In 1991, the U.S. Environmental Protection Agency (EPA) published a regulation under the Safe Drinking Water Act to control lead and copper in drinking water, referred to as the Lead and Copper Rule (LCR). The Rule was created to protect public health by minimizing lead and copper levels in drinking water, primarily by reducing water corrosivity through corrosion control treatment. While implementation of the LCR has resulted in major improvements in public health, there is still much that needs to be done as research continues to show cities today see higher than normal levels of lead in their drinking water.