The drinking water supply in the city of Cambridge has higher levels of sodium than recommended by Health Canada according to regular water quality reports taken by the region. The Region of Waterloo website states that regular sodium levels in drinking water should be below 20 mg/L. Anything higher must be reported to public health. A major cause of the increase is the way roads are treated and the type of salt that is used over the winter months. It's an issue the region is working on.