Basement flooding in Windsor is a recent memory, not a distant risk. In September 2016, flooding led to a state of emergency in Windsor and Tecumseh, and the City received reports of 700 flooded homes and businesses. Then the rainstorm of August 29, 2017 flooded about 6,000 basements, according to CBC. That history is why the City runs a Basement Flooding Protection Subsidy Program, with a lifetime maximum per property and approval on a first-come, first-served basis. When you hire for a backwater valve, sump pump or drain work, the programme rules shape the job. You must apply and get approval before any work starts, and the work must be done by a City of Windsor Licensed Plumber, followed by a final inspection that passes. Work you do yourself, or work started before approval, is not eligible. Ask any trade whether they hold that licence, whether the quote names the specific item in the programme, and who arranges the inspection.
Source: CBC News (source, opens in a new tab)