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States → EPA Region 5 — Tribal Water Systems

Community Water System · PWS 055294207

Oak Point

Cass Lake, EPA Region 5 — Tribal Water Systems 56633 - drinking water served from groundwater sources to 45 people, tracked in EPA SDWIS and UCMR5.

45
People served
58
EPA violations
14
Health-based
Untested
UCMR5 result

The verdict

EPA records 58 drinking-water violations at Oak Point, 24% of them health-based.

58
Total EPA violations on record
24%
Health-based (MCL / treatment failure)
45
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Oak Point

Oak Point is a native american-owned community water system that delivers drinking water to 45 residents in Cass Lake, EPA Region 5 — Tribal Water Systems through 13 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 58 total violations for this system , of which 14 (24%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 37 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 14 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

EPA Region 5 — 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
45
Total Violations
58
Health-Based Violations
14
Water Source
Groundwater

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

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 Oak Point.

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 055294207 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

EPA Region 5 — Tribal Water Systems Drinking Water Authority

EPA Region 5 — 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 05 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 Chlorine MR 4 SDWIS / 055294207 / 0999
2024 Revised Total Coliform Rule RPT 4 SDWIS / 055294207 / 8000
2022 CYANIDE MR 2 SDWIS / 055294207 / 1024
2014 1,2,4-Trichlorobenzene MR 1 SDWIS / 055294207 / 2378
2014 DICHLOROMETHANE MR 1 SDWIS / 055294207 / 2964
2014 o-Dichlorobenzene MR 1 SDWIS / 055294207 / 2968
2014 p-Dichlorobenzene MR 1 SDWIS / 055294207 / 2969
2014 Vinyl chloride MR 1 SDWIS / 055294207 / 2976
2014 Trichloroethylene MR 1 SDWIS / 055294207 / 2984
2014 Benzene MR 1 SDWIS / 055294207 / 2990
2014 Toluene MR 1 SDWIS / 055294207 / 2991
2014 Ethylbenzene MR 1 SDWIS / 055294207 / 2992
2014 Styrene MR 1 SDWIS / 055294207 / 2996
2014 CHLOROBENZENE MR 1 SDWIS / 055294207 / 2989
2014 1,2-Dichloroethane MR 1 SDWIS / 055294207 / 2980

How Oak Point Compares

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

Metric Oak Point EPA Region 5 — Tribal Water Systems avg Federal benchmark
Total violations 58 - SDWA compliance, any non-zero count is a recorded breach
Health-based violations 14 - Indicates a contaminant exceeded a federal MCL
PFAS detection None - EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 45 - 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 5 — 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 Oak Point water safe to drink? ▼
Oak Point (PWS ID: 055294207) has 58 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 45 people using Groundwater sources.
How many people does Oak Point serve? ▼
Oak Point serves 45 people in Cass Lake, EPA Region 5 — Tribal Water Systems. It is a Native American-owned system using Groundwater water sources with 13 service connections.
What type of violations does Oak Point have? ▼
Oak Point has 58 total violations: 14 health-based violations (MCL exceedances or treatment failures), 37 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Oak Point water? ▼
No PFAS testing data is available for Oak Point under the EPA's UCMR5 monitoring program.
What water source does Oak Point use? ▼
Oak Point 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.