St Charles Missouri River WWTP
2500 North Main Street, St. Charles, MO 63301 · St Charles County · Publicly Owned Treatment Works
- Average flow
- 4.2 MGD
- Design flow
- —
- NPDES permit
- MO0058351
- Administratively continued
- Permit expires
- September 2025
- Population served
- 70,650
- CWNS 2022
St Charles Missouri River WWTP is a publicly owned wastewater treatment works in St. Charles, St Charles County, Missouri treating an average of 4.2 million gallons per day, serving about 70,650 residents. It discharges under NPDES permit MO0058351 (administratively continued), which expires in September 2025, with 0 recorded violations in the last three years.
Treatment technology
6 treatment structures and unit processes identified at St Charles Missouri River WWTP.
Available with a free Klarifi account
See the full treatment train at St Charles Missouri River WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
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 Missouri River WWTP.
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Nearby wastewater treatment plants in Missouri
St. Charles · 5 mi away
—
Saint Charles · 7 mi away
4.45 MGD
Saint Peters · 8 mi away
5.65 MGD
Portage Des Sioux · 11 mi away
—
Florissant · 11 mi away
22.75 MGD
O'Fallon · 13 mi away
7.55 MGD
Weldon Spring · 14 mi away
4.93 MGD
St. Charles · 15 mi away
0.0087 MGD
St Charles Missouri River WWTP: 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 October 26, 2026; facility record last updated September 26, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · FOG · Equalization tank · all terms