Cal. Wat. Code § 35520.43
No zone shall be established or varying rates of assessment fixed under Section 35520.42, unless the board, by resolution, declares that it intends to do so and that a public hearing will be held thereon at a specified time and place where all interested persons may appear and be heard.
Notice of the hearing shall be given by publishing a copy of the resolution in a newspaper of general circulation, published in each affected county, pursuant to Section 6066 of the Government Code, the first publication to be at least 14 days prior to the time fixed for the hearing. A copy of the resolution shall be mailed, postage prepaid, to each holder of title to land within the drainage service area as shown upon the last equalized assessment book of the distict at least 15 days prior to the time fixed for the hearing. Any error, omission, or mistake in the mailing, or any failure of any person to receive a copy, shall not invalidate the proceedings pursuant to this section.
The hearing may be adjourned from time to time at the discretion of the board, and, at its conclusion, the board shall determine the zones of benefit established, if any, the share of benefits received by each zone arising from the district's operation, expressed as a percentage, the criteria for establishing each zone, and the percentage expressed. A map of the drainage service area in such detail as to delineate the geographical area of each zone shall be a part of the resolution. The zones and the percentages may be amended from time to time or abolished in the same manner required for original adoption.
Ca. Water Code § 35520.43