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​Washington On-Site Sewage Association

WOSSA Conference

Top News

Feb. 21st

Liens and Contracts

(Puyallup, WA)

For over 20 years WOSSA's goal has been to promote professional excellence through education, advocacy...

Pathogen Exposures in OSS


Whether you’re an employer or someone looking to get hired on, having the skills, attitude and knowledge...

Upcoming Training Classes


Jan. 26th - 27th

January 26th & 27th

Calendar of Events

Feb. 14th

In a deliberate effort to raise awareness and reduce workplace injuries related to

Pathogen Exposure, Confined Space Entry, OSHA Construction Focus Four: Falls, Caught-in or between, 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.

It is always a challenge to find a quality service provider within any trade...

Washington On-Site Sewage Association MembershipRecently, Jerry Stonebridge, John Thomas...

 WOSSA 22nd Annual Conference

(Tacoma, WA)

D-201 Design Siting

(Puyallup, WA)

"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.

Feb. 28th

Voice of the INDUSTRY