PlainWater
Counties → Wisconsin

Monroe County, Wisconsin

Water Systems
97
Population Served
39,109
Total Violations
2,390
826 health-based
PFAS Detected
1
of 3 tested

Violation Analysis

80.4%
Systems with Violations
24.6
Avg Violations per System
34.6%
Health-Based Violations

Water Source Types

GW
50 systems (52%)

PFAS Contamination

3
Systems Tested
1
PFAS Detected
33.3%
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

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

No violations on record (4) One or more violations (46)

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
Sparta Waterworks 10,025 24 Clean
Fort McCoy North Post 10,000 262 Clean
Tomah Waterworks 9,192 127 Detected
Cashton Waterworks 1,120 48 -
Brookwood High School 700 8 -
Norwalk Waterworks 653 32 -
Warrens Waterworks 540 75 -
Wilton Waterworks 490 40 -
Kendall Waterworks 458 79 -
WI DOT Rest Area 16 Sparta 440 91 -
Oakdale Waterworks 317 11 -
Fort McCoy South Post 250 104 -
Fort McCoy Range 34 200 26 -
Ambassador Baptist Church 200 42 -
St Michaels Catholic Church 150 7 -
Vpp Group LLC 150 13 -
Cortland Acres 145 12 -
Western Technical College-Sparta 135 2 -
Wyeville Elementary School 130 14 -
WI DNR Mill Bluff Beach 125 51 -
WI DNR Mill Bluff Office 125 55 -
Rockland Industrial Products 120 0 -
Fort McCoy Range 2 100 8 -
Monroe Co McMullen Park-Camping East 100 8 -
Hiawatha Golf Club 4 100 9 -
Monroe Co McMullen Park-Camping West 100 14 -
Monroe Co McMullen Park-Fish House 100 14 -
J&m Flying Wheels 100 11 -
Evergreen Supper Club 100 0 -
Fort McCoy Range 32 100 4 -
Monroe Co McMullen Park-Bathhouse 100 17 -
Fort McCoy Range 101 100 4 -
Fort McCoy Range 18 100 8 -
Smart Sand Inc - Main Office 97 0 -
Immanuel Lutheran Church 80 6 -
Ocean Spray Cranberry Inc 75 26 -
Almost Home Bar & Grill 75 31 -
St Matthews Lutheran Church 75 0 -
Monkeys Roost 75 32 -
Club Oasis 75 3 -
Covia Holdings Corporation 70 8 -
Big Dans Longbranch 60 42 -
Backwater Bar and Grill 50 148 -
Duffys Roadhouse 50 59 -
St Johns Lutheran Church 50 21 -
First Cong Ch of Leon 50 26 -
Leon Country Tavern 50 10 -
WI DNR Elroy Sparta Bike Trail - Sparta Campground W 50 28 -
Open Door Baptist Church 50 38 -
Cataract Methodist Church 40 21 -

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 Monroe County? ▼
Monroe County has 2,390 total drinking water violations across 97 water systems, of which 826 are health-based violations. 80.4% of systems have at least one violation.
How many people get water from Monroe County systems? ▼
Water systems in Monroe County serve approximately 39,109 people through 97 public water systems.
Has PFAS been detected in Monroe County water? ▼
Of 3 water systems tested for PFAS in Monroe County, 1 had PFAS detected (33.3% detection rate).
What types of water sources supply Monroe County? ▼
Water systems in Monroe 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. 34.6% of Monroe 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.