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
Calender of Events
Training Classes

2014 WOSSA Member Scholarship Program

Early applications received prior the March 31, 2014 postmark deadline will be eligible to receive a $250 award

... click here for more information

2015 19th Annual WOSSA Conference
    Credit Chuck Lysen

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

         January 22, 23 & 24

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

2013 Fall - 2014 Spring Training Schedule is Here!
...full class schedule

D-201 Sub-Surface Drip: Design, Install and O&M - April 16, 2014 (Moses Lake)

This class explores the practical application of subsurface drip systems and Washington State guidelines, including detailed discussion of design procedures of different types of drip systems with various components, installation techniques and O&M needs based on different technologies and current applications.


Best Western – Moses Lake, WA. 

3000 Marina Drive

Moses Lake, Washington 98837

P-101 Pumper Training - April 23, 2014 (Vancouver, WA.)

This class will give you or an employee critical skills & information that can be used “on the job” right away. Including: equipment O&M, vacuum pump operation, safety issues, DOT issues - Pre & Post trips, customer relations, spill handling procedures, troubleshooting & repairs, locating, inspections & problem solving.


WOSSA Training Center
 To Be Announced

...more WOSSA news

Training Date
D-109 Design Siting of On-Site Systems   02.19.14
Puyallup, WA
Trouble Shooting

Puyallup, WA
D-201 Design, O&M & Install of Sub Surface Drip    03.19.14
Bellingham, WA 
Please call to Register 
D-301 High Strength Waste
Puyallup, WA
D-201 Design, O&M & Install of Sub Surface Drip    04.16.14
Moses Lake, WA
P-101 Pumper   04.23.14
Vancouver, WA
...full class schedule


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