Lists of recent and historic wastewater overflows.

2026 overflows

This page is updated as soon as possible; however, it is a manual process, so there may be delays during busy periods.

If you see signs about polluted water around the city and have further questions, please contact us. Pollution may take up to two days to completely clear after the discharge has ceased.

Event identification (ID) numbers are not consecutive, due to false alarms, etc. 

Overflow reported Overflow ceased ID  Overflow location Receiving waterway Cause
10/01/2026 3pm 10/01/2026 5pm 597 Corsair Bay Beach, Lyttelton Lyttelton Harbour Blockage (rubbish)
15/01/2026 6:40pm 15/01/2026 9pm 598 Corner of Ferry Road and Richardson Terrace, Woolston Heathcote River Wet weather
17/01/2026 10:40am 17/01/2026 12:20pm 599 Te Ara Crescent, Diamond Harbour Lyttelton Harbour Blockage
07/02/2026 10:30am 07/02/2026 2:30pm 601 Te Ara Crescent, Diamond Harbour Lyttelton Harbour Burst drinking water main