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Project: Feasibility Study to Develop the Simi Valley Groundwater Basin as a Potable Resource

Description: The Feasibility Study will develop and evaluate alternatives to identify a preferred project that will produce and deliver 5,500 acre-feet per year (AFY) of local potable groundwater supply for City of Simi Valley, Ventura County Waterworks District No. 8 (District) customers. This local potable groundwater supply would offset District purchases of imported State Water Project (SWP) supplies from the Calleguas Municipal Water District (Calleguas). Currently, the District has an average water demand of 17,300 AFY of which 99 percent is supplied with imported SWP water purchased from Calleguas. The Feasibility Study will be based on the data and findings of the "Characterization and Groundwater Supply Assessment for Simi Valley Basin, March 2016" (Characterization Study). The Characterization Study estimated the perennial yield for the Simi Valley Basin (SVB) to be approximately 9,000 AFY and determined that the groundwater has high levels of Total Dissolved Solids, Sulfate, Hardness (as calcium carbonate), and other constituents that would require treatment to allow for its potability. Treatment processes to remove such constituents generally produce an effluent (potable water) and a smaller amount of brine waste byproduct having very high levels of the constituents removed. Up to now, brine disposal has been a prohibitive obstacle to treating SVB groundwater. However, the planned construction of the Salinity Management Pipeline to reach the City of Simi Valley in 2022 by Calleguas provides for brine disposal to the ocean allowing for possible SVB groundwater treatment. The treated brackish groundwater supply will meet drinking water standards.

Reference Number: 3860-P01-341

Implemented By: City of Simi Valley

Objective: The study will evaluate the feasibility and cost-effectiveness of developing the Simi Valley Basin (SVB) as a new local potable water supply to offset the use of imported State Water Project (SWP) supplies to serve its water customers.

Type: Water Management

Total Cost: $292,333.00

Project Status: Complete and Fully Paid

On Time?: Yes    Within Scope?: Yes    Within Budget?: Yes

Estimated Completion: 12/31/2020    Actual Completion: 8/3/2020

Associated Counties: Los Angeles

Project Benefits a Disadvantaged Community (or SDAC): No

Contribution SourcesContribution DateContribution Amount
Local Contribution3/28/2019$147,648.00
Prop. 1, Water Recycling3/28/2019$144,685.00

Project MetricMetric TopicQuantityUnit
Water ManagementDesalination  

Water Action Plan Target

Make Conservation a California Way of LifeAction Description
Increase Regional Self-Reliance and Integrated Water Management Across All Levels of GovernmentAction Description
Achieve the Co-Equal Goals for the DeltaAction Description
Manage and Prepare for Dry PeriodsAction Description


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