M1L2NPDES_regulatedactivities

Module I

Lesson Two: NPDES Stormwater Permit Program

Stormwater Permit Regulated Activities

40 CFR Subpart 122.26(b)(14) lists 11 types of industrial operations that require operators of these industrial facilities or sites to obtain coverage under an NPDES industrial stormwater permit, unless conditionally excluded. They are:

Category One (i): Facilities with effluent limitations
Category Two (ii): Manufacturing
Category Three (iii): Mineral, Metal, Oil and Gas
Category Four (iv): Hazardous Waste, Treatment, or Disposal Facilities
Category Five (v): Landfills, Land Application Sites, and Open Dumps
Category Six (vi): Recycling Facilities
Category Seven (vii): Steam Electric Power Facilities
Category Eight (viii): Transportation Facilities
Category Nine (ix): Treatment Works
Category Ten (x): Construction Activity *
Category Eleven (xi): Light Industrial Activity

* Category Ten (x): Construction Activity that disturbs 5 or more acres of land is included in the definition of "stormwater discharges associated with industrial activity." For small construction that disturbs from 1 to 5 acres of land has been required by EPA to obtain a permit in the Phase II Stormwater Permit Program. More information about stormwater discharges from construction activities is available by click here.

The details of the 11 categories listed above are mostly identified by Standard Industrial Classifications (SIC) or by a description of the industrial activity. Click here to see the detailed list of the regulated industrial activities classified by SIC. Using SIC to identify a fa cility’s industrial activities will gradually be replaced by The North American Industry Classification System (NAICS). The NAICS production-oriented conceptual framework has been developed in cooperation with Canada and Mexico . The NAICS groups establishments into industries based on the activity in which they are primarily engaged. For example, establishment using similar raw material inputs, similar capital equipment, and similar labor are classified in the same industry. The U.S. Census Bureau has a conversion table to bridge the two systems. A Federal Register notice (January 16, 2001) documents the final adoption of the NAICS revisions.