Stormwater is the water that flows through our neighborhoods on its way to area waterways. In St. Peters, we have two types of systems that carry this stormwater into nearby waterways. We have our "gray" systems; these are the gutters, storm sewer inlets, storm sewer pipes and related structures that the City of St. Peters maintains to allow stormwater to run from our surfaces to nearby waterways. Then, there are the "green" stormwater systems, the creeks, streams, and stormwater basins throughout our City.

In this section, learn how stormwater affects you, what you can do about it, and what the City of St. Peters is doing to manage and treat stormwater in our community. Plus, we have useful links concerning stormwater. For more information about stormwater, call City Hall at ext. 1225 at 636-477-6600 or 636-278-2244.

City of St. Peters Stormwater Master Plan

The Stormwater Master Plan (PDF) will be used for planning of future capital improvements, improving water quality, and continuing compliance with Missouri Department of Natural Resources Municipal Separate Storm Sewer Systems (MDNR MS4) regulations. Preliminary investigations have evaluated the existing conditions of the City's open-channel stormwater infrastructure based on hydrologic and hydraulic modeling, field reconnaissance, water quality modeling, and review of relevant policies at the City, State, and Federal levels.

• Stormwater Master Plan 2012 (PDF)
• Stormwater Master Plan with Appendices (PDF)
  • Nine Critical Element Plan for Spencer Creek Watershed (PDF)

City of St. Peters Stormwater Management

In St. Peters, we manage stormwater in our neighborhoods with thousands of storm drains that lead storm water through storm sewer pipes. The City of St. Peters also has a stormwater plan to help deal with erosion and other stormwater issues through regulations for developers and stormwater improvement projects. Proposition P Projects were funded by a half-cent sales tax approved by voters in order to address stormwater issues related to flooding, erosion, pollution and federal guidelines.

• General State Operating Permit for the City of St. Peters' Small Municipal Separate Storm Sewer System (MS4) (PDF)
• City of St. Peters Storm Water Management Plan 2017 (PDF) - If you would like to comment on this plan, please call 636-477-6600, ext. 1384, or email us your feedback.

Illicit Discharge Detection & Elimination Plan

The City of St. Peters is listed as a mandatory Municipal Separate Storm Sewer System (MS4) by the Missouri Department of Natural Resources and is required to design a stormwater management program to meet the requirements of its National Pollution Discharge Elimination System (NPDES) Phase II permit. Under the NPDES permit, the City of St. Peters must satisfy minimum control measures relating to illicit discharges to the MS4. The City of St. Peters Illicit Discharge Detection and Elimination (IDDE) plan satisfies the requirements of Minimum Control Measure 3C-1 of the City of St. Peters MS4 Stormwater Pollution Prevention Program. The purpose of the IDDE plan is to outline the procedures to detect and remove illicit discharges and improper disposal into the MS4 to the maximum extent practicable within the City's jurisdiction.