Oregon Constitution Art. XI § 14

(1) The Legislative Assembly shall provide by law a method whereby the legal electors of any metropolitan service district organized under the laws of this state, by majority vote of such electors voting thereon at any legally called election, may adopt, amend, revise or repeal a district charter.

(2) A district charter shall prescribe the organization of the district government and shall provide directly, or by its authority, for the number, election or appointment, qualifications, tenure, compensation, powers and duties of such officers as the district considers necessary. Such officers shall among them exercise all the powers and perform all the duties, as granted to, imposed upon or distributed among district officers by the Constitution or laws of this state, by the district charter or by its authority.

(3) A district charter may provide for the exercise by ordinance of powers granted to the district by the Constitution or laws of this state.

(4) A metropolitan service district shall have jurisdiction over matters of metropolitan concern as set forth in the charter of the district.

(5) The initiative and referendum powers reserved to the people by this Constitution hereby are further reserved to the legal electors of a metropolitan service district relative to the adoption, amendment, revision or repeal of a district charter and district legislation enacted thereunder. Such powers shall be exercised in the manner provided for county measures under section 10, Article VI of this Constitution.