This document summarizes the §319 National Nonpoint Source Program, which provides funding to states to manage nonpoint source (NPS) pollution and support on-the-ground watershed projects. Key points include: 1) NPS pollution comes from various sources including agriculture, urban development, mining and forestry; 2) §319 allocates funds annually to states which they use to manage NPS programs and fund watershed projects; 3) §319 funds act as a catalyst, leveraging over $8 for every $1 of federal funds. Projects have restored over 725 waterbodies and improved water quality in thousands of miles of streams and acres of lakes/estuaries.