Stormwater Management

Urbanization can increase the quantity and decrease the quality of runoff. Historically, cities have focused stormwater management programs on reducing the effects of flooding. In recent years, however, the focus has shifted to also include water quality degradation. Stormwater management benefits  property owners by reducing property damage and increasing the quality of receiving streams.

The City's has a "Municipal Separate Storm Sewer System" (MS4), meaning that it is separate from the sanitary sewer system. A variety of natural and artificial structures and land forms are considered part of the MS4: inlets, pipes, grass and concrete channels, culverts, ditches, and detention basins. To reduce flooding and safety issues, stormwater travels through the storm system and into nearby streams, rivers and lakes.

Drainage on Your Property
Infrastructure Map
Stormwater Improvement Projects
Have a Concern?

Property owners often wonder how to best manage drainage, if infrastructure is blocked, or why there’s water in the street or yard swales. The City offers a variety of resources and technical assistance for yard drainage. 

Learn more

Stormwater Management Plan

The City of Wentzville is regulated under the federal Clean Water Act and Missouri Clean Water Law for stormwater discharges. Since 2003, the City has implemented a Stormwater Management Plan for permit compliance to reduce pollutants from being carried by runoff into local water bodies from the municipal separate storm sewer system (MS4).

2016-2021 Stormwater Management Plan (SWMP) 
2017-2018 MS4 Permit SWMP Report
2018 Audit Report

Learn more about the City's SWMP for pollution prevention.  

Collectively, there are more than 300 stormwater facilities in Wentzville that help manage over 13 billion gallons of rainfall received, providing flood protection and improving water quality in accordance with state and federal laws. 

Help clean up the Peruque and Dry Branch watersheds! These streams are essential to the health of our community and support a variety of wildlife and land uses. Volunteers, ages 6 and up can register for M:CS as a family, individual or organization.

We need your help at the annual clean-up to take care of this valuable natural resource in our community. The event may be adjusted to accommodate for social distancing precautions.

Get updated event information here including COVID-19 related updates. Pre-registration opens in January.  

Stay tuned for more details and updates!  

McCoy Creek, and it's Dry Branch tributary creek is being listed as a success story in the Missouri Department of Natural Resources FY19 Annual Report, as well as on EPA's website. It highlights planning and partnership efforts across the City of Wentzville, including past grants and wastewater treatment plant upgrades that improve the health of our water resource:

Nonpoint Source Success Story - McCoy Creek

Get involved in your community while helping monitor and improve the local water quality! 

Why Monitor Streams?
Clean, safe, usable water is essential to all life. Point sources and nonpoint sources of pollution—urban run-off that flows into storm drains from commercial practices as well as housekeeping practices—can negatively impact water quality downstream.

Protecting and ensuring the health of our streams and watersheds is everyone’s responsibility. It takes a collaborative network of dedicated and educated citizens all working together to understand and raise awareness about water issues, prevent water pollution, and improve water quality.

How do I become a water quality monitor?
The first step is to sign up for one of our Introductory workshops. Space is limited for these training classes, so register early!
Local Locations Dates:

*Please note there are more training dates and locations than shown above. 

Workshop Dates & Registration

Click here for more information on the program. 

Wentzville was awarded $748,015 from Region VII, US EPA, through Missouri Department of Natural Resources under Section 319 of the Clean Water Act.  The project addresses nonpoint source pollution by identifying pollutants, and prioritizing and constructing solutions for our community. The Dry Branch Watershed includes areas predominantly north of I-70 that drain to McCoy Creek.  Learn more.

Get inspired on your own property or common grounds!  Check out these local projects make use of important water resources and even help resolve nuisances and maintenance issues.