Stormwater Discharge Permit

MS4 Permit

The Arizona Department of Environmental Quality issued the ADOT Municipal Separate Storm Sewer System (MS4 Permit) on June 24, 2021, with an effective date of July 1, 2021. This permit expires on June 30, 2026.

• MS4 Permit
• Fact Sheet

ADOT MS4 Stormwater Management Plan (SWMP)

Permit Annual Reports

These reports discuss components of the SSWMP implemented by ADOT, proposed changes to the SSWMP, summary of data collected throughout the reporting year, annual expenditures, enforcement actions, inspections, public education programs, and water quality improvements or degradation.

2020 Annual Report

Stormwater Management Plan Annual Report - 2020

• Appendix A: Mapping
• Appendix B: Dry Weather Screening
• Appendix C: Construction Inventory
• Appendix D: PCWQC Inventory
• Appendix E: Erosion Projects
• Appendix F: Facility Inventory
• Appendix G: Sampling Event Data and Reports