County profile · EPA SDWIS + UCMR5
Knox County, Illinois
45 SDWIS-listed public water systems serve 49,636 people in Knox County. Violation rates use that full inventory; PFAS rates use only the UCMR5-tested subset.
- 45
- SDWIS water systems Larger third of counties
- 2,317
- Total violations Middle third of counties
- 88.9%
- SDWIS systems w/ a violation Lower third of counties
- 66.7%
- UCMR5 PFAS rate (3 tested) Upper third of counties with tests
SDWIS compliance plate
Sheet IL095 · Knox County 45 sys · 2,317 viol · #962/3254
VIOL-SEVERE · HEALTH-MID · RANK-UPPER · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL
- VIOL-SEVERE 88.9% flagged
- HEALTH-MID 37.2% health
- RANK-UPPER #962/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-HIGH 66.7% detect
- SRC-GW GW lead 100%
- SYS-MID 45 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Marion County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, Knox County ranks #962 of 3,254 counties by people served, and #27 of 102 counties in Illinois. See methodology · corpus placement.
Knox 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 37.2% is health-based share above the upper third (> 24.5%) . UCMR5 detect rate 66.7% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #962 of 3,254 · #27 of 102 in Illinois.
Flagged-rate neighbourhood around Knox County
Lowest/highest poles plus in-state counties nearest Knox County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Illinois
Lower-flagged peers for Knox County
Cross-state counties nearest Knox County on flagged-system share (88.9%) and cumulative violation count (2,317). 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. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.