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National Pollutant Discharge Elimination System (NPDES): 33 USC 1342
NPDES permit application regulations for stormwater discharges (Phase I final rule): 55 Federal Register (FR) 47990 (11/16/90)
Overview of Stormwater Discharge Regulation at Industrial Facilities
The U.S. Environmental Protection Agency (EPA) rules define a stormwater discharge associated with industrial activity as "the discharge from any conveyance ... used for collecting and conveying stormwater and which is directly related to manufacturing, processing or raw materials storage areas at an industrial plant" (40 CFR 122.26(b)(14)).
Essentially, this means that any stormwater coming in contact with any aspect of a defined industrial activity and discharged through a discernible outfall must be in compliance with the current National Pollutant Discharge Elimination System (NPDES) stormwater permitting program. Regulated industrial facilities are identified either by their Standard Industrial Classification (SIC) code number or by a general description in the rule.
Operators of facilities or sites with activities included within one of the 11 categories listed in TABLE 1 in this section are subject to the NPDES stormwater program and are required to obtain permit coverage ...