Kapiti Coast District Council is monitoring a sewer outlet at Paraparaumu Beach after a wall protecting it moved.
A 170 metre temporary block wall was installed at the sewer main serving properties on Wharemauku Road following a big storm in August.
A portion of the blocks along the central section of the wall have recently rotated towards the sea, the council says.
The situation is being monitored during the weekend.
The council's staff, contractors and engineering consultations have assessed the wall and say there is no immediate danger of it collapsing, says Sean Mallon, the council's group manager of infrastructure services.
"We are currently planning on doing a further assessment on Monday to determine the extent of any repairs or remedial works required," he says.
"In the meantime, we're installing barriers and signage alerting the public to the potential instability of the concrete blocks and restricting access along the reserve area behind the wall.''