Basement Flooding in Oakville: Two Governments, One Sewer Connection and the Halton Subsidy

Which pipe, which government

Sewer backup arrives at the floor drain, a basement toilet or the laundry standpipe, during or just after heavy rain, and smells like sewage: that is the sanitary system, which Halton Region owns beyond your property line. Groundwater arrives clear at the wall-floor joint and through cracks after long rains and in the thaw: that is your weeping tile and drainage. Water coming down the driveway, over a window well or up a creek valley is storm water: the Town of Oakville owns the storm sewers, the catch basins and the creeks, and Conservation Halton regulates the valleys.

Photograph where the water first appeared and when. Halton Region and the Town each have a number to report a problem on their side; a plumber handles yours.

Halton Region’s subsidy

Halton Region has run a Basement Flooding Prevention Subsidy Program that contributes toward the cost of a backwater valve on the sanitary lateral, a sump pump and pit, and disconnecting the foundation drain from the sanitary sewer, at eligible homes in Oakville, Burlington, Milton and Halton Hills. The work must be done by a licensed plumber under a Town plumbing permit and inspected, and the subsidy is claimed after completion. The eligible amounts and rules change; read the Region’s current program page before signing a quote.

A backwater valve closes when the sewer surcharges so sewage cannot flow back into the house; while it is closed nothing in the house drains. A sump pump moves groundwater from the foundation drain outside; a battery backup keeps it running through the outages that come with the storms.

• Eligibility confirmed on Halton Region’s program page
• Licensed plumber and Town of Oakville plumbing permit number
• Camera inspection recording and locate
• Itemized invoice for valve, pump and labour
• Subsidy claim submitted after completion

Old Oakville, the creeks and the new north

Houses in Old Oakville, Bronte and Kerr Village from the 1920s to 1960s often have clay weeping tile that silted up decades ago and block foundations that clay-held water passes through; waterproofing there is excavation, a membrane and new drainage. Properties along Sixteen Mile Creek, Bronte Creek and the smaller ravines face spring flooding from the creek itself, which no sump pump fixes; Conservation Halton publishes flood-plain mapping and regulates work in the valleys. North of Dundas, the post-2005 houses have builder-installed sump pumps in pits that may never have filled, and the first storm is the first test.

In every case, extend downspouts well away from the foundation and correct grading before spending on anything underground.

Insurance and contractors

Sewer backup and overland water are usually separate add-ons on an Ontario home policy, and insurers ask whether a backwater valve is installed. Keep the camera recording; it is what an insurer wants for a claim. Plumbing contractors in Ontario need a licensed plumber on the job and a Town permit for the work; ask for the licence, the permit and the WSIB clearance. Consumer Protection Ontario’s rules on written contracts and cancellation apply to work agreed in your home.