St Charles-Mississippi River WWTF
St. Charles, MO · St. Charles County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- MO0058343
- Administratively continued
- Permit expires
- June 2025
- Population served
- 70,650
- CWNS 2022
St Charles-Mississippi River WWTF is a publicly owned wastewater treatment works in St. Charles, St. Charles County, Missouri, serving about 70,650 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches, biological treatment, other, biosolids aerobic digestion, disinfection, uv and other unit processes. It discharges under NPDES permit MO0058343 (administratively continued), which expires in June 2025, with 3 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Carrousels / oxidation ditches
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Biological Treatment, Other
unit processBiosolids Aerobic Digestion
unit processDisinfection, UV
unit processScreening
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at St Charles-Mississippi River WWTF.
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Nearby wastewater treatment plants in Missouri
St. Charles · 5 mi away
3.73 MGD
Saint Peters · 7 mi away
4.83 MGD
Portage Des Sioux · 10 mi away
—
O'Fallon · 10 mi away
6.7 MGD
Saint Charles · 11 mi away
4.04 MGD
O'Fallon · 12 mi away
0.1 MGD
Old Monroe · 12 mi away
—
Florissant · 14 mi away
14.3 MGD
St Charles-Mississippi River WWTF: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated August 7, 2026.