The New Hampshire Department of Environmental Services (DES) received funds in 2001 from the New Hampshire Estuaries Project (NHEP) to provide assistance to coastal communities to develop storm sewer infrastructure maps. DES created maps of outfall pipes in several towns and administered grants to coastal municipalities to map their storm drainage systems. This final report describes the outfall mapping project and the grant projects. Outfall maps were created for New Castle, Newington, Portsmouth, and parts of Durham and Madbury. Grant projects were completed in Exeter, Hampton, Newmarket, and Somersworth. Seabrook completed the first phase of a grant project. Durham and Rochester forfeited grants awarded to them because the work could not be completed by the project deadline. NHEP chose to fund stormwater infrastructure mapping projects for a number of reasons. Primarily, this grant was established in order to fulfill one of the water quality action plans identified in the NHEP Management Plan.