Administrative Rules of Montana
Department 17 - ENVIRONMENTAL QUALITY
Chapter 17.30 - WATER QUALITY
Subchapter 17.30.6 - Surface Water Quality Standards and Procedures
Rule 17.30.654 - E-3 CLASSIFICATION STANDARDS
Universal Citation: MT Admin Rules 17.30.654
Current through Register Vol. 6, March 22, 2024
(1) Waters classified E-3 are to be maintained suitable for agricultural purposes, secondary contact recreation, and wildlife..
(2) No person may violate the following specific water quality standards for waters classified E-3:
(a) the geometric mean number of Escherichia
coli bacteria may not exceed 630 colony forming units per 100 milliliters and
10 percent of the samples may not exceed 1,260 colony forming units per 100
milliliters during any 30-day period. Water quality criteria for Escherichia
coli are expressed in colony forming units per 100 milliliters of water or as
most probable number, which is a statistical representation of the number of
organisms in a sample, as incorporated by reference in
40 CFR
136.3(b); and
(b) the designated uses of a receiving water
body under a different classification must be fully maintained.
(3) The narrative standards in ARM 17.30.637(1) (d) and (2) that pertain to aquatic life do not apply.
AUTH: 75-5-301, MCA; IMP: 75-5-301, MCA
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