A. For the purposes of Section 1001 et seq. of this title, the term "public agency" shall mean:

1. Any political subdivision of this state;

2. Any agency of the state government or of the United States;

3. Each and every public trust of this state regardless of whether the beneficiary of such trust is a municipality, a county, or the State of Oklahoma, except the Oklahoma Ordnance Works Authority;

4. Any corporation organized not for profit pursuant to the provisions of the Oklahoma General Corporation Act, Section 1001 et seq. of Title 18 of the Oklahoma Statutes, for the primary purpose of developing and providing rural water supply and sewage disposal facilities to serve rural residents or to provide community-based services or assistance to clients of the Department of Mental Health and Substance Abuse Services as provided in Section 2-106 of Title 43A of the Oklahoma Statutes;

5. Any political subdivision of another state; and

6. Any city-county health department created pursuant to Section 1-210 of Title 63 of the Oklahoma Statutes.

B. The term "state" shall mean a state of the United States and the District of Columbia.