​O&M Friendly Design

​and Install

Puyallup Training Center

Top News

May 16th

Proprietary Device Certification

​Puyallup Training Center

WOSSA Member

Education Scholarship

Submit by April 30, 2019

​​Application Information

​M-102 Maintenance Basics

Puyallup Training Center

​O-204 Electrical Control Panels

Kitsap Public Health District – Chambers Room, 345 6th St, Bremerton, WA 98337

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

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


Calendar of Events

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.

June 6th

May 2nd-3rd

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

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

Upcoming Training Classes

May 23rd

"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.

​Washington On-Site Sewage Association

WOSSA Membership

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Voice of the INDUSTRY