Environmental permitting is required for a variety of public works projects—from everyday operations and maintenance to new construction. This toolbox provides general information on the different types of permits that may be required including National Pollutant Discharge Elimination System (NPDES) Municipal Storm Sewer System (MS4) permits, NPDES Construction General permits, and Clean Water Act Section 401 Certification and Section 404 permits, Endangered Species Act (ESA) consultation, and Section 106 consultation. This toolbox is not intended to be all-inclusive of permitting processes. Rather, it provides an initial framework public works staff can refer to when presented with project opportunities and challenges.