Ratepayers face a legacy of debt as council borrowing soars to replace creaking assets and cater for growth, while keeping rates down.
Local authority debt is expected to reach $19 billion by 2022 with the fast-growing Auckland Council leading the charge.
The super city's borrowing will treble in the current 2012-22 planning period, reaching $13.1 billion in 2022.
At the same time, councils are charged with keeping rates rises low under stringent accounting rules imposed by the Government after an era of high annual rates increases.
High-debt northern councils which risk falling foul of borrowing limits - inviting Government intervention if balance sheet projections change - include Auckland, Hamilton, Tauranga, Western Bay of Plenty and Kawerau.