USACE Sacramento District is conducting market research via a Sources Sought Notice for a potential Design-Bid-Build construction requirement to improve the Copper Cove Wastewater Treatment Plant in collaboration with Calaveras County Water District in Calaveras County, California. The anticipated work includes replacing filter systems and electrical upgrades, interconnecting with a SAF pretreatment system, installing a continuous backwash filter in a partially buried concrete tank, a masonry compressor building, a wet well/submersible pump station, demolition, and sludge dewatering/yard piping modifications. A firm-fixed-price solicitation may be issued around December 2026, with award anticipated around March 2027 and construction estimated to be completed within 365 calendar days after Notice to Proceed, with potential seasonal impacts from bird nesting from 1 February through 31 August. The Government currently estimates the target price range at $5,000,000 to $10,000,000, and the NAICS code is 237110 with a $45,500,000 small business size standard. Interested contractors, including small businesses and other than small businesses, are invited to submit capability statements for market research; no solicitation is currently available and no award will result from this notice.