Washington On-Site Sewage Association

Washington On-Site Sewage Association - Wastewater Systems


"Voice of the Industry" for Members, Consumers, Our Communities & the Environment

Washington State has approximately 1.5 million decentralized wastewater systems in use, it is our mission as an Association, with the help of our members, consumers and local government; to ensure that we put the water back into our communities the way we found it. Helping to replenish nature’s support system with a long term sustainable approach to wastewater disposal and treatment.

Top News
Calendar of Events
Training Classes

The 2016 WOSSA Education Scholarship is here! Apply by
the April 30th Deadline.           

        Submission Deadline is
                April 30, 2016

     Click Here for More INFO! 

WOSSA Lobbyist Fundraiser  
WOSSA is the only organization in the State of Washington representing the interests of the Onsite Industry and we need your support to make sure that when some thing happens in Olympia when the legislature is in session, that we know about it.

Please donate today!

          Click Here to Donate

...more WOSSA events

WOSSA Developing Industry Specific Confined Space Entry Training           

We are excited to announce that WOSSA in collaboration with the Washington Department of Labor and industries SHIP Grant Program has created a CSE Training Program for workers in the On-Site Industry. Click on the photos below to view the WOSSA videos and interviews filmed as a part of the training.

...more WOSSA news 

The 2015 Fall - 2016 Spring Training Schedule is now Available, Click Link Below!


       2015 - 2016 Schedule
                 Click Here 

     Upcoming Training Events

OnlineRME O&M Reporting and Field Sampling   04.27.16
, WA.
Class is Being Rescheduled
O&M and Install of Proprietary Devices   05.3-4.16
, WA.

O-204 Electrical Control Panels Class   05.11.16
, WA.
O&M Friendly Design and Install of OSS   05.25.16
, WA.

...full class schedule



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