The annual tradition has been carried out by Journeymen Plumbers Local Union 130 since 1962.
The idea came when a plumber used an orange dye to detect pollution in the river and noticed it turned his overalls green. They then used it to dye the river — and the tradition was born, according to Secret Chicago.
The dyeing got underway at 10 a.m. and thousands lined the streets to catch a glimpse of the iconic event.
40 pounds of the dye, which is eco-friendly, is spread by various boats as they make their way down the river, but the rich green color only lasts for a little while.
The specific recipe for the dye is a closely guarded secret.
Shortly after the dyeing, at 12:30 p.m., the Chicago’s St. Patrick’s Day Parade steps off at Columbus Drive and Balbo. The celebration is one of the largest St. Patrick’s Day parades in the country.
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