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March 14th, 2023

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Metro Vancouver Tap Water Upgrades

Capilano Distribution System: Twin Tunnels in Operation
After more than a decade of problematic construction the Twin Tunnels which join the Capilano reservoir with the Seymour-Capilano Filtration Plant were put into operation in early April, 2015.

The two parallel tunnels are each 7.1 km long, bored beneath Grouse Mountain and Mount Fromme. Water is pumped from the Capilano Reservoir (lower elevation) through the ‘raw water’ tunnel for combined treatment with water from the Seymour Reservoir at the Seymour-Capilano Filtration Plant (higher elevation) where raw water gets filtered, radiated with UV (Ultra-Violet) light, then chlorinated.

Treated water is then shunted back down to through the ‘treated water’ tunnel to the Capilano distribution system.

The Seymour-Capilano Filtration Plant is at a higher elevation than the Capilano Reservoir. Consequently excess pressure created by the treated water returning to Capilano generates energy that is being captured by an energy recovery system. This harvested energy will partially offset the cost of power needed to pump the raw water from Capilano to the Seymour-Capilano Filtration Plant.

The total cost of the Seymour-Capilano Filtration project was just over $800 million.

‘Capilano’ supplies tap water to most of the District of West Vancouver, western North Vancouver, Vancouver and Richmond. Residents and businesses in these areas should notice a significant year-round improvement in the clarity of tap water as a result of these upgrades.

Seymour Distribution System

Water quality coming from the Seymour watershed has been upgraded since the launch of the Seymour-Capilano Filtration Plant in 2010. The plant treats water by filtration, UV (Ultra-Violet) light, and chlorination before introducing it into the distribution system.

‘Seymour’ supplies North Vancouver, the District of North Vancouver, eastern Vancouver, Burnaby, Delta, Surrey, Port Moody and New Westminster.

Coquitlam Distribution System: UV, Ozone & Chlorine

Since 2014 a UV Disinfection Facility (ultraviolet) has been treating water going into the Coquitlam distribution system. In addition, Coquitlam water is disinfected with ozone (since 2000). UV and ozone only disinfect at the time of application. Therefore chlorine is added to Coquitlam water before it goes into the distribution system to act as a residual disinfectant as water travels to your tap.

‘Coquitlam’ supplies Coquitlam, Langley, eastern Surrey, Port Moody, New Westminster, Maple Ridge, Pitt Meadows, Belcarra and Anmore.




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