Portage Des Sioux WWTP
Portage Des Sioux, MO · Saint Charles County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- —
- NPDES permit
- MO0107328
- Effective
- Permit expires
- September 2024
- Population served
- 305
- CWNS 2022
Portage Des Sioux WWTP is a publicly owned wastewater treatment works in Portage Des Sioux, Saint Charles County, Missouri, serving about 305 residents. Treatment on site includes biological treatment, other, biosolids aerobic digestion, disinfection, uv, flow equalization, screening. It discharges under NPDES permit MO0107328 (effective), which expires in September 2024, with 18 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Biological Treatment, Other
unit processBiosolids Aerobic Digestion
unit processDisinfection, UV
unit processFlow Equalization
unit processScreening
unit processUnlock exact unit counts →
Compliance snapshot (last 3 years)
- Total violations
- 18
- 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 Portage Des Sioux WWTP.
No verified contacts on file yet
Klarifi verifies plant and municipal decision-makers continuously. Start a free trial to browse contacts at nearby plants and flag this one for verification.
Nearby wastewater treatment plants in Missouri
Florissant · 9 mi away
14.3 MGD
St. Charles · 10 mi away
—
St. Charles · 11 mi away
3.73 MGD
Saint Peters · 17 mi away
4.83 MGD
Saint Charles · 18 mi away
4.04 MGD
St. Louis · 19 mi away
90.1 MGD
O'Fallon · 20 mi away
6.7 MGD
Old Monroe · 21 mi away
—
Portage Des Sioux 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 September 11, 2026; facility record last updated May 3, 2025.