California Code, Water Code - WAT § 13881

(a) “Department” means the Department of Water Resources.

(b) “Domestic water system” means a system for the provision to the public of piped water for human consumption, if such system has at least 15 service connections or regularly supplies water to at least 25 individuals.  Such term includes any water supply, treatment, storage, and distribution facilities under the control of the operator of such system.

(c) “Fund” means the California Safe Drinking Water Fund created pursuant to Section 13859.

(d) “Project” means proposed facilities for the construction, improvement, or rehabilitation of the domestic water system, and may include water supply, treatment works, and all or part of a water distribution system, if such inclusions are necessary to carry out the purpose of this chapter.

(e) “Public agency” means any city, county, district, or other political subdivision of the state which owns or operates a domestic water system.

(f) “Treatment works” means any devices or systems used in the treatment of water supplies, including necessary lands, which render such supplies pure, wholesome, and potable for domestic purpose.