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Today in Canada > Tech > Why water in Windsor’s Grand Marais drain looks neon green
Tech

Why water in Windsor’s Grand Marais drain looks neon green

Press Room
Last updated: 2025/11/19 at 11:11 AM
Press Room Published November 19, 2025
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No, it isn’t a super early St. Patrick’s Day gag — part of the Grand Marais drain has been bright green the past few days.

The neon colouring is because of a dye put into the system to test water system infrastructure, according to Enwin.

It’s part of the Windsor Utilities Commission’s Feedermain project. During a test of the system, a segment of the new infrastructure did not pass inspection, so dye was added to help identify the source of the issue.

Ducks swimming in bright green water in a creek in the southwestern Ontario border city.
Ducks swimming in bright green water in a creek in the southwestern Ontario border city. (Mike Evans/CBC)

The dye is food-grade and non-toxic, Enwin says, and is specially formulated and certified for use in drinking water.

“Once testing is complete, the affected watermain will be flushed and retested to confirm full integrity before it becomes operational,” an Enwin spokesperson said in a statement.

The watershed is in the area of Grand Marais Road East near Langlois Avenue.

Ducks could be spotted in the water on Monday.

The water in a creek near Grand Marais Road East near Langlois Avenue in Windsor is bright green on Nov. 17, 2025.
The water in a creek near Grand Marais Road East near Langlois Avenue in Windsor is bright green on Nov. 17, 2025. (Mike Evans/CBC)

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