Residents living along the Gran Valira River in the Pyrenees mountains were seriously alarmed after discovering their river had turned emerald green overnight.
And before officials explained residents that a harmless dye had intentionally been added to the river giving it the fluorescent color.
St. Patrick’s Day is only in 10 days!
The harmless dye had intentionally been added to the river to investigate a water bottling plant.
The substance is non-toxic to people and harmless to the natural environment and is bio-degradable.
The water bottling plant was reportedly linked to a gastroenteritis outbreak in Catalonia last year that left thousands of people sick after they drank from contaminated office water coolers.
Images of the river have caused consternation on social media.
Chicago might be the only place where a river suddenly turns bright green without alarming residents. The city annually dyies the Chicago River green the Saturday before St. Patrick’s Day.