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Non-Transient Non-Community Water System · PWS WI2680668

Big Bend Elementary School

Mukwonago, Wisconsin 53149 - drinking water served from groundwater sources to 507 people, tracked in EPA SDWIS and UCMR5.

507
People served
72
EPA violations
25
Health-based
Untested
UCMR5 result

The verdict

EPA records 72 drinking-water violations at Big Bend Elementary School, 35% of them health-based - above the Wisconsin per-system average.

72
Total EPA violations on record
35%
Health-based (MCL / treatment failure)
507
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Big Bend Elementary School

Big Bend Elementary School is a private-owned non-transient non-community water system that delivers drinking water to 507 residents in Mukwonago, Wisconsin (Waukesha County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 72 total violations for this system , of which 25 (35%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 47 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 26 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, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

Big Bend Elementary School's 72 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
507
Total Violations
72
Health-Based Violations
25
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
1
County
Waukesha
School/Daycare
Yes
MCL Violations
24
Monitoring Violations
47
Treatment Tech Violations
1

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 26 2002
Coliform (TCR) MCL 24 2010
Total Haloacetic Acids (HAA5) MR 9 2021
TTHM MR 9 2021
Lead and Copper Rule MR 3 1994
Lead and Copper Rule TT 1 1994

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 Big Bend Elementary 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 WI2680668 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 Big Bend Elementary 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
2021 Total Haloacetic Acids (HAA5) MR 9 SDWIS / WI2680668 / 2456
2021 TTHM MR 9 SDWIS / WI2680668 / 2950
2010 Coliform (TCR) MCL 24 SDWIS / WI2680668 / 3100
2002 Coliform (TCR) MR 26 SDWIS / WI2680668 / 3100
1994 Lead and Copper Rule MR 3 SDWIS / WI2680668 / 5000
1994 Lead and Copper Rule TT 1 SDWIS / WI2680668 / 5000

How Big Bend Elementary School Compares

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

Metric Big Bend Elementary School Wisconsin avg Federal benchmark
Total violations 72 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 25 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 507 467 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 Big Bend Elementary School water safe to drink? ▼
Big Bend Elementary School (PWS ID: WI2680668) has 72 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 507 people using Groundwater sources.
How many people does Big Bend Elementary School serve? ▼
Big Bend Elementary School serves 507 people in Mukwonago, Wisconsin. It is a Private-owned system using Groundwater water sources with 1 service connections.
What type of violations does Big Bend Elementary School have? ▼
Big Bend Elementary School has 72 total violations: 25 health-based violations (MCL exceedances or treatment failures), 47 monitoring/reporting violations, and 1 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Big Bend Elementary School water? ▼
No PFAS testing data is available for Big Bend Elementary School under the EPA's UCMR5 monitoring program.
What water source does Big Bend Elementary School use? ▼
Big Bend Elementary 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.