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Groundwater

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What is the City doing?

In 2016, a study completed by the City, concluded that treated groundwater is a viable alternative to imported water for irrigation and potable water use. The study recommended the rehabilitation of the existing Los Robles Golf Course (LRGC) groundwater well and construction of a groundwater treatment facility as the initial step in citywide groundwater utilization program.

Subsequently, in 2018, a study was conducted to evaluate the potential of developing LRGC groundwater well as a source of irrigation and potable water. The study showed that roughly 10 percent of city’s current water usage could be offset with treatment of the LRGC groundwater to potable level. The study looked at three critical issues: sustainable flow from the LRGC well, treatability, and brine disposal process. It was concluded that desalination of the LRGC well water is feasible for irrigation and potable use. The study recommended a pilot testing to better optimize the process prior to full-scale treatment implementation.

Where is this City doing this work?

The pilot testing followed by full-scale treatment at the existing LRGC groundwater well, at 299 S Moorpark Rd, Thousand Oaks, will serve as the initial phase of groundwater utilization for irrigation and potable use.

Why is the City doing this?

The cost of imported water continues to increase. At the same time, reliability of this source is not as certain due to drought and environmental challenges. A local groundwater source would be more reliable and cost effective than imported water.

A pilot test will allow the City to obtain performance data for two different options in treatment systems, assess and optimize performance to refine system design, and reduce treatment system life cycle costs.

What are the impacts from this project?

Because there are three main water suppliers within Thousand Oaks (California American Water Co in Newbury Park, City Water System in central Thousand Oaks, and California Water Service Co in Westlake), arrangements still need to be made as to who will finance, construct, own, operate and maintain new groundwater wells and related facilities. The study concluded that better quality groundwater exists in the western areas of the city, which would result in lower costs due to lower treatment requirements.

When is the City doing this work and how long will it take?

The pilot test started in March 2019 at LRGC groundwater well and will continue for 6 months.

The completion of the pilot program will be followed by a full-scale treatment facility design and construction. Completion of the construction is anticipated by the end of the year 2021.  In the meantime, the City is making progress in obtaining grant money to fund portions of the project design and construction costs.

What if I still have questions?

For more information, please contact Ayda Forouzan, the City’s project manager at aforouzan@toaks.org .

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