The owners and/or developers of all parcels of land annexed to the city shall be individually and/or jointly responsible for the installation of all necessary sewers, storm drainage facilities, street improvements, bridges, culverts and other public facilities as required by the city for the general public welfare and for proper annexed area development. The city will not participate financially in any such development or public facility construction except where extension of relief sewers incidentally aid annexed area development. (Prior code § 7026)