Why do I need coverage under the Small Municipal Separate Storm Sewer System (MS4) General Permit?

This permit is for certain public entities that operate municipal separate storm sewer systems (MS4s). The permit authorizes the discharge of stormwater to Waters of the U.S. from Small MS4s, which may include:

  • A city, town or county located fully or partially within an urbanized area as determined by the latest Decennial Census by the Bureau of Census
  • State, federal and other publicly-owned properties that discharge stormwater
  • Other areas designated by ADEQ.

The permit requires the development of a stormwater management program. The permittees are required to follow six minimum control measures that must be built into their program including:

  • Public Education and Outreach
  • Public Involvement and Participation
  • Illicit Discharge Detection and Elimination (IDDE) Program
  • Construction Site Stormwater Runoff Control
  • Post-Construction Stormwater Management
  • Pollution Prevention and Good Housekeeping.

Coverage under the general permit is valid during the five-year term of the permit. Permittees must pay an annual fee.

Small Municipal Separate Storm Sewer System (MS4) Permit | View Permit >

Submit a Notice of Intent (NOI), Annual Report and Discharge Monitoring Report (DMR)

To obtain an NOI and submit an annual report or DMR, you will need to use myDEQ, ADEQ's online portal. Get an account or log in to myDEQ at your convenience 24/7 | Register Today > | Log In to myDEQ >

Submitting an Annual Report in myDEQ | View User Guide >
Submitting a DMR in myDEQ | View User Guide >