As used in ORS § 543.650 to 543.685, unless the context requires otherwise:

(1) ‘District’ means any one of the following:

(a) A domestic water supply district organized under ORS Chapter 264.

(b) An irrigation district organized under ORS Chapter 545.

(c) A drainage district organized under ORS Chapter 547.

(d) A water improvement district organized under ORS Chapter 552.

(e) A water control district organized under ORS Chapter 553.

(2) ‘Principal Act’ means the statutes, other than ORS § 543.650 to 543.685, which describe the powers of a district, including, but not limited to, the statutes under which a district is proposed or is operating.

(3) ‘Water system’ means any structure or facility constructed by persons and used by a district to achieve the district’s purpose under the district’s principal Act whether or not such structure or facility is owned by the district. [1981 c.420 § 2; 1985 c.561 § 4]