St. Louis County, Missouri
SDWIS compliance plate
Sheet MO189 · St. Louis County 23 sys · 1,825 viol · #45/3254
VIOL-SEVERE · HEALTH-MID · RANK-TOP · PHOTO-FINISH · PFAS-HIGH · SRC-GW · SYS-SMALL · BOOK-FULL
- VIOL-SEVERE 95.7% flagged
- HEALTH-MID 20.0% health
- RANK-TOP #45/3254
- PHOTO-FINISH ±0.0 pp
- PFAS-HIGH 50.0% detect
- SRC-GW GW lead 87%
- SYS-SMALL 23 systems
- BOOK-FULL 7/7 fields
Nearest flagged-rate peer: Iron County (+ 0 pp flagged-rate)
According to EPA SDWIS county population served used on /counties, St. Louis County ranks #45 of 3,254 counties by people served, and #1 of 115 counties in Missouri. See methodology · corpus placement.
St. Louis County standing, mid-flagged corpus third
Flagged-system rate 95.7% is in the corpus middle third (≤ 100.0% flagged) across 2,973 counties with ≥3 SDWIS systems . Health-based share 20.0% is health-based share in the middle third (≤ 24.5%) . UCMR5 detect rate 50.0% is UCMR5 detect rate above the tested-pool upper third (> 33.3%) . Population served ranks #45 of 3,254 · #1 of 115 in Missouri.
Flagged-rate neighbourhood around St. Louis County
Lowest/highest poles plus in-state counties nearest St. Louis County on % of SDWIS systems with ≥1 violation. Full ladder: /counties.
Water Systems
| System Name | Population | Violations | PFAS |
|---|---|---|---|
| MO American St Louis St Charles Counties | 1,111,000 | 9 | Detected |
| Kirkwood PWS | 28,000 | 0 | Clean |
| Six Flags St Louis | 3,200 | 18 | - |
| MO Eastern Correctional Center | 1,100 | 28 | - |
| Rockwoods Reservation | 550 | 23 | - |
| Babler State Park | 500 | 37 | - |
| MO American Pevely Farms | 343 | 25 | - |
| Terrisan | 240 | 5 | - |
| Greensfelder County Park | 100 | 58 | - |
| Crescent Farms Golf Club | 100 | 356 | - |
| Hidden Valley Golf and Ski | 100 | 23 | - |
| Wyman | 50 | 97 | - |
| Jay Henges Range | 50 | 101 | - |
| Paradise Valley Golf & Country Club | 50 | 156 | - |
| Holiday Inn at Six Flags | 30 | 67 | - |
| West Tyson County Park | 30 | 62 | - |
| Tyson Research Center | 26 | 59 | - |
| Alta Convenience 6524 | 25 | 259 | - |
| Lone Elk County Park | 25 | 50 | - |
| Aberdeen Golf Club | 25 | 104 | - |
| Jellystone Park Cmpgrd | 25 | 191 | - |
| Marianist Retreat Center | 25 | 53 | - |
| World Bird Sanctuary | 25 | 44 | - |
Compare beyond Missouri
Mid-flagged peers for St. Louis County
Cross-state counties nearest St. Louis County on flagged-system share (95.7%) and cumulative violation count (1,825). 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.