Lead is a toxic metal found in natural deposits. It can be found in air, soil, dust, food, and water. Lead was commonly used in household plumbing materials and water service lines until 1986. The National Plumbing Code allowed lead as an acceptable material for pipes until 1975 and in solder until 1986. All provinces and territories use the National Plumbing Code as a basis for their own regulations. Regulations regarding lead used in plumbing materials were phased in across the country. Therefore, the timing of when lead service lines and other lead-based plumbing materials stopped being used may differ depending on where you live.