The LID Center produced a guide to using readily available online mapping platforms to obtain property and environmental information for planning and discussion purposes. This guide is intended for municipal staff and officials in Prince George’s County, Maryland. It focuses on PG Atlas and the DoE Clean Water Map. PG Atlas is a web mapping application created and maintained by the Maryland-National Capital Park & Planning Commission, Prince George’s County Planning Department, and displays planning, development, environmental and other countywide geographic data. The Clean Water Map is a web mapping application created and maintained by the Prince George’s County Department of the Environment that allows users to view stormwater management projects and other water quality-related information. This guide was developed under a grant from the National Fish and Wildlife Foundation under the Chesapeake Bay Stewardship Fund program.