Monterey One Water is here to protect public health and the environment. Every time water is used indoors within our Service Area, from washing dishes to flushing the toilet, it’s pumped through an underground series of pipes to the Monterey One Water Regional Treatment Plant located north of the city of Marina. At the Regional Treatment Plant, the used water, also known as wastewater, is cleaned and safely reintroduced into the environment.
Monterey One Water’s Regional Treatment Plant (RTP) is located two miles north of the city of Marina. The facility began operation in February of 1990 and was constructed to bring regional efficiency to the treatment of wastewater, to improve water quality, and to provide cooperative water solutions for the community.
Monterey One Water owns and operates a regional sanitary sewer system that serves a population of approximately 250,000 in 10 Member Entity jurisdictions. These jurisdictions include; the Cities of Del Rey Oaks, Monterey, Pacific Grove, Salinas, Sand City, and Seaside; the Castroville Community Services District; Marina Coast Water District; Boronda County Sanitation District; and Monterey County.
Monterey One Water’s Regional Treatment Plant (RTP) utilizes a multi-step process in which wastewater entering the RTP from homes and businesses is taken through a series of processes to remove solids, pollutants, and harmful bacteria. The Facility treats an average of 18 million gallons of wastewater per day (mgd), with capacity of up to 29.6 mgd. The Facility serves 250,000 community members and 10 member entities.