The taps of Onoway, Canada, ran pink on Monday (March 6), lending a new meaning to the term "local colour".
Regular, colourless water was not restored until Tuesday morning, much to the annoyance of Onoway's residents, who flooded the town office with complaints.
According to a report from the BBC, the fluorescent pink colour was a side-effect of potassium permanganate, a chemical commonly used in water treatment processes to remove iron and hydrogen sulphide.
The town office said the chemical got into the reservoir when a valve malfunctioned during "normal line flushing and filter backwashing".
Potassium permanganante can cause skin irritation, but there were no reports of any adverse effects from Onoway's residents, who were more upset about being kept in the dark.
In a statement, Mayor Dale Krasnow said there was no public health risk but the town "could have done a better job communicating what was going on".