Public-supply water withdrawals in Puerto Rico have been compiled annually since 2014 as part of an ongoing effort between the Puerto Rico Aqueduct and Sewer Authority and the U.S Geological Survey. In 2020, the total amount of public-supply water withdrawn in Puerto Rico was estimated at 602 million gallons per day (Mgal/d) from freshwater sources. Surface-water withdrawals accounted for 537 Mgal/d (89 percent) and groundwater withdrawals accounted for 65 Mgal/d (11 percent). Population served by public-supply water systems accounted for 3.3 million people, almost 100 percent of the total population. Public-supply water withdrawals were tabulated by municipality and by public water system.