Clark County, Illinois
SDWIS compliance plate
Sheet IL023 · Clark County 9 sys · 552 viol · #1990/3254
VIOL-SEVERE · HEALTH-LOW · RANK-LOWER · PHOTO-FINISH · PFAS-CLEAN · SRC-GW · SYS-TINY · BOOK-FULL
- VIOL-SEVERE 88.9% flagged
- HEALTH-LOW 13.2% health
- RANK-LOWER #1990/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-CLEAN 0.0% detect
- SRC-GW GW lead 100%
- SYS-TINY 9 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Knox County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Clark County ranks #1,990 of 3,254 counties by people served, and #64 of 102 counties in Illinois. See methodology · corpus placement.
Clark County standing, lower-flagged corpus third
Flagged-system rate 88.9% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 13.2% 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 #1,990 of 3,254 · #64 of 102 in Illinois.
Flagged-rate neighbourhood around Clark County
Lowest/highest poles plus in-state counties nearest Clark County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Clark-Edgar RWD | 5,801 | 6 | Clean |
| Marshall | 3,947 | 58 | Clean |
| Casey | 3,274 | 109 | Clean |
| Martinsville | 1,200 | 57 | - |
| Westfield | 678 | 273 | - |
| Union-York Water District | 501 | 44 | - |
| Hydro Spray Car Wash | 25 | 4 | - |
| Walmart Marshall | 25 | 1 | - |
| Ice House Casey | 25 | 0 | - |
Compare beyond Illinois
Lower-flagged peers for Clark County
Cross-state counties nearest Clark County on flagged-system share (88.9%) and cumulative violation count (552). 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.
Similar violation load
Nearest cross-state counties by cumulative SDWIS violation count (all systems in the county).
Read our methodology · Check your water system - how this data is sourced, computed, and verified.
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.