St. Charles County, Missouri
SDWIS compliance plate
Sheet MO183 · St. Charles County 54 sys · 2,706 viol · #223/3254
VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-MID · BOOK-FULL
- VIOL-SEVERE 90.7% flagged
- HEALTH-MID 24.0% health
- RANK-TOP #223/3254
- PHOTO-FINISH ±0.2 pp
- PFAS-HIGH 60.0% detect
- SRC-GW GW lead 93%
- SYS-MID 54 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Miller County ( -0.2 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, St. Charles County ranks #223 of 3,254 counties by people served, and #4 of 115 counties in Missouri. See methodology · corpus placement.
St. Charles County standing, lower-flagged corpus third
Flagged-system rate 90.7% is at or below the corpus lower third (≤ 92.7% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 24.0% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 60.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #223 of 3,254 · #4 of 115 in Missouri.
Flagged-rate neighbourhood around St. Charles County
Lowest/highest poles plus in-state counties nearest St. Charles County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
Compare beyond Missouri
Lower-flagged peers for St. Charles County
Cross-state counties nearest St. Charles County on flagged-system share (90.7%) and cumulative violation count (2,706). 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.