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.

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WOSSA Safety Training Videos




In a deliberate effort to raise awareness and reduce workplace injuries related to Pathogen Exposure, Confined Space Entry and the OSHA Construction Focus Four; Falls, Caught-in,-by, Struck by and Electrocution, WOSSA has developed new training resources that focus on workers in the On-Site industry. This training delivers both knowledge and practical skills to address the numerous hazards that are unique to our industry.

These videos were developed by WOSSA as an integral part of these safety training classes.

...more WOSSA events


WOSSA's 2017 21st Annual Statewide Conference and Exhibitor Show, Tacoma WA.

The Washington On-Site Sewage Association would like to thank all who were in attendance at the 2017 21st Annual WOSSA Statewide Conference and Exhibitor Show. We had a great turnout with more than 400 on-site professionals and product representatives in attendance. We also raised a record $40,000 dollars towards the WOSSA Member Scholarship and legislative fundraiser. Thank you to all who helped make this show a great success!

      Click Here to See Photos
         from the Conference

...click here for more 

The Spring 2017 Schedule 

        2016-2017 Schedule
                 Click Here


     Upcoming Training Events

D-109 Design Siting   02.22.17
Oak Harbor, WA
M-201 Troubleshooting & Maint. of OSS

Bellingham, WA
M-201 Troubleshooting & Maint. of OSS
Mt Vernon, WA
WAC 246-272A Review    03.18 & 19.17
Puyallup, WA
...full class schedule



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