PlainWater
States → 05

LAC DU FLAMBEAU

PWS ID: 055295401 · LAC DU FLAMBEAU, 05 54538

LAC DU FLAMBEAU serves 3,168 people in LAC DU FLAMBEAU, 05 using Groundwater water sources. It has 17 recorded EPA violations, including 2 health-based violations. PFAS "forever chemicals" were detected in UCMR5 testing (1 compound found).

Water Quality Snapshot: LAC DU FLAMBEAU

LAC DU FLAMBEAU is a native american-owned community water system that delivers drinking water to 3,168 residents in LAC DU FLAMBEAU, 05 through 641 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 17 total violations for this system , of which 2 (12%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 12 monitoring and reporting violations are on file. The most recent violation on record dates to 2023.

The most frequently cited contaminant at this system is Thallium, Total, recorded in 4 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 0.0082 ppt. PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

Across 05, EPA tracks 113 public water systems serving 144,290 people, with 19,546 cumulative violations and 443 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 173 violations. LAC DU FLAMBEAU's 17 violations sit below the 05 average. Statewide, 5 of 13 UCMR5-tested systems have reported PFAS detections (38.5%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

PFAS Detected

1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
3,168
Total Violations
17
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Native American
Connections
641
School/Daycare
No
MCL Violations
2
Monitoring Violations
12
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Thallium, Total MR 4 2017
Coliform (TCR) MR 3 1999
Revised Total Coliform Rule RPT 3 2023
Coliform (TCR) MCL 2 2012
Fluoride MR 2 2011
Gross Alpha, Excl. Radon and U MR 1 2008
Combined Radium (-226 and -228) MR 1 2008
Combined Uranium MR 1 2008

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 60 samples detected PFAS.

Contaminant Date Result MRL Status
PFTrDA 6/11/2025 <0.007 µg/L 0.007 µg/L Not Detected
PFMPA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 6/11/2025 0.0082 µg/L 0.003 µg/L Detected
PFHpS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFPeS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
NFDHA 6/11/2025 <0.02 µg/L 0.02 µg/L Not Detected
PFEESA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
lithium 6/11/2025 <9 µg/L 9 µg/L Not Detected
PFMBA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NEtFOSAA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFTA 6/11/2025 <0.008 µg/L 0.008 µg/L Not Detected
PFHpA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 6/11/2025 <0.006 µg/L 0.006 µg/L Not Detected
11Cl-PF3OUdS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFPeA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
6:2 FTS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 6/11/2025 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 6/11/2025 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 6/11/2025 <0.006 µg/L 0.006 µg/L Not Detected
PFEESA 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 6/11/2025 <0.003 µg/L 0.003 µg/L Not Detected
PFTA 6/11/2025 <0.008 µg/L 0.008 µg/L Not Detected
lithium 6/11/2025 <9 µg/L 9 µg/L Not Detected
PFTrDA 6/11/2025 <0.007 µg/L 0.007 µg/L Not Detected
NEtFOSAA 6/11/2025 <0.005 µg/L 0.005 µg/L Not Detected

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 LAC DU FLAMBEAU.

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 055295401 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

05 Drinking Water Authority

05'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
2023 Revised Total Coliform Rule RPT 3 SDWIS / 055295401 / 8000
2017 Thallium, Total MR 4 SDWIS / 055295401 / 1085
2012 Coliform (TCR) MCL 2 SDWIS / 055295401 / 3100
2011 Fluoride MR 2 SDWIS / 055295401 / 1025
2008 Gross Alpha, Excl. Radon and U MR 1 SDWIS / 055295401 / 4000
2008 Combined Radium (-226 and -228) MR 1 SDWIS / 055295401 / 4010
2008 Combined Uranium MR 1 SDWIS / 055295401 / 4006
1999 Coliform (TCR) MR 3 SDWIS / 055295401 / 3100

How LAC DU FLAMBEAU Compares

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

Metric LAC DU FLAMBEAU 05 avg Federal benchmark
Total violations 17 173 SDWA compliance — any non-zero count is a recorded breach
Health-based violations 2 3.9 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 38.5% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 3,168 1,277 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 113 regulated public water systems in 05.

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
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is LAC DU FLAMBEAU water safe to drink? ▼
LAC DU FLAMBEAU (PWS ID: 055295401) has 17 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 3,168 people using Groundwater sources.
How many people does LAC DU FLAMBEAU serve? ▼
LAC DU FLAMBEAU serves 3,168 people in LAC DU FLAMBEAU, 05. It is a Native American-owned system using Groundwater water sources with 641 service connections.
What type of violations does LAC DU FLAMBEAU have? ▼
LAC DU FLAMBEAU has 17 total violations: 2 health-based violations (MCL exceedances or treatment failures), 12 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in LAC DU FLAMBEAU water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in LAC DU FLAMBEAU's water supply: PFBS. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does LAC DU FLAMBEAU use? ▼
LAC DU FLAMBEAU 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.

Explore PlainWater

Water in 05

All systems in state
All States

Water quality by state
Contaminants

PFAS & other pollutants
Guides

Understanding water quality

Related Data for 05

Environmental Data → Natural Hazards → Air Quality → Healthcare Access → Climate Data →
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.

Read our methodology — how this data is sourced, computed, and verified.

Related

Browse all → | Rankings →
Data sourced from $official public datasets. See our methodology for details. Retrieved and formatted by PlainWater Editorial