A solicitation seeks to establish a single-award Blanket Purchase Agreement (BPA) for acid vials containing pre-filled acid solutions for the USGS National Water Quality Laboratory’s water sampling and testing programs. The BPA will have a two-year period of performance from September 21, 2026, through September 20, 2028, with a maximum ordering limit of $350,000. Individual purchases will be made via firm-fixed-price call orders issued on an as-needed basis under FAR Part 12 commercial procedures. This opportunity is not a small business set-aside; the applicable NAICS code is 325199 with a 1,250-employee size standard. Offerors must have an active SAM.gov registration when submitting an offer and at the time of award.