Addressing Lead in Drinking Water: The Lead and Copper Rule Revisions (LCRR) [Updated June 22, 2021] [open pdf - 1MB]
From the Summary: "Lead's adverse health effects--especially for children, even at low levels of exposure--have driven continuing efforts to reduce lead exposure through drinking water. Primarily, lead enters drinking water after leaving the treatment plant, when lead may leach into water from plumbing materials or pipes. Accordingly, controlling corrosion of plumbing and pipes has been the principal method used to keep lead from entering public water supplies. Congress has used several approaches under the Safe Drinking Water Act (SDWA) to limit lead in drinking water. These approaches include limiting the lead content of plumbing materials and fixtures; establishing public notification and education requirements; authorizing the U.S. Environmental Protection Agency (EPA) to regulate contaminants in public water supplies; and authorizing grant programs for lead reduction projects, testing for lead in water at schools and child care programs, and removing lead-lined drinking water coolers from schools. Using SDWA authorities, EPA developed the 1991 Lead and Copper Rule (LCR). The LCR is unlike most drinking water regulations. It does not include a health-based standard (i.e., maximum contaminant level [MCL]); rather, the rule established a treatment technique and 'action' levels."
CRS Report for Congress, R46794
Congressional Research Service: https://crsreports.congress.gov/