Wentzville Pws
2355 Mette Road, Wentzville, MO 63385 · St Charles County · Publicly Owned Treatment Works
- Average flow
- 4.64 MGD
- Design flow
- —
- NPDES permit
- MO0093599
- Administratively continued
- Permit expires
- March 2024
- Population served
- 41,342
- CWNS 2022
Wentzville Pws is a publicly owned wastewater treatment plant in Wentzville, St Charles County, Missouri treating an average of 4.64 million gallons per day, serving about 41,342 residents. It discharges under NPDES permit MO0093599 (administratively continued), which expires in March 2024, with 4 recorded violations in the last three years. EPA has recorded 3 formal enforcement actions naming the plant, the latest in November 2019.
Treatment technology
5 treatment structures and unit processes identified at Wentzville Pws.
Available with a free Klarifi account
See the full treatment train at Wentzville Pws: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 4
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Wentzville Pws in EPA's ICIS system.
- Formal actions
- 3
- 0 since FY2020
- Penalties assessed
- $7,700
- all cases
- EPA inspections
- 0
- none on record
Latest case · Nov 2019
CITY OF WENTZVILLE
Administrative order · CWA, Sewage Sludge Disposal · Final Order With Penalty · Penalty $7,700
Source: EPA ECHO, civil enforcement case 07-2019-0240.
Full case history with a free Klarifi account
Every action against Wentzville Pws with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
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
2 verified contacts for Wentzville Pws, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Wentzville Pws, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Missouri
Moscow Mills · 5 mi away
0.31 MGD
Wentzville · 5 mi away
0.01 MGD
Foristell · 6 mi away
0.01 MGD
Wentzville · 6 mi away
0.02 MGD
O'Fallon · 7 mi away
0.13 MGD
Old Monroe · 7 mi away
0.04 MGD
Moscow Mills · 8 mi away
0.0037 MGD
Troy · 8 mi away
1.44 MGD
Wentzville 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 October 12, 2026; facility record last updated August 3, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Lift station · Sludge dewatering · all terms