As the temperatures start dropping in the watershed, the microcystins' numbers come down.
32.3 ppb 12/04/18
Still 32.3 times higher than the World Health Organization's safe limit for human contact.
Due to recent manure dumping the microcystins are up from 23.3ppb on 11/27/18.
(Only Ohio location over 20ppb for the month of December.)
Ohio Health Dept has posted a
"No Contact" warning
for Grand Lake St. Marys.