The commission is hereby authorized and empowered to promulgate rules and regulations to restrict the import, distribution, and sale of plumbing, appurtenances and materials which are not lead-free. In addition, such regulations shall prohibit the use of any pipe, solder, or flux which is not lead-free in the installation or repair of any public water system or any plumbing providing water for human consumption which is connected to or supplied by a public water system.