Mont. Code Ann. § 7-13-142

The board of county commissioners is hereby authorized to apply for and receive from the federal government, on behalf of said metropolitan sanitary and/or storm sewer district, any money that may be appropriated by the congress for aiding in local public works projects. Likewise, the board may borrow from the federal government any funds available for assisting in the planning or financing of local public works projects and repay the same out of the money received from the tax levy provided for in this part.