Jefferson County, Illinois
SDWIS compliance plate
Sheet IL081 · Jefferson County 16 sys · 279 viol · #1252/3254
VIOL-SEVERE · HEALTH-LOW · RANK-UPPER · PHOTO-FINISH · PFAS-HIGH · SRC-SW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 68.8% flagged
- HEALTH-LOW 4.3% health
- RANK-UPPER #1252/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-HIGH 100.0% detect
- SRC-SW SW lead 94%
- SYS-SMALL 16 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Ford County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Jefferson County ranks #1,252 of 3,254 counties by people served, and #41 of 102 counties in Illinois. See methodology · corpus placement.
Jefferson County standing, lower-flagged corpus third
Flagged-system rate 68.8% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 4.3% is health-based share at or below the lower third (≤ 10.3%) . UCMR5 detect rate 100.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #1,252 of 3,254 · #41 of 102 in Illinois.
Flagged-rate neighbourhood around Jefferson County
Lowest/highest poles plus in-state counties nearest Jefferson County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Mount Vernon | 15,793 | 39 | Detected |
| Northeast Mount Vernon Water Company | 5,483 | 23 | Detected |
| Woodlawn | 3,587 | 31 | Detected |
| Dix-Kell Water Commssion | 1,972 | 22 | - |
| Belle Rive | 1,930 | 36 | - |
| Waltonville | 1,901 | 21 | - |
| Bluford | 1,880 | 58 | - |
| Bonnie | 437 | 22 | - |
| Oak Grove Village | 362 | 1 | - |
| Rolling Meadows Mhc (Jefferson Co) | 218 | 0 | - |
| Moores Prairie Township Water Company | 213 | 0 | - |
| Nason | 207 | 22 | - |
| Wal-Mart Supercenter 0224 | 25 | 0 | - |
| Icehouse South Mt Vernon | 25 | 0 | - |
| Icehouse Main Mt Vernon | 25 | 0 | - |
| Lucky Ice USA LLC - Mt Vernon | 25 | 4 | - |
Compare beyond Illinois
Lower-flagged peers for Jefferson County
Cross-state counties nearest Jefferson County on flagged-system share (68.8%) and cumulative violation count (279). 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.