National Municipal Separate Storm Sewer System (MS4) Needs Assessment Survey

This first-of-its-kind survey seeks to understand and quantify the challenges the regulated municipal stormwater community faces so resource solutions can be directed to fill these gaps. In mid-2018, the Water Environment Federation’s (WEF) Stormwater Institute (SWI) conducted a national survey of MS4 permittees. The primary objectives of this survey were to identify the information and technical resource needs of MS4 permittees and to better understand MS4 stormwater program challenges. Additionally, some of the information collected from the survey will support WEF’s ongoing effort to establish stormwater as a sector in the American Society of Civil Engineers (ASCE) Infrastructure Report Card ©.

MS4 Survey Fact Sheet

Survey Results – Executive Summary

Survey Results – Full Report

If you would like any additional information or have questions, please email Rebecca Arvin-Colon at