Septic tanks & wastewater treatment plants

Septic tanks and wastewater treatment plants in Canada

Updated 4 November 2026

Septic tanks in Canada cost from about CA$2,600 for a 4,200 L prefabricated tank, and a treatment plant for 100 KLD (kilolitres a day) costs about CA$1,200 to CA$1,400. Treatment products for an existing tank cost about CA$30 to CA$150. These are approximate prices, according to sellers' websites in November 2026, and rules differ by province, so request quotes for your site on BlaBlaPrice.

Provincial rules and what to check

Each province and territory sets its own rules for on-site sewage. Ontario's Building Code, Part VIII, sets minimum requirements for sewage systems and applies different rules above 10,000 litres a day. Alberta publishes a standard of practice for private sewage systems, New Brunswick's guidelines require a tank to sit level on a level pad, and Yukon requires tanks to meet the current CSA standard. Check which rule applies to your province before you buy.

Tank size and certification

Canadian standards suggest that a septic tank should hold between 2,800 and 6,650 litres, with liquid capacity between 2,260 and 5,800 litres. Prefabricated tanks should meet the national standard for design, material, manufacturing and markings. Some federal protocols for decentralised systems require effluent filters certified to NSF/ASTM 46, so ask the seller for the filter model and certificate.

Season and installation timing

Winter runs from December to February, and digging and levelling a tank in frozen ground is harder, so most installations fall between June and August. A seasonal cabin used only in summer needs a tank sized for its occupants and the months it is used. A permanent home needs the same capacity all year, so state which one you have in the request.

What to write in the request

Say whether you need a tank, a treatment plant or treatment products for an existing tank. For a plant, give the number of residents and the daily volume in litres or KLD. Add whether the home is permanent or seasonal, soil and water conditions if known, the make and model if you have one, whether installation is included, the city and site type, and your budget in CA$. Share the exact address only with the seller you choose.

Getting offers through BlaBlaPrice is free for buyers. Describe the system and the site in your own words in the chat, and the assistant asks for missing details such as residents and soil type. It then looks through sellers' websites and price lists in Canada and shows the prices and businesses it found. Sellers registered on BlaBlaPrice reply in the chat with their offer, delivery and installation terms, and your contacts stay hidden until you choose to share them. See building and renovation and plumbing, or how BlaBlaPrice works.