Diversion appropriation and beneficial use of surface and groundwater in Montana requires a valid water right. New appropriations or changes in existing water rights require an application to be filed with the DNRC. Changes to existing rights may include alterations in place of use or point of diversion. Conversion of an existing water right from one use to another (e.g., irrigation to fish pond) require a change application. Water rights should be filed on small (<35 gpm), individual wells once the water is put to use.
Be sure to consult with DNRC before using new water or changing existing water rights/uses!
Contact: Montana Department of Natural Resources and Conservation
Water Resources Division, Water Rights Bureau
P.O. Box 201601
Helena, Montana 59620-1601
Phone: (406) 444-6610