California Code, Water Code - WAT § 13282

(a) If it appears that adequate protection of water quality, protection of beneficial uses of water, and prevention of nuisance, pollution, and contamination can be attained by appropriate design, location, sizing, spacing, construction, and maintenance of individual disposal systems in lieu of elimination of discharges from systems, and if an authorized public agency provides satisfactory assurance to the regional board that the systems will be appropriately designed, located, sized, spaced, constructed, and maintained, the discharges shall be permitted so long as the systems are adequately designed, located, sized, spaced, constructed, and maintained.

(b) An authorized public agency shall notify the regional board if the systems are not adequately designed, located, sized, spaced, constructed, and maintained.

(c) For purposes of this section, “authorized public agency” means a public agency authorized by a water quality control board and having authority to ensure that systems are adequately designed, located, sized, spaced, constructed, and maintained.