ARSD 74:51:01:50. Criteria for immersion recreation waters

The criteria of parameters for immersion recreation waters and their allowable variations that are not included under § 74:51:01:55 and Appendix B, unless set under § 74:51:01:24, are as found in the following table and only apply May 1 - September 30: Parameter Criteria Unit of Measure Special Conditions Dissolved oxygen as measured anywhere in the water column of a non-stratified water body, or in the epilimnion and metalimnion of a stratified water body > 5.0 mg/L daily minimum Escherichia coli < 126 /100 mL geometric mean based on a minimum of 5 samples obtained during separate 24-hour periods for any 30-day period < 235 in any one sample Microcystin 8 µg/L Not to be exceeded in more than three 10-day assessment periods over the course of the recreation season Cylindrospermopsin 15 µg/L