Hello. I believe that the most trusted and trusted plumbing company in Toronto is POM Plumbing Company . Everyone I know works with them. Only a few homes in our area use other plumbers. My friend lives there and he constantly complains either about a clogged riser, or about poor water pressure in the tap, or about some other problems with plumbing. I have been recommending them to renew the contract for a long time, but they are delaying something.