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Counties → Illinois

Sangamon County, Illinois

SDWIS compliance plate

Sheet IL167 · Sangamon County 68 sys · 1,245 viol · #358/3254

VIOL-SEVERE · HEALTH-MID · RANK-TOP · BELOW-PEER · PFAS-LOW · SRC-SW · SYS-MID · BOOK-FULL

  • VIOL-SEVERE 58.8% flagged
  • HEALTH-MID 27.6% health
  • RANK-TOP #358/3254
  • BELOW-PEER 1.6 pp cleaner
  • PFAS-LOW 14.3% detect
  • SRC-SW SW lead 68%
  • SYS-MID 68 systems
  • BOOK-FULL 7/7 fields

Nearest flagged-rate peer: DuPage County (+ 1.6 pp flagged-rate)

According to EPA SDWIS county population served used on /counties, Sangamon County ranks #358 of 3,254 counties by people served, and #12 of 102 counties in Illinois. See methodology · corpus placement.

Sangamon County standing, lower-flagged corpus third

Flagged-system rate 58.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 27.6% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 14.3% is UCMR5 detect rate in the tested-pool middle third (≤ 33.3%) . Population served ranks #358 of 3,254 · #12 of 102 in Illinois.

Flagged-rate neighbourhood around Sangamon County

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

0% 20% 40% 60% 80% 100% Sangamon · this county · lowest Monroe · near 58.8% 60.4% 61.1% 64.7% 68.8% 100%

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

Water Systems

System Name Population Violations PFAS
Springfield 117,444 23 Detected
Chatham 16,423 39 Clean
Curran-Gardner Township Pwd 6,651 12 Clean
Williamsville 6,198 8 Clean
Auburn 4,574 51 Clean
Riverton 4,279 62 Clean
Rochester 3,856 46 Clean
Pawnee 2,739 36 -
Dawson 2,375 58 -
Jerome 1,600 52 -
Pleasant Plains 1,508 18 -
Grandview 1,405 26 -
New Berlin 1,380 241 -
Divernon 1,172 50 -
Mechanicsburg-Buffalo Water Commission 1,170 80 -
Illiopolis 1,037 68 -
Ej Water-Sangchris 1,025 43 -
Grand Valley Village MHP 912 34 -
Round Prairie Water Coop 813 6 -
Loami 812 27 -
Sugar Crk Pwd 754 20 -
Thayer 721 93 -
Woodland Acres MHP 464 8 -
Oakwood Estates 420 9 -
Cottonwood Cove MHP 358 0 -
Forrest Park MHP 352 0 -
Pheasant Run MHP 350 10 -
Bissell Village Mhc 220 8 -
Northbrook Mhc 220 4 -
Church of the Nazarene (142588) 200 4 -
Deerwood Estates 176 0 -
Milton Manor MHP 154 0 -
Westwood Place 152 0 -
Gaslite Court Mhc 148 0 -
South Sangamon Water Commission 134 27 -
Ridge Village MHP 120 1 -
Park Ridge Mhc 116 17 -
Scottsdale Mhc 114 0 -
Sangchris State Park Office (10066) 100 5 -
The Gym of Springfield 100 0 -
Edgewood Mobile Home Court (Mhc) 92 5 -
Linden Manor MHP 84 0 -
Patch Place Mhc 47 4 -
Westwood 44 0 -
Kents Iga Riverton 40 0 -
United Regional Water Coop 25 8 -
Springfield KOA Kampground Inc 25 25 -
Carwash City 25 5 -
Meijer Springfield 25 0 -
Schnuck Sangamon Springfield 25 0 -

Compare beyond Illinois

Lower-flagged peers for Sangamon County

Cross-state counties nearest Sangamon County on flagged-system share (58.8%) and cumulative violation count (1,245). 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.