A sewage pipe broken by a driller working for Opus and Powerco will take weeks to fix.
The pipe, a main interceptor, is under Karoro Rd, near the Beach Rd intersection.
A Whanganui District Council spokeswoman said a driller working for Opus and Powerco broke the pipe.
She said the pipe is seven metres deep "so it is a big job that is likely to take weeks, not days, to fix."
There are no health issues for residents, she said.