(a) The recreational human health criteria to protect swimming and other recreation in and on the water from excessive microcystin and cylindrospermopsin toxins shall be as follows:
- (1) Microcystin shall not exceed 8 μg/L in 3 or more 10-day periods during a calendar 12-month period; or
- (2) Cylindrospermopsin shall not exceed 15 μg/L in 3 or more 10-day periods during a calendar 12-month period.
- (b) The values in (a)(1) and (2) shall be concentrations not to be exceeded more than once in 5-years.
- (c) Other cyanotoxins shall be evaluated based on known health risks and potential for cyanotoxin production and accumulation.
Source. (See Revision Notes #1, #2, and #3 at chapter heading for Env-Wq 1700) #12042, eff 12-1-16 New. #14203, eff 2-26-25