Community Water System · PWS 055294207
Oak Point
Operator location Cass Lake, EPA Region 5 — Tribal Water Systems - 24% of 58 violations are health-based (upper-third health share (> 23%)); groundwater source; 45 served per SDWIS.
- 45
- People served (this PWS) Smaller third of systems
- 58
- EPA violations (this PWS) Middle third of systems
- 14
- Health-based (this PWS) Upper third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Oak Point standing, mid SDWIS violation third
24% of 58 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 24% is upper-third health share (> 23%).
The verdict
Oak Point lands in the middle third by violation volume (58), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (45; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 24% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 58
- Total EPA violations on record
- 24%
- Health-based (MCL / treatment failure)
- 45
- 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.
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
- 13
- School/Daycare
- No
- MCL Violations
- 14
- Monitoring Violations
- 37
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 14 | 2002 |
| Coliform (TCR) | MR | 7 | 2011 |
| Chlorine | MR | 4 | 2024 |
| Revised Total Coliform Rule | RPT | 4 | 2024 |
| Consumer Confidence Rule | Other | 2 | 2006 |
| CYANIDE | MR | 2 | 2022 |
| Gross Alpha, Excl. Radon and U | MR | 1 | 2008 |
| Combined Uranium | MR | 1 | 2008 |
| 1,2,4-Trichlorobenzene | MR | 1 | 2014 |
| DICHLOROMETHANE | MR | 1 | 2014 |
| o-Dichlorobenzene | MR | 1 | 2014 |
| p-Dichlorobenzene | MR | 1 | 2014 |
| Vinyl chloride | MR | 1 | 2014 |
| Trichloroethylene | MR | 1 | 2014 |
| Benzene | MR | 1 | 2014 |
| Toluene | MR | 1 | 2014 |
| Ethylbenzene | MR | 1 | 2014 |
| Styrene | MR | 1 | 2014 |
| CHLOROBENZENE | MR | 1 | 2014 |
| 1,2-Dichloroethane | MR | 1 | 2014 |
| Carbon tetrachloride | MR | 1 | 2014 |
| Xylenes, Total | MR | 1 | 2014 |
| Tetrachloroethylene | MR | 1 | 2014 |
| cis-1,2-Dichloroethylene | MR | 1 | 2014 |
| 1,1,1-Trichloroethane | MR | 1 | 2014 |
| Combined Radium (-226 and -228) | MR | 1 | 2008 |
| trans-1,2-Dichloroethylene | MR | 1 | 2014 |
| 1,1-Dichloroethylene | MR | 1 | 2014 |
| 1,2-Dichloropropane | MR | 1 | 2014 |
| 1,1,2-Trichloroethane | MR | 1 | 2014 |
Violation Count vs. the National Corpus
Oak Point has 58 recorded EPA violations, 60% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 39% carry more. 24% of this system's own violations are health-based (14 of 58), 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)
58 Around the middle fewer violations than 39% 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
Oak Point 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
Health-based violations on Oak Point
14 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for 055294207.
Sources: EPA SDWIS
Nationwide peers
58 violations · 45 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Oak Point
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.