For the purpose of promoting public health and in order to protect the dental health of Virgin Islands residents, particularly children, through prevention of tooth decay, any governmental agency or instrumentality, persons, firm or corporation having responsibility for the production and/or distribution of fresh water for public consumption or for consumption in the schools, whether publicly or privately owned or operated, shall control the quantity of fluoride in the water so produced and/or distributed so as to maintain a fluoride content of not less than eight-tenths (0.8) of one milligram per liter nor more than one and two-tenths (1.2) milligrams per liter.