California Health and Safety Code § 116275

As used in this chapter: (a) “Contaminant” means any physical, chemical, biological, or radiological substance or matter in water. (b) “Department” means the state board. (c) “Primary drinking water standards” means: (1) Maximum levels of contaminants that, in the judgment of the state board, may have an adverse effect on the health of persons. (2) Specific treatment techniques adopted by the state board in lieu of maximum contaminant levels pursuant to subdivision (j) of Section 116365. (3) The monitoring and reporting requirements as specified in regulations adopted by the state board that pertain to maximum contaminant levels. (d) “Secondary drinking water standards” means standards that specify maximum contaminant levels that, in the judgment of the state board, are necessary to protect the public welfare. Secondary drinking water standards may apply to any contaminant in drinking water that may adversely affect the odor or appearance of the water and may cause a substantial number of persons served by the public water system to discontinue its use, or that may otherwise adversely affect the public welfare. Regulations establishing secondary drinking water standards may vary according to geographic and other circumstances and may apply to any contaminant in drinking water that adversely affects the taste, odor, or appearance of the water when the standards are necessary to ensure a supply of pure, wholesome, and potable water. (e) “Human consumption” means the use of water for drinking, bathing or showering, hand washing, oral hygiene, or cooking, including, but not limited to, preparing food and washing dishes. (f) “Maximum contaminant level” means the maximum permissible level of a contaminant in water. (g) “Person” means an individual, corporation, company, association, partnership, limited liability company, municipality, public utility, or other public body or institution, including the United States to the extent authorized by federal law. (h) “Public water system” means a system for the provision of water for human consumption through pipes or other constructed conveyances that has 15 or more service connections or regularly serves an average of at least 25 individuals daily at least 60 days out of the year. A public water system includes the following: (1) Any collection, treatment, storage, and distribution facilities under control of the operator of the system that are used primarily in connection with the system. (2) Any collection or pretreatment storage facilities not under the control of the operator that are used primarily in connection with the system. (3) Any water system that treats water on behalf of one or more public water systems for the purpose of rendering it safe for human consumption. (i) “Community water system” means a public water system that serves at least 15 service connections used by yearlong residents or regularly serves at least 25 yearlong residents of the area served by the system. (j) “Noncommunity water system” means a public water system that is not a community water system. (k) “Nontransient noncommunity water system” means a public water system that is not a community water system and that regularly serves at least 25 of the same persons over six months per year. ( l ) “Local health officer” means a local health officer appointed pursuant to Section 101000 or a local comprehensive health agency designated by the board of supervisors pursuant to Section 101275 to carry out the drinking water program. (m) “Significant rise in the bacterial count of water” means a rise in the bacterial count of water that the state board determines, by regulation, represents an immediate danger to the health of water users. (n) “State small water system” means a system for the provision of piped water to the public for human consumption that serves at least 5, but not more than 14, service connections and does not regularly serve drinking water 

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