ARM 17.30.657. F-1 CLASSIFICATION STANDARDS

(1) Waters classified F-1 are to be maintained suitable for secondary contact recreation, wildlife and aquatic life not including fish. (2) No person may violate the following specific water quality standards for waters classified F-1: (a) the aquatic life standards for priority pollutants listed in DEQ-7; (b) the aquatic life standards for ammonia and other non-priority pollutants listed in DEQ-7, unless those standards are modified or removed based upon a use attainability analysis developed for a specific water body; (c) the designated uses of a receiving water body under a different classification must be fully maintained; (d) 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.