Stormwater Management
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Pollution Prevention

Wentzville's Stormwater Management Program
In 1999 the City became regulated under Phase II of the Clean Water Act to improve water quality and protect rivers, streams, and drinking water resources.  The City operates the municipal separate storm sewer system (MS4)  permited by the Dept. of Natural Resources.  For permit compliance, the City implements a Stormwater Management Plan (SWMP) to reduce pollutants from being carried by runoff into local waterbodies. 

       2013-2018 Stormwater Management Plan (SWMP)
       2017 MS4 Permit SWMP Report

The SWMP must address six minimum control measures:

 I.  Public Education and Outreach - Distribute materials and conduct outreach about the impacts of stormwater discharges on waterbodies and the steps the public can take to reduce pollutants.
 II.  Public Involvement and Participation - Actively involve the public in the development and implementation of the plan to reduce pollution through community groups and activities.
 III.  Illicit Discharge Detection and Elimination Detect and eliminate illegal discharges and dumping into storm drains and streams. We maintain a map of streams, inventory and inspect storm drains.
 IV.  Construction Site Storm Water Runoff Control Implement and enforce a program requiring Best Management Practices (BMPs) to reduce pollutants from construction activities. BMPs focus on erosion and sediment control and construction waste. 
 V. Post-Construction Storm Water Management Ensure that structural and non-structural BMPs are in place to prevent or minimize long-term water quality impacts from new and redevelopment projects.  BMPs include stormwater ponds, filtering and infiltration practices, credits to encourage low-impact development and more.
 VI. Pollution Prevention for Municipal Operations Implement an operation and maintenance program and training to prevent or reduce pollutants in runoff from municipal operations.

Environmental Compliance 
Wentzville works with property owners, businesses and other stakeholders to increase awareness of stormwater issues. Here are some tools our community uses to help prevent stormwater pollution:

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