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OOWA is an industry leader in education and advocacy for onsite sewage systems, commonly known as septic systems, and decentralized wastewater management in Ontario

Find a Professional

OOWA is dedicated to providing access to a large network of onsite wastewater professionals throughout Ontario. Our members include a wide range of disciplines such as sewage (septic) system design and installation to septic tank pump-outs, repair, and inspections.

Find a Professional

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When you become a member of OOWA, you are joining a network of engaged professionals who are leaders in the onsite industry and in their communities. Our members have access to leading continuing education resources and association benefits.

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Homeowner Resources

Our goal is to help homeowners find resources about septic systems. Learn more about how septic systems work, how to prolong their life, how to get one installed on your property, and why onsite wastewater management is good for your property and the environment.

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Video Library

Are you a rural homeowner looking to learn more about your sewage (septic) system? Are you an industry professional looking for resources? OOWA has started populating our new YouTube channel with content for various audiences. Check back often for our latest releases!

Make ELJEN your 2021 resolution!


Our members have access to quality education and training across the province. OOWA recognizes a number of educational providers who offer a wide variety of courses and training schedules. Courses delivered by these recognized providers may be used towards accreditation and experience requirements needed to qualify for the Registered Professional Program.

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Guidance Documents

OOWA’s Onsite Technical Committee (OTC) has prepared two peer-reviewed guidance documents with the goal of providing clarification and uniform practices regarding many industry undertakings including the installation of sand filter beds and pump chambers, to name a few.

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Find older issues of OOWA’s newsletter in our archive.

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Latest News & Events

OOWA’s new Decentralized Wastewater Systems webpage

Check out newest addition to the website – the intricacies of decentralized onsite and communal wastewater systems explained! […]

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Property Owners’ Responsibilities under the Ontario Building Code (OBC)

Rural property owners are also private wastewater management system operators. They don’t have the luxury of flushing and forgetting like their city cousins. This is because the solids that they do flush remain on their property (contained in their septic tank) and the resulting effluent is returned to the soil under their own septic leaching […]

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New Intro to OOWA Video!

In an increasingly digital world, it’s important to be able to get your message out on the mediums that reach people where they are. This is why OOWA’s On-line Resources Committee created this brief video (below). We need to let the general public and non-member onsite wastewater professionals know what OOWA does and why the […]

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