Melissa L. Riskin 2024 <p><span>The U.S. Geological Survey </span><span>(USGS) National Water Quality </span><span>Network for surface water </span><span>(NWQN-SW) was established </span><span>in 2013 to develop long-term, </span><span>comparable assessments of </span><span>surface-water quality in support </span><span>of national, regional, state, and </span><span>local needs related to water-quality </span><span>management and policy. Waterquality </span><span>samples are collected </span><span>at each site and measured for a </span><span>variety of parameters. In 2023, </span><span>the NWQN-SW consisted of </span><span>109 sites, each of them paired </span><span>with a streamgage, operated by </span><span>the USGS or other agencies that </span><span>provide continuous information on </span><span>streamflow conditions. The waterquality </span><span>data and the streamflow </span><span>information from the NWQN-SW </span><span>is then used to assess the status </span><span>and trends of water-quality </span><span>conditions and potential impacts </span><span>on human and aquatic health.</span></p> application/pdf 10.3133/gip245 en U.S. Geological Survey The U.S. Geological Survey National Water Quality Network—Surface Water—2023 reports