The notice shall be published at least once a week for four consecutive weeks, commencing within 20 days of the date of issuance of the notice, in one or more newspapers of general circulation published in each county in which any part of the stream system is situated, and, within the same 20-day period, the notice shall be mailed to all persons known to the board who own land that appears to be riparian to the stream system or who divert water from the stream system.