For the purpose of promoting public health through prevention of tooth decay, the person, firm, corporation, or municipality having jurisdiction over a municipal water supply, whether publicly or privately owned or operated, shall control the quantities of fluoride in the water so as to maintain a fluoride content prescribed by the state commissioner of health. In the manner provided by law, the state commissioner of health shall promulgate rules relating to the fluoridation of public water supplies which shall include, but not be limited to the following: (1) the means by which fluoride is controlled; (2) the methods of testing the fluoride content; and (3) the records to be kept relating to fluoridation. The state commissioner of health shall enforce the provisions of this section. In so doing the commissioner shall require the fluoridation of water in all municipal water supplies on or before January 1, 1970. The state commissioner of health shall not require the fluoridation of water in any municipal water supply where such water supply in the state of nature contains sufficient fluorides to conform with the rules of such commissioner.