This dataset contains a list of licensed tile drainage contractors in Ontario who design and install agricultural tile drainage systems. These contractors hold a valid business license under the Agricultural Tile Drainage Installation Act, 1990 from the Ministry of Agriculture, Food and Agribusiness (OMAFA). Contractors with a business license must employ a licensed Class “A” machine operator and have licensed tile drainage machinery. Licenses are renewed annually (expire March 31), and the list is updated annually. The list is maintained by OMAFA and includes company names, contact names, addresses, telephone numbers, and emails.