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Counties → Illinois

McLean County, Illinois

SDWIS compliance plate

Sheet IL113 · McLean County 90 sys · 10,265 viol · #379/3254

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

  • VIOL-SEVERE 76.7% flagged
  • HEALTH-LOW 17.0% health
  • RANK-TOP #379/3254
  • PHOTO-FINISH ±0.3 pp
  • PFAS-MID 25.0% detect
  • SRC-GW GW lead 80%
  • SYS-MID 90 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Will County ( -0.3 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, McLean County ranks #379 of 3,254 counties by people served, and #13 of 102 counties in Illinois. See methodology · corpus placement.

McLean County standing, lower-flagged corpus third

Flagged-system rate 76.7% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 17.0% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 25.0% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #379 of 3,254 · #13 of 102 in Illinois.

Flagged-rate neighbourhood around McLean County

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

0% 20% 40% 60% 80% 100% Sangamon · lowest McLean · this county Clay · near Pulaski · highest 58.8% 76.4% 76.7% 77.8% 77.8% 78% 100%

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

Water Systems

System Name Population Violations PFAS
Bloomington 77,610 61 Detected
Normal 52,736 3 Clean
Illinois State University-Normal 6,600 100 Clean
Le Roy 3,498 105 Clean
Heyworth 2,853 5 -
Lexington 1,930 24 -
Hudson 1,847 88 -
Bloomington Township Pwd West Phase 1,800 17 -
Chenoa 1,785 127 -
Gridley 1,411 21 -
Hilltop MHP 1,360 92 -
Downs 1,201 196 -
Danvers 1,183 502 -
Colfax 989 104 -
Olympia School 918 632 -
Bloomington Township Pwd-Crestwicke 900 12 -
Mc Lean 791 38 -
Saybrook 679 278 -
Stanford 600 14 -
Carlock 562 203 -
Funks Grove Hwy Rest Area 500 20 -
North Meadow Village MHP 495 55 -
Towanda 480 63 -
Cornerstone Christian Academy 475 99 -
Timber Pointe - the Lodge 400 33 -
Blm Gw MHP, LLC 390 50 -
Bellflower 343 127 -
Meadows of Bloomington MHP 343 82 -
Victory Christian Center 325 853 -
Arrowsmith 315 58 -
Comlara Park Beach Well 300 24 -
Comlara Park Hq 300 26 -
Comlara Park Campground 300 24 -
Hazy Hills Golf Course 257 0 -
Willow Creek North MHP 250 81 -
Indian Creek Homeowners and Water Assn. 210 27 -
Ellsworth 200 162 -
Spin Lake Homeowners Association, Inc. 200 134 -
Leroy Country Club 200 10 -
Kamp Komfort 200 21 -
Indian Springs Recreation Assn 200 6 -
Freedom Oil Company (125666) 200 6 -
New Horizon Christian Church 200 0 -
Colonial Meadows Water Company 190 376 -
Anchor 160 61 -
Cooksville 157 389 -
Timber Pointe Oc-Sterns Lodge 150 30 -
Bloomington First Church 150 7 -
Meadows Mennonite Home 140 140 -
Timber Pointe - Pool 140 22 -

Compare beyond Illinois

Lower-flagged peers for McLean County

Cross-state counties nearest McLean County on flagged-system share (76.7%) and cumulative violation count (10,265). 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.