Green water was seen at Willows Beach on Jan. 7. (Photo by Rocky Holmes)

Green water flowing into ocean at Willows Beach no cause for concern

Oak Bay was conducting sewage tests using an EPA certified tracing dye

Green water spotted running into Willows Beach this week was an environmentally safe tracing dye, said David Brozuk, Oak Bay superintendent of public works.

“It’s basically to see if there’s a cross connection from a sewer service into a storm service,” Brozuk said. “We don’t want any sewage to get into our outfalls, then into the ocean.”

READ ALSO: Heavy rains cause wastewater overflows in Oak Bay, Saanich

Generally, there are two types of lines. One handles household sewage, while the other handles wastewater such as rainwater or gardening runoff. The naturally occurring runoff can go directly through sewer outfalls into the ocean, but crews need to monitor to make sure there’s no cross-contamination with any potentially toxic sewage. The municipality frequently tests lines and trenches when a house is undergoing renovations or having its sewer system upgraded.

READ ALSO: Oak Bay awards Humber design for Uplands sewer separation

“Older houses have storm and sewer lines in the same trench. After 60 to 70 years the sewer and storm line seals start to disintegrate or wear away, which can cause the sewage to enter the storm line that would put in into the ocean,” Brozuk explained.

According to Brozuk, the municipality conducts between 150 and 200 such tests every year. Usually, the discoloured water washes away in a few hours, though dry weather can sometimes cause it to linger. The tests are mandated by the Capital Regional District and paid for by Oak Bay. Brozuk estimated that each test costs approximately $200, meaning the municipality spends around $35,000 conducting tracing tests yearly.



jesse.laufer@oakbaynews.com

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