Water Treatment Options - Where Are We Now?

A new water treatment plant is under development for the Comox Valley water system. Once complete, Comox Valley residents will have the modern water treatment system they deserve and turbidity related boil water notices will be eliminated. In November 2015, a study was initiated to investigate water treatment options which informed the current project plan. More information about this study is available below. If you would like to read about the water treatment project in its current form, please visit our project page.

Learn More About the Water Treatment Project

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Comox Lake Water Treatment Options Study Results

The study occurred from November 2015 to fall 2016 and involved detailed topographic survey and technical review of intake and treatment options. Identification of existing geotechnical, archaeology and environmental values studies were also completed.

As part of the study, the CVRD and Opus team worked closely with community stakeholders to review options, at the conceptual level, to provide improved water intake and compliant treatment delivery.

Components Studied

The results of this project were focused on the components necessary to meet the treatment requirements set out by the Vancouver Island Health Authority. This includes:

  1. Water Supply from Comox Lake – a new intake within Comox Lake or potentially on the Puntledge River, sized for a 50-year design life and projected flow rates to service the communities that participate in the CVRD water service function.
  2. Conveyance from Intake to Water Treatment Plant (WTP) – a new pumping station will be needed near the intake location, lifting water to a pipeline that runs between the intake and the WTP.
  3. Water Treatment Plant (WTP) – a new WTP must include filtration and disinfection. This must be sized to meet at least the existing maximum day demand (summer flows) but with turn-down to average winter day demand. The facility also will include facilities for treated water storage, and space for management of water treatment residuals.
  4. Treated Water Pipeline – a new treated water pipeline will be required from the WTP to the water distribution system.

Financing Strategy & Details

The cost estimate at the time of the study was $105 million and was broken down as follows:

Project Component

Estimated Cost*

Deep water lake intake near the existing deep water sampling station sized for full system buildout to 2069


Raw water pumping station located on the lake shore sized for easy expandability for full system buildout to 2069


Conveyance of raw water from the pump station to a WTP located on or near Site A near the intersection of Bevan Road and Lake Trail Road


Direct filtration and UV disinfection of the raw lake water and discharge to a clear well on the WTP site, located at the optimal elevation to maximum gravity distribution of water throughout the CVWS


Conveyance of treated water down the BC Hydro penstock right of way to tie into the CVWS near the existing chlorination station


Total Project Costs:


* Cost estimates developed to Class B or +/- 20 per cent accuracy

Project Presentations & Reports


If you have any questions regarding this study please give us a call at 250-334-6000 or fill out our online form