The criteria of parameters for domestic water supply 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:

Parameter

Criteria

Unit of Measure

Special Conditions

Total dissolved solids

< 1,000

mg/L

30-day average

< 1,750

mg/L

daily maximum

Nitrates as N

< 10

mg/L

daily maximum

pH

> 6.5 - < 9.0

units

Total Coliform

< 5,000

/100 mL

geometric mean of a minimum of 5 samples during separate 24-hour periods for a 30-day period and may not exceed this value in more than 20 percent of the samples examined in the same 30-day period

< 20,000

/100 mL

in any one sample

Barium

< 1.0

mg/L

daily maximum

Chloride

< 250

mg/L

30-day average

< 438

mg/L

daily maximum

Fluoride

< 4.0

mg/L

daily maximum

Sulfate

< 500

mg/L

30-day average

< 875

mg/L

daily maximum

Total Petroleum Hydrocarbons

< 1.0

mg/L

daily maximum

Source: SL 1975, ch 16, § 1; 4 SDR 32, effective December 4, 1977; transferred from § 34:04:02:33, effective July 1, 1979; 10 SDR 145, effective July 4, 1984; 13 SDR 129, 13 SDR 141, effective July 1, 1987; 14 SDR 86, effective December 24, 1987; 19 SDR 111, effective January 31, 1993; transferred from § 74:03:02:33, July 1, 1996; 24 SDR 10, effective July 20, 1997; 35 SDR 253, effective May 12, 2009 ; 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: 2009-05-12.