Backwater valve subsidies: what exists on the South Shore
A provincial program covers backwater valves from 1 October 2026. Municipally, one town on this territory subsidises — the rest require the valve without funding it.
Updated
Rénoclimat: the provincial program, from 1 October 2026
The Government of Québec is committing $425 million over five years to a new adaptation component of the Rénoclimat program, in force on 1 October 2026. It funds exactly the work that protects a basement: backwater valve, battery-backed sump pump, removable flood barriers.
That is a real change for the South Shore. Until now, an owner in Boucherville or Brossard who wanted protection paid the full cost: the city required the valve without funding it. The provincial program applies everywhere, regardless of municipality.
One caveat, and it matters: as of 22 September 2026 the detailed criteria and application process had not been published. Do not commit to work assuming you will be reimbursed — first confirm the program is open and what it requires.
- Simple work: $700 to $1,000 — battery-backed sump pump, backwater valve, removable barriers.
- Diagnostic: up to $1,000 to have your building’s climate risk assessed.
- Flood zone: up to $35,000 for complex work — foundation protection, sealing openings, adapting the plumbing.
- Combined maximum: $38,500 per dwelling across all components.
Municipally: one city subsidises
We checked all 21 municipalities we serve on 22 September 2026. The result is striking: only one publishes a backwater-valve subsidy program.
Contrecœur offers up to $500 toward purchase and installation, for single-family homes built before 1 January 2000. The permit from the Service de l’urbanisme must be obtained BEFORE the work, and the application filed within 12 months.
Elsewhere the pattern is consistent: the city makes the valve mandatory by by-law but does not fund its installation. Boucherville is the clearest example — the device is required there, and the City’s subsidy programs cover gutters and reverse-slope driveways, not the valve.
That absence is not bad news in itself: it simply means the provincial program becomes, from October, the main source of assistance for most owners on this territory.
What your plumber must provide you
Programs funding this kind of work almost always require the same thing: proof that a licensed contractor did the job to standard. That is where many applications fail, for want of documents in the right form.
In Québec every plumbing contractor must hold a Régie du bâtiment licence as soon as work is entrusted to someone other than the owner-occupant. We hold RBQ licence 5825-6405-01 and are CMMTQ members.
One piece of advice that prevents many refusals: get the municipal permit before starting. Several programs exclude an installation done without one outright, however sound the work.
- An itemised invoice separating the part from the labour — a lump sum is often refused.
- The contractor’s RBQ licence number, and CMMTQ membership where required.
- Evidence the installation meets current standards.
- Photos of the work, before and after — some cities ask for them.
- The municipal permit, obtained BEFORE the work begins.
Verify before committing the expense
The amounts and conditions on this page were read at source on 22 September 2026. These programs are revised, enhanced or closed without notice, and a stale figure on a web page gives you no recourse.
Always confirm two things before ordering the part: that the program is open when you do the work, and that your situation meets the criteria. The links below lead to the official sources.
If you are unsure what applies where you live, call us. We know the requirements of the municipalities we serve, and we can tell you what to ask your city before going further.