Founded in 1990, the Washington On-Site Sewage Association is a non-profit trade association serving the on-site wastewater industry. Today the organization has grown to encompass all disciplines of the industry, has continued to expand its impact, and supports improvement in all of the industry's professions. These professional areas include regulators, designers, installers, operations and maintenance support, and manufacturers/suppliers operating in the state of Washington. WOSSA has since been a leading onsite professional membership association for the onsite septic industry with key consideration to the Consumer, Public Health and the Environment.
“WOSSA exists to represent our diverse industry through education, certification, legislative involvement, ethical standards and technical advancement to elevate the professionalism within all segments of our Onsite Waste Water Community.”
With more than 300 industry professional members and member companies in the state of Washington, WOSSA serves as the voice of the on-site industry and the resource for our members in service to our communities.
Organizational StructureThe Washington On-Site Sewage Association is governed by a Board of Directors, a statewide elected governing body that provides long-range strategic leadership. The Board is composed of elected WOSSA officers, including the president, vice president, past president, secretary, and treasurer; elected representatives from each of WOSSA’s 4 regions; a supplier’s and manufacturer’s representative; an operations and maintenance representative; a pumper’s representative; a designer’s representative; an installer’s representative; and a public regulator’s representative from one of the local health jurisdictions.
Board Of Directors
Visit the Board of Directors Directory for Leadership information and member profiles. If you’re a WOSSA member, request approved minutes from past board meetings.
Decentralized Wastewater Technology
“Decentralized system” has become a commonly-used term to describe a wastewater treatment system that treats and disperses wastewater from individual homes or a cluster of homes at or near the source of the wastewater discharge. Decentralized systems include onsite and cluster treatment systems. Systems may serve a cluster of homes, a subdivision or small community as well as commercial and industrial complexes. If multiple sources are served by a cluster system, a collection system may be included to receive and convey the wastewater to a combined treatment and dispersal component. These systems take advantage of the vast capacity of soil to remove or transform pollutants that are in the effluent as it percolates through the soil thereby avoiding point discharges to surface waters and maintaining the quality and quantity of our groundwater.