REGISTRATION IS NOW OPEN for OOWA's 2023 Annual Convention & Expo. Learn More

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

Team huddle


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.

Learn More about Joining

Woman using smart phone

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.

Browse Resources

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!

Advertise with OOWA1


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.

Learn More About Training

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.

Learn More


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

View Archive

Latest News & Events

OOWA Industry Award Nominations

Do you know of an OOWA member or organization whose work is exceptional, towards improving the industry, communities, and the environment? If so, please nominate them them for one of our awards! The nomination form and award details are provided below. The deadline for nominations is Friday, February 10, 2023 at 5:00 pm. […]

Read More…

FAQ’s From Inspectors on Key Inspection Points – Now Available!

OOWA’s Onsite Technical Committee is back at it! Our latest document comes in the format of Frequently Asked Questions. We consulted with Inspectors from all over the Province to learn their top questions on key inspection points. Click on the picture to view the document. Please send any comments to […]

Read More…

OOWA’s Fall/Winter 2022 Onsite Newsletter released!

In this edition, you’ll find the following content: An insider’s look into Clearford’s First Nations operations Site evaluation, loading determination, and treatment train components Funding sources for property owners to repair or replace onsite sewage systems Finding malfunctioning septic systems New guidance for source protection for non-municipal drinking water Employee recruitment, retention, and turnover Ontario […]

Read More…

View all News