If water mains have been extended or installed in accordance with a plan substantially similar to that contemplated by section 5, the township board, subject to provisions of any contract that has been made with another township or a city, village, or authority for furnishing water through the mains, has exclusive governing control over the mains and fittings and their maintenance and use. In such cases, the township board may promulgate and adopt, by resolution, rules and regulations conforming substantially with section 5(d). The rules and regulations become effective on completion of their publication, at full length, once each week for 3 successive weeks in a newspaper circulating within the township in which the improvement has been made. After the rules and regulations become effective, they may be amended or altered by the township board only after notice of its intention to do so, specifying the date, hour, and place of meeting of the board for this purpose, is published for 3 successive weeks in a newspaper circulating within the township.