Environmental Planning

Water Quality

Draft MS4 Permit

Earlier this year, the Arizona Department of Environmental Quality announced issuance of the ADOT Municipal Separate Storm Sewer System Permit (MS4 Permit) and held a public comment period. The draft permit and associated fact sheet, as well as ADOT's comments, are provided. At such time that the MS4 Permit is issued, this page will be updated and all information associated with the Statewide Stormwater Discharge Permit will be archived.

Statewide Stormwater Discharge Permit

The statewide stormwater discharge permit was set to expire Sept. 18, 2013. However, the statewide stormwater discharge permit has been administratively continued and remains valid until a new permit is issued in 2014. The statewide stormwater discharge permit provides authorization to discharge stormwater under the Arizona Pollutant Discharge Elimination System (AZPDES) program. ADOT is authorized to discharge stormwater and other discharges specified in this permit from activities associated with the municipal separate storm sewer system (MS4) operated by ADOT, activities associated with construction that are initiated and controlled by ADOT during the permit term, and facilities associated with industrial and maintenance activities owned and operated by ADOT.

Statewide Stormwater Management Plan (SSWMP)

This 136-page plan describes ADOT's program to reduce the discharge of pollutants associated with the stormwater drainage systems that serve highways and transportation-related properties, facilities and activities. This plan identifies how ADOT complies with the provisions of their Arizona Pollutant Discharge Elimination System (AZPDES) Individual Statewide Stormwater Permit.

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.