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.
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
Guidance materials and resources: