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2022 Final Water Quality Assessment Monitoring Stations GISdataset. Biennially, DEQ must produce a Water Quality Assessment Integrated Report (IR) on the surface waters within the state\u2019s jurisdiction as mandated by the federal Clean Water Act (CWA) sections 303(d), 305(b), and 314 and the state\u2019s Water Quality Monitoring, Information, and Restoration Act (WQMIRA). This geographic layer is a component of the process used to supplement and support the assessment decisions made in the IR. Data from DEQ and non-DEQ contributors collected from Jan. 1 2015 through Dec. 31 2020 was used to characterize each applicable Assessment Unit (AU) within the Commonwealth. 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Display and define all surface waters of the commonwealth identified within the 2022 305(b)/303(d) Water Quality Assessment Integrated Report. The Assessment Unit (AU) dataset was created from United States Geological Survey (USGS) National Hydrography Dataset (NHD) high-resolution 1:24,000 data extracted in September 2012. The NHD product was used by DEQ regional assessment staff to assign previously established assessment unit IDs based on predetermined up- and downstream extents and applicable Water Quality Standards. 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