Skip to content
WaterproofingIndex

Best Sump Pump & Backwater Valve Installers in Toronto and the GTA

Last updated: By Below-Grade Records Desk

160 sump pump and backwater valve installers listed across the Greater Toronto Area, compiled August 2026.

33,561 Google reviews · median 4.9★ · typical $1,400–$2,400 per installed system (Tornado Plumbing & Drains (Toronto)) · 89% of rated companies at 4.8★ or above · scheduling: year-round; interior work is not weather dependent

Ranking

Who ranks highest for sump pump and backwater valve work in the GTA?

  3. Strong Plumbing Inc3

    Strong Plumbing Inc

    87/100 WaterproofingIndex Score

    0.3 km from Financial District centre

    Financial DistrictSump Pumps & Backwater Valves
    • Says it is licensed
    • Says it is insured

    Its own website describes below-grade water work

    Request a quote
  7. Canada Waterproofers7

    Canada Waterproofers

    85/100 WaterproofingIndex Score

    2.5 km from Mississauga centre

    MississaugaSump Pumps & Backwater Valves
    • Says it is licensed
    • Says it is insured

    Its own website describes below-grade water work

    Request a quote
  9. VHP Services Inc9

    VHP Services Inc

    84/100 WaterproofingIndex Score

    4.2 km from Mississauga centre

    MississaugaSump Pumps & Backwater Valves
    • Says it is licensed
    • Says it is insured

    Its own website describes below-grade water work

    Request a quote
  11. Top One Plumbing Inc.11

    Top One Plumbing Inc.

    83/100 WaterproofingIndex Score

    1.6 km from Willowdale centre

    WillowdaleSump Pumps & Backwater Valves
    • Says it is licensed
    • Says it is insured

    Its own website describes below-grade water work

    Request a quote
  14. John The Plumber14

    John The Plumber

    83/100 WaterproofingIndex Score

    0.2 km from Kensington Market centre

    Kensington MarketSump Pumps & Backwater Valves
    • Says it is licensed
    • Says it is insured

    Its own website describes below-grade water work

    Request a quote

160 companies are filed under sump pump and backwater valve work in the Greater Toronto Area, holding a median 4.9★ across 33,561 Google reviews. 158 of them describe this work on their own website; for the other 2 we go on the category Google files them under and say no more than that. Budget $1,400–$2,400 per installed system for primary sump pump installed in an existing pit, the GTA figure Tornado Plumbing & Drains (Toronto) publishes. Order comes from a published score out of 100: reviews, what a company states on its own site, and how complete its record is. Nobody buys a place on it.

Prices

What does sump pump and backwater valve work cost in the GTA?

Tornado Plumbing & Drains (Toronto) puts primary sump pump installed in an existing pit at $1,400–$2,400 per installed system. Tornado Plumbing & Drains (Toronto) prices new sump pit cut into a finished basement slab, basin and pump installed, discharge plumbed to exterior, slab restored at $2,800–$4,500 per installed system. Ontario charges 13% HST on top, and GTA contractors quote before tax. 8 line items are broken out below, each credited to the source that published it.

GTA sump pumps & backwater valves prices as published, August 2026. Every row names its source. Some of these prices are published by contractors this directory also lists. Those rows are marked. A company cannot buy a ranking position by supplying a figure.
ItemTypical rangeUnitSource
Primary sump pump installed in an existing pit (replacement, no concrete work)$1,400–$2,400per installed systemTornado Plumbing & Drains (Toronto)also listed in this directory
New sump pit cut into a finished basement slab, basin and pump installed, discharge plumbed to exterior, slab restored$2,800–$4,500per installed systemTornado Plumbing & Drains (Toronto)also listed in this directory
Sump pump replacement in an existing pit (lower-end GTA quote)$500–$1,200per installed systemMBM Plumbing (Markham)
New basic sump pump installation (pit plus pump)$1,200–$2,500per installed systemMBM Plumbing (Markham)
Sump pit excavation add-on where no pit exists (on top of the pump cost)$1,050–$2,700add-on to the pump priceCanada Waterproofers (Ontario, Toronto and GTA)also listed in this directory
Battery backup retrofit added to an existing primary sump pump$1,200–$2,400per installed systemTornado Plumbing & Drains (Toronto)also listed in this directory
Primary pump plus battery backup as one combined system (both pumps in one basin, dual check valves, battery pack)$3,500–$6,500per installed systemTornado Plumbing & Drains (Toronto)also listed in this directory
Mainline backwater valve, standard retrofit in a finished basement (saw-cut, dig, valve, slab restored)$2,800–$4,200per installed valve, before subsidyTornado Plumbing & Drains (Toronto)also listed in this directory

Open the full sump pumps & backwater valves cost guide

Coverage

Which part of the GTA is the job in?

Pick the city or neighbourhood to narrow the list to companies working there. 8 areas have enough listed sump pump and backwater valve installers for their own ranked page, each built from that area's own listings alone.

Ranking

How is this ranking built?

Position starts with an adjusted Google rating, which weighs how many people reviewed a company as well as what they scored it, so a 5.0 resting on three reviews does not sit above a 4.8 resting on three hundred. Added to it: what each company states on its own website, read off the page and stored with the sentence it came from, and how complete and reachable its record is. 89% of the rated sump pump and backwater valve installers here reach 4.8★, so the gaps between neighbouring positions are narrow and worth reading. Positions move as new reviews land, and no company is told about it in advance. Read our full methodology.

Frequently asked questions

What does sump pump and backwater valve work cost in Toronto and the GTA?

Tornado Plumbing & Drains (Toronto) publishes $1,400–$2,400 per installed system for primary sump pump installed in an existing pit, and Tornado Plumbing & Drains (Toronto) publishes $2,800–$4,500 per installed system for new sump pit cut into a finished basement slab, basin and pump installed, discharge plumbed to exterior, slab restored. Those are pre-tax figures, so add 13% HST. The sump pumps & backwater valves cost guide on WaterproofingIndex sets out every line item beside the source that published it.

How do I pick a sump pump and backwater valve installer in the GTA?

Three written quotes, each naming the same wall and the same scope, is the only comparison that means anything below grade: one firm can price an interior drain while another prices an excavation, and the totals will not be comparable. The shortlist above is every sump pump and backwater valve installer on record here, 160 of them, sitting at a median 4.9★ on a median of 85 Google reviews apiece. Ask each one for proof of insurance and for two addresses within a few streets where it did the same job.

When can sump pump and backwater valve work be scheduled in Toronto?

Year-round; interior work is not weather dependent. Frozen ground is what fixes the calendar: anything needing an open trench waits for the thaw, while work done from inside the basement carries on all winter. Ask each quote which parts of its scope need the ground open, because that single answer decides your start date.

Do these jobs need a permit, and does the quote include HST?

Ontario charges 13% HST on plumbing and waterproofing work, and GTA contractors publish their ranges before tax, so add it before comparing. Permits follow the scope, not the price. The City of Toronto requires a building permit and an inspection for a backwater valve, and charges an underpinning permit fee for lowering a basement or cutting a new below-grade entrance. Where a permit applies, the sump pumps & backwater valves cost guide prices it as its own line with the City's own figure.

Is there a subsidy for a backwater valve or sump pump in the GTA?

Toronto's Basement Flooding Protection Subsidy Program is built around exactly these devices, and a plumbing permit plus an inspection are normally part of the process. The sequence matters, because some steps have to happen before the work is done rather than after, and the amounts and eligibility rules are set by the City, so read the program page on toronto.ca first. Outside Toronto this is a municipal matter, so check what your own city offers before assuming the same terms. A contractor who has been through it will know the order of operations, so ask how many they have filed.

Can a company pay WaterproofingIndex for a higher position?

No, and there is nothing to buy. The order comes from a published score out of 100: an adjusted Google rating, what a company states on its own website, and how complete its record is. With 89% of rated sump pump and backwater valve installers at 4.8★ or better, positions here separate on narrow margins. The methodology page sets out the formula.

Questions to ask your contractor

  • Where does the discharge line end, and how far from the foundation is that? Typical installed pricing
  • What happens in a power cut, and is a battery backup part of this quote?
  • Is a new pit being cut into the slab, and who restores the concrete afterwards?
  • Which valve are you installing, and how do I get at it to clean it later? What each device actually protects against
  • Are you pulling the plumbing permit and handling the inspection?

Coverage

Where to go next

Below-grade problems rarely stay in one category. These are the other Greater Toronto Area rankings and guides on WaterproofingIndex.