WI DNR MILL BLUFF BEACH
PWS ID: WI6420335 · Ontario, Wisconsin 54651
WI DNR MILL BLUFF BEACH serves 125 people in Ontario, Wisconsin using Groundwater water sources. It has 51 recorded EPA violations, including 20 health-based violations. No PFAS contamination was detected in UCMR5 testing.
Water Quality Snapshot: WI DNR MILL BLUFF BEACH
WI DNR MILL BLUFF BEACH is a state-owned transient non-community water system that delivers drinking water to 125 residents in Ontario, Wisconsin (Monroe County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 51 total violations for this system , of which 20 (39%) are health-based — meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 25 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 Coliform (TCR), recorded in 20 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.
Across Wisconsin, EPA tracks 10,988 public water systems serving 5,131,439 people, with 285,161 cumulative violations and 58,688 health-based violations on record. About 72% of systems in the state carry at least one violation, and state-wide the average per system is 26 violations. WI DNR MILL BLUFF BEACH's 51 violations sit above the Wisconsin average. Statewide, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%). All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.
System Details
- System Type
- Transient Non-Community
- Owner Type
- State
- Connections
- 1
- County
- Monroe
- School/Daycare
- No
- MCL Violations
- 20
- Monitoring Violations
- 25
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 20 | 2012 |
| Coliform (TCR) | MR | 10 | 2009 |
| Revised Total Coliform Rule | MON | 8 | 2019 |
| Nitrate | MR | 7 | 2005 |
| Revised Total Coliform Rule | RPT | 4 | 2023 |
| Public Notice | Other | 2 | 2012 |
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 WI DNR MILL BLUFF BEACH.
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 WI6420335 on SDWISSource: EPA SDWIS Federal Reports Search
Wisconsin Drinking Water Authority
Wisconsin DNR — Drinking Water and Groundwater is the primacy agency that licenses and inspects WI DNR MILL BLUFF BEACH under EPA-delegated authority.
Open WI regulator portalViolation 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 | 4 | SDWIS / WI6420335 / 8000 |
| 2019 | Revised Total Coliform Rule | MON | 8 | SDWIS / WI6420335 / 8000 |
| 2012 | Coliform (TCR) | MCL | 20 | SDWIS / WI6420335 / 3100 |
| 2012 | Public Notice | Other | 2 | SDWIS / WI6420335 / 7500 |
| 2009 | Coliform (TCR) | MR | 10 | SDWIS / WI6420335 / 3100 |
| 2005 | Nitrate | MR | 7 | SDWIS / WI6420335 / 1040 |
How WI DNR MILL BLUFF BEACH Compares
Cross-reference this system's record against state averages and the federal MCL framework for context.
| Metric | WI DNR MILL BLUFF BEACH | Wisconsin avg | Federal benchmark |
|---|---|---|---|
| Total violations | 51 | 26 | SDWA compliance — any non-zero count is a recorded breach |
| Health-based violations | 20 | 5.3 | Indicates a contaminant exceeded a federal MCL |
| PFAS detection | None | 38.6% | EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt |
| Population served | 125 | 467 | Sizing context for compliance burden |
Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 10,988 regulated public water systems in Wisconsin.
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 WI DNR MILL BLUFF BEACH water safe to drink? ▼
How many people does WI DNR MILL BLUFF BEACH serve? ▼
What type of violations does WI DNR MILL BLUFF BEACH have? ▼
Has PFAS been detected in WI DNR MILL BLUFF BEACH water? ▼
What water source does WI DNR MILL BLUFF BEACH use? ▼
Where does this data come from? ▼
Explore PlainWater
Related Data for Wisconsin
Read our methodology — how this data is sourced, computed, and verified.