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 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

O&M Friendly Design and Install of On-Site Septic Systems   11.05.15
Sequim, WA
Pathogen Exposures in OSS   11.12.15
Puyallup, WA
D-201 Design, Install and O&M Sub-Surface Drip   11.18.15
Puyallup, WA
Design of Mounds and Sub-Surface Drip
Bellingham, WA

Location: Four Points by Sheraton Bellingham Hotel & Conference Center  - 714 Lakeway Drive, 
Bellingham, WA. 98229  
I-202 WAC / RS&G for Installers    12.03.15
South Bend, WA
Please Call to Register: 253.770.6594

Location: County Annex - 1216 W Robert Bush Drive - BOCC Meeting Room.  
I-202 WAC / RS&G for Installers   12.10.15
Puyallup, WA
Safety Management, First Aid / CPR   12.16.15
Puyallup, WA
...full class schedule



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