Public notice of significant non-compliance for industrial users in 2025.

PUBLIC NOTICE CENTRAL CONTRA COSTA SANITARY DISTRICT NOTICE OF SIGNIFICANT NON-COMPLIANCE FOR 2025 Notice is hereby given that pursuant to the federal regulations contained in 40 CFR 403.8.f(2)(vii), Central Contra Costa Sanitary District (Central San) is required to publish the names of all Industrial Users (IUs) of Central San's public sewer system that were determined to be in Significant Non-Compliance (SNC) with applicable pretreatment standards or other pretreatment requirements during the 2025 calendar year. Federal regulations establish objective criteria for Central San to use to determine if an IU is in SNC. Discharge Quality Violations The following IUs were found to have discharged process wastewater in violation of Central San's Local Discharge Limits in a manner that met the definition of SNC. Industrial User Nature of Violation Follow-up Action Taken Bay Area Rapid Transit Limit violations for copper Central San issued Notices of Violation 1045 San Miguel Road (3) and zinc (2) from the (NOVs) for the violations. The IU Concord, CA 94518 Main Treatment System in investigated potential sources of copper concentrations that met the and zinc and did not locate any significant SNC criteria [Technical sources. Resampling demonstrated that the Review Criteria]. IU returned to compliance from the Main Treatment System. Diablo Valley College Limit violations for copper Central San issued Notices of Violation 321 Golf Club Road (3) in the discharge from (NOVs) for the violations. The IU Pleasant Hill, CA 94523 the Life Science Building in investigated potential sources of copper concentrations that met the within the Life Science laboratory operations SNC criteria [Technical and did not locate any significant sources. Review Criteria, Chronic]. The IU cleaned the pretreatment tank serving the Life Science Building to remove potential legacy sources of copper. The facility also plans to phase out the use of copper-based solutions. Resampling demonstrated that the IU returned to compliance in the Life Science Building. Reporting Violations The following IUs failed to provide the required reports within 45 days after the due date, which meets the definition of SNC. None this year CCT/SRVT 6951528; Feb. 26, 2026