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
16/02/2026 1.00pm 18/02/2026 1.15am 603 Akaroa Fire Station, Akaroa  Akaroa Harbour Wet weather
16/02/2026 8.00pm 19/02/2026 1.00pm 605
606
609
611
613
618
619		 Heathcote River, Cashmere to Woolston Heathcote River Wet weather
17/02/2026 1.30am 19/02/2026 1.00pm 607 Diamond Harbour Bowling Green, Diamond Harbour Lyttelton Harbour Wet weather
17/02/2026 3.30am 18/02/2026 11.00am 608 Marine Drive, Charteris Bay Lyttelton Harbour Wet weather
16/02/2026 10.40pm 17/02/2026 4.00pm 610 Corner of Kilmore St and Fitzgerald Ave, Central City Avon River Wet weather
17/02/2026 12.50am 17/02/2026 2.00pm 612 Corner of Avonside Dr and Retreat Rd, Avonside Avon River Wet weather
17/02/2026 6.40am 17/02/2026 11.20am 614 Jetty Road, Governors Bay Lyttelton Harbour Wet weather
17/02/2026 7.00am 17/02/2026 11.30am 615 Erskine Point, Lyttelton Lyttelton Harbour Wet weather
17/02/2026 7.40am 18/02/2026 11.00am 616 Sandy Beach, Governors Bay Lyttelton Harbour Wet weather
17/02/2026 4.00pm 18/02/2026 4.50pm 617 Tikao Bay Beach, Tikao Bay Akaroa Harbour Wet weather
20/02/2026 4.30pm 22/02/2026 11.00pm 620 Main Road, Governors Bay Lyttelton Harbour Wet weather