Why do I need an AZPDES Industrial Stormwater Multi-Sector General Permit (MSGP)?

Industrial stormwater permitting is an important part of the Clean Water Act to ensure surface water protection by requiring certain industrial activities to obtain permit coverage to discharge stormwater (to waters of the U.S., or WOTUS). Unlike wastewater that is treated before being discharged to WOTUS, stormwater does not get treated.  The stormwater program relies on best management practices to minimize pollutants in stormwater discharges. ADEQ issues the industrial stormwater MSGP in Arizona.  The MSGP identifies 29 different sectors that are subject to permitting for industrial stormwater discharges to WOTUS | View Sector List >

A facility must have permit coverage if an industrial activity falls within one of the sectors and will discharge stormwater to a WOTUS. If industrial stormwater will not discharge to WOTUS, either directly or by way of a conveyance (such as a street, ditch, etc.), stormwater permit coverage is not required | Learn More by Visiting the No Discharge Certificate FAQs Page >

If a facility would otherwise be regulated by the MSGP, but are exempt from the requirement to obtain a permit because there is no exposure of industrial materials or activities to precipitation or runoff because the industrial materials and activities at the site are covered by a storm-resistant shelter, you may apply for a No Exposure Certification | Learn More by Visiting the No Exposure Certificate FAQs Page >

2019 MSGPs

The 2019 MSGPs replace ADEQ’s 2010 Non-Mining and Mining MSGPs in accordance with the following schedule:

  • 2019 MSGPs issued May 15, 2019.
  • 2019 MSGPs became effective on Jan. 1, 2020.
  • Existing permittees (those who have coverage under the 2010 permit(s)) have between Jan. 1, 2020, and Feb. 28, 2020, to submit a Notice of Intent (NOI) using myDEQ.
  • A Stormwater Pollution Prevention Plan (SWPPP) must be developed by the time the NOI is submitted. Existing permittees are encouraged to update their current SWPPP to comply with the 2019 MSGP requirements, rather than developing a new SWPPP.
  • Prior to Jan. 1, 2020, the following process applies:
    • Existing permittees must continue to comply with their coverage under 2010 MSGP (e.g., monitoring, reporting, inspections, etc.).
    • New and unpermitted facilities that are subject to industrial stormwater permitting must apply under 2010 MSGP for stormwater discharges, as required by the Clean Water Act, and federal and state law.

2019 Industrial Stormwater MSGP

2019 Mining MSGP

2019 Administrative Record and Response to Comments | View >

The 2010 MSGP expired on Dec. 31, 2019. The 2010 MSGP is replaced with the 2019 MSGP that is effective as of Jan. 1, 2020. 

View 2010 MSGP permit and reference materials | View >

Submitting Online NOIs for MSGP Coverage

To obtain, modify or terminate an NOI for an MSGP you will need to use myDEQ | Learn More > 

A SWPPP is required to be completed prior to submitting an NOI | SWPPP Template >

Compliance Assistance

To help permittees stay in compliance with the 2019 MSGP, ADEQ has various report templates and forms available for download | Learn More >


An initial fee is due at the time the operator submits a Notice of Intent (NOI) fee to ADEQ, and is based on the amount of acreage at the site:

  • Less than or equal to 1 acre | $350 *
  • Great than 1 acres and less than or equal to 40 acres  | $500 * 
  • Greater than 40 acres  | $1,000 *

Permittees must also pay an annual registration fee based on the acreage of their facility, and fees continue until the industrial activity ceases or the facility closes, at which time the operator files a Notice of Termination (NOT) to end coverage.

Do you need the AZPDES Industrial Stormwater Mining MSGP (Multi-Sector General Permit)? | See Mining >