"Pollution" shall mean an impairment or alteration of the quality, including the potability and palatability, of waters of the County to a degree which unreasonably affects the beneficial uses of such waters. "Pollution" may include contamination. (§ 1, Ord. 765, eff. October 7, 1976; as amended by § 3, Ord. 1470, eff. July 14, 2016)