PlainWater
Counties → Wisconsin

Rock County, Wisconsin

Water Systems
156
Population Served
148,582
Total Violations
3,788
1,471 health-based
PFAS Detected
1
of 6 tested

Violation Analysis

78.2%
Systems with Violations
24.3
Avg Violations per System
38.8%
Health-Based Violations

Water Source Types

GW
50 systems (32%)

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

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

No violations on record (6) One or more violations (44)

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
Janesville Water Utility 64,415 14 Clean
Beloit City Of 36,677 37 Detected
Evansville Waterworks 5,703 83 Clean
Milton Waterworks 5,588 86 Clean
Edgerton Waterworks 5,512 51 Clean
WI DOT Rest Area 22 Turtle 3,005 34 -
WI DOT Rest Area 17 Milton 2,503 23 -
Clinton Waterworks 2,119 221 Clean
Orfordville Waterworks 1,475 44 -
Culvers of Newville 1,233 102 -
Rockvale MHP 1,200 23 -
McDonalds Newville 1,085 49 -
Footville Waterworks 816 37 -
Lakeland Camp & Trailer Park 755 2 -
Rock River Leisure Estates Coop 650 24 -
Carls Shell/Taco Johns 520 18 -
Milton KOA RV Resort 505 2 -
Jakes Mobil 465 9 -
Station 51 LLC 412 2 -
Luther Valley Church 401 2 -
Blackhawk RV LLC 1 Restaurant 356 2 -
Blackhawk RV Eagle Hill 356 22 -
Blackhawk RV LLC 3 Wigwam 350 2 -
Fairbanks Morse Engine Div 330 19 -
Rock River Thresheree Restrooms 302 7 -
Rock River Thresheree Shelter 302 15 -
Caravilla Education and Rehab Center 298 74 -
Newville Travel Centersubway 254 18 -
Ste Well 1 250 4 -
Wrights Mobile Home Park 240 35 -
Fulton Congregational Church 232 2 -
Butterfly Supper Club 222 22 -
Anchor Inn 220 6 -
Red Barn Tavern LLC 210 5 -
Heritage Hall 210 2 -
Rock River Heritage Park 5 210 0 -
Oak Ridge Golf Course 208 0 -
Beloit Youth Sports Complex 208 0 -
Rock Prairie United Pres Ch 206 20 -
Riverside Mobil 205 0 -
Westside Baptist Church 201 14 -
Fulton Utility District 200 26 -
Lakeland Campground Store 200 0 -
Bass Creek Golf Club 200 11 -
Alliant Energy & Wp&l Co Maintenance 180 14 -
Stagecoach Inn 175 17 -
Beloit Club 174 5 -
Evansville Golf Club Clubhouse 168 0 -
Midway Village Mobile Home Park 160 27 -
Shady Hill Mobile Home Park 140 280 -

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 Rock County? ▼
Rock County has 3,788 total drinking water violations across 156 water systems, of which 1,471 are health-based violations. 78.2% of systems have at least one violation.
How many people get water from Rock County systems? ▼
Water systems in Rock County serve approximately 148,582 people through 156 public water systems.
Has PFAS been detected in Rock County water? ▼
Of 6 water systems tested for PFAS in Rock County, 1 had PFAS detected (16.7% detection rate).
What types of water sources supply Rock County? ▼
Water systems in Rock 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. 38.8% of Rock 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.