Dcsd, Riverdale Subdivision WWTF
O'Fallon, MO · Saint Charles County · Publicly Owned Treatment Works
- Average flow
- 0.1 MGD
- Design flow
- —
- NPDES permit
- MO0132152
- Effective
- Permit expires
- March 2031
- Population served
- 1,600
- CWNS 2022
Dcsd, Riverdale Subdivision WWTF is a publicly owned wastewater treatment works in O'Fallon, Saint Charles County, Missouri treating an average of 0.1 million gallons per day, serving about 1,600 residents. Treatment on site includes lagoon, aerobic, screening. It discharges under NPDES permit MO0132152 (effective), which expires in March 2031, with 3 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
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 Dcsd, Riverdale Subdivision WWTF.
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Nearby wastewater treatment plants in Missouri
Old Monroe · 3 mi away
0.05 MGD
Old Monroe · 4 mi away
—
O'Fallon · 4 mi away
6.7 MGD
Wentzville · 7 mi away
4.34 MGD
Winfield · 8 mi away
0.58 MGD
Moscow Mills · 8 mi away
0.002 MGD
Saint Peters · 9 mi away
4.83 MGD
Moscow Mills · 10 mi away
0.25 MGD
Dcsd, Riverdale Subdivision 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 14, 2024.