San Pablo Clearwell Replacement & Water Treatment Plant Rehabilitation Project

EBMUD is planning to replace the 5.4 million-gallon San Pablo Clearwell (water storage tank) and rehabilitate portions of the San Pablo Water Treatment Plant both of which are located within EBMUD's San Pablo Water Treatment Plant site in Kensington.

The San Pablo Clearwell, an important reservoir for the area, has reached the end of its useful life. It will be demolished and replaced with two 3.5 million-gallon concrete tanks, then backfilled with soil within the existing reservoir basin. The San Pablo Water Treatment Plant is a standby facility that was rehabilitated and brought online to allow rehabilitation of the Orinda Water Treatment Plant. The project is part of a larger plan to construct and update existing facilities to improve water service by enhancing and modernizing water treatment and moving water efficiently to where it is needed most.

Improvements will be made to the San Pablo Tunnel that conveys water from the San Pablo Reservoir to the San Pablo Water Treatment Plant. A concrete plug with a steel pipe and valve will be installed inside the tunnel southwest of the San Pablo Reservoir Outlet Tower on EBMUD property in El Sobrante. This retrofit will isolate the tunnel from the reservoir as a fail-safe in the event of an earthquake and provide operational flexibility.

In addition, crews will install 1,250 feet of onsite and offsite transmission pipelines to connect the new facilities to the existing distribution system and replace aging pipelines. Pipeline installation will take place in the street on Coventry Road from Valley Road to the end of Coventry Road.

Workplan and schedule

The project will take place in three stages. Project construction activities began in early 2015 and will last through spring 2022.

  1. San Pablo Water Treatment Plant Rehabilitation: This phase of the project was completed in 2015.
  2. San Pablo Tunnel Improvements: spring 2018 - late fall 2018. Includes draining the Tunnel, installing the concrete plug and valve.
  3. Demolition and replacement of the San Pablo Clearwell: Early 2019 - spring 2022. Includes demolition of the existing San Pablo Clearwell and construction of two replacement concrete tanks, replacement of the San Pablo Rate Control Station, as well as the installation of transmission pipelines on Coventry Road and on the Water Treatment Plant property. A new electrical generator will also be installed on-site in fall 2018.

During construction, the community can expect to see tree trimming and clearing, large equipment and materials accessing the site, minor odor during tunnel drainage work, some dust and noise as well as some temporary loss of street parking and lane closures. Typical project work hours are 7 a.m. to 7 p.m. Monday through Friday with occasional Saturday work from 8 a.m. to 4 p.m.  If extended hours are required, the community will be notified in advance of the work.

Contact information

Community Affairs
Phone: 510-287-7208

Emergencies or after-hours, call EBMUD 866-403-2683

Published studies and other resources

EBMUD has completed the Notice of Exemption for the project as part of the environmental process. This document is available below.