The following is information from the State Health Department on lead in drinking water. Further details can be found at https://doh.sd.gov.
Lead may work its way into drinking water after the water enters the distribution system and is on its way to consumer's taps. This usually happens through the corrosion of materials containing lead in household plumbing. These materials include brass faucets, lead solder on copper pipes, lead pipes or lead service lines connecting the water main to the indoor plumbing. You cannot see, taste, or smell lead in drinking water. The best way to know your risk of exposure to lead in drinking water is to identify the potential sources of lead in your service line and household plumbing. Taking action to get your water tested will help you reduce the exposure and improve health outcomes. Lead is harmful to heath, especially for children.
EPA banned the use of solder used to in copper plumbing in June of 1986. In January 2014, EPA enacted their Lead Free Act banning the use of lead in all plumbing fixtures and service lines used to deliver potable drinking water. If your residence was built after either of these dates, the risk of lead exposure from your household plumbing is reduced.
In South Dakota and nationally, there are efforts to determine whether lead was used in the service line to your home.
What can I do to reduce my exposure to lead in drinking water? Since lead exposure in drinking water typically comes from your plumbing fixtures and not the source of your water supply, unless you know your service line and plumbing fixtures are lead-free, it's important for both public drinking water customers as well as private well water users to follow these tips to reduce your exposure to lead.
EPA has set the maximum contaminant level goal for lead in drinking water at zero because lead is a toxic metal that can be harmful to human health even at low exposure levels. The maximum contaminant level is a goal, but the action level for EPA is 15 parts of lead per billion parts of water (ppb) for public water systems. At 15 ppb or greater, a public water system must take action to reduce the amount of lead in the water distributed to the customer.
Young children, infants and fetuses are particularly vulnerable to lead because the physical and behavioral effects of lead occur at lower exposure levels in children than in adults. Even low levels of exposure have been linked to damage to the central and peripheral nervous system, learning disabilities, shorter stature, impaired hearing, and impaired formation and function of blood cells.