Upcoming Meetings and News
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CORRECTION: The version of this email that was released on June 6 contained errors in meeting dates and start times. We apologize for any inconvenience. The correct information is provided below.

Upcoming Meetings on the Underground In-System Wastewater Storage Evaluations and Site Selection

In January 2017, San Mateo City Council identified the City’s Corporation Yard and the San Mateo County Event Center as the final two site alternatives for the underground wastewater storage facility to progress to the next steps of design and to be further evaluated for potential impacts. Results of the evaluations for the Clean Water Program’s underground in-system storage facility location will be presented to the Public Works Commission and the City Council on June 14 and July 17, respectively. Additional information and a staff recommendation will be provided at both meetings.
During heavy rains, San Mateo’s sewer system capacity can be overwhelmed by the amount of rainwater that enters the system. This can cause sewer overflows at the wastewater treatment plant and at locations around the city, such as manholes. These overflows contain a mixture of rainwater and untreated sewage. They are a danger to human health and the environment because they contaminate City streets, creeks, lagoons, beaches, and the San Francisco Bay.

The Clean Water Program is a comprehensive plan to solve the problem. The underground storage facility is just one element. Only when the sewer system becomes overwhelmed during heavy rains, it will serve as a temporary holding facility for diluted wastewater. This temporary storage will generally be for 24 hours or less, until the storm passes. It will relieve the collection system of capacity constraints and allow the wastewater treatment plant to “catch up” with the high flows.

Public Works Commission 
June 14, 2017
7:00 p.m.
City Hall, Council Chambers
City Council 
July 17, 2017
7:00 p.m.
City Hall, Council Chambers

Public comments will be taken during both meetings.

For meeting agendas, please click here.
Once the stored wastewater is released to the treatment plant, the facility will activate self-cleaning mechanisms to flush and clean the facility, all while odor control is in effect.
The potential locations for this approximately 5-million-gallon facility have been narrowed down to two sites: the San Mateo County Expo Center and the City’s Corporation Yard.
For more information and answers to frequently asked questions, please visit
About the San Mateo Clean Water Program
The Clean Water Program is a 10-year comprehensive plan to upgrade the aging wastewater collection and treatment system with advanced infrastructure that will provide reliable services and protect public health and the environment for years to come. 
For more information, visit
Copyright © 2017 City of San Mateo - Clean Water Program, All rights reserved.

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