NPDES Stormwater Program
11 Categories of Stormwater Discharges Associated with Industrial Activity


The Phase I stormwater regulations created 11 categories of Stormwater Discharges Associated with Industrial Activity. Facilities in these categories must have an NPDES permit for their stormwater discharges. Categories i through ix and category xi are commonly called the Stormwater NPDES Industrial Program. Category x and the new Phase II requirements for Small Construction Sites together are called the Stormwater NPDES Construction Program.

24 - Lumber and Wood Products (except 2434 - Wood and Kitchen Cabinets)
26 - Paper and Allied Products (except 265 - Paperboard Containers and Boxes and 267 - Converted
Paper and Paperboard Products, except Containers and Boxes)
28 - Chemical and Allied Products (except 283 - Drugs)
29 - Petroleum and Coal Products
311 - Leather Tanning and Finishing
32 - Stone, Clay, Glass, and Concrete Products (except 323 - Glass Products, Made of Purchased Glass)
33 - Primary Metal Industries
3441 - Fabricated Structural Metal
373 - Ship and Boat Building and Repairing

10 through 14 - Mineral Industry (including active and inactive mining). Non-metallic mineral mining is covered exclusively by another NPDES program area under general permit SCG730000.

40 - Railroad Transportation
41 - Local and Interurban Passenger transport
42 - Trucking and Warehousing (except: 4221 - Farm Product Warehousing and Storage, 4222 -
Refrigerated Warehousing and Storage, and 4225 - General Warehousing and Storage)
43 - U.S. Postal Service
44 - Water Transportation
45 - Transportation by Air
5171 - Petroleum Bulk Stations and Terminals (this does not include service stations or facilities that sell only packaged products)

20 - Food and Kindred Products
21 - Tobacco Products
22 - Textile Mill Products
23 - Apparel and Other Finished Products Made From Fabrics and Similar Material
2434 - Wood Kitchen Cabinets
25 - Furniture and Fixtures
265 - Paperboard Containers and Boxes
267 - Converted Paper and Paperboard Products, except Containers and Boxes
27 - Printing, Publishing, and Allied Industries
283 - Drugs
285 - Paints, Varnishes, Lacquers, Enamels, and Allied Products
30 - Rubber and Miscellaneous Plastic Products
31 - Leather and Leather Products (except 311 - Leather Tanning and Finishing)
323 - Glass Products, Made of Purchased Glass
34 - Fabricated Metal Products (except 3441 - Fabricated Structural Metal Products)
35 - Industrial and Commercial Machinery and Computer Equipment
36 - Electronic and Other Electrical Equipment and Components, except Computers
37 - Transportation Equipment (except 373 -Ship and Boat Building and Repairing)
38 - Measuring, Analyzing, and Controlling Instruments; Photographic, Medical and Optical
Goods; Watches and Clocks
39 - Miscellaneous Manufacturing Facilities
4221 - Farm Product Warehousing and Storage
4222 - Refrigerated Warehousing and Storage
4225 - General Warehousing and Storage


Bureau of Water . Phone: (803) 898-4300 . Fax: (803) 898-3795 . Contact Us