Mont. Code Ann. § 85-2-102

(1999)

Definitions

Unless the context requires otherwise, in this chapter, the following definitions apply:

(1) "Appropriate" means:

(a) to divert, impound, or withdraw (including by stock for stock water) a quantity of water;

(b) in the case of a public agency, to reserve water in accordance with 85-2-316;

(c) in the case of the department of fish, wildlife, and parks, to lease water in accordance with 85-2-436; or

(d) in the Upper Clark Fork River basin, to maintain and enhance streamflows to benefit the fishery resource in accordance with 85-2-439.

(2) "Beneficial use", unless otherwise provided, means:

(a) a use of water for the benefit of the appropriator, other persons, or the public, including but not limited to agricultural (including stock water), domestic, fish and wildlife, industrial, irrigation, mining, municipal, power, and recreational uses;

(b) a use of water appropriated by the department for the state water leasing program under 85-2-141 and of water leased under a valid lease issued by the department under 85-2-141;

(c) a use of water by the department of fish, wildlife, and parks pursuant to a lease authorized under 85-2-436; or

(d) a use of water to maintain and enhance streamflows to benefit the fishery resource in the Upper Clark Fork River basin as part of the Upper Clark Fork River basin instream flow pilot program authorized under 85-2-439.

(3) "Certificate" means a certificate of water right issued by the department.

(4) "Change in appropriation right" means a change in the place of diversion, the place of use, the purpose of use, or the place of storage.

(5) "Commission" means the fish, wildlife, and parks commission provided for in 2-15-3402.

(6) "Correct and complete" means that the information required to be submitted conforms to the standard of substantial credible information and that all of the necessary parts of the form requiring the information have been filled in with the required information.

(7) "Declaration" means the declaration of an existing right filed with the department under section 8, Chapter 452, Laws of 1973.

(8) "Department" means the department of natural resources and conservation provided for in Title 2, chapter 15, part 33.

(9) "Existing right" or "existing water right" means a right to the use of water that would be protected under the law as it existed prior to July 1, 1973. The term includes federal non-Indian and Indian reserved water rights created under federal law and water rights created under state law.

(10) "Ground water" means any water that is beneath the ground surface.

(11) "Late claim" means a claim to an existing right forfeited pursuant to the conclusive presumption of abandonment under 85-2-226.

(12) "Permit" means the permit to appropriate issued by the department under 85-2-301 through 85-2-303 and 85-2-306 through 85-2-314.

(13) "Person" means an individual, association, partnership, corporation, state agency, political subdivision, the United States or any agency of the United States, or any other entity.

(14) "Political subdivision" means any county, incorporated city or town, public corporation, or district created pursuant to state law or other public body of the state empowered to appropriate water. The term does not mean a private corporation, association, or group.

(15) "Salvage" means to make water available for beneficial use from an existing valid appropriation through application of water-saving methods.

(16) "State water reservation" means a water right created under state law after July 1, 1973, that reserves water for existing or future beneficial uses or that maintains a minimum flow, level, or quality of water throughout the year or at periods or for defined lengths of time.

(17) "Substantial credible information" means probable, believable facts sufficient to support a reasonable legal theory upon which the department should proceed with the action requested by the person providing the information.

(18) "Waste" means the unreasonable loss of water through the design or negligent operation of an appropriation or water distribution facility or the application of water to anything but a beneficial use.

(19) "Water" means all water of the state, surface and subsurface, regardless of its character or manner of occurrence, including but not limited to geothermal water, diffuse surface water, and sewage effluent.

(20) "Water division" means a drainage basin as defined in 3-7-102.

(21) "Water judge" means a judge as provided for in Title 3, chapter 7.

(22) "Water master" means a master as provided for in Title 3, chapter 7.

(23) "Watercourse" means any naturally occurring stream or river from which water is diverted for beneficial uses. It does not include ditches, culverts, or other constructed waterways.

(24) "Well" means any artificial opening or excavation in the ground, however made, by which ground water is sought or can be obtained or through which it flows under natural pressures or is artificially withdrawn. (Effective July 1, 2005)

85-2-102. (Effective July 1, 2005) . Definitions. Unless the context requires otherwise, in this chapter, the following definitions apply:

(1) "Appropriate" means:

(a) to divert, impound, or withdraw (including by stock for stock water) a quantity of water;

(b) in the case of a public agency, to reserve water in accordance with 85-2-316; or

(c) in the case of the department of fish, wildlife, and parks, to lease water in accordance with 85-2-436.

(2) "Beneficial use", unless otherwise provided, means:

(a) a use of water for the benefit of the appropriator, other persons, or the public, including but not limited to agricultural (including stock water), domestic, fish and wildlife, industrial, irrigation, mining, municipal, power, and recreational uses;

(b) a use of water appropriated by the department for the state water leasing program under 85-2-141 and of water leased under a valid lease issued by the department under 85-2-141; and

(c) a use of water by the department of fish, wildlife, and parks pursuant to a lease authorized under 85-2-436.

(3) "Certificate" means a certificate of water right issued by the department.

(4) "Change in appropriation right" means a change in the place of diversion, the place of use, the purpose of use, or the place of storage.

(5) "Commission" means the fish, wildlife, and parks commission provided for in 2-15-3402.

(6) "Correct and complete" means that the information required to be submitted conforms to the standard of substantial credible information and that all of the necessary parts of the form requiring the information have been filled in with the required information.

(7) "Declaration" means the declaration of an existing right filed with the department under section 8, Chapter 452, Laws of 1973.

(8) "Department" means the department of natural resources and conservation provided for in Title 2, chapter 15, part 33.

(9) "Existing right" or "existing water right" means a right to the use of water that would be protected under the law as it existed prior to July 1, 1973. The term includes federal non-Indian and Indian reserved water rights created under federal law and water rights created under state law.

(10) "Ground water" means any water that is beneath the ground surface.

(11) "Late claim" means a claim to an existing right forfeited pursuant to the conclusive presumption of abandonment under 85-2-226.

(12) "Permit" means the permit to appropriate issued by the department under 85-2-301 through 85-2-303 and 85-2-306 through 85-2-314.

(13) "Person" means an individual, association, partnership, corporation, state agency, political subdivision, the United States or any agency of the United States, or any other entity.

(14) "Political subdivision" means any county, incorporated city or town, public corporation, or district created pursuant to state law or other public body of the state empowered to appropriate water. The term does not mean a private corporation, association, or group.

(15) "Salvage" means to make water available for beneficial use from an existing valid appropriation through application of water-saving methods.

(16) "State water reservation" means a water right created under state law after July 1, 1973, that reserves water for existing or future beneficial uses or that maintains a minimum flow, level, or quality of water throughout the year or at periods or for defined lengths of time.

(17) "Substantial credible information" means probable, believable facts sufficient to support a reasonable legal theory upon which the department should proceed with the action requested by the person providing the information.

(18) "Waste" means the unreasonable loss of water through the design or negligent operation of an appropriation or water distribution facility or the application of water to anything but a beneficial use.

(19) "Water" means all water of the state, surface and subsurface, regardless of its character or manner of occurrence, including but not limited to geothermal water, diffuse surface water, and sewage effluent.

(20) "Water division" means a drainage basin as defined in 3-7-102.

(21) "Water judge" means a judge as provided for in Title 3, chapter 7.

(22) "Water master" means a master as provided for in Title 3, chapter 7.

(23) "Watercourse" means any naturally occurring stream or river from which water is diverted for beneficial uses. It does not include ditches, culverts, or other constructed waterways.

(24) "Well" means any artificial opening or excavation in the ground, however made, by which ground water is sought or can be obtained or through which it flows under natural pressures or is artificially withdrawn. (Effective July 1, 2009)

85-2-102. (Effective July 1, 2009) . Definitions. Unless the context requires otherwise, in this chapter, the following definitions apply:

(1) "Appropriate" means:

(a) to divert, impound, or withdraw (including by stock for stock water) a quantity of water; or

(b) in the case of a public agency, to reserve water in accordance with 85-2-316.

(2) "Beneficial use", unless otherwise provided, means:

(a) a use of water for the benefit of the appropriator, other persons, or the public, including but not limited to agricultural (including stock water), domestic, fish and wildlife, industrial, irrigation, mining, municipal, power, and recreational uses; or

(b) a use of water appropriated by the department for the state water leasing program under 85-2-141 and of water leased under a valid lease issued by the department under 85-2-141.

(3) "Certificate" means a certificate of water right issued by the department.

(4) "Change in appropriation right" means a change in the place of diversion, the place of use, the purpose of use, or the place of storage.

(5) "Correct and complete" means that the information required to be submitted conforms to the standard of substantial credible information and that all of the necessary parts of the form requiring the information have been filled in with the required information.

(6) "Declaration" means the declaration of an existing right filed with the department under section 8, Chapter 452, Laws of 1973.

(7) "Department" means the department of natural resources and conservation provided for in Title 2, chapter 15, part 33.

(8) "Existing right" or "existing water right" means a right to the use of water that would be protected under the law as it existed prior to July 1, 1973. The term includes federal non-Indian and Indian reserved water rights created under federal law and water rights created under state law.

(9) "Ground water" means any water that is beneath the ground surface.

(10) "Late claim" means a claim to an existing right forfeited pursuant to the conclusive presumption of abandonment under 85-2-226.

(11) "Permit" means the permit to appropriate issued by the department under 85-2-301 through 85-2-303 and 85-2-306 through 85-2-314.

(12) "Person" means an individual, association, partnership, corporation, state agency, political subdivision, the United States or any agency of the United States, or any other entity.

(13) "Political subdivision" means any county, incorporated city or town, public corporation, or district created pursuant to state law or other public body of the state empowered to appropriate water. The term does not mean a private corporation, association, or group.

(14) "Salvage" means to make water available for beneficial use from an existing valid appropriation through application of water-saving methods.

(15) "State water reservation" means a water right created under state law after July 1, 1973, that reserves water for existing or future beneficial uses or that maintains a minimum flow, level, or quality of water throughout the year or at periods or for defined lengths of time.

(16) "Substantial credible information" means probable, believable facts sufficient to support a reasonable legal theory upon which the department should proceed with the action requested by the person providing the information.

(17) "Waste" means the unreasonable loss of water through the design or negligent operation of an appropriation or water distribution facility or the application of water to anything but a beneficial use.

(18) "Water" means all water of the state, surface and subsurface, regardless of its character or manner of occurrence, including but not limited to geothermal water, diffuse surface water, and sewage effluent.

(19) "Water division" means a drainage basin as defined in 3-7-102.

(20) "Water judge" means a judge as provided for in Title 3, chapter 7.

(21) "Water master" means a master as provided for in Title 3, chapter 7.

(22) "Watercourse" means any naturally occurring stream or river from which water is diverted for beneficial uses. It does not include ditches, culverts, or other constructed waterways.

(23) "Well" means any artificial opening or excavation in the ground, however made, by which ground water is sought or can be obtained or through which it flows under natural pressures or is artificially withdrawn.

Opinions construing this section

22 opinions
2026 MT 34 Feb 24, 2026 Affirmed in part, reversed in part
Petrich Fam. & Melin v. T.U
Majority by Beth Baker · 5 to 0
Const. art. IX, § 3(4). Decreed rights, use rights, and filed appropriation rights are types of historical rights deemed existing water rights under the WUA. Section 85-2-102(13), MCA (“‘Existing right’ or ‘Existing water right’ means a right to the use of water that would be protected under the law as it existed prior to July 1, 1
2025 MT 1 Jan 2, 2025 Affirmed
Trout Unlimited v. DNRC
Majority by Jim Rice · 5 to 2 with 1 concurring
301(1), MCA. To “appropriate” water is “to divert, impound, or withdraw, including by stock for stock water, a quantity of water for a beneficial use.” Section 85-2-102(1)(a), MCA. In turn, “beneficial use” is defined as “a use of water for the benefit of the appropriator, other persons, or the public, including but not limited to
2025 MT 1 Jan 2, 2025 Affirmed
Trout Unlimited v. DNRC
Dissenting by Laurie McKinnon · 5 to 2 with 1 concurring
er only for a beneficial use” and “the application of water to anything but a beneficial use” is prohibited as unlawful “waste.” Sections 85-2-301(1), 85-2-102(27), MCA. The structure of the MWUA thus deems applications for water are either for beneficial use or impermissible waste. The MWUA was designed to provide for compreh
2024 MT 210 Sep 17, 2024 Reversed
Town of Kevin v. MT DNR&C
Majority by Mike McGrath · 5 to 0
s Ranch Corp., 2016 MT 348, ¶¶ 12, 34, 386 Mont. 121, 386 P.3d 952. Under the Montana Water Use Act (MWUA), a municipal use is one such “beneficial use.” Section 85-2-102(5)(a), MCA. ¶15 Municipalities are required to follow the same permitting and change of use processes under the MWUA as individual rights-holders. Section 85-2-302(1),
2024 MT 158 Jul 30, 2024 Affirmed
Bradley Livestock v. Fraser
Majority by Mike McGrath · 5 to 0
While the MWUA recognized “existing rights” as rights “to the use of water that would be protected under the law as it existed prior to July 1, 1973,” § 85-2-102(13), MCA, it required individuals claiming pre-1973 water rights to file them with the Department of Natural Resources and Conservation by April 30, 1982, “or be conc
Official Annotations archive.org, 1999 edition
History:
En. Sec. 3, Ch. 452, L. 1973
Amd. Sec. 1, Ch. 192, L. 1974
Amd. Sec. 1, Ch. 485, L. 1975
Amd. Sec. 1, Ch. 416, L. 1977
Amd. Sec. 7, Ch. 460, L. 1977
R.C.M. 1947, 89-867
Amd. Sec. 1, Ch. 327, L. 1979
Amd. Sec. 1, Ch. 552, L. 1979
Amd. Sec. 29, Ch. 697, L. 1979
Amd. Sec. 1, Ch. 573, L. 1985
Amd. Sec. 1, Ch. 658, L. 1989
Amd. Sec. 2, Ch. 28, L. 1991
Amd. Sec. 2, Ch. 308, L. 1991
Amd. Sec. 1, Ch. 543, L. 1991
Amd. Sec. 1, Ch. 805, L. 1991
Amd. Sec. 1, Ch. 370, L. 1993
Amd. Sec. 1, Ch. 629, L. 1993
Amd. Sec. 440, Ch. 418, L. 1995
Amd. Sec. 4, Ch. 487, L. 1995
Amd. Sec. 2, Ch. 497, L. 1997