CAL. GOV. CODE § 12955 : California Code - Section 12955

It shall be unlawful:

(a) For the owner of any housing accommodation to discriminate against or harass any person because of the race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, marital status, national origin, ancestry, familial status, source of income, disability, or genetic information of that person.

(b) For the owner of any housing accommodation to make or to cause to be made any written or oral inquiry concerning the race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, marital status, national origin, ancestry, familial status, disability, or genetic information of any person seeking to purchase, rent, or lease any housing accommodation.

(c) For any person to make, print, or publish, or cause to be made, printed, or published any notice, statement, or advertisement, with respect to the sale or rental of a housing accommodation that indicates any preference, limitation, or discrimination based on race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, marital status, national origin, ancestry, familial status, source of income, disability, or genetic information or an intention to make that preference, limitation, or discrimination.

(d) For any person subject to the provisions of Section 51 of the Civil Code, as that section applies to housing accommodations, to discriminate against any person on the basis of sex, gender, gender identity, gender expression, sexual orientation, color, race, religion, ancestry, national origin, familial status, marital status, disability, genetic information, source of income, or on any other basis prohibited by that section. Selection preferences based on age, imposed in connection with a federally approved housing program, do not constitute age discrimination in housing.

(e) For any person, bank, mortgage company or other financial institution that provides financial assistance for the purchase, organization, or construction of any housing accommodation to discriminate against any person or group of persons because of the race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, marital status, national origin, ancestry, familial status, source of income, disability, or genetic information in the terms, conditions, or privileges relating to the obtaining or use of that financial assistance.

(f) For any owner of housing accommodations to harass, evict, or otherwise discriminate against any person in the sale or rental of housing accommodations when the owner's dominant purpose is retaliation against a person who has opposed practices unlawful under this section, informed law enforcement agencies of practices believed unlawful under this section, has testified or assisted in any proceeding under this part, or has aided or encouraged a person to exercise or enjoy the rights secured by this part. Nothing herein is intended to cause or permit the delay of an unlawful detainer action.

(g) For any person to aid, abet, incite, compel, or coerce the doing of any of the acts or practices declared unlawful in this section, or to attempt to do so.

(h) For any person, for profit, to induce any person to sell or rent any dwelling by representations regarding the entry or prospective entry into the neighborhood of a person or persons of a particular race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, marital status, ancestry, disability, genetic information, source of income, familial status, or national origin.

(i) For any person or other organization or entity whose business involves real estate-related transactions to discriminate against any person in making available a transaction, or in the terms and conditions of a transaction, because of race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, marital status, national origin, ancestry, source of income, familial status, disability, or genetic information.

(j) To deny a person access to, or membership or participation in, a multiple listing service, real estate brokerage organization, or other service because of race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, marital status, ancestry, disability, genetic information, familial status, source of income, or national origin.

(k) To otherwise make unavailable or deny a dwelling based on discrimination because of race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, familial status, source of income, disability, genetic information, or national origin.

(l) To discriminate through public or private land use practices, decisions, and authorizations because of race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, familial status, marital status, disability, genetic information, national origin, source of income, or ancestry. Discrimination includes, but is not limited to, restrictive covenants, zoning laws, denials of use permits, and other actions authorized under the Planning and Zoning Law (Title 7 (commencing with Section 65000)), that make housing opportunities unavailable.

Discrimination under this subdivision also includes the existence of a restrictive covenant, regardless of whether accompanied by a statement that the restrictive covenant is repealed or void.

(m) As used in this section, "race, color, religion, sex, gender, gender identity, gender expression, sexual orientation, marital status, national origin, ancestry, familial status, source of income, disability, or genetic information," includes a perception that the person has any of those characteristics or that the person is associated with a person who has, or is perceived to have, any of those characteristics.

(n) To use a financial or income standard in the rental of housing that fails to account for the aggregate income of persons residing together or proposing to reside together on the same basis as the aggregate income of married persons residing together or proposing to reside together.

(o) In instances where there is a government rent subsidy, to use a financial or income standard in assessing eligibility for the rental of housing that is not based on the portion of the rent to be paid by the tenant.

(p) (1) For the purposes of this section, "source of income" means lawful, verifiable income paid directly to a tenant or paid to a representative of a tenant. For the purposes of this section, a landlord is not considered a representative of a tenant.

(2) For the purposes of this section, it shall not constitute discrimination based on source of income to make a written or oral inquiry concerning the level or source of income.