Water tracing dyes are often bright green to increase the visibility of the flow of water. They can help with determining how long it takes water to flow from point A to point B, to detect water ...

The non-toxic tracing dye will allow the BPU to locate any areas where a high ... “People should let us know if they see green water pooling on the ground or in the basement of a building and we will ...

The River O’ Green Festival will transform ... and biodegradable. The dye meets all EPA standards and is the same type used for tracing water systems and in food and medical procedures.

This iconic event, which began in 1962, was initiated by the Plumbers Local Union to use green dye for tracing sewage in the water and detecting leaks in the city's pipes.

In 1962, Chicago city workers dumped 100 pounds of dye into the river flowing through downtown Chicago. It left the river emerald green for an entire week and kick-started an annual tradition.

According to the story, the dye used to detect leaks in the sewer system along the Chicago River turned the water green, and the idea was born to dye the river green in honor of St. Patrick’s Day.