The diesel leak on Mt Ruapehu last year cost the Ruapehu District Council $629,000 over the time of the spill.
That does not include staff time.
The costs covered all civil defence responses, public meetings, emergency water supplies/services, temporary showers and toilets, and the costs of cleaning/flushing/rebuilding the water treatment system and reticulated network.
Horizons Regional Council (HRC) cleaned up the diesel from the Makotuku Stream.
The leak from the 40,000-litre capacity tank at Turoa ski field, owned by Ruapehu Alpine Lifts (RAL), was discovered on September 27.