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Counties → Wisconsin

Columbia County, Wisconsin

SDWIS compliance plate

Sheet WI021 · Columbia County 141 sys · 3,867 viol · #798/3254

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

  • VIOL-SEVERE 80.9% flagged
  • HEALTH-MID 33.9% health
  • RANK-UPPER #798/3254
  • PHOTO-FINISH ±0.2 pp
  • PFAS-HIGH 50.0% detect
  • SRC-GW GW lead 100%
  • SYS-LARGE 141 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Marathon County (+ 0.2 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Columbia County ranks #798 of 3,254 counties by people served, and #21 of 71 counties in Wisconsin. See methodology · corpus placement.

Columbia County standing, lower-flagged corpus third

Flagged-system rate 80.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 33.9% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #798 of 3,254 · #21 of 71 in Wisconsin.

Flagged-rate neighbourhood around Columbia County

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

0% 20% 40% 60% 80% 100% Bayfield · lowest Kewaunee · near Marathon · near Milwaukee · highest 52.1% 80.4% 80.6% 80.9% 81% 81.8% 95.3%

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

Water Systems

System Name Population Violations PFAS
Portage Waterworks 10,437 139 Detected
Columbus Utilities 5,173 151 Clean
WI DOT Rest Area 12 Dekorra West Bound 3,255 53 -
Wisconsin Dells Waterworks 3,232 32 -
Lodi Waterworks 3,146 51 -
Poynette Waterworks 2,520 74 -
WI DOT Rest Area 11 Dekorra East Bound 2,505 64 -
Pardeeville Waterworks 2,151 58 -
Harmony Grove San Dist 1,950 25 -
Randolph Water Dept 1,800 202 -
Fall River Waterworks 1,793 15 -
Rio Waterworks 1,095 69 -
Loves Travel Stops Poynette 1,051 0 -
Cascade Mtn Ski - 93 Well Main 967 0 -
Petro Travel Plaza #403 915 25 -
Pride of America Campground - Main System Wells 1 2 and 4 912 8 -
McDonalds Restaurant Poynette 845 237 -
Arlington Waterworks 823 50 -
Northpoint Plaza Bp 809 8 -
Wyocena Waterworks 768 16 -
Cambria Waterworks 767 52 -
Crystal Lake RV Resort LLC 725 127 -
All Stop Plaza 718 8 -
Saddle Ridge Estates 700 31 -
Luckys Bar & Grille on the Lake 606 5 -
Zion Ev Lutheran Church of Leeds 507 17 -
WI DOT Wayside 17 West Point 500 6 -
Sunset Harbor 410 20 -
Cascade Mtn Ski - Daisy Restaurant Well 400 0 -
Friesland Waterworks 345 127 -
Silver Springs Campsites Hilltop Well 320 1 -
Silver Springs Campsites Office and Pool 320 1 -
Cimarolis Supper Club 316 11 -
Camp Wawbeek - Respite Camp Lodge 306 0 -
Camp Wawbeek Nature Center - Main Well 306 0 -
Hookers Resort 306 9 -
Camp Wawbeek - Respite Camp Rec Center 306 0 -
Remis Thirsty Moose 305 0 -
Indian Trails Campground - Bath House 300 6 -
Indian Trails Campground - East Hill 300 2 -
Bethlehem Lutheran Church 252 0 -
Lake Wisconsin Country Club 250 5 -
Trienda Holdings LLC 240 114 -
Fitzs on the Lake 215 0 -
Triple Play Sports Bar & Grill 208 74 -
Indian Trails Campground - Restaurant 206 2 -
Subway Sandwiches - Poynette 205 7 -
Anchor at Lakeside Bar & Grill 204 28 -
Interstate Easy Stop 203 4 -
Portage One Stop 203 0 -

Compare beyond Wisconsin

Lower-flagged peers for Columbia County

Cross-state counties nearest Columbia County on flagged-system share (80.9%) and cumulative violation count (3,867). 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.