Dcsd, Treatment Plant 4
Wentzville, MO · St. Charles County · Publicly Owned Treatment Works
- Average flow
- 0.51 MGD
- Design flow
- —
- NPDES permit
- MO0136425
- Effective
- Permit expires
- June 2030
- Population served
- —
- CWNS 2022
Dcsd, Treatment Plant 4 is a publicly owned wastewater treatment works in Wentzville, St. Charles County, Missouri treating an average of 0.51 million gallons per day. It discharges under NPDES permit MO0136425 (effective), which expires in June 2030, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Wentzville
Wentzville's capital improvement plan lists 57 water, sewer and wastewater line items worth $54M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Wentzville →
| Project | Budget | Years |
|---|---|---|
| Waterline Extensions and Replacement | $13,450,000 | 2025–2028 |
| Deep Aquifer Water Well and Storage | $12,000,000 | 2025–2026 |
| New Water Storage Tank with Water Main Improvements | $9,000,000 | 2025–2026 |
| 2-MG GM Ground Storage Tank Coating Interior and Booster Pump Rebuild | $3,400,000 | 2025–2026 |
| Bypass Trunk Relief | $2,300,000 | 2025–2026 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at Dcsd, Treatment Plant 4.
No verified contacts on file yet
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Nearby wastewater treatment plants in Missouri
New Melle · 3 mi away
0.0039 MGD
Wentzville · 3 mi away
0.03 MGD
New Melle · 3 mi away
0.0083 MGD
Wentzville · 4 mi away
0.0093 MGD
St. Charles · 7 mi away
0.0094 MGD
Foristell · 8 mi away
0.01 MGD
Wentzville · 8 mi away
4.34 MGD
Weldon Spring · 9 mi away
4.28 MGD
Dcsd, Treatment Plant 4: 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 July 28, 2025.