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Counties → Illinois

Carroll County, Illinois

SDWIS compliance plate

Sheet IL015 · Carroll County 41 sys · 2,138 viol · #2093/3254

VIOL-SEVERE · HEALTH-MID · RANK-LOWER · PHOTO-FINISH · PFAS-NONE · SRC-GW · SYS-MID · BOOK-MOST

  • VIOL-SEVERE 95.1% flagged
  • HEALTH-MID 24.7% health
  • RANK-LOWER #2093/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-NONE No UCMR5 set
  • SRC-GW GW lead 100%
  • SYS-MID 41 systems
  • BOOK-MOST 6/7 fields

Nearest flagged-rate peer: Putnam County (+ 0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Carroll County ranks #2,093 of 3,254 counties by people served, and #67 of 102 counties in Illinois. See methodology · corpus placement.

Carroll County standing, mid-flagged corpus third

Flagged-system rate 95.1% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 24.7% is health-based share above the upper third (> 24.5%) . No UCMR5 tests in this extract for Carroll County . Population served ranks #2,093 of 3,254 · #67 of 102 in Illinois.

Flagged-rate neighbourhood around Carroll County

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

0% 20% 40% 60% 80% 100% Sangamon · lowest Putnam · near Williamson · near Pulaski · highest 58.8% 95.1% 95.5% 96% 96.2% 96.2% 100%

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

Water Systems

System Name Population Violations PFAS
Savanna 3,020 30 -
Thomson Maximum Security Center 2,166 0 -
Lanark 1,504 23 -
Mount Carroll 1,479 92 -
Milledgeville 989 39 -
Shannon 801 391 -
Thomson 580 19 -
Chadwick 523 65 -
Old Mill Park 250 22 -
Timberlake Resort 200 15 -
Lake Carroll Clubhouse 200 14 -
Lake Carroll Beach 200 27 -
Lake Carroll Campground 200 17 -
Maclean Fogg M1 Metform 192 37 -
Maclean Fogg-Hot Form Plant 150 67 -
Lake Carroll Ski-Lodge 100 14 -
Sandburr Run 100 31 -
Danisco 82 7 -
Carroll Heights Utilities Company 80 916 -
Mississippi Palisades St Park -Well Fork 80 3 -
Palisades Golf Course 75 31 -
Mississippi Palisades St Park - Lookout 75 2 -
Fin and Feather Camping Resort 60 7 -
Spring Lake Resort 50 9 -
Seven Eagles Resort- New Well 50 15 -
Seven Eagles Resort- Sites 1-20 35 15 -
Majestic Pines 33 38 -
Trailside Enterprises Inc 30 15 -
Riverview Lodge 25 30 -
Strope's Campground 25 44 -
Mississippi Palisades St Park - Plateau 25 3 -
Lake Carroll Marina 25 15 -
Seven Eagles Resort- Motel/Bath 25 6 -
Sullivans Food 25 7 -
Ingersoll Wetlands Learning Center 25 1 -
Lake Carroll Pool 25 18 -
Maranatha Prayer Camp-Church 25 13 -
Maranatha Prayer Camp-Church Dorm 25 10 -
Hickory Hideaway Cabins 25 5 -
Maranatha Prayer Camp-Blue Dorm 25 25 -
Lake Carroll Golf Course 25 0 -

Compare beyond Illinois

Mid-flagged peers for Carroll County

Cross-state counties nearest Carroll County on flagged-system share (95.1%) and cumulative violation count (2,138). 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.