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. Author manuscript; available in PMC: 2024 May 20.
Published in final edited form as: Sci Total Environ. 2024 Mar 9;924:171566. doi: 10.1016/j.scitotenv.2024.171566

Fig. 3.

Fig. 3.

Counties in the United States and U.S. territoriesa by Rural-Urban Continuum Codes (RUCC)b; counties covered by CDC’s National Wastewater Surveillance System (NWSS)c are shown by brighter colors: September 1, 2020 – December 31, 2022. Abbreviations: CDC, Centers for Disease Control and Prevention; RUCC, Rural-Urban Continuum Codes. a U.S. territories include Guam and Puerto Rico. b Data are from the U.S. Department of Agriculture (USDA) 2013 Urban-Rural Continuum Codes dataset: https://www.ers.usda.gov/data-products/rural-urban-continuum-codes/. RUCC is a classification from 0 to 9, with higher values indicating more rural counties. c Counties are considered to be covered by NWSS if they were served entirely or partially by one or more NWSS sampling site (i.e., at least 1 site serving the county collected at least 1 sample between September 1, 2020 and December 31, 2022). A site can serve all or part of a sewershed, which is the geographic area contributing wastewater to a sampling location. Sewersheds may cross county or state boundaries.