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Transient Non-Community Water System · PWS WI2460441

WI DNR Harrington Beach Quarry Lake

Madison, Wisconsin 53707-7921 - drinking water served from groundwater sources to 75 people, tracked in EPA SDWIS and UCMR5.

75
People served
94
EPA violations
30
Health-based
Untested
UCMR5 result

The verdict

EPA records 94 drinking-water violations at WI DNR Harrington Beach Quarry Lake, 32% of them health-based - above the Wisconsin per-system average.

94
Total EPA violations on record
32%
Health-based (MCL / treatment failure)
75
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: WI DNR Harrington Beach Quarry Lake

WI DNR Harrington Beach Quarry Lake is a state-owned transient non-community water system that delivers drinking water to 75 residents in Madison, Wisconsin (Ozaukee County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 94 total violations for this system , of which 30 (32%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 59 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 30 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. Statewide, 51 of 202 UCMR5-tested systems have reported PFAS detections (25.2%).

WI DNR Harrington Beach Quarry Lake's 94 violations sit above the Wisconsin average.

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
75
Total Violations
94
Health-Based Violations
30
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
State
Connections
1
County
Ozaukee
School/Daycare
No
MCL Violations
30
Monitoring Violations
59
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 30 2014
Revised Total Coliform Rule MON 24 2023
Nitrate MR 17 2023
Coliform (TCR) MR 15 2004
E. COLI MR 3 2021
Public Notice Other 2 2004

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 Harrington Beach Quarry Lake.

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 WI2460441 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Wisconsin Drinking Water Authority

Wisconsin DNR, Drinking Water and Groundwater is the primacy agency that licenses and inspects WI DNR Harrington Beach Quarry Lake under EPA-delegated authority.

Open WI regulator portal

Source: Wisconsin DNR, Drinking Water and Groundwater

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 MON 24 SDWIS / WI2460441 / 8000
2023 Nitrate MR 17 SDWIS / WI2460441 / 1040
2021 E. COLI MR 3 SDWIS / WI2460441 / 3014
2014 Coliform (TCR) MCL 30 SDWIS / WI2460441 / 3100
2004 Coliform (TCR) MR 15 SDWIS / WI2460441 / 3100
2004 Public Notice Other 2 SDWIS / WI2460441 / 7500

How WI DNR Harrington Beach Quarry Lake Compares

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

Metric WI DNR Harrington Beach Quarry Lake Wisconsin avg Federal benchmark
Total violations 94 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 30 5.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 25.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 75 467 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 (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 WI DNR Harrington Beach Quarry Lake water safe to drink? ▼
WI DNR Harrington Beach Quarry Lake (PWS ID: WI2460441) has 94 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 75 people using Groundwater sources.
How many people does WI DNR Harrington Beach Quarry Lake serve? ▼
WI DNR Harrington Beach Quarry Lake serves 75 people in Madison, Wisconsin. It is a State-owned system using Groundwater water sources with 1 service connections.
What type of violations does WI DNR Harrington Beach Quarry Lake have? ▼
WI DNR Harrington Beach Quarry Lake has 94 total violations: 30 health-based violations (MCL exceedances or treatment failures), 59 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in WI DNR Harrington Beach Quarry Lake water? ▼
No PFAS testing data is available for WI DNR Harrington Beach Quarry Lake under the EPA's UCMR5 monitoring program.
What water source does WI DNR Harrington Beach Quarry Lake use? ▼
WI DNR Harrington Beach Quarry Lake uses Groundwater as its primary water source. It is classified as a Transient Non-Community Water System, serving transient populations.
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.