Quarterly Chronic Aquatic Toxicity Testing

The City of Stockton is soliciting a subcontract for quarterly chronic aquatic toxicity testing of wastewater effluent, requiring the use of standardized biological indicators such as Ceriodaphnia dubia and fathead minnow in accordance with EPA protocols. The testing must determine the percent effect of effluent on these species and report outcomes as either PASS or FAIL, ensuring consistent environmental compliance monitoring. All work must adhere to established regulatory methods and deliver reliable, repeatable data to support water quality assessment obligations. This contract is posted under NAICS code 541380 and has a response deadline of September 3, 2026, with no set-aside provisions specified. The performance location is tied to the City of Stockton’s wastewater operations in California, though exact details such as address or point of contact are not provided in the posting. Interested parties must submit proposals prior to the deadline to be considered for this ongoing testing engagement, which is critical for maintaining regulatory alignment and protecting local aquatic ecosystems through systematic, scheduled toxicological evaluations.