Storm water that is exposed to industrial activity will require permit coverage based on the criteria in this section. However, industrial facilities meeting these criteria may also be eligible for an exclusion from permit coverage. Potential exclusions include: No Exposure of all Facility Activities Exposed to Storm Water, Discharge to a Combined Sewer System, or Storm Water does not have the Potential to Impact a Water of the State.

327 IAC 15-6 (Rule 6) (Select Rule 6, Storm Water Discharges Exposed to Industrial Activity from the index or Scroll to page 23) applies to all facilities described by one or more of the Standard Industrial Classification (SIC) Codes and/or meet specific activity categories; storm water that is exposed to industrial activity; and is discharged through a point source to waters of the state.

Industrial facilities generally are classified by Standard Industrial Classification (SIC) Code. This code is a four-digit number that corresponds to the type of industrial activity at a facility, and can be determined, on-line, from OSHA. Facilities currently using the North American Industry Classification System (NAICS) can find conversion tables into SIC Code online. Several of the SIC Codes and some additional non-classified industrial activity categories are subject to Rule 6. The following table describes the industrial SIC Code categories subject to Rule 6:

Regulated Industrial Activity Categories
SIC Code * Activity Description
10xx Metal mining
13xx Oil and gas extraction
14xx Nonmetallic minerals, except fuels
20xx Food and kindred products
21xx Tobacco products
22xx Textile mill products
23xx Apparel and other textile products
24xx Lumber and wood products
25xx Furniture and fixtures
26xx Paper and allied products
27xx Printing and publishing
28xx Chemicals and allied products
29xx Petroleum and coal products
30xx Rubber and miscellaneous plastic products
31xx Leather and leather products
32xx Stone, clay, and glass products
33xx Primary metal industries
34xx Fabricated metal products
35xx Industrial machinery and equipment
36xx Electronic and other electric equipment
37xx Transportation equipment
38xx Instruments and related products
39xx Miscellaneous manufacturing industries
40xx Railroad transportation
41xx Local and interurban passenger transit
42xx Trucking and warehousing
43xx United States Postal Service
44xx Water transportation
45xx Transportation by air
5015 Motor vehicle parts, used
5093 Scrap and waste materials
5541 Gasoline service stations **

* Although the actual SIC Code is a four-digit number, Rule 6 regulates the primary category group (i.e., the first two digits of the SIC Code) in many cases.

** Only gasoline service stations that act as truck stops or plazas and have on-site vehicle maintenance activities are potentially regulated under Rule 6.

In addition to SIC Code designation, several narrative categories of industrial activities are also potentially regulated under Rule 6. These narrative categories include:

  1. hazardous waste treatment, storage, or disposal facilities;
  2. landfills, land application sites, open dumps, and transfer stations;
  3. steam electric power generating facilities;
  4. wastewater treatment plants with a design flow of 1,000,000 gallons per day or more; and
  5. agricultural chemical fertilizer and pesticide distribution facilities.

If it is determined that a facility meets the applicability requirements of the Rule, the Responsible Individual is required to obtain a General Permit. The procedure for obtaining this permit is outlined in Step-by-Step Process for Compliance with 327 IAC 15-6.

For more information regarding the applicability requirements for 327 IAC 15-6, please contact the Storm Water Permit Coordinator.