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Best Sump Pump & Backwater Valve Installers in Markham, Ranked (2026)

Last updated: By Below-Grade Records Desk

5 sump pump and backwater valve installers cover Markham, compiled August 2026.

672 Google reviews · median 4.86★ · typical $1,400–$2,400 per installed system (Tornado Plumbing & Drains (Toronto)) · 80% of rated companies at 4.8★ or above · scheduling: year-round; interior work is not weather dependent

Companies

Who does sump pump and backwater valve work in Markham?

August 2026 count for Markham: 5 sump pump and backwater valve installers, 4.86★ average on Google, 672 reviews in total. Half carry more than 49 Google reviews and half fewer. Full sump pumps & backwater valves cost guide.

Ranking

What decides the order on this page?

The WaterproofingIndex Score orders these 5 sump pump and backwater valve installers, whose median review count is 49. Position is not for sale. How the score is built.

Rules

Permits and subsidies for sump pump and backwater valve work

Permit rules and subsidies do not change between Markham and the rest of the GTA, so they are answered once, on the sump pumps & backwater valves page.

Coverage

Nearby areas and related work in Markham