If you experience a sewer back up, be sure you or your plumber always contacts Ontario One Call before attempting to clear the line with any mechanical equipment
A network of power, natural gas, phone and cable lines, as well as water and sewer pipes may lie just under the surface of your property. In rare instances, a gas line is mistakenly installed within a sewer line, which is known as a cross bore.
If a cross bore is struck while a sewer backup is being cleared, it could cause natural gas to leak into your property or the sewer system, potentially leading to personal injury or an explosion.
In the United States, there have been cases of home explosions, fire, injury and death due to natural gas leaks from cross bores. While no instances have taken place in Canada, there have been cross bores detected in Ontario.