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Counties → Illinois

Winnebago County, Illinois

SDWIS compliance plate

Sheet IL201 · Winnebago County 196 sys · 12,949 viol · #272/3254

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

  • VIOL-SEVERE 92.3% flagged
  • HEALTH-LOW 10.3% health
  • RANK-TOP #272/3254
  • PHOTO-FINISH ±0.7 pp
  • PFAS-HIGH 66.7% detect
  • SRC-GW GW lead 99%
  • SYS-LARGE 196 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Christian County ( -0.7 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Winnebago County ranks #272 of 3,254 counties by people served, and #9 of 102 counties in Illinois. See methodology · corpus placement.

Winnebago County standing, lower-flagged corpus third

Flagged-system rate 92.3% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 10.3% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 66.7% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #272 of 3,254 · #9 of 102 in Illinois.

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% Sangamon · lowest Christian · near Winnebago · this county Pulaski · highest 58.8% 91.4% 91.7% 91.7% 92.3% 93.3% 100%

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

Water Systems

System Name Population Violations PFAS
Rockford 147,051 268 Detected
North Park Pwd 35,580 33 Detected
Loves Park 23,335 237 Clean
IL American-South Beloit 7,893 108 Detected
Rockton 7,685 212 Detected
Cherry Valley 4,731 22 Clean
Winnebago 3,000 76 -
Otter Creek Lake Utilities District 2,342 138 -
Pecatonica 2,195 75 -
Prairie Path Water Company-Westlake 1,493 6 -
Durand 1,427 83 -
Prairie Path Water Company-Coventry Hill 882 12 -
Turtle Creek Rest Area 700 11 -
Forest View MHP 650 4 -
Stone Creek School 543 14 -
Mancuso Village Park MHP 537 134 -
South Bluff MHP 507 4 -
Rock Cut St Pk-Beach Well 500 6 -
I-39 Shell Express 500 9 -
Prairie Path Water Company-Wildwood 490 37 -
Ledgewood Elementary School 470 220 -
Prairie Path Water Co-Coventry Creek 388 250 -
Legacy Academy 325 220 -
Pearl Lake RV Resort LLC-Clubhouse 300 10 -
Berean Baptist Church 300 44 -
Pearl Lake RV Resort LLC-Bathhouse 300 12 -
YMCA Camp Winnebago-Standing Bear Well 300 15 -
YMCA Camp Winnebago-Wilderness Well 300 6 -
YMCA Camp Winnebago - Webvillion 300 11 -
Mauh-Nah-Tee-See C C 277 23 -
Rivers Edge Campground 275 4 -
Legend Lakes Water Association 250 31 -
Green Meadow Estates of Rockford LLC 250 285 -
Rockford Speedway Convention C 250 8 -
Lakeside Plaza on Best Road 250 13 -
Bill-Mar Heights MHP 240 199 -
Shirland School 200 31 -
Riveras Fresh Market 200 3 -
Ledges Swim Club 175 31 -
Tpg Pressure, Inc. 151 651 -
Prairie Road Pump Corporation 150 45 -
Atwood Homestead Club House 150 1 -
Blackhawk Farms Raceway 150 7 -
New Milford Express 150 13 -
Forest Hills Diamonds 150 39 -
Pbc Linear 140 1,416 -
Mr Cs Family Restaurant 125 21 -
Rockford Mutual Insurance Co 125 417 -
Aqua Illinois-Sheridan Grove 120 2 -
Deans Illinois Dairies 110 442 -

Compare beyond Illinois

Lower-flagged peers for Winnebago County

Cross-state counties nearest Winnebago County on flagged-system share (92.3%) and cumulative violation count (12,949). 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.