Green Slick in Norwalk Harbor Explained A bright green slick at the edge of the Norwalk Harbor near Selleck Street on Wednesday afternoon sparked fear that a large amount of anti-freeze had spilled into the water.

In fact, the slick resulted from the city’s Water Pollution Control Authority releasing test dye into storm drains to establish whether the system was leaking into the city’s sanitary sewer system.

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The Hour

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