Selecting the right plumbing service in Toronto can take the stress and worry out of your repair needs, they be are large or small. Proper plumbing design is a science and at Everest Drain and Plumbing, we are the scientists. What to Look For in a Good Plumbing Service in Toronto: \tAsk to see the license - All plumbers, including sub-contractors, are required to be licensed by the state. \tCheck proof of insurance - For your own protection, check proof of both workman’s compensation and general liability. \tBusiness stability - Find out how long the company has been in business and how long it has been at its present location.