Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 537.515

(1) “Altering” a well means the deepening, recasing, perforating, reperforating, the installation of packers or seals and other material changes in the design of the well.

(2) “Constructing” a well includes boring, digging, drilling or excavating and installing casing or well screens.

(3) “Converting” a well means changing the use of an existing well or hole not previously used to withdraw water such that the well or hole can be used to seek or withdraw water.

(4) “Geothermal fluid” means any ground water used for its thermal characteristics that is encountered in a well with a bottom hole temperature of less than 250 degrees Fahrenheit or any other fluid that is circulated within a well with a bottom hole temperature of less than 250 degrees Fahrenheit and used for its acquired thermal characteristics.

(5) “Ground water” means any water, except capillary moisture, beneath the land surface or beneath the bed of any stream, lake, reservoir or other body of surface water within the boundaries of this state, whatever may be the geological formation or structure in which such water stands, flows, percolates or otherwise moves.

(6) “Ground water reservoir” means a designated body of standing or moving ground water having exterior boundaries which may be ascertained or reasonably inferred.

(7) “Pollution” of ground water means any impairment of the natural quality of such ground water, however caused, including impairment by salines, minerals, industrial wastes, domestic wastes or sewage, whether indrafted directly or through infiltration into the ground water supply.

(8) “Public agency” means the United States or any agency thereof, the State of Oregon or any agency thereof or any county, city, district organized for public purposes or other public corporation or political subdivision of this state.

(9) “Well” means any artificial opening or artificially altered natural opening, however made, by which ground water is sought or through which ground water flows under natural pressure or is artificially withdrawn. “Well” does not include a temporary hole drilled for the purpose of gathering geotechnical ground water quality or ground water level information, a natural spring or a hole drilled for the purpose of:

(10) “Well drilling machine” means any power driven percussion, rotary, boring, digging or augering machine used in the construction of water wells.