NEWS NOTES ON SUSTAINABLE WATER RESOURCES GAO Report on Drinking Water https://www.gao.gov/assets/700/694648.pdf ; US Government Accountability Office, Report to Congressional Committees, DRINKING WATER, Approaches for Identifying Lead Service Lines Should Be Shared with All States , September 2018, GAO-18-620. The crisis in Flint, Michigan, brought increased attention to lead in drinking water infrastructure. Lead in drinking water primarily comes from corrosion of service lines connecting the water main to a house or building. In 1991, EPA issued the Lead and Copper Rule that required water systems to conduct a “materials inventory” of lead service lines. In light of the events in Flint, EPA sent a letter to all states in February 2016 encouraging them to work with water systems to publicly post the materials inventory, along with any additional updated maps or inventories of lead service lines, actions the rule does not require. The total number of lead service lines is unknown and while national, state, and local estimates exist, approaches used to count lead service lines vary. A 2016 American Water Works Association study estimated that nationally there were 6.1 million lead service lines, but the study has significant sampling limitations and, as a result, likely does not accurately reflect the total number of lead service lines nationwide. In addition, at least two states, Massachusetts and Washington, published reports with estimates of lead service lines and reported 22,023 and 1,000-2,000 lead service lines as of 2016 and 2017, respectively. Certain water systems also have estimates, such as the approximately 7 percent of publicly owned lead service lines out of the area’s total number of service lines cited by a representative for the system serving Cincinnati, Ohio and surrounding areas, as of May 2018. This study will also be linked on the 2018 Reports Page 02 of the Sustainable Water Resources Site at https://sites.google.com/site/sustainablewaterresources/ ">https://sites.google.com/site/sustainablewaterresources/ ; Tim SmithSustainable Water Resources CoordinatorGovernment Web Site, https://acwi.gov/Sustainable Water Resources Site, https://sites.google.com/site/sustainablewaterresources/ ">https://sites.google.com/site/sustainablewaterresources/ ;