In Arizona, water resources include surface waters, riparian areas, intermittent streams and ephemeral drainages. The Clean Water Act (CWA) of 1972 was established with the objective of restoring and preserving the chemical, physical, and biological integrity of the nation's waters by preventing point and nonpoint sources of pollution, providing assistance to publicly owned wastewater treatment plants, and maintaining the integrity of wetlands.
During the planning of a transportation project, EPG assesses the potential for water resources considered jurisdictional under Section 404 of the CWA to occur within or near the project area. As part of this determination, a jurisdictional delineation may be conducted to determine the exact boundary and types of water features (such as wetlands or drainages) present on a project site. Please refer to the ADOT Clean Water Act Section 404/401 Guidance Manual for more details.
EPG also assesses the potential for point source discharges of pollution, which is regulated under Section 402 of the CWA and permitted with Arizona or National Pollutant Discharge Elimination System Permits (AZPDES/NPDES).