This opportunity establishes a single-award Blanket Purchase Agreement (BPA) for the supply of acid vials containing pre-filled acid solutions for the USGS National Water Quality Laboratory to support water sampling and testing programs. The BPA will have a two-year period of performance from September 16, 2026 to September 15, 2028, with a maximum ordering limit of $350,000. Individual purchases will be made via firm-fixed-price call orders on an as-needed basis. This is a commercial acquisition under FAR Part 12 and is not a small business set-aside (NAICS 325199, size standard 1,250 employees). Offerors must have an active SAM.gov registration at the time of offer and award.