Stormwater

Washington State Department of Ecology Industrial Stormwater Permits

Facilities that perform industrial activities as defined by Ecology are required to apply for and obtain coverage under one of the following Ecology permits for management of industrial stormwater:

  • Industrial Stormwater General Permit (ISGP);
  • Boatyard General Permit;
  • Sand and gravel General Permit; or
  • Individual permit.

Industrial activities that are required to obtain coverage under one of these permits are defined by Ecology as:

Facilities performing industrial activities that are not defined as boatyards or sand and gravel operations or who are not required by Ecology to obtain coverage under an individual permit are required to obtain coverage under the ISGP. Industrial activity requiring an ISGP is based on the facilities Standard Industrial Classification (SIC) Codes identified in the ISGP. An explanation of SIC codes is provided here. The requirements of specific components of the ISGP are further described here.

Regulatory Assistance - Washington State Department of Ecology