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

Source: SL 1975, ch 16, § 1; 4 SDR 32, effective December 4, 1977; transferred from § 34:04:02:40, effective July 1, 1979; 10 SDR 145, effective July 4, 1984; 13 SDR 129, 13 SDR 141, effective July 1, 1987; 19 SDR 111, effective January 31, 1993; transferred from § 74:03:02:40, July 1, 1996; 24 SDR 10, effective July 20, 1997; 35 SDR 253, effective May 12, 2009; 42 SDR 103, effective January 19, 2016 ; 47 SDR 110, effective April 27, 2021 .

General Authority: SDCL 34A-2-10, 34A-2-11, 34A-2-93.

Law Implemented: SDCL 34A-2-10 , 34A-2-11.

Prior versions effective: 2016-01-19, 2009-05-12.