PlainWater
Counties → Wisconsin

Jefferson County, Wisconsin

Water Systems
194
Population Served
90,591
Total Violations
2,740
1,071 health-based
PFAS Detected
1
of 6 tested

Violation Analysis

68.6%
Systems with Violations
14.1
Avg Violations per System
39.1%
Health-Based Violations

Water Source Types

GW
50 systems (26%)

PFAS Contamination

6
Systems Tested
1
PFAS Detected
16.7%
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

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

No violations on record (10) One or more violations (40)

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
Watertown Waterworks 23,945 35 Clean
Fort Atkinson Waterworks 12,390 30 Clean
Jefferson Waterworks 7,926 61 Clean
Lake Mills Waterworks 6,211 159 Clean
Waterloo Waterworks 3,520 50 Clean
Johnson Creek Waterworks 3,318 121 -
WI DOT Rest Area 14 Aztalan 3,204 47 -
WI DOT Rest Area 13 Aztalan 3,004 72 -
Palmyra Waterworks 1,756 57 Detected
River Bend Resort 1,520 5 -
T&s Buss Inc 864 0 -
Concord General Store 807 4 -
Olin-Sang-Ruby Union Institute - Main System 704 47 -
Olin-Sang-Ruby Union Institute - Bath House 700 0 -
Olin-Sang-Ruby Union Institute - Dining Hall 700 29 -
Lake Mills Travel Plaza 662 6 -
Hubbleton Brewing Taproom & Grill 610 6 -
Autumn Ridge Water System LLC 575 32 -
Faith Community Church/School 550 28 -
Spacious Acres Mobile Home Community 525 8 -
Tremain Mobile Home Park 475 36 -
Crawfish Junction 412 0 -
St Pauls Ev Lutheran Church 406 19 -
Station Ixonia 360 0 -
Silo Ridge Clubhouse 322 0 -
Ixonia Elementary School 310 108 -
Rons Market 308 0 -
Wishing Well RV Resort Lodge Well System 303 11 -
Grace Lutheran Church 302 6 -
First Congreg United Ch of Christ/Gingerbread Preschool 280 6 -
North Shore Chophouse 257 4 -
Wayside Tavern 251 18 -
Bark River Campground - Main Building System 250 2 -
WI DNR Glacial Drumlin Trail Sullivan Rst AR 250 107 -
Sullivan Elementary School 233 16 -
Immanuel Lutheran Church 231 3 -
Pernats of Ixonia 227 0 -
Rosy Lane Holsteins Farm Office 221 0 -
Lake Ripley Country Club - Clubhouse 208 8 -
Edge of Town Cafe 206 6 -
Lake Ripley Family Restaurant 206 0 -
Sullivan Saloon 205 0 -
Real Maccoy The 205 5 -
Koshkonong Mounds Country Club 204 3 -
Rome Riverside Campground 202 9 -
Bark River Lanes 201 27 -
Aztalan Inn 200 7 -
Wishing Well RV Resort Deep Well Syst 200 14 -
Von Loppys 177 3 -
Lakewood Village 160 13 -

Other Counties in Wisconsin

Milwaukee County
85 systems · 953,104 served · 2,602 violations
Dane County
301 systems · 517,785 served · 7,065 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

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Jefferson County? ▼
Jefferson County has 2,740 total drinking water violations across 194 water systems, of which 1,071 are health-based violations. 68.6% of systems have at least one violation.
How many people get water from Jefferson County systems? ▼
Water systems in Jefferson County serve approximately 90,591 people through 194 public water systems.
Has PFAS been detected in Jefferson County water? ▼
Of 6 water systems tested for PFAS in Jefferson County, 1 had PFAS detected (16.7% detection rate).
What types of water sources supply Jefferson County? ▼
Water systems in Jefferson 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. 39.1% of Jefferson 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.