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

The MSGP is for stormwater discharges associated with industrial activities. Particularly, those stormwater discharges designated by ADEQ as:

•    needing a stormwater permit (e.g. facilities not covered under other sectors that discharge pollutants);
•    discharges that are not otherwise required to obtain Arizona Pollutant Discharge Elimination System (AZPDES) permit authorization but are commingling with stormwater discharges that are authorized under the permit;
•    or stormwater discharges subject to any of the effluent limitation guidelines in specific sectors.

Permit eligibility is required for certain types of facilities that fall within a specific sector of industrial activity. The sectors are based on Standard Industrial Classification Codes (SIC). There are 29 sectors listed in the MSGP.  Each facility within their designated sector stores hazardous materials. View Sector List > 

A facility must have permit coverage if an industrial activity falls within one of the sectors, has hazardous materials exposed to stormwater, discharges stormwater or has the potential to discharge stormwater to a Water of the U.S. (either directly or by way of a conveyance). The permit control measures are site specific, and based on the nature of the activities and types of pollutants potentially exposed to and transported by stormwater. The MSGP is valid for five years. An initial fee is due at the time the operator submits the Notice of Intent (NOI) fee to ADEQ, and is based on the amount of acreage at the site. 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.

If the industrial materials and activities are protected by a storm resistant shelter, the facility must apply for a no exposure certification (NEC).  Certain items may be stored outside without the benefit of shelters and still meet the definition of no exposure. Tightly sealed drums, barrels, tanks and similar containers are not exposed if they do not have operational taps or valves. In this context, sealed means banded or otherwise secured. Any material added or removed from these containers constitutes exposure. The NEC is intended to encompass the whole facility. Where exposure to industrial materials or activities exist at some but not all areas of the facility, the non-exposure exclusion is not allowed.  The NEC consists of an on-line form and a fee.  A NEC must be renewed every 5 years and currently there is no renewal fee.  

All sectors must obtain a MSGP or an NEC .  

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

AZPDES Industrial Stormwater Non-Mining and Mining MSGP Notice of Intent (NOI) | Download Application > 

AZPDES No Exposure Certification (NEC) | Download Application >


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