Stormwater Post-Construction Program
Post-construction stormwater controls are used to limit surface runoff and reduce pollutant loadings and include features such as retention/detention basins, drywells, green stormwater infrastructure, and stormwater pretreatment devices.
While these devices are not new to development projects, new post-construction requirements in the City of Phoenix's Phase I Municipal Separate Storm Sewer System (MS4) permit were added by the Arizona Department of Environmental Quality. Effective July 1, 2022, the City of Phoenix has started implementation of a program to inventory, track, inspect, and confirm adequate maintenance of post-construction stormwater controls for public and private projects of one acre or more.
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