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Community Water System · PWS WI2680203

Marian Heights Subdivision

Elm Grove, Wisconsin 53122 - drinking water served from groundwater sources to 400 people, tracked in EPA SDWIS and UCMR5.

400
People served
277
EPA violations
44
Health-based
Untested
UCMR5 result

The verdict

EPA records 277 drinking-water violations at Marian Heights Subdivision, 16% of them health-based - above the Wisconsin per-system average.

277
Total EPA violations on record
16%
Health-based (MCL / treatment failure)
400
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Marian Heights Subdivision

Marian Heights Subdivision is a private-owned community water system that delivers drinking water to 400 residents in Elm Grove, Wisconsin (Waukesha County) through 110 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 277 total violations for this system , of which 44 (16%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 189 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 36 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, 78 of 202 UCMR5-tested systems have reported PFAS detections (38.6%).

Marian Heights Subdivision's 277 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
400
Total Violations
277
Health-Based Violations
44
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
110
County
Waukesha
School/Daycare
No
MCL Violations
36
Monitoring Violations
189
Treatment Tech Violations
8

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 36 2015
Coliform (TCR) MR 36 2002
Consumer Confidence Rule Other 33 2010
Lead and Copper Rule MR 13 2018
Mercury MR 10 1995
Arsenic MR 10 1995
Cadmium MR 10 1995
Chromium MR 10 1995
Fluoride MR 10 1995
Nitrate MR 10 1995
Barium MR 10 1995
Nitrite MR 10 1995
Selenium MR 10 1995
Nitrate-Nitrite MR 10 1995
Public Notice Other 9 2009
Combined Radium (-226 and -228) MR 9 1996
Radium-228 MR 9 1996
Gross Alpha, Excl. Radon and U MR 9 1996
Radium-226 MR 9 1996
Lead and Copper Rule TT 8 2007
E. COLI MR 4 2019

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 Marian Heights Subdivision.

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 WI2680203 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 Marian Heights Subdivision 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
2019 E. COLI MR 4 SDWIS / WI2680203 / 3014
2018 Lead and Copper Rule MR 13 SDWIS / WI2680203 / 5000
2015 Coliform (TCR) MCL 36 SDWIS / WI2680203 / 3100
2010 Consumer Confidence Rule Other 33 SDWIS / WI2680203 / 7000
2009 Public Notice Other 9 SDWIS / WI2680203 / 7500
2007 Lead and Copper Rule TT 8 SDWIS / WI2680203 / 5000
2002 Coliform (TCR) MR 36 SDWIS / WI2680203 / 3100
1996 Combined Radium (-226 and -228) MR 9 SDWIS / WI2680203 / 4010
1996 Radium-228 MR 9 SDWIS / WI2680203 / 4030
1996 Gross Alpha, Excl. Radon and U MR 9 SDWIS / WI2680203 / 4000
1996 Radium-226 MR 9 SDWIS / WI2680203 / 4020
1995 Mercury MR 10 SDWIS / WI2680203 / 1035
1995 Arsenic MR 10 SDWIS / WI2680203 / 1005
1995 Cadmium MR 10 SDWIS / WI2680203 / 1015
1995 Chromium MR 10 SDWIS / WI2680203 / 1020

How Marian Heights Subdivision Compares

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

Metric Marian Heights Subdivision Wisconsin avg Federal benchmark
Total violations 277 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 44 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 400 467 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 Marian Heights Subdivision water safe to drink? ▼
Marian Heights Subdivision (PWS ID: WI2680203) has 277 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 400 people using Groundwater sources.
How many people does Marian Heights Subdivision serve? ▼
Marian Heights Subdivision serves 400 people in Elm Grove, Wisconsin. It is a Private-owned system using Groundwater water sources with 110 service connections.
What type of violations does Marian Heights Subdivision have? ▼
Marian Heights Subdivision has 277 total violations: 44 health-based violations (MCL exceedances or treatment failures), 189 monitoring/reporting violations, and 8 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Marian Heights Subdivision water? ▼
No PFAS testing data is available for Marian Heights Subdivision under the EPA's UCMR5 monitoring program.
What water source does Marian Heights Subdivision use? ▼
Marian Heights Subdivision 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.
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.