Mercury concentrations have shown a maximum of eight parts per trillion prior to entering Lake Athabasca. The Alberta guideline, which is the most protective of any in North America, is 13 parts per trillion. To put it in perspective, one part per trillion is equivalent to one drop of detergent in enough water to fill a string of railroad tank cars 16 kilometers (10 miles) long. For arsenic, all of the samples collected since 1990 have been below provincial water guidelines. The province has been actively sampling traditional foods in the area (. wild meat) and found that arsenic.
