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Transient Non-Community Water System · PWS WI2682416

Brown Street Market Place

Oconomowoc, Wisconsin 53066-2488 - drinking water served from groundwater sources to 384 people, tracked in EPA SDWIS and UCMR5.

384
People served
134
EPA violations
10
Health-based
Untested
UCMR5 result

The verdict

EPA records 134 drinking-water violations at Brown Street Market Place, 7% of them health-based - above the Wisconsin per-system average.

134
Total EPA violations on record
7%
Health-based (MCL / treatment failure)
384
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Brown Street Market Place

Brown Street Market Place is a private-owned transient non-community water system that delivers drinking water to 384 residents in Oconomowoc, Wisconsin (Waukesha County) through 2 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 134 total violations for this system , of which 10 (7%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 123 monitoring and reporting violations are on file. The most recent violation on record dates to 2001.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 13 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%).

Brown Street Market Place's 134 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
384
Total Violations
134
Health-Based Violations
10
Water Source
Groundwater

System Details

System Type
Transient Non-Community
Owner Type
Private
Connections
2
County
Waukesha
School/Daycare
No
MCL Violations
10
Monitoring Violations
123
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 13 2001
Coliform (TCR) MCL 10 1997
Nitrate MR 9 2001
p-Dichlorobenzene MR 4 1996
Vinyl chloride MR 4 1996
1,2,4-Trichlorobenzene MR 4 1996
1,2-Dichloroethane MR 4 1996
1,1,1-Trichloroethane MR 4 1996
1,1,2-Trichloroethane MR 4 1996
Ethylbenzene MR 4 1996
Xylenes, Total MR 4 1996
1,2-Dichloropropane MR 4 1996
Tetrachloroethylene MR 4 1996
Toluene MR 4 1996
DICHLOROMETHANE MR 4 1996
Trichloroethylene MR 4 1996
CHLOROBENZENE MR 4 1996
Lead and Copper Rule MR 4 1998
Benzene MR 4 1996
o-Dichlorobenzene MR 4 1996
Carbon tetrachloride MR 4 1996
1,1-Dichloroethylene MR 4 1996
trans-1,2-Dichloroethylene MR 4 1996
Styrene MR 4 1996
cis-1,2-Dichloroethylene MR 4 1996
Mercury MR 1 1998
Nickel MR 1 1998
Nitrite MR 1 1998
Selenium MR 1 1998
Antimony, Total MR 1 1998

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 Brown Street Market Place.

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 WI2682416 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 Brown Street Market Place 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
2001 Coliform (TCR) MR 13 SDWIS / WI2682416 / 3100
2001 Nitrate MR 9 SDWIS / WI2682416 / 1040
1998 Lead and Copper Rule MR 4 SDWIS / WI2682416 / 5000
1998 Mercury MR 1 SDWIS / WI2682416 / 1035
1998 Nickel MR 1 SDWIS / WI2682416 / 1036
1998 Nitrite MR 1 SDWIS / WI2682416 / 1041
1998 Selenium MR 1 SDWIS / WI2682416 / 1045
1998 Antimony, Total MR 1 SDWIS / WI2682416 / 1074
1998 Fluoride MR 1 SDWIS / WI2682416 / 1025
1998 Cadmium MR 1 SDWIS / WI2682416 / 1015
1998 Nitrate-Nitrite MR 1 SDWIS / WI2682416 / 1038
1998 Barium MR 1 SDWIS / WI2682416 / 1010
1998 Thallium, Total MR 1 SDWIS / WI2682416 / 1085
1998 Arsenic MR 1 SDWIS / WI2682416 / 1005
1998 Beryllium, Total MR 1 SDWIS / WI2682416 / 1075

How Brown Street Market Place Compares

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

Metric Brown Street Market Place Wisconsin avg Federal benchmark
Total violations 134 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 10 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 384 467 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 Brown Street Market Place water safe to drink? ▼
Brown Street Market Place (PWS ID: WI2682416) has 134 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 384 people using Groundwater sources.
How many people does Brown Street Market Place serve? ▼
Brown Street Market Place serves 384 people in Oconomowoc, Wisconsin. It is a Private-owned system using Groundwater water sources with 2 service connections.
What type of violations does Brown Street Market Place have? ▼
Brown Street Market Place has 134 total violations: 10 health-based violations (MCL exceedances or treatment failures), 123 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Brown Street Market Place water? ▼
No PFAS testing data is available for Brown Street Market Place under the EPA's UCMR5 monitoring program.
What water source does Brown Street Market Place use? ▼
Brown Street Market Place 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.