Signage warning Killara residents to avoid a creek that runs through the Riverside Estate is due to a sewerage spill.
The erection of signs and contractors seen pumping water on Monday caused concern for some residents, and The Border Mail was contacted.
The alert warned people not to drink, swim or fish in any nearby waterway.
"North East Water staff have cleaned up a sewage spill caused by wet wipes blocking a sewer pump station in Killara," John Day of executive operations said.
"The spilt wastewater entered a nearby unnamed creek near Riverside Drive on Friday, July 31.
"The Environment Protection Authority has been notified of the spill. The blockage at the pump station has been rectified, and we have cleaned and disinfected at the spill location."
"Sampling of the creek water has been conducted to determine any impacts to the creek, and we are advising people to avoid the area and abide by nearby signage."
Managing director Craig Heiner said in May that NEW continued to struggle with the issue of wet wipes being flushed.
"Over the past several months, we've seen a noticeable increase in materials being removed from inlet screens at our sewage treatment plants," he said.
"As an example, in Wangaratta, an extra skip-bin of wet wipes and other non-flushable products is being filled per week.
IN OTHER NEWS:
"We would like to remind customers to never flush anything other than the three P's - pee, poo and (toilet) paper down the loo."