posted 2 years ago
In Canada much like States in the US, Provinces govern the use of rain/snow water collection. On a commercial scale there might be some issues that you will encounter. This Wikepedia blurb is about residential use It might require some poking about for commercial regs. Rainwater at some point is what recharges aquifers and is one of the reasons where I live creating a pond for rainwater retention is a no-no.
" Ontario
In Ontario, the province permits the use of rainwater for flushing toilets and urinals, as well as for sub-surface and below ground irrigation systems.[7] A large number of standards and regulations have been put in place regarding catchments, conveyance networks, and storage containers in Ontario Guidelines for Residential Rainwater Harvesting Systems.[7] Since the temperature during winter months in Ontario drops below zero, rainwater is at a high risk of freezing. Therefore, the province of Ontario places a strong significance on guidelines to ensure that rainwater is in a controlled temperature environment. In addition, to avoid freezing in the pipe network, the water must be properly controlled via draining and temperature controls.[7] Various systems and scenarios have been outlined regarding overflow management, pressurization, and back-flow prevention.[7]"
Our inability to change everything should not stop us from changing what we can.