Central Marin Sanitation Agency (CMSA)

CMSA provides wastewater treatment, disposal and related environmental services to protect public health and enhance environmental quality within its central Marin service area.

CMSA operates the largest wastewater treatment facility in Marin County. We treat and dispose of the wastewater and biosolids collected from households and businesses in central Marin County. Approximately 6 billion gallons of wastewater are treated and released as clean effluent into San Francisco Bay each year, and we consistently meet and exceed all Federal and State regulatory requirements.