A district may, pursuant to the notice, protest, and hearing procedures in Section 53753 of the Government Code, fix, levy and collect a sewage and waste service standby or availability charge. If the procedures set forth in this section as it read at the time a standby charge was established were followed, the county board of supervisors may, by resolution, continue the charge pursuant to this section in successive years at the same rate. If new, increased, or extended assessments are proposed, the board shall comply with the notice, protest, and hearing procedures in Section 53753 of the Government Code.