From the Document: "Communities may face a range of issues associated with aging water infrastructure, including elevated lead levels in tap water. Because of lead's toxicity, even at low levels, reducing lead exposures from drinking water and other sources remains a public health priority. Other sources of lead exposure include lead-based paint and contaminated soil and dust from deteriorated lead-based paint. [...] In 2015, EPA received recommendations for LCR [Lead and Copper Rule] revisions from the National Drinking Water Advisory Council (NDWAC). NDWAC recommendations included requiring all water systems to establish a proactive LSL [lead service lines] replacement program, noting that it would be costly and likely take decades to fully remove all LSLs. As such, NDWAC recognized corrosion control's importance and recommended that EPA revise the rule's action level and requirements for corrosion control treatment and monitoring, among other revisions. EPA published final Lead and Copper Rule Revisions, or LCRR, in the 'Federal Register' on January 15, 2021, with an effective date of March 16, 2021, which was extended until June 17, 2021. EPA also proposed to delay the rule's effective date to December 16, 2021. The LCRR revises the 1991 LCR, and retains for certain purposes the 1991 LCR's 15 ppb [parts per billion] lead action level. Among other changes, the LCRR also establishes a new lead 'trigger level' at 10 ppb, based on the 90th percentile of tap water samples."
CRS In Focus, IF11302
Congressional Research Service: https://crsreports.congress.gov/