Beginning July 1, 2023, Stormwater Treatment Requirements Will Apply To Most Projects That Create and/or Replace 5,000 Square Feet or More of Impervious Surface
May 17, 2023
  • The following changes to stormwater treatment requirements take effect on July 1, 2023.  For more information, see fact sheet.

    • Stormwater treatment requirements will apply to most projects that create and/or replace 5,000 square feet or more of impervious surface.
    • Large single-family homes creating and/or replacing 10,000 square feet or more of impervious surface will now have treatment requirements. For more information, see fact sheet.
    • Public right-of-way areas in front of development projects that are part of the project must now be included in impervious surface calculations and runoff must be treated from those areas.
    • Road maintenance, reconstruction, and new road construction projects may be required to provide stormwater treatment depending on various project factors.
    • Criteria for Category C of the Special Projects provision is changing to support Affordable Housing projects.
    • Interceptor Tree Credits are no longer allowed - see the C.3 Regulated Projects Guide for guidance.