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Counties → Wisconsin

Dane County, Wisconsin

SDWIS compliance plate

Sheet WI025 · Dane County 301 sys · 7,065 viol · #135/3254

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

  • VIOL-SEVERE 62.1% flagged
  • HEALTH-MID 27.6% health
  • RANK-TOP #135/3254
  • PHOTO-FINISH ±0.8 pp
  • PFAS-MID 40.0% detect
  • SRC-GW GW lead 100%
  • SYS-LARGE 301 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Douglas County ( -0.8 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Dane County ranks #135 of 3,254 counties by people served, and #2 of 71 counties in Wisconsin. See methodology · corpus placement.

Dane County standing, lower-flagged corpus third

Flagged-system rate 62.1% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 27.6% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 40.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #135 of 3,254 · #2 of 71 in Wisconsin.

Flagged-rate neighbourhood around Dane County

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

0% 20% 40% 60% 80% 100% Bayfield · lowest Washburn · near Dane · this county Milwaukee · highest 52.1% 60.2% 60.8% 61.4% 62.1% 63% 95.3%

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

Water Systems

System Name Population Violations PFAS
Madison Water Utility 272,000 327 Detected
Sun Prairie Utilities 33,966 124 Clean
Fitchburg Utility Dist 1 24,500 53 Clean
Middleton Waterworks 23,868 121 Clean
Waunakee Waterworks 14,879 35 Clean
Verona Waterworks 14,030 28 Detected
Stoughton Waterworks 13,078 10 Detected
Oregon Waterworks 11,200 47 Clean
Deforest Waterworks 10,500 20 Clean
McFarland Waterworks 9,676 29 Detected
Cottage Grove Waterworks 9,345 19 Clean
Monona Waterworks 8,624 30 Detected
Mt Horeb Waterworks 7,756 182 Detected
Windsor Water Utility South 4,607 16 -
Cross Plains Waterworks 4,100 18 Clean
Marshall Waterworks 3,862 43 Clean
Mendota Mental Health Inst 2,787 17 -
Deerfield Waterworks 2,510 45 -
McDonalds Milw St 1,940 114 -
Mazomanie Waterworks 1,744 28 -
Shorewood Hills Waterworks 1,670 34 -
Cambridge Water & Sewer Utility 1,638 246 -
Black Earth Waterworks 1,493 39 -
Maple Bluff Waterworks 1,342 34 -
Road Ranger Travel Center 1,267 17 -
Dane Waterworks 1,117 41 -
Pleasant Springs Travel Plaza 1,110 15 -
Kwik Trip 323 Verona 1,108 18 -
Oakhill Correctional Inst 1,096 19 -
Blue Mounds Waterworks 950 39 -
St Andrew Lutheran Church & Westside Christian School 850 169 -
Westport Water Utility 800 17 -
WI DNR Gov Nelson 3 Office & Shop 795 25 -
WI Heights High School 780 14 -
Madison Country Day School 660 193 -
Edgerton I90 Travel Plaza 533 328 -
Perry Lutheran Church 503 14 -
Bay View Heights Inc 450 65 -
Ehlenbachs Cheese Chalet 406 0 -
Lake Forest Water Coop 400 227 -
Windsor Water Utility North 400 33 -
Sunset Ridge Elementary School 400 4 -
Tyrol Basin Chalet 390 5 -
St Peter Catholic Church & School 385 141 -
West Middleton Elementary School 360 28 -
West Koshkonong Lutheran Church 352 37 -
Fitchburg Utility Dist 1 South 350 10 -
Viking Village Campground & Resort - North 315 0 -
Buddys River Resort 310 9 -
Quick Stop 308 19 -

Compare beyond Wisconsin

Lower-flagged peers for Dane County

Cross-state counties nearest Dane County on flagged-system share (62.1%) and cumulative violation count (7,065). 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.