Community Water System · PWS 055294101
Grand Portage
Operator location Grand Portage, EPA Region 5 — Tribal Water Systems - smaller served population (≤ 999) at 820 people served; 1,966 SDWIS violations on record from surface water sources.
- 820
- People served (this PWS) Smaller third of systems
- 1,966
- EPA violations (this PWS) Upper third of systems
- 78
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Grand Portage standing, high SDWIS violation third
820 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 4% is middle-third health share (≤ 23%). Population rank #22,137 of 29,740 among systems serving 500+.
The verdict
Grand Portage sits in the upper third of the sitemap cohort by violation count (1,966), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (820; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 4% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #22,137 of 29,740
- Population · /systems
- #38 of 46
- Population · 05
- 1,966
- Total EPA violations on record
- 4%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 139
- School/Daycare
- No
- MCL Violations
- 11
- Monitoring Violations
- 1,743
- Treatment Tech Violations
- 67
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | MR | 97 | 2023 |
| Public Notice | Other | 89 | 2025 |
| Surface Water Treatment Rule | MR | 55 | 2022 |
| Interim Enhanced Surface Water Treatment Rule | TT | 41 | 2022 |
| Lead and Copper Rule | MR | 35 | 2024 |
| Revised Total Coliform Rule | MON | 29 | 2021 |
| Chlorine | MR | 27 | 2021 |
| Asbestos | MR | 26 | 2023 |
| Arsenic | MR | 25 | 2023 |
| Beryllium, Total | MR | 25 | 2023 |
| Nickel | MR | 25 | 2023 |
| Selenium | MR | 25 | 2023 |
| 2,3,7,8-TCDD | MR | 23 | 2023 |
| Revised Total Coliform Rule | RPT | 23 | 2023 |
| cis-1,2-Dichloroethylene | MR | 22 | 2023 |
| Xylenes, Total | MR | 22 | 2023 |
| Trichloroethylene | MR | 22 | 2023 |
| 1,1,2-Trichloroethane | MR | 22 | 2023 |
| Tetrachloroethylene | MR | 22 | 2023 |
| CHLOROBENZENE | MR | 22 | 2023 |
| Toluene | MR | 22 | 2023 |
| Ethylbenzene | MR | 22 | 2023 |
| Styrene | MR | 22 | 2023 |
| Barium | MR | 22 | 2023 |
| Cadmium | MR | 22 | 2023 |
| Chromium | MR | 22 | 2023 |
| Fluoride | MR | 22 | 2023 |
| Thallium, Total | MR | 22 | 2023 |
| CYANIDE | MR | 22 | 2023 |
| 1,2,4-Trichlorobenzene | MR | 22 | 2023 |
Violation Count vs. the National Corpus
Grand Portage has 1,966 recorded EPA violations, 100% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 0% carry more. 4% of this system's own violations are health-based (78 of 1,966), and it ranks #22,137 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
1,966 Higher than most more violations than 99%+ 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
How many violations vs. how serious, among peer systems
Grand Portage plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Population served record for Grand Portage
EPA SDWIS lists 820 people served and 139 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
1,966 violations · 820 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.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Grand Portage
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 5 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 5 — 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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.