PlainWater

Douglas County, Illinois

SDWIS compliance plate

Sheet IL041 · Douglas County 16 sys · 574 viol · #1841/3254

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

  • VIOL-SEVERE 81.3% flagged
  • HEALTH-LOW 11.7% health
  • RANK-MID #1841/3254
  • PHOTO-FINISH ±0.0 pp
  • PFAS-CLEAN 0.0% detect
  • SRC-GW GW lead 94%
  • SYS-SMALL 16 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: Effingham County (+ 0 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Douglas County ranks #1,841 of 3,254 counties by people served, and #60 of 102 counties in Illinois. See methodology · corpus placement.

Douglas County standing, lower-flagged corpus third

Flagged-system rate 81.3% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 11.7% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 0.0% is UCMR5 detect rate at or below the tested-pool lower third (≤ 0.0%) . Population served ranks #1,841 of 3,254 · #60 of 102 in Illinois.

Flagged-rate neighbourhood around Douglas County

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

0% 20% 40% 60% 80% 100% Sangamon · lowest Livingston · near Effingham · near Pulaski · highest 58.8% 81.1% 81.1% 81.3% 81.3% 81.5% 100%

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

Water Systems

Compare beyond Illinois

Lower-flagged peers for Douglas County

Cross-state counties nearest Douglas County on flagged-system share (81.3%) and cumulative violation count (574). 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
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.