Backwater valve in Niagara Falls: the Building Code and the 2026 permit fee.

The Ontario Building Code, not the WRAP program, is why a backwater valve is required at all. The City's own 2026 fee by-law, not the WRAP page, sets what the plumbing permit for this work costs.

What the Code requires, and what it does not

Article 7.4.6.4 requires a backwater valve wherever a fixture sits below street level, or, for a home on a public sanitary sewer, below the upstream sanitary manhole cover. That rule reaches most basement fixtures on a sewered Niagara Falls lot built to today's Code. For an existing, older home, nothing in the Building Code compels a retrofit: the Code attaches to construction and permitted plumbing work, not to a house standing untouched. That is the honest reason an older Niagara Falls home installs a backwater valve today: the WRAP rebate is the reason, not a Building Code order. The WRAP page's own rule that a property already fitted with a backwater valve is not eligible for that rebate item is a program rule, not a Code requirement.

Semi-detached homes need one valve per side

A normally open backwater valve may not serve more than one dwelling unit. A semi-detached property is two dwelling units on one lot, so each side needs its own valve; one valve cannot protect both halves. This is a Code requirement, not a WRAP-specific rule, and it is not stated on the main WRAP page.