ORS § 264.110
A domestic water supply district may be formed for the purpose of supplying inhabitants of the district with water for domestic purposes as provided by this chapter; and, in connection therewith, may supply, furnish and sell for any use any surplus water over and above the domestic needs of its inhabitants to persons living outside the district, or to other water districts, school districts or other local governments as defined in ORS 174.116. All railroad rights of way or improvements thereon or rolling stock moving thereover shall be excluded from districts organized after June 9, 1943, and for purposes of ORS 264.210 to 264.320, 264.410, 264.420, 264.430, 264.470 and this section shall not be considered as property within the boundaries of such districts, unless the owner of the railroad property expressly consents to its inclusion.
ORS 264.110