Ecology Announces Modified Industrial Stormwater General Permit

Published Feb 07, 2012

The Department of Ecology began a 45-day public comment period on proposed modifications to the 2010 Industrial Stormwater General Permit (ISGP) on February 1, 2012.  After March 16, 2012 at 5:00 p.m. the comment period will be closed.  The Pollution Control Hearings Board (PCHB) ordered Ecology to modify the ISGP to comply with the PCHB’s April 2011 ruling requiring alterations to the permit’s sampling and corrective action provisions.  Significant changes to the permit include the replacement of numeric effluent limitations for fecal coliform bacteria with narrative Best Management Practices (BMPs).  Approximately 80 industrial facilities discharging to 303(d)-listed impaired waterbodies would be affected by this change.  Ecology has scheduled several workshops on the proposed modified permit, and will hold a public hearing on March 12, 2012 at South Seattle Community College.  For more information, contact James Tupper at

  • To view the draft permit and fact sheet, and to see upcoming public workshop dates, click here.