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Counties → Wisconsin

Ozaukee County, Wisconsin

SDWIS compliance plate

Sheet WI089 · Ozaukee County 252 sys · 13,722 viol · #617/3254

VIOL-SEVERE · HEALTH-LOW · RANK-TOP · PHOTO-FINISH · PFAS-LOW · SRC-GW · SYS-LARGE · BOOK-FULL

  • VIOL-SEVERE 77.0% flagged
  • HEALTH-LOW 13.6% health
  • RANK-TOP #617/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-LOW 20.0% detect
  • SRC-GW GW lead 99%
  • SYS-LARGE 252 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Taylor County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Ozaukee County ranks #617 of 3,254 counties by people served, and #16 of 71 counties in Wisconsin. See methodology · corpus placement.

Ozaukee County standing, lower-flagged corpus third

Flagged-system rate 77.0% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 13.6% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 20.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #617 of 3,254 · #16 of 71 in Wisconsin.

Flagged-rate neighbourhood around Ozaukee County

Lowest/highest poles plus in-state counties nearest Ozaukee County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.

0% 20% 40% 60% 80% 100% Bayfield · lowest Langlade · near Ozaukee · this county Milwaukee · highest 52.1% 76.6% 76.6% 76.7% 77% 77.5% 95.3%

Source: EPA SDWIS (county aggregates) As of 2026-05-15

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 -

Compare beyond Wisconsin

Lower-flagged peers for Ozaukee County

Cross-state counties nearest Ozaukee County on flagged-system share (77.0%) and cumulative violation count (13,722). In-state neighbours stay on the compliance plate above.

Similar flagged-system rate

Nearest cross-state counties by % of SDWIS systems with at least one violation on record.

4 peers

Similar violation load

Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).

4 peers

Read our methodology · Check your water system - 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

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.