Opened in 1948 and upgraded several times in its 60+ year history, Central San’s Treatment Plant cleans an average of 34 million gallons of wastewater per day.
Located in Martinez, the plant has a treatment capacity of 54 million gallons per day (mgd) and 240 mgd of wet weather flow. The Plant Operations Building houses the Control Center, a state-of-the-art computerized system that monitors and controls every phase of the treatment process. The facility is staffed 24 hours a day, 365 days a year.
Central San provides landscape irrigation water that meets all the requirements of the State Water Resources Control Board’s Division of Drinking Water and the San Francisco Regional Water Quality Control Board for unrestricted landscape irrigation. Approved uses include irrigation at schools, parks, playgrounds, median strips and playing fields, as well as dust control and industrial process uses.
Central San is required to meet dozens of stringent water quality regulations. We operate a laboratory that constantly monitors the wastewater as it undergoes treatment and after it is thoroughly cleaned and disinfected. The lab uses high tech equipment capable of detecting some pollutants to the parts per quadrillion.
Open for Service by Appointment Only
Our Household Hazardous Waste (HHW) Collection Facility has reopened with modified operations to protect the health and safety of our customers and employees. At this time, HHW drop-off is available by appointment only. Please schedule your appointment using our online system.
Based in Walnut Creek, a crew from Collection Systems Operations (CSO) can reach the site of a sewer overflow anywhere in the Central San service area in 30 minutes or less.
Along with emergency response, CSO is responsible for the cleaning, maintenance, and repair of the over 1,540 miles of underground pipeline that makes up the Central San’s sewer system. These pipes range in size from 6 inches to 102 inches in diameter. Maintaining this system is an ongoing process involving approximately 60 employees.
Central San operates 18 pumping stations throughout our service area 24 hours a day, 365 days a year.
Much of the wastewater flows to the Martinez treatment plant through pipes by force of gravity. But there are some areas where hills prevent natural flow and pumping facilities are required to “lift” the water over these inclines.
Central San’s Headquarters Office Building (HOB), located at 5019 Imhoff Place in Martinez, was built in the early 1980s and houses its professional staff.
The HOB is a four-story building that includes the Permit Counter, the Administrative and Engineering Departments, as well as the District Board Room.