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Counties → Wisconsin

Winnebago County, Wisconsin

SDWIS compliance plate

Sheet WI139 · Winnebago County 152 sys · 1,690 viol · #418/3254

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

  • VIOL-SEVERE 67.1% flagged
  • HEALTH-MID 35.0% health
  • RANK-TOP #418/3254
  • PHOTO-FINISH ±0.4 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 97%
  • SYS-LARGE 152 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Juneau County ( -0.4 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Winnebago County ranks #418 of 3,254 counties by people served, and #7 of 71 counties in Wisconsin. See methodology · corpus placement.

Winnebago County standing, lower-flagged corpus third

Flagged-system rate 67.1% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 35.0% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #418 of 3,254 · #7 of 71 in Wisconsin.

Flagged-rate neighbourhood around Winnebago County

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

0% 20% 40% 60% 80% 100% Bayfield · lowest Juneau · near Winnebago · this county Milwaukee · highest 52.1% 66.3% 66.7% 66.7% 67.1% 67.7% 95.3%

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

Water Systems

System Name Population Violations PFAS
Oshkosh Waterworks 63,000 20 Clean
Neenah Waterworks 27,506 46 Clean
Fox Crossing Utilities West 18,000 6 Clean
Menasha Elec & Water Util 15,144 18 Clean
Fox Crossing Utilities East 10,927 7 Clean
Algoma TN Sanitary Dist 1 3,935 0 -
Omro Waterworks 3,629 8 Clean
Winneconne Waterworks 2,502 169 -
J J Keller Vinland Plant 520 4 -
Lakeside Elementary School 315 24 -
N & M Transfer Company Well 3 175 12 -
Advanced Manufacturing Tech Ctr 150 0 -
Countryside Christian Church 125 0 -
Oshkosh Country Club Clubhouse 110 10 -
Oinks 110 38 -
Haases Supper Club 110 13 -
Cattails Supper Club 110 10 -
Winagamie Golf Course 110 10 -
Winklers Westward Ho 110 9 -
Ridgeway Bp 107 33 -
Fox River Valley Ethanol LLC 100 102 -
Bare Bones 100 0 -
J J Keller North Park Office 90 4 -
Quality Paint & Coatings Oshkosh 90 6 -
Winnebago Area Sanitary District 90 1 -
Rolling Meadows of Larsen LLC 85 68 -
Willow Pines Mfd Home Community 70 41 -
Kimberly-Clark Corporation Kcpx Facility 70 0 -
Team Winnebagoland 65 0 -
Acton Academy Main 64 1 -
Wsi 8520 & 8525 Martin Dr 60 0 -
Great Lakes Veterinary Clinic 59 0 -
Winne Y Co 50 14 -
Utica Golf Club 50 14 -
We Community Church Eureka 50 59 -
Far Vu Golf Course 50 1 -
Century Elm Supper Club 50 27 -
Winchester, The 50 8 -
Winchester Hills Golf Course 50 0 -
YMCA Tennis Ctr 50 6 -
Jesuit Retreat House Chapel 50 0 -
We Community Church Waukau 50 21 -
Winnebago Co Pk Shelter 2 50 6 -
Winnebago Co Pk Shelter 1 50 6 -
Winnebago Co Pk Shelter 3 50 7 -
Winnebago Co Pk Shelter 4 50 6 -
Winnebago Co Pk Bathhouse 50 10 -
Jimmies White House Inn 50 5 -
Gala Resort & Cmpgd 50 14 -
Ridgeway Country Club Clubhouse 50 0 -

Compare beyond Wisconsin

Lower-flagged peers for Winnebago County

Cross-state counties nearest Winnebago County on flagged-system share (67.1%) and cumulative violation count (1,690). 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.