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

P-101 Pumper Training - April 23, 2014 This class is being rescheduled for a later date (Vancouver, WA.)

M-301 Certification of Proprietary Devices: Install and O&M - May 6 & 7, 2014 (Puyallup)

This advanced level, 2 day Class is for O&M Service Providers, that LHJ’s require to have O&M level 2 or "specialists" to get proprietary device certification from the manufacturer. This course will certify O&M Service Providers on Nu-Water, Norweco, Orenco, Salcor, Jet, Bio-Microbics, Multi-FLOW and Delta Environmental - Pentair Water proprietary treatment systems. (Note: this is a 2-day class)


Puyallup Training Center – WSU Extension Campus
2606 W. Pioneer, Puyallup WA. 98371

...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
This class is being rescheduled for a later date
...full class schedule


Website Builder