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

2014 - 2015 Washington Legislative Session Lobbyist Development Fundraiser


When the legislature is in session, they consider nearly 4,000 bills. They make decisions that affect you whether you are involved or not. 

WOSSA has had a successful grass roots effort over the last 10 years representing the industry in the legislature, but now WOSSA has hired a firm to work with the board and industry to make sure that our voice and our issues are being heard and if necessary, the introduction of legislative change.

We are 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 by clicking on the following link...

        Click Here to Donate

Washington State DOH Issues 2012 RS&G's

The Washington State Department of Health has issued updated RS&G's which are available below in PDF form. WOSSA has consolidated all 15 of the new RS&G sections into one document. Bookmarks have been added for each section of this 500 page update. We hope that this will help to make your use of the RS&G's a little more efficient.

          2012 WA DOH RS&G

...more WOSSA events

2015 19th Annual WOSSA Conference                       

We are Excited to Announce that the 2015 WOSSA Conference Will be Held in Tacoma, WA!
         January 23 & 24

...more WOSSA news 

The 2014 Fall - 2015 Spring Training Schedule is Here!

        2014 - 2015 Schedule
                 Click Here 

     Upcoming Training Events

Training Date
WAC 246-272A Exam / Review   Class is being rescheduled 
O&M and Installation of Proprietary Devices   10.1 & 2.14
Puyallup, WA
M-102 Maintenance for OSS    10.09.14
Puyallup, WA
O-204 Electrical Control Panels    10.23.14
Puyallup, WA
D-303.2 CAD Design and Mapping #2    11.06.14
Puyallup, WA
Pathogen Exposures in OSS    11.13.14
Puyallup, WA
D-201 Design, Install and Maintenance of SSD    11.20.14
Puyallup, WA
D-303.3 CAD Design and Mapping #3    12.04.14
Puyallup, WA
Pathogen Exposures in OSS     12.04.14
Pt. Angeles, WA
O&M Friendly Design and Install of OSS    12.11.14
Puyallup, WA
Pathogen Exposures in OSS    12.11.14
Mt. Vernon, WA
Safety Management, First Aid/CPR    12.18.14
Puyallup, WA
O-202 Proprietary Systems    01.08.15
Bremerton, WA
...full class schedule



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