Mont. Code Ann. § 76-7-106
Conveyance or lease of environmental control sites
76-7-106 . Conveyance or lease of environmental control sites. (1) A grantee of an environmental control easement acquired under this chapter may not convey or assign any of the easement rights that the grantee has acquired except to a federal public entity, a public body, or a qualified private organization authorized to hold environmental control easements under 76-7-204 .
(2) A grantee of a conveyance pursuant to subsection (1) shall assume the responsibility for enforcing the environmental control easement as specified in the easement instrument and in 76-7-211 .