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

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's 21st Annual Conference will be held in Tacoma on January 27th &28th

Plan to join us at our 21st Annual WOSSA Education Conference and Trade Show. Our focus this year is "Going the Distance"! In part, it reflects that while it has been a tough 10 year recovery, some of the prime economic indicators are telling us that things are definitely better. Like a marathon runner who has pushed through the "wall" at the 16 mile mark, we are setting our sites on the finish line as we plan into our future.  But you must have a race strategy to run the next 10 miles ... Are you ready to "Go the Distance?"
...click here for more 

The New Fall 2016 - Spring 2017 Schedule is Now Available!

        2016-2017 Schedule
                 Click Here


     Upcoming Training Events

I-101/102 Basics of Installation
Puyallup, WA
M-201 Troubleshooting & Maint. of OSS   11.09.16
Puyallup, WA
D-201 Design, Install and O&M of SSD

Puyallup, WA
Installation of Mounds / SF   12.07.16
Puyallup, WA
O&M Friendly Design and Install of OSS   12.14.16
Puyallup, WA
...full class schedule



Website Builder