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.). 

Unlike wastewater that is treated before being discharged to waters of the U.S., 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 waters of the U.S.

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 water of the U.S. If industrial stormwater will not discharge to waters of the U.S., either directly or by way of a conveyance (such as a street, ditch, etc.), stormwater permit coverage is not required.

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 become effective on January 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 may update their current SWPPP to comply with the 2019 MSGP requirements rather than developing a new SWPPP 
  • Prior to January 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 >

2010 Industrial Stormwater MSGP

2010 Mining MSGP

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 | View SWPPP Template & Requirements > 

AZPDES Industrial Stormwater Non-Mining MSGP & Fact Sheet | Download Zip Folder >


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 1 acre | $350 *
  • – 40 acres  | $500 * 
  • Greater than 40 acres  | $1000 *

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.