R.C. Harris Water Treatment Plant: A Toronto Landmark Story

Some of Toronto’s grandest rooms were built to clean water, and the best way to understand that is to stand outside this one.

What is the R.C. Harris Water Treatment Plant?

It is the plant at 2701 Queen Street East, in the Beaches, that the City says was constructed in the 1930s and opened in 1941. The City calls it the largest water treatment plant in Toronto, and says it produces approximately 30 per cent of the city’s drinking water and can produce 950 million litres daily.

The name honours Roland Caldwell Harris, who was Commissioner of Works from 1912 until his death in 1945. The Canadian Encyclopedia says that, in that role, Harris directed most of the major public projects of his era.

Why is it called the Palace of Purification?

Because it looks like one. The City says the plant is dubbed “The Palace of Purification” and describes it as the largest collection of Art Deco buildings in Toronto. The Canadian Encyclopedia says architect Thomas Canfield Pomphrey designed “an art deco masterpiece in brick, limestone and copper.” The City’s Beaches walking map adds the details that make it photogenic: green copper roofs and yellow brick walls.

Writers noticed, too. Michael Ondaatje wrote about Harris’s vision for the plant in his novel In the Skin of a Lion. Film and fashion crews have noticed as well: the City says the plant has been featured in many film, fashion and TV shoots.

What was here before the plant?

The City’s Beaches map says the plant was built in the 1930s on the original site of an amusement park named after Queen Victoria. The City bought Victoria Park in 1927 for use as a water purification plant. The west wing was finished in 1935 and the matching east wing followed in the 1950s. The map also notes that the plant was named for Beaches resident R.C. Harris, so this is a hometown landmark twice over.

Can you go inside the R.C. Harris plant?

Here is where timing matters. The Canadian Encyclopedia says the marble-clad interiors are usually accessible during Doors Open Toronto. Doors Open invites the public to explore the city’s most-loved buildings each May, free of charge, with rare access to buildings that are not usually open to the public. The City’s 2026 Doors Open map listed the plant at 2701 Queen Street East as a participating site.

The next Doors Open Toronto is scheduled for May 29 and 30, 2027. The City’s page is inviting sites to apply for 2027, so check the Doors Open page for the 2027 list before you plan around the plant.

A few tips from the City, which we are happy to pass along:

• Popular locations, including the R.C. Harris Water Treatment Plant, tend to draw large crowds and may have long wait times.
• Check site-specific hours and dates, and consider visiting early in the day.
• Vehicle access is restricted to people conducting official City business. Public vehicles cannot enter or park at the site, and the City suggests walking, biking or taking transit.

How do you pair it with a Beaches walk?

You do not need to be inside to enjoy it. The City’s Beaches route map suggests that, while you are at the eastern end, you walk down to the plant to admire the Art Deco buildings. From there you can head down to the lake and pick up the Boardwalk, or walk back up to Queen Street. The Boardwalk is a 3.5 kilometre path connecting the lakeside parks and beaches. That makes it an easy morning: Queen Street coffee, the plant’s roofs, then lake air.

For more of the story, read our guide to Toronto architecture, our look at Toronto City Hall’s design, and our guide to Doors Open Toronto. Another Art Deco favourite is on our list too: the Toronto architecture walk visits the Art Deco Round Room at the former Eaton’s College Street store.

Send this to the friend you would bring to the Beaches to look at a water plant on purpose.