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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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

Don't Miss out on the Last Scheduled Training Event of the Spring
Confined Space Entry Training for Workers in OSS: This Class is Being Rescheduled

...more WOSSA news 

The New Fall 2016 - Spring 2017 Schedule is Now Available!

        2016-2017 Schedule
                 Click Here


     Upcoming Training Events

M-201 WAC Review / Exam Review   10.1-2.16
Puyallup, WA
M-102 Maintenance for OSS   10.12.16
Puyallup, WA
O-204 Electrical Control Panels   10.26.16
Puyallup, WA
I-101/102 Basics of Installation   11.02.16
Puyallup, WA
...full class schedule



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