Williamson County, Illinois
SDWIS compliance plate
Sheet IL199 · Williamson County 26 sys · 1,069 viol · #697/3254
VIOL-SEVERE · HEALTH-LOW · RANK-UPPER · PHOTO-FINISH · PFAS-HIGH · SRC-SW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 96.2% flagged
- HEALTH-LOW 17.4% health
- RANK-UPPER #697/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-HIGH 71.4% detect
- SRC-SW SW lead 96%
- SYS-SMALL 26 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Mason County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Williamson County ranks #697 of 3,254 counties by people served, and #21 of 102 counties in Illinois. See methodology · corpus placement.
Williamson County standing, mid-flagged corpus third
Flagged-system rate 96.2% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 17.4% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 71.4% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #697 of 3,254 · #21 of 102 in Illinois.
Flagged-rate neighbourhood around Williamson County
Lowest/highest poles plus in-state counties nearest Williamson County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| Marion | 16,855 | 136 | Detected |
| Herrin | 12,747 | 19 | Detected |
| Lake of Egypt Pwd | 11,368 | 172 | Clean |
| Carterville | 6,484 | 29 | Detected |
| Coal Valley Pwd | 3,960 | 23 | Clean |
| Corinth Pwd | 3,927 | 16 | Detected |
| Johnston City | 3,509 | 20 | Detected |
| Pittsburg | 2,948 | 45 | - |
| Cambria | 1,727 | 18 | - |
| Crainville | 1,711 | 57 | - |
| Fci-Marion | 1,544 | 57 | - |
| Devils Kitchen Water District | 1,428 | 52 | - |
| Ferges Water District | 1,185 | 15 | - |
| Highway 37 North Pwd | 1,065 | 34 | - |
| Energy | 984 | 5 | - |
| Blairsville Pwd | 807 | 31 | - |
| Hurst | 782 | 68 | - |
| Creal Springs | 683 | 26 | - |
| Colp | 506 | 54 | - |
| Freeman Spur | 373 | 39 | - |
| Bush | 285 | 35 | - |
| The Orchards Mhc | 253 | 10 | - |
| Marion Mobile Home Village | 220 | 0 | - |
| Crab Orchard Refuge | 25 | 99 | - |
| Walmart Supercenter #0216 | 25 | 4 | - |
| Lj Ice Company | 25 | 5 | - |
Compare beyond Illinois
Mid-flagged peers for Williamson County
Cross-state counties nearest Williamson County on flagged-system share (96.2%) and cumulative violation count (1,069). 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.