On September 13, 1975, any proceeding that establishes or alters the boundaries of a governmental subdivision previously or hereafter initiated and purported to be effected in accordance with applicable legal requirements shall be conclusively presumed valid for all purposes one year after the purported effective date of the action. No direct or collateral attack on the action may thereafter be commenced. This statute of limitations includes but is not limited to the following proceedings:

(1) Formations and change of organizations under ORS § 198.705 to 198.955.

(2) Boundary changes under ORS § 199.410 to 199.519.

(3) Consolidations under ORS § 199.705 to 199.795.

(4) Incorporations under ORS § 221.010 to 221.090.

(5) Annexations under ORS § 222.111 to 222.180, 222.750 and 222.840 to 222.915.

(6) Consolidations under ORS § 222.210 to 222.310.

(7) Withdrawals and transfers of territory under ORS § 222.510 to 222.580.

(8) Mergers under ORS § 222.610 to 222.710.

(9) Formations and changes under ORS Chapter 261.

(10) Alterations, changes, mergers and consolidations under ORS § 330.080 to 330.123, 330.505 to 330.780 (1989 Edition) and 335.490 to 335.505.

(11) Alterations, changes, mergers and consolidations under ORS Chapter 333 commenced before July 1, 2003.

(12) Formations and boundary changes under ORS § 341.025 to 341.125 and 341.565 to 341.575.

(13) Organizations and boundary changes under ORS § 545.002 and 545.025 to 545.043, 545.051 to 545.105, 545.109, 545.123, 545.126 and 545.131.

(14) Formations and boundary alterations under ORS § 547.005 to 547.060 and 547.250 to 547.260.

(15) Formations and organizations under ORS Chapter 551. [1975 c.326 § 2; 1991 c.167 § 1; 1999 c.452 § 29; 2003 c.226 § 20; 2005 c.209 § 1]

12.270 was enacted into law by the Legislative Assembly but was not added to or made a part of ORS Chapter 12 by legislative action. See Preface to Oregon Revised Statutes for further explanation.