The back road into Mt Hagen city from Warakum industrial area has been cut off.
A culvert was washed away by flood from a small creek in 2015.
Pictured: Nicky Moimkua, who lives near Hagen cemetery, pointing at exposed sewerage pipe coming from Tee school into the main treatment plant about a kilometre away.
If the pipe breaks, it will spill sewage into the stream.
The authorites should fix it.