Stormwater permit compliance requirements for business properties which discharge directly or indirectly into an impaired and threated waterbody (e.g. stream/river segments and lakes) are different than for other businesses. These waterbodies are also known as 303(d) listed waterbodies.

ECOSS is teaming up with the Washington Stormwater Center and WA Department of Ecology to bring you a free presentation about what these different compliance requirements mean to your business. Bring your lunch and learn along with other businesses across the state.  

On April 22, 2021 from 11:30 AM to 1:00 PM, Travis Porter, WA Department of Ecology’s Industrial Stormwater General Permit (ISGP) writer, will be presenting a free online webinar on Section 6 of the permit: Discharges to Impaired Water Bodies (303(d) listings).  

Topics include:

  • Presentation for ISGP permittees discharging directly or indirectly to a 303(d) listed waterway;
  • Additional sampling requirements; 
  • The difference between a benchmark and an effluent limit; 
  • Impacts on businesses added in January 2019 to the 303(d) listed businesses effective January 1, 2022 

You will also be able to ask questions anonymously during the presentation, and all attendees will receive a Frequently Asked Questions summary document after the event.  


Disclaimer:  This presentation will not offer legal advice. We are here as an educational resource to help you better understand the impacts and implications of the 303(d) list and TMDLs. We are not guaranteeing compliance with your attendance at this presentation. Each of you will have different issues to address at each unique site.