihnapa Water System water safe to drink? ▼
Mnihnapa Water System (PWS ID: 083090047) has 203 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 220 people using Groundwater sources.
How many people does Mnihnapa Water System serve? ▼
Mnihnapa Water System serves 220 people in Harlem, EPA Region 8 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 51 service connections.
What type of violations does Mnihnapa Water System have? ▼
Mnihnapa Water System has 203 total violations: 29 health-based violations (MCL exceedances or treatment failures), 169 monitoring/reporting violations, and 8 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mnihnapa Water System water? ▼
No PFAS testing data is available for Mnihnapa Water System under the EPA's UCMR5 monitoring program.
What water source does Mnihnapa Water System use? ▼
Mnihnapa 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. 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.