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Counties → Wisconsin

Waukesha County, Wisconsin

Water Systems
590
Population Served
322,690
Total Violations
24,998
7,359 health-based
PFAS Detected
8
of 13 tested

Violation Analysis

77.5%
Systems with Violations
42.4
Avg Violations per System
29.4%
Health-Based Violations

Water Source Types

GW
46 systems (8%)
SW
4 systems (1%)

PFAS Contamination

13
Systems Tested
8
PFAS Detected
61.5%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Waukesha Wisconsin water systems by violation status, EPA SDWIS records.

No violations on record (8) One or more violations (42)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Waukesha Water Utility 70,718 2,969 Clean
Brookfield Water Utility 29,070 504 Detected
New Berlin Water Utility 27,899 675 Clean
Menomonee Falls Ww - Surface Water 23,867 87 Clean
Oconomowoc Waterworks 15,805 26 Detected
Sussex Village Hall & Water Utility 11,750 1,254 Clean
Hartland Waterworks 9,212 21 Detected
Pewaukee City Water and Sewer Utility 8,671 467 Detected
Mukwonago Waterworks 8,190 284 Clean
Pewaukee Village Waterworks 8,166 175 Clean
Muskego Water Utility 8,150 108 Clean
Town of Brookfield San Dist 4 6,419 216 Detected
Dousman Water Utility 2,350 129 -
Butler Waterworks 2,181 61 -
Prairie Village Water Trust 2,100 253 -
Eagle Waterworks 1,950 253 -
Wales Pick N Save 1,900 51 -
Kwik Trip #1108 1,810 0 -
Menomonee Falls Ww - Groundwater 1,796 271 -
Kettle Moraine High School & Wales Elem School 1,670 14 -
Fleet Farm Muskego Main Store 1,585 0 -
Kwik Trip #973 1,404 0 -
New Berlin West Middle High School 1,380 330 Clean
Elmbrook Memorial Hospital 1,250 169 -
McDonalds Vernon 1,250 118 -
Merton Intermediate & Primary School 1,130 21 -
Pilgrim Park Middle School 950 281 -
Kwik Trip 360 Oconomowoc 906 0 -
Mill Creek Academy 886 2 -
Generac Power Systems Inc 875 8 -
Lake Denoon Middle School 825 35 -
Cross Point Community Church 764 0 -
Lake Meadows Water Trust 750 702 -
Hale Park Meadows 720 179 -
Christ Lutheran School and Church 704 202 -
Durham Meadows Water Trust 700 3 -
Rolling Hills Elementary Schl 666 8 -
Waukesha Bible Church 654 0 -
Rose Glen Elementary 652 50 -
Dayspring Baptist Church Inc 636 0 -
Lake Country School 623 110 -
St Marys School & St Marys Parish 606 95 -
Elmbrook- Lake Country 600 8 -
Delafield Square 587 10 -
Nrf VIII - Autumn Grove LLC 578 0 -
Dotties Home Bakery & Liquor 567 9 -
Prairie View Elementary School 565 2 -
Abundant Life Apostolic Church 543 114 -
Section Elementary School 540 8 -
Richmond School 533 5 -

Other Counties in Wisconsin

Milwaukee County
85 systems · 953,104 served · 2,602 violations
Dane County
301 systems · 517,785 served · 7,065 violations
Brown County
149 systems · 246,872 served · 2,891 violations
Outagamie County
107 systems · 179,535 served · 1,999 violations
Racine County
195 systems · 179,476 served · 10,597 violations
Winnebago County
152 systems · 151,482 served · 1,690 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Waukesha County? ▼
Waukesha County has 24,998 total drinking water violations across 590 water systems, of which 7,359 are health-based violations. 77.5% of systems have at least one violation.
How many people get water from Waukesha County systems? ▼
Water systems in Waukesha County serve approximately 322,690 people through 590 public water systems.
Has PFAS been detected in Waukesha County water? ▼
Of 13 water systems tested for PFAS in Waukesha County, 8 had PFAS detected (61.5% detection rate).
What types of water sources supply Waukesha County? ▼
Water systems in Waukesha County use GW (46 systems), SW (4 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 29.4% of Waukesha County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

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 page draws directly on 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.