This sources sought notice is for market research only to assess small-business availability for a potential set-aside; no award will be made and no solicitation is currently available. The work is a service contract for USACE San Francisco District to provide sewage pumping and disposal, drain clearing, portable toilet rental, and portable/vault toilet cleaning and treatment at Coyote Valley Dam and Lake Mendocino in Ukiah, California. Services will be performed on a call-out basis, with tank/vault capacities ranging from 1,000 to 10,000 gallons and up to four sets of regular and ADA portable toilets potentially required at one time. The anticipated period of performance is one base year plus three option years, and solicitation issuance is anticipated on or around December 2026. The notice seeks capability information from Small Business, Certified 8(a), Certified HUBZone, and SDVOSB firms, including recent relevant sewage/septic experience.