 algae blooms happen naturally three things contribute to them the hot dry weather that we've had and the surplus of nutrients that's the fertilizer that we all use on our lawns so if there's too much of that it gets washed into the lake the lake is this standstill water and boom you get this algae it's that green blue or blue green algae that pops up right now they have it in very high concentrations and it's created a kind of a toxic microcystin