The Washington Post has reported on the deterioration of many lakes in the USA because of high nutrient loads transferred from surrounding agricultural land.
The headline reads:
Polluted farm runoff linked to toxic green algae slime in U.S. waters
The article was based on findings documented here by the National Wildlife Federation.
Remember: The Sylvan Lake Total Phosphorus (TP) analysis is close to the limit of the meso-eutrophic guideline:
Visit the Toxic Algae News web page to see the scope of the problem in the USA during the 2013 summer.
ASWQG means: Alberta Surface Water Quality Guideline