California Code, Water Code - WAT § 74053

The petition shall be published once a week for at least three weeks before the presentation to the board of supervisors in some newspaper printed and published in the principal county, together with a notice stating the date of the meeting of the board at which the petition will be presented.

If any portion of the proposed district lies within another county, or counties, the petition and notice shall be likewise published in a newspaper printed and published in each of such counties.