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DNRC Headquarters
1539 Eleventh Ave. Helena, MT 59601
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Stream Depletion Zones


The department has authority to designate a stream depletion zone within a closed basin to limit the amount of water used under the exceptions to permit requirements under 85-2-306, MCA, due to the availability of water for the protection of existing water rights. (85-2-102(23) and 85-2-380, MCA)

A petition may be filed by a municipality; county; conservation district; local water quality district formed under Title 7, chapter 13, part 45; or the owners of at least 15% of the flow rate of the surface water rights in the area estimated to be affected.  The petition must be filed with the department pursuant to 85-2-380, MCA, and there must exist a hydrogeologic assessment for the area where the stream depletion zone is proposed.