Haloacetic Acids in Canadian Lake Waters and Precipitation

Haloacetic acids (HAAs) were measured in lake water and precipitation in distinct geographical areas of Canada with the objective of determining prevailing levels and source regions of these phytotoxins. This included surface water samples from the Great Lakes and four lakes in widely separated geographical areas of Canada. These lakes had levels dependent on the degree of isolation from human activity, with the more isolated lakes having HAA concentration generally of