PlainWater
Counties → Wisconsin

Ozaukee County, Wisconsin

Water Systems
252
Population Served
91,746
Total Violations
13,722
1,863 health-based
PFAS Detected
3
of 5 tested

Violation Analysis

77.0%
Systems with Violations
54.5
Avg Violations per System
13.6%
Health-Based Violations

Water Source Types

GW
48 systems (19%)
SW
2 systems (1%)

PFAS Contamination

5
Systems Tested
3
PFAS Detected
60.0%
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

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

No violations on record (12) One or more violations (38)

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
Port Washington Waterworks 12,853 38 Clean
Grafton Waterworks 12,269 237 Clean
Cedarburg L & W Commission 11,800 107 Clean
Mequon Water Utility 11,152 91 Clean
Saukville Waterworks 4,268 4 Detected
Belgium Waterworks 2,493 54 -
Fredonia Waterworks 2,279 35 -
Homestead High School 1,650 79 -
McDonalds Mequon 1,524 114 -
Concordia University 1,500 27 -
Walgreens in Mequon 912 0 -
Kwik Trip 817 0 -
Mequon Trail Townhomes 615 37 -
Huntington Park 600 17 -
Christ Church Mequon 600 0 -
Christ Alone Lutheran School & Church 559 433 -
St Francis Borgia Catholic Church 510 0 -
Waynes Drive-IN 510 0 -
Missing Links Golf Range 502 3 -
Alliance Bible Church 457 0 -
Village Bp 452 32 -
River Barn Park 450 0 -
St Francis Borgia Educational & Activity Center 420 0 -
Welcome Mart 405 9 -
Ozaukee Congreg Church & Parish House 402 29 -
Ozaukee Congreg Fellowship Hall 401 25 -
Glen Oaks Office Park 400 11 -
WI DNR Harrington Beach Shower Bldg 400 16 -
Camp Jcc Gym 368 0 -
Hb Performance Systems Inc 315 16 -
Portview Church 308 64 -
J Mobil Mequon 304 22 -
Camp Jcc East End Well 300 43 -
Beechwood Farms Estates 300 18 -
Westchester Lakes Subdivision 300 36 -
Kingdom Hall Jehovahs Witnesses - Mequon 300 0 -
Bog Golf Course the Barn 300 0 -
Cedar Valley Cheese 265 12 -
Park Place Subdivision 260 6 -
Camp Jcc Pool & Lodge 258 8 -
Cornerstone Church 253 0 -
Trinity Ev Lutheran School & Church - Freistadt 250 86 -
Riversite 250 26 -
Reuter Pavilion 250 6 -
Christian Life Church & Kids Rule Academy 210 23 -
The Highland House 205 37 -
Chucks Place 204 22 -
Virmond Park 200 12 -
Covered Bridge Park 200 16 -
Brighton Ridge Subdivision 200 142 -

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 Ozaukee County? ▼
Ozaukee County has 13,722 total drinking water violations across 252 water systems, of which 1,863 are health-based violations. 77.0% of systems have at least one violation.
How many people get water from Ozaukee County systems? ▼
Water systems in Ozaukee County serve approximately 91,746 people through 252 public water systems.
Has PFAS been detected in Ozaukee County water? ▼
Of 5 water systems tested for PFAS in Ozaukee County, 3 had PFAS detected (60.0% detection rate).
What types of water sources supply Ozaukee County? ▼
Water systems in Ozaukee County use GW (48 systems), SW (2 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. 13.6% of Ozaukee 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.