New Zealand's local authorities face a $100 billion-plus to replace ageing water pipes, drains and sewers and will need central government assistance to meet the bill, says Local Government New Zealand, the lobby group for the sector.

At its quarterly briefing on Tuesday, LGNZ president Lawrence Yule – also a National Party candidate in the September general election – said a swathe of essential underground infrastructure installed by towns and cities in the 1960s was reaching the end of its life and would need replacement in the…