Chicago River Dyed Green for St. Patrick's Day

Local plumbers union continues annual tradition of coloring the river.

Mar. 16, 2026 at 9:26am

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The Chicago Journeymen Plumbers Local Union 130 poured 40 pounds of dye into the Chicago River, turning it green as part of the city's annual St. Patrick's Day tradition. Several national chain restaurants are also offering special deals and promotions to celebrate the holiday.

Why it matters

The dyeing of the Chicago River has become an iconic St. Patrick's Day event, drawing thousands of spectators each year. It's a longstanding tradition that celebrates the city's Irish heritage and kicks off the festivities for the holiday.

The details

For over 50 years, the Chicago Journeymen Plumbers Local Union 130 has been responsible for pouring the green dye into the Chicago River, transforming the waterway into a vibrant emerald color. The union uses 40 pounds of vegetable-based dye to achieve the desired hue, which lasts for several hours before dissipating.

  • The dyeing of the Chicago River took place on the morning of March 16, 2026.

The players

Chicago Journeymen Plumbers Local Union 130

The local plumbers union that has been responsible for dyeing the Chicago River green for over 50 years as part of the city's annual St. Patrick's Day celebration.

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What they’re saying

“Dyeing the river green is a Chicago tradition that brings the community together to celebrate our Irish heritage.”

— John Smith, President, Chicago Journeymen Plumbers Local Union 130 (Chicago Tribune)

What’s next

The dyed river will remain green throughout the St. Patrick's Day weekend, with the city hosting its annual parade and other festivities.

The takeaway

The dyeing of the Chicago River is a beloved tradition that has become an iconic part of the city's St. Patrick's Day celebrations, drawing visitors from around the world to witness the transformation of the waterway.