Sephora did not have permission sweep confetti into drains, Auckland Council says, following an investigation into the French cosmetics giant's store launch.
But there is not enough evidence for a prosecution.
The French company came under fire during its Queen St opening when staff were filmed sweeping confetti into stormwater drains.
At the time Mayor Phil Goff called it "unacceptable waste" dumping, and said it was "totally untrue" the council would have granted permission for such an activity.
Sephora hit back at the claims, with a spokeswoman saying they'd worked with Auckland Council "for its approved event permit to ensure the confetti was safe for the environment".