St Peters Pws
Saint Peters, MO · St Charles County · Publicly Owned Treatment Works
- Average flow
- 4.83 MGD
- Design flow
- —
- NPDES permit
- MO0030970
- Effective
- Permit expires
- December 2024
- Population served
- 57,536
- CWNS 2022
St Peters Pws is a publicly owned wastewater treatment plant in Saint Peters, St Charles County, Missouri treating an average of 4.83 million gallons per day, serving about 57,536 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches, biogas silos, biological treatment, other, biosolids aerobic digestion and other unit processes. It discharges under NPDES permit MO0030970 (effective), which expires in December 2024, with 0 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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Biogas silos
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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
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for St Peters Pws, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at St Peters Pws, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Missouri
O'Fallon · 5 mi away
6.7 MGD
Saint Charles · 6 mi away
4.04 MGD
St. Charles · 7 mi away
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St. Charles · 8 mi away
3.73 MGD
Weldon Spring · 9 mi away
4.28 MGD
St. Charles · 9 mi away
0.0094 MGD
O'Fallon · 9 mi away
0.1 MGD
Old Monroe · 11 mi away
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St Peters Pws: 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 February 27, 2025.