Computer graphic of 2020 infrastructure

Columbine Station Improvement Project


Beginning in January 2020, San Jose Water is launching a multi-year project to improve the storage facilities at our Columbine Station.

This capital improvement project will demolish the existing earthen-embankment reservoir built in 1963 — replacing it with two 5 million gallon pre-stressed concrete water storage tanks. The original facility has reached the end of its useful life.

Columbine Station serves as the primary water storage facility for approximately 31,500 customers in the San Jose area.

Components of this project include:

  • Earthwork and construction of concrete tank foundations and pre-stressed tanks
  • Replacement of the inlet/outlet pipe within the boundary of the site grading and drainage
  • Improvements to the storm drain infrastructure, including stormwater control and treatment basins
  • Installation of tank mixing systems and tank overflow structure
  • Site paving
  • Tree replacement/landscaping improvements
  • Upgrades to public infrastructure fronting the project site

Once complete, the Columbine Tanks will provide 10 million gallons of water storage to the surrounding communities. We don’t expect construction to adversely affect traffic or residents in the area.

Work will be done Monday through Friday between the hours of 7:00 AM and 7:00 PM, per approved City of San Jose permitting for the project. 

If you have any questions or concerns, please contact us at or (408) 279-7900.


Why are we doing this?


  • To create more resilient water storage capacity by constructing water storage structures with a long service life and seismic stability

  • Improved water quality due to reduced storage capacity and installation of mixing systems in each tank

  • Two storage tanks instead of one reservoir means more operational flexibility for serving our customers




SJW Columbine Timeline: January 6th, 2020:  First day of construction and mobilization to the site.  May 31st, 2020:  Complete construction of Tank 1 floor.  May 15th, 2021: Tank 1 fully operational.  August 30th, 2021:  Complete construction of Tank 2 floor.  August 31st, 2022: Tank 2 fully operational.  November 30th, 2022: Substantial completion of project.  April 15th, 2023: Final completion of project.

*Note: this timeline is based on a construction plan that is subject to change. Updates will be made to the timeline if necessary and when available.


Historical Construction Photos


The Columbine Drive Station reservoir was originally constructed in 1963.


Columbine Historical Image 1 - black and white photo of workers laying cement

Cement Foundation

Construction workers forming and pouring the concrete foundation and bottom liner of the earthen embankment reservoir.

Columbine Historical Image 3 - black and white photo of a workers cutting material

Construction Activity

Cutting material at the construction site

Columbine Historical Image 5 - black and white photo of workers constructing

View of the Columbine Site

Construction of columns, beams, and foundations from the bottom of the 19.6 million gallon reservoir.