The following is a selection of resources for those seeking more information on MS4-related mapping requirements.
MS4 Regulated Area
eMapPA - This DEP application can be used to view urbanized area (UA) based on the 2000 and 2010 censuses along with other facilities and features. The 2020 census designated UA will be added to eMap when it is released by EPA.
MS4 Requirements Table web-based GIS application - The MS4 GIS application provides a visual representation of the impairments that were required to be addressed in Pollutant Reduction Plans (PRPs) and TMDL Plans required during the 2018-2023 permit term, based on DEP’s 2014 Integrated Report.
PA Urbanized Areas and MS4 Municipalities (PDF) - This map of PA shows locations of urbanized areas (2010), county boundaries, major watersheds, and MS4 municipalities with general and individual NPDES permit coverage and waivers.
Storm Sewershed Mapping
Model Map (PDF) - An example map developed by DEP that illustrates the detail necessary to meet the basic requirements of MCM #3 as well as the advanced requirements for PRPs, TMDL Plans and Pollutant Control Measures for the current NPDES permit term. DEP has posted
instructions (PDF) on how to use the Model Map.