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Community Water System · PWS WI2680862

Douglas Plaza South

Waukesha, Wisconsin 53186 - drinking water served from groundwater sources to 62 people, tracked in EPA SDWIS and UCMR5.

62
People served
138
EPA violations
0
Health-based
Untested
UCMR5 result

The verdict

EPA records 138 drinking-water violations at Douglas Plaza South - above the Wisconsin per-system average.

138
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
62
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Douglas Plaza South

Douglas Plaza South is a private-owned community water system that delivers drinking water to 62 residents in Waukesha, Wisconsin (Waukesha County) through 2 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 138 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 111 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is Consumer Confidence Rule, recorded in 22 violations (Other). 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%).

Douglas Plaza South's 138 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
62
Total Violations
138
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
2
County
Waukesha
School/Daycare
No
MCL Violations
0
Monitoring Violations
111
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Consumer Confidence Rule Other 22 2025
Coliform (TCR) MR 9 2010
Endrin MR 5 1994
Lead and Copper Rule MR 5 1995
BHC-GAMMA MR 4 1994
Toxaphene MR 4 1994
Dalapon MR 4 1994
Simazine MR 4 1994
Picloram MR 4 1994
Aldicarb sulfone MR 4 1994
Aldicarb MR 4 1994
Atrazine MR 4 1994
LASSO MR 4 1994
Heptachlor MR 4 1994
2,4-D MR 4 1994
HEXACHLOROBENZENE MR 4 1994
Pentachlorophenol MR 4 1994
Total Polychlorinated Biphenyls (PCB) MR 4 1994
Chlordane MR 4 1994
Methoxychlor MR 4 1994
OXAMYL MR 4 1994
Dinoseb MR 4 1994
Hexachlorocyclopentadiene MR 4 1994
Carbofuran MR 4 1994
Aldicarb sulfoxide MR 4 1994
2,4,5-TP MR 4 1994
Heptachlor epoxide MR 4 1994
Public Notice Other 1 2010
LEAD AND COPPER RULE REVISIONS RPT 1 2025

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 Douglas Plaza South.

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 WI2680862 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 Douglas Plaza South 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
2025 Consumer Confidence Rule Other 22 SDWIS / WI2680862 / 7000
2025 LEAD AND COPPER RULE REVISIONS RPT 1 SDWIS / WI2680862 / 5200
2010 Coliform (TCR) MR 9 SDWIS / WI2680862 / 3100
2010 Public Notice Other 1 SDWIS / WI2680862 / 7500
1995 Lead and Copper Rule MR 5 SDWIS / WI2680862 / 5000
1994 Endrin MR 5 SDWIS / WI2680862 / 2005
1994 BHC-GAMMA MR 4 SDWIS / WI2680862 / 2010
1994 Toxaphene MR 4 SDWIS / WI2680862 / 2020
1994 Dalapon MR 4 SDWIS / WI2680862 / 2031
1994 Simazine MR 4 SDWIS / WI2680862 / 2037
1994 Picloram MR 4 SDWIS / WI2680862 / 2040
1994 Aldicarb sulfone MR 4 SDWIS / WI2680862 / 2044
1994 Aldicarb MR 4 SDWIS / WI2680862 / 2047
1994 Atrazine MR 4 SDWIS / WI2680862 / 2050
1994 LASSO MR 4 SDWIS / WI2680862 / 2051

How Douglas Plaza South Compares

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

Metric Douglas Plaza South Wisconsin avg Federal benchmark
Total violations 138 26 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 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 62 467 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 Douglas Plaza South water safe to drink? ▼
Douglas Plaza South (PWS ID: WI2680862) has 138 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 62 people using Groundwater sources.
How many people does Douglas Plaza South serve? ▼
Douglas Plaza South serves 62 people in Waukesha, Wisconsin. It is a Private-owned system using Groundwater water sources with 2 service connections.
What type of violations does Douglas Plaza South have? ▼
Douglas Plaza South has 138 total violations: 0 health-based violations (MCL exceedances or treatment failures), 111 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Douglas Plaza South water? ▼
No PFAS testing data is available for Douglas Plaza South under the EPA's UCMR5 monitoring program.
What water source does Douglas Plaza South use? ▼
Douglas Plaza South 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.