The U.S. Geological Survey (USGS) is conducting a Sources Sought Notice to identify firms capable of supplying pH buffer solutions, conductivity standards, and deionized water for the National Water Quality Laboratory (NWQL). These materials are essential for maintaining consistency in environmental water sampling and testing programs, which are critical for the USGS's monitoring of water quality trends across the nation. Interested firms must provide detailed information about their products, including compliance with the Buy American Act, and submit their responses by December 9, 2025, at 2:30 p.m. (MST) to Lisa Williams at ldwilliams@usgs.gov. This notice is for market research purposes only and does not constitute a request for proposals or guarantee a contract award.