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Non-Transient Non-Community Water System · PWS WI2680593

St Anthony on the Lake School

Pewaukee, Wisconsin 53072 - drinking water served from groundwater sources to 276 people, tracked in EPA SDWIS and UCMR5.

276
People served
359
EPA violations
6
Health-based
Untested
UCMR5 result

The verdict

EPA records 359 drinking-water violations at St Anthony on the Lake School, 2% of them health-based - above the Wisconsin per-system average.

359
Total EPA violations on record
2%
Health-based (MCL / treatment failure)
276
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: St Anthony on the Lake School

St Anthony on the Lake School is a private-owned non-transient non-community water system that delivers drinking water to 276 residents in Pewaukee, Wisconsin (Waukesha County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 359 total violations for this system , of which 6 (2%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 350 monitoring and reporting violations are on file. The most recent violation on record dates to 2011.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 22 violations (MR). 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%).

St Anthony on the Lake School's 359 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
276
Total Violations
359
Health-Based Violations
6
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
1
County
Waukesha
School/Daycare
Yes
MCL Violations
6
Monitoring Violations
350
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 22 2006
Nitrate MR 16 2011
Barium MR 9 2000
Chromium MR 9 2000
Mercury MR 9 2000
Beryllium, Total MR 9 2000
Thallium, Total MR 9 2000
Antimony, Total MR 9 2000
Nitrate-Nitrite MR 9 2000
Nickel MR 9 2000
Fluoride MR 9 2000
Nitrite MR 9 2000
1,2,4-Trichlorobenzene MR 9 2000
cis-1,2-Dichloroethylene MR 9 2000
o-Dichlorobenzene MR 9 2000
1,1-Dichloroethylene MR 9 2000
trans-1,2-Dichloroethylene MR 9 2000
1,2-Dichloroethane MR 9 2000
Carbon tetrachloride MR 9 2000
1,2-Dichloropropane MR 9 2000
Tetrachloroethylene MR 9 2000
CHLOROBENZENE MR 9 2000
Ethylbenzene MR 9 2000
Styrene MR 9 2000
Arsenic MR 9 2000
Xylenes, Total MR 9 2000
DICHLOROMETHANE MR 9 2000
Vinyl chloride MR 9 2000
1,1,1-Trichloroethane MR 9 2000
Trichloroethylene MR 9 2000

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 St Anthony on the Lake School.

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 WI2680593 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 St Anthony on the Lake School 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
2011 Nitrate MR 16 SDWIS / WI2680593 / 1040
2011 Coliform (TCR) MCL 6 SDWIS / WI2680593 / 3100
2011 Lead and Copper Rule MR 6 SDWIS / WI2680593 / 5000
2011 Public Notice Other 3 SDWIS / WI2680593 / 7500
2006 Coliform (TCR) MR 22 SDWIS / WI2680593 / 3100
2000 Barium MR 9 SDWIS / WI2680593 / 1010
2000 Chromium MR 9 SDWIS / WI2680593 / 1020
2000 Mercury MR 9 SDWIS / WI2680593 / 1035
2000 Beryllium, Total MR 9 SDWIS / WI2680593 / 1075
2000 Thallium, Total MR 9 SDWIS / WI2680593 / 1085
2000 Antimony, Total MR 9 SDWIS / WI2680593 / 1074
2000 Nitrate-Nitrite MR 9 SDWIS / WI2680593 / 1038
2000 Nickel MR 9 SDWIS / WI2680593 / 1036
2000 Fluoride MR 9 SDWIS / WI2680593 / 1025
2000 Nitrite MR 9 SDWIS / WI2680593 / 1041

How St Anthony on the Lake School Compares

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

Metric St Anthony on the Lake School Wisconsin avg Federal benchmark
Total violations 359 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 6 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 276 467 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 St Anthony on the Lake School water safe to drink? ▼
St Anthony on the Lake School (PWS ID: WI2680593) has 359 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 276 people using Groundwater sources.
How many people does St Anthony on the Lake School serve? ▼
St Anthony on the Lake School serves 276 people in Pewaukee, Wisconsin. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does St Anthony on the Lake School have? ▼
St Anthony on the Lake School has 359 total violations: 6 health-based violations (MCL exceedances or treatment failures), 350 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in St Anthony on the Lake School water? ▼
No PFAS testing data is available for St Anthony on the Lake School under the EPA's UCMR5 monitoring program.
What water source does St Anthony on the Lake School use? ▼
St Anthony on the Lake School uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.