PFOS, or perfluorooctanesulfonic acid, is a chemical agent that was used for a very long time in paints, varnishes, stain removers and fabric protectants. Whenever brushes or cleaning tanks and pails were emptied, some of the PFOS seeped into Canada's groundwater. These agents are lethal to animals and people if the amounts in blood serum are high enough. If you have bought some land in a rural area of the country, you should have both your soil and your water tested.
18 May 2017