As used in this Article, unless otherwise apparent from the context, the following words shall mean:

Contamination, pollution and nuisance. Meanings ascribed to them by Section 13050 of the Water Code.

Health Officer. The health officer or the director of health services of the county or the authorized representative of either of them.

Well or water well. Any artificial excavation constructed by any method for the purpose of extracting water from or injecting water into the underground. This definition shall not include oil and gas wells or geothermal wells constructed under the jurisdiction of the department of conservation, except those wells converted to use as water wells; or wells used for the purpose of dewatering excavation during construction or stabilizing hillsides or earth embankments.