21. (1) A person constructing a new well that is discontinued before completion of the well’s structural stage shall immediately abandon the well.  O. Reg. 372/07, s. 20. (2) The well purchaser of a new well that is dry shall immediately abandon the well unless the owner of the land on which the well is situated agrees in writing to maintain the well for future use as a well.  O. Reg. 372/07, s. 20. (3) The well owner shall immediately abandon the well if it is not being used or maintained for future use as a well.  O. Reg. 372/07, s. 20. (4) If a well produces mineralized water, the well owner shall immediately abandon the well.  O. Reg. 372/07, s. 20. (5) If a well produces water that is not potable, the well owner shall immediately abandon the well unless the well owner seeks the advice of and takes such measures directed by the local medical officer of health.  O. Reg. 372/07, s. 20. (6) If a well contains natural gas or other gas, the well owner shall immediately abandon the well unless measures are taken to manage the gas in a way that prevents any potential hazard.  O. Reg. 372/07, s. 20. (7) If a well permits any movement of natural gas, contaminants or other materials between subsurface formations, or between a subsurface formation and the ground surface, and the movement may impair the quality of any waters, the well owner shall immediately abandon the well unless measures are taken that prevent the movement at all times.  O. Reg. 372/07, s. 20. (8) If a well is constructed in contravention of any provision of this Regulation dealing with the location of wells, the methods and materials used in the construction of wells or the standards of well construction, the well owner shall immediately take steps to rectify the situation, but if those steps fail, the owner shall immediately abandon the well.  O. Reg. 372/07, s. 20. (9) The well owner shall ensure that measures taken pursuant to subsections (5) to (7) are functional at all times.  O. Reg. 372/07, s. 20. (10) Subsections (4) to (8) do not apply if the well owner has the written consent of the Director.  O. Reg. 372/07, s. 20. (11) Subsections (4) and (5) do not apply to a test hole or dewatering well.  O. Reg. 372/07, s. 20. (12) Subsections (4) and (5) do not apply to a well that, (a) is used or intended for use as a source of water for agriculture; and (b) is not used as a source of water for human consumption.  O. Reg. 372/07, s. 20. (13) The person abandoning the well shall retain the services of the holder of a well contractor licence, and shall ensure that the contract between them requires a well technician licensed to construct the type of well that is being abandoned to be used to abandon the well, unless, (a) the person who works on the abandonment of the well is the owner of the land or is a member of the owner’s household; (b) the person who works on the abandonment of the well is working without remuneration for another person on land owned by the other person or by a member of the other person’s household; (c) the person who works on the abandonment of the well holds a licence referred to in paragraph 1 of subsection 5 (1); or (d) the well is a test hole or dewatering well, the well is abandoned by a method that does not use powered equipment, and the person who works on the abandonment of the well is, (i) a person who holds a licence referred to in paragraph 5 of subsection 5 (1), or (ii) a person referred to in paragraph 1, 2 or 3 of section 1.0.3.  O. Reg. 372/07, s. 20.