PlainWater
Counties → Wisconsin

Dane County, Wisconsin

Water Systems
301
Population Served
517,785
Total Violations
7,065
1,952 health-based
PFAS Detected
6
of 15 tested

Violation Analysis

62.1%
Systems with Violations
23.5
Avg Violations per System
27.6%
Health-Based Violations

Water Source Types

GW
50 systems (17%)

PFAS Contamination

15
Systems Tested
6
PFAS Detected
40.0%
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

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

No violations on record (2) One or more violations (48)

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
Madison Water Utility 272,000 327 Detected
Sun Prairie Utilities 33,966 124 Clean
Fitchburg Utility Dist 1 24,500 53 Clean
Middleton Waterworks 23,868 121 Clean
Waunakee Waterworks 14,879 35 Clean
Verona Waterworks 14,030 28 Detected
Stoughton Waterworks 13,078 10 Detected
Oregon Waterworks 11,200 47 Clean
Deforest Waterworks 10,500 20 Clean
McFarland Waterworks 9,676 29 Detected
Cottage Grove Waterworks 9,345 19 Clean
Monona Waterworks 8,624 30 Detected
Mt Horeb Waterworks 7,756 182 Detected
Windsor Water Utility South 4,607 16 -
Cross Plains Waterworks 4,100 18 Clean
Marshall Waterworks 3,862 43 Clean
Mendota Mental Health Inst 2,787 17 -
Deerfield Waterworks 2,510 45 -
McDonalds Milw St 1,940 114 -
Mazomanie Waterworks 1,744 28 -
Shorewood Hills Waterworks 1,670 34 -
Cambridge Water & Sewer Utility 1,638 246 -
Black Earth Waterworks 1,493 39 -
Maple Bluff Waterworks 1,342 34 -
Road Ranger Travel Center 1,267 17 -
Dane Waterworks 1,117 41 -
Pleasant Springs Travel Plaza 1,110 15 -
Kwik Trip 323 Verona 1,108 18 -
Oakhill Correctional Inst 1,096 19 -
Blue Mounds Waterworks 950 39 -
St Andrew Lutheran Church & Westside Christian School 850 169 -
Westport Water Utility 800 17 -
WI DNR Gov Nelson 3 Office & Shop 795 25 -
WI Heights High School 780 14 -
Madison Country Day School 660 193 -
Edgerton I90 Travel Plaza 533 328 -
Perry Lutheran Church 503 14 -
Bay View Heights Inc 450 65 -
Ehlenbachs Cheese Chalet 406 0 -
Lake Forest Water Coop 400 227 -
Windsor Water Utility North 400 33 -
Sunset Ridge Elementary School 400 4 -
Tyrol Basin Chalet 390 5 -
St Peter Catholic Church & School 385 141 -
West Middleton Elementary School 360 28 -
West Koshkonong Lutheran Church 352 37 -
Fitchburg Utility Dist 1 South 350 10 -
Viking Village Campground & Resort - North 315 0 -
Buddys River Resort 310 9 -
Quick Stop 308 19 -

Other Counties in Wisconsin

Milwaukee County
85 systems · 953,104 served · 2,602 violations
Waukesha County
590 systems · 322,690 served · 24,998 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 Dane County? ▼
Dane County has 7,065 total drinking water violations across 301 water systems, of which 1,952 are health-based violations. 62.1% of systems have at least one violation.
How many people get water from Dane County systems? ▼
Water systems in Dane County serve approximately 517,785 people through 301 public water systems.
Has PFAS been detected in Dane County water? ▼
Of 15 water systems tested for PFAS in Dane County, 6 had PFAS detected (40.0% detection rate).
What types of water sources supply Dane County? ▼
Water systems in Dane County use GW (50 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. 27.6% of Dane 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.