The vast majority of assessed water bodies across the United States are designated as impaired. Cities contribute to the problem with stormwater runoff from roads, buildings, sidewalks, and other impervious surfaces polluting our rivers, lakes and streams. Indeed, many localities are on the hook to meet a gamut of regulatory requirements, from MS4 permits to TMDLs in order to reduce polluted runoff. Innovative localities are turning to green infrastructure practices to reduce flooding, control erosion, and prevent polluted runoff from entering streams and other waterbodies.