Stormwater Maps and GIS Resources
The Division maintains an interactive web-based map to help the public determine whether development activities are subject to the post-construction permitting program or other stormwater permitting requirements. Please read the information about using the results of this map viewer. While we do our best to make the map as accurate as possible, this viewer is simply a tool to help you in making your final determination about your responsibilities for permit coverage.
Boundary updates, including 2010 Census Urbanized Areas, were posted to the Map Viewer on February 4, 2013. Revisions to MSIs with 2010 Census population will follow at a later date.
HQW, ORW, and WS Reclassifications
There may bewaterbodies that have either recently been reclassified as HQW, ORW, or Water Supply, or are pending reclassificaiton. These areas are not reflected in the current interactive map. Those watersheds may now be subject to local or State Stormwater Program requirements. Be sure to check with the Classification and Standards Unit website for updates.
♦ See a list of all Proposed Reclassifications
♦ SW Permitting Reference GIS layer for Map Viewer: updated layer posted February 4, 2013. For additional information, contact Bethany Georgoulias