ARM 17.30.655. E-4 CLASSIFICATION STANDARDS

(1) Waters classified E-4 are to be maintained suitable for aquatic life, agricultural purposes, secondary contact recreation, and wildlife. (2) No person may violate the following specific water quality standards for waters classified E-4: (a) the acute and chronic aquatic life standards in DEQ-7 apply; (b) the designated uses of a receiving water body under a different classification must be fully maintained; (c) the geometric mean number of Escherichia coli bacteria may not exceed 630 colony forming units per 100 milliliters and 10% of the samples may not exceed 1,260 colony forming units per 100 milliliters during any 30-day period.