Applicablity

This page provides information to help facilities determine if they need industrial stormwater permit coverage. Any facility that is engaged in a Narrative Activity or a Primary SIC Code, as listed within Appendix D of the Multi-Sector General Permit, or within the table below, needs to apply for permit coverage or certify for No Exposure.

municipal airport with fueling activities requiring permit coverage

Have a specific question or situation regarding applicability? Check out these resources first:

• Is My Facility Required to Obtain the Industrial Stormwater General Permit?
• Municipally-Owned and Operated Industrial Activities
• Solid Waste Facilities - A guide to Minnesota’s Industrial Stormwater Permit
• Guidance on the Industrial Stormwater Permit for Transportation Sectors
• Guidance on the Industrial Stormwater Permit for the Air Transportation Sector (Sector S)

What's a Narrative Activity? These activities require permit coverage even if it's not the "primary" activity at a facility. Facilities with these activities are always required to obtain permit coverage:

Subsector	Subsector description
A4	Timber products: discharges from wet decking storage areas
C1	Runoff from phosphate fertilizer manufacturing facilities that comes into contact with any raw materials, finished product, by-products, or waste products
D2	Discharges from production of asphalt emulsions areas
E3	Cement manufacturing facility, material storage runoff (note: this is not a concrete ready mix facility)
K1	Hazardous waste treatment/storage/disposal facility for discharges not subject to effluent limitations in 40 CFR pt. 445, subp. A (note: this is not a hazardous waste generator)
K2	Hazardous waste treatment/storage/disposal facility for discharges subject to effluent limitations in 40 CFR pt. 445, subp. A (note: this is not a hazardous waste generator)
L1	Municipal solid waste landfill areas closed in accordance with 40 CFR 258.60
L2	Open or closed non-hazardous waste landfill and land application site not discharging to surface water
L3	Landfill that discharges to surface waters stormwater that has directly contacted solid waste
O1	Coal fired and oil fired steam electric generating facility
O2	Nuclear, natural gas fired, and any other fuel source used for steam electric generation
O3	Runoff from coal storage piles at steam electric generating facility
S3	Existing and new primary airports with 1,000 or more annual jet departures that discharge wastewater associated with airfield pavement deicing that contains urea commingled with stormwater
T1	Treatment works with design flow of one million gallons per day or more or are required to have an approved pretreatment program under 40 CFR pt. 403

How do I look up a SIC code? What if I have a NAICS code?

• Find your SIC Code in the 1987 version SIC manual.
• If you have a North American Industrial Classification System (NAICS) code, enter it to find the applicable SIC code: HTML icon 1997 NAICS and 1987 SIC Correspondence Tables
• Convert NAICS code to a corresponding SIC code