SLP, it occurs in most lakes just not at the harmful levels they prescribe to give warning. The elevated level can be caused by many factors. Mainly nutrient over load which can be from improperly functioning sewer systems adjacent to the lake or in the water shed, livestock runoff, fertilization of farms and yards and recreational lake users relieving themselves in the lake. The heavy rains we had with the ground already saturated caused runoff to carry some to the lake in higher amounts and before it had time to be bacterially reduced. But I have to say Snookman hits on a interesting question, why is a US agency using the World Health Org's standards within a State? We do pay taxes to fund the EPA, US Dept of Health, NOAA and the CDC plus others on the Federal level who generally claim to be the authority and in addition the State has an equal number of agencies funded, claiming the same powers. Snookman heres a question to ask them and make their head spin. If a US Government Agency acts in a manner to appear to be directed by a Foreign entity, the WHO, a branch of the UN and that agency is the US Army and they perform this act within a State of the Union, wouldn't that be Unconstitutional and being the US Army shouldn't the one giving the order be charged with Treason? Now I'm dizzy, need to go catch some of those Blue Green Bass.