Community Water System · PWS 083090047
Mnihnapa Water System
Operator location Harlem, EPA Region 8 — Tribal Water Systems - smaller served population (≤ 999) at 220 people served; 203 SDWIS violations on record from groundwater sources.
- 220
- People served (this PWS)
- 203
- EPA violations (this PWS)
- 29
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Mnihnapa Water System standing, high SDWIS violation third
220 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 14% is middle-third health share (≤ 23%).
The verdict
Mnihnapa Water System sits in the upper third of the sitemap cohort by violation count (203), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (220; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 14% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 203
- Total EPA violations on record
- 14%
- Health-based (MCL / treatment failure)
- 220
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
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 |
Violation Count vs. the National Corpus
Mnihnapa Water System has 203 recorded EPA violations, 86% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 14% carry more. 14% of this system's own violations are health-based (29 of 203), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
203 Higher than most more violations than 86% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Population served record for Mnihnapa Water System
EPA SDWIS lists 220 people served and 51 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
203 violations · 220 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Mnihnapa Water System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 8 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 8 — Tribal Water Systems systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.