Cal. Health & Saf. Code § 50106
"Extremely low income households" means persons and families whose incomes do not exceed the qualifying limits for extremely low income families as established and amended from time to time by the Secretary of Housing and Urban Development and defined in Section 5.603(b) of Title 24 of the Code of Federal Regulations. These limits shall be published by the department in the California Code of Regulations as soon as possible after adoption by the Secretary of Housing and Urban Development. In the event the federal standards are discontinued, the department shall, by regulation, establish income limits for extremely low income households for all geographic areas of the state at 30 percent of area median income, adjusted for family size and revised annually. As used in this section, "area median income" means the median family income of a geographic area of the state.
Ca. Health and Saf. Code § 50106