Canadian Forest Service Publications
Occurrence of glyphosate in surface waters of southern Ontario. 2008. Struger, J.; Thompson, D.G.; Staznik, B.; Martin, P.; McDaniel, T.; Marvin, C. Bulletin of Environmental Contamination and Toxicology 80: 378 - 384.
Issued by: Great Lakes Forestry Centre
Catalog ID: 28657
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Glyphosate in surface waters of southern Ontario (Canada) was studied over a 2-year period. A small percentage of samples exhibited glyphosate concentrations greater than the analytical limit of quantitation (17 mug a.e./L), and the maximum concentration of glyphosate measured was 40.8 mug/L. No samples of roughly 500 analyzed exceeded the Canadian Water Quality Guideline of 65 mug a.e./L considered protective of aquatic life. Typical concentrations of glyphosate in amphibian habitats were well below a range of toxicity thresholds for aquatic organisms, and were thus judged to be unlikely to pose a substantial risk to either sensitive amphibian larvae or other aquatic biota.