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Counties → Iowa

Winneshiek County, Iowa

SDWIS compliance plate

Sheet IA191 · Winneshiek County 43 sys · 3,380 viol · #2035/3254

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

  • VIOL-SEVERE 95.3% flagged
  • HEALTH-LOW 17.7% health
  • RANK-LOWER #2035/3254
  • PHOTO-FINISH ±0.1 pp
  • PFAS-HIGH 100.0% detect
  • SRC-GW GW lead 100%
  • SYS-MID 43 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Dallas County (+ 0.1 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Winneshiek County ranks #2,035 of 3,254 counties by people served, and #40 of 99 counties in Iowa. See methodology · corpus placement.

Winneshiek County standing, mid-flagged corpus third

Flagged-system rate 95.3% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 17.7% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #2,035 of 3,254 · #40 of 99 in Iowa.

Flagged-rate neighbourhood around Winneshiek County

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

0% 20% 40% 60% 80% 100% Mahaska · lowest Harrison · near Dallas · near Ringgold · highest 75% 95% 95% 95.3% 95.5% 95.5% 100%

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

Water Systems

System Name Population Violations PFAS
Decorah Water Department 7,615 17 Detected
Calmar Water Supply 1,125 58 -
Ossian Water Supply 802 13 -
Freeport Water District 775 7 -
The Country Express 515 3 -
Turkey Valley Community School 490 66 -
Spillville Water Supply 385 6 -
Fort Atkinson Water Works 347 44 -
Ridgeway, City Of 275 98 -
South Winn Golf Club 218 68 -
Our Lady of Seven Dolors Parish 210 13 -
Castalia Water Works 145 56 -
Frankville RWD 135 0 -
Harvest Farm Campground LLC 129 12 -
Washington Prairie Lutheran Church 124 165 -
Pulpit Rock Camp Grounds 112 10 -
Decorah Sales Commission 105 91 -
Seed Savers Exchange 100 44 -
Silvercrest Golf & Country Club, Inc. 88 230 -
Scenic View Estates 78 100 -
Sherman Place Water & Road, Inc. 73 141 -
Jackson Heights Golf Course 72 37 -
Bluffton Resort 60 425 -
Highland General Store & Campground 59 234 -
Twin Springs Supper Club, L.L.C. 52 21 -
Burr Oak Lutheran Church 50 30 -
Kendallville Park 50 47 -
Bodensteiner Implement Company 50 37 -
Decorah Fish Hatchery 50 19 -
Laura Ingalls Wilder Museum Well 46 16 -
Windridge Implements L.L.C. 45 82 -
Pine Bluff 4H Camp 41 13 -
Barneys Bar and Grill 35 89 -
The Zipper 35 436 -
Under the Stars at Chimney Rock Cg LLC 33 111 -
Twin Springs Camp Area 32 19 -
Plantation Country View Subdivision 32 23 -
Henning Commercial Subdivision 31 0 -
Deerfield Heights Association 28 87 -
K-Town Tap 25 319 -
Pinters Garden Center & Pumpkin Patch 25 13 -
Big Springs Well 25 9 -
Lake Meyer Park 25 71 -

Compare beyond Iowa

Mid-flagged peers for Winneshiek County

Cross-state counties nearest Winneshiek County on flagged-system share (95.3%) and cumulative violation count (3,380). 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.