Cal. Water Code § 35520.10

The board shall file a copy of the roll and report in its records and forthwith give notice of the filing of the report and assessment roll by publication at least once a week for two successive weeks in a newspaper of general circulation published in each affected county, and by mailing copies of the notice to each affected landowner, as shown on the last equalized assessment book of the district or as is otherwise known to the district, stating therein the time and place of a special meeting which shall be not less than 15 days after the completion of publication and mailing at which meeting all interested persons, including all persons owning land in the district or in the affected drainage service area, may appear and be heard concerning any matter set forth in the roll and report.