Cal. Gov. Code § 53060.5
The term "district," as used in this section, means a district, public authority, public agency, and any other political subdivision or public corporation in the state, but does not include the state or a county, city and county, or city.
Any district, directly or through a representative, may attend the Legislature or any other legislative body, including Congress, and any committees thereof and present information to aid the passage of legislation which the district deems beneficial to the district or to prevent the passage of legislation which the governing board of the district deems detrimental to the district. The cost and expense incident thereto are proper charges against the district. Such districts may enter into and provide for participation in the business of associations and through a representative of the associations attend the Legislature, or any other legislative body, including Congress, and any committees thereof, and present information to aid the passage of legislation which the association deems beneficial to the districts in the association, or to prevent the passage of legislation which the association deems detrimental to the districts in the association. The cost and expense incident thereto are proper charges against the districts comprising the association.
Each member of the district board engaging in such activities on behalf of the district shall be allowed eleven cents ($0.11) per mile, without any constructive mileage, for his expenses of traveling necessarily done by automobile, and his actual traveling expenses when he travels by public conveyance.
Ca. Gov. Code § 53060.5