In a Facebook post on Thursday, the council urged parents to speak to their children about “what can and cannot be flushed down the toilet”.
A spokesperson said the rate of blockages at the Eureka St pump was costly for the community.
CODC wastewater pump stations were monitored 24 hours a day by a remote system and when the pumps failed, an alarm was sent to operators who had to attend the site to address the issue.
“Each incident requires the pumps to be lifted and cleared before they can be put back into service,” the spokesperson said.
Although the frequency of blockages from underwear was unusual – blockages in the wastewater network caused by things residents should not be flushing was common, the spokesperson said.
“Blockages caused by incorrectly flushing wet wipes, sanitary items and putting cooking fats and oils down the kitchen drain all contribute to elevated operational cost to the community.
“We might not think that the residual oil in our frying pan or the couple of wipes we flush would cause an issue, but when that accumulates from every household in a town, it results in significant issues.”