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Basement flooding and sewer backup in Greater Toronto

Plumbers for backwater valves, sump pumps and drains.

100 pros in Greater Toronto

These plumbing, drain and waterproofing firms serve Toronto and say on their own websites that they install backwater valves or sump pumps. Two Toronto points before you hire: the City's Basement Flooding Protection Subsidy pays only on invoices from contractors holding the right City licence, and a backwater valve needs a building permit. On 16 July 2024, with more than 100 mm of rain in parts of the city, 311 took more than 700 basement flooding calls in a day.

Source: City of Toronto (source, opens in a new tab)

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Not yet verified. We checked each one’s own website for this work, and the licence in the public register where one applies, but we haven’t contacted them yet. How a business gets listed

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Before you hire

  1. A building permit is required to install a backwater valve in Toronto.

    Source: City of Toronto (source, opens in a new tab)

  2. The City’s Basement Flooding Protection Subsidy pays only on invoices from City-licensed plumbing (T94, T92) or drain (T87) contractors.

    Source: City of Toronto (source, opens in a new tab)

  3. For work done since 12 November 2025 the subsidy covers up to 80% of the invoiced cost, within set limits per device.

    Source: City of Toronto (source, opens in a new tab)

Questions about hiring in Greater Toronto

Who can install a backwater valve or sump pump in Toronto?

A plumbing contractor, plumbing and heating contractor or drain contractor licensed by the City of Toronto. The City lists which licence covers which job, and the basement flooding subsidy pays only on invoices from those licensed contractors. A backwater valve also needs a building permit, so ask the contractor who takes it out and books the inspection. City of Toronto (source, opens in a new tab)

What should a written quote include?

The work and materials described item by item, the price of each part, who gets the permit, what happens to the floor slab or landscaping afterwards, the warranty, and start and finish dates. If you plan to claim a subsidy, ask for an invoice that itemizes each device separately, such as a sump pump and its battery backup, and names the licensed contractor.

How do I compare quotes?

Ask two or three contractors to look at the same problem and quote the same scope: the same number and type of valves, the same pump and pit, the same repair afterwards. A plumbing assessment first helps, because it tells you what the house needs before anyone sells you a device. Check each licence before you sign.

Does Toronto help pay for a backwater valve or sump pump?

Yes. The Basement Flooding Protection Subsidy pays up to 80 per cent of the invoiced cost, with set maximums per device, for owners of houses up to fourplexes. It covers a home plumbing assessment, backwater valves, sump pumps and battery backups and severing the foundation drain connection. Each property has a lifetime maximum per type of work. City of Toronto (source, opens in a new tab)

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