A wastewater overflow is when wastewater flows out from the pipes or manholes from where it is usually contained into a stream, river or the sea. This is not normal and preventing this from occurring is a high priority for the Council.

Wastewater overflow details are listed below. Information will be updated once discharge has ceased and pollution has completely cleared, which may take up to two days. 

2017 overflows

Discharge began Discharge ceased Overflow location Waterway affected Cause
12/10/2017 21:30 12/10/2017 22:30 Main Road, between Shag Point and Clifton Terrace Pegasus Bay Over-pumping failure
2/09/2017 02:00 2/09/2017 16:00 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour High Rainfall
15/8/2017 13:00 17/8/2017 12:00 The Groynes, Groynes Drive Waimakariri South Branch - Otukaikino Stream Pipe Joint fault
14/8/2017 12:30 14/8/2017 16:00 Cnr Peverel and Division Streets Avon River (Riccarton Stream) High Rainfall
14/8/2017 09:20 14/8/2017 15:31 PS1/21 Grassmere Avon River High Rainfall
14/8/2017 07:40 14/8/2017 16:00 PS0047 Truscotts Rd Heathcote River High Rainfall
14/8/2017 07:40 14/8/2017 16:00 PS0134 McFarlane Park - Emmett Street Avon River (via Shirley Stream) High Rainfall
14/8/2017 07:40 14/8/2017 16:00 PS0043 Fairview St Heathcote River High Rainfall
14/8/2017 07:40 14/8/2017 16:00 PS0034 Scarborough - Heberden Ave Pegasus Bay High Rainfall
14/8/2017 07:30 14/8/2017 16:00 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour High Rainfall
14/8/2017 07:15 14/8/2017 16:00 Lyttelton Wastewater Treatment Plant Lyttelton Harbour High Rainfall
14/8/2017 06:02 14/8/2017 16:00 Akaroa Wastewater Treatment Plant Akaroa Harbour High Rainfall
14/8/2017 06:02 14/8/2017 15:49 PS615 Akaroa Fire Station Akaroa Harbour High Rainfall
23/7/2017 25/7/2017 09:00 277 Hoon Hay Road Heathcote River High Rainfall
22/7/2017 23/7/2017 PS43 6 Fairview Street Heathcote River High Rainfall
22/7/2017 23/7/2017 PS60/1 286 Halswell Road Heathcote River High Rainfall
22/7/2017 22/7/2017 PS61/1 3 O'Halloran Drive Halswell River High Rainfall
22/7/2017 22/7/2017 PS73/1 122 Kennedy's Bush Road Halswell River High Rainfall
22/7/2017 23/7/2017 PS22/1 Eastern Terrace - Cnr Bowenvale and Centaurus Roads Heathcote River Blocked Syphon and High Rainfall
22/07/2017 09:20 23/07/2017 11:00 72 Cashmere Road Heathcote River High Rainfall
22/7/2017 23/7/2017 263 Eastern Terrace Heathcote River High Rainfall
21/7/2017 09:30 22/7/2017 Emmett Street, Shirley Avon River (Dudley Creek) High Rainfall
21/7/2017 06:00 23/7/2017 02:00 PS615 Akaroa Fire Station Akaroa Harbour High Rainfall
21/7/2017 10:00 23/7/2017 04:00 PS1/21 Grassmere Avon River High Rainfall
21/7/2017 08:00 23/7/2017 Diamond Harbour Treatment Plant Lyttelton Harbour High Rainfall
21/7/2017 10:00 23/7/2017 Akaroa Treatment Plant  Akaroa Harbour High Rainfall
21/7/2017 09:45 23/7/2017 Duvauchelle Treatment Plant Akaroa Harbour High Rainfall
21/7/2017 10:00 23/7/2017 Lyttelton Treatment Plant Lyttelton Harbour High Rainfall
21/7/2017 07:00 23/7/2017 19:00 Cnr Peverel and Division Streets Avon River (Riccarton Stream) High Rainfall
6/7/2017 09:30 6/7/2017 10:00 Cnr Cashmere Road and Purau Tce Heathcote River Blocked Sewer
13/6/2017 18:00 13/6/2017 21:00 Cnr Cracroft Terrace and Dyers Pass Road Heathcote River Blocked Sewer
2/6/2017 09:30 2/6/2017 11:30 Cnr Cashmere Road and Purau Tce Heathcote River Blocked Sewer
29/5/2017 29/5/2017 Morgans Gully, Diamond Harbour Lyttelton Harbour Blocked Sewer
15/5/2017 16:00 15/5/2017 16:45 45 Marine Drive, Diamond Harbour Lyttelton Harbour Blocked Sewer
18/4/2017 14:27  18/4/2017 18:00 27 Dyers Pass Road Heathcote River Damaged Pipe
14/4/2017 06:30 14/4/2017 18:00 Hagley Park - Deans Avenue Avon River High Rainfall
14/4/2017 08:50 14/4/2017 14:00 PS615 Akaroa Fire Station Akaroa Harbour High Rainfall
14/4/2017 08:50 14/4/2017 10:50 Duvauchelle Treatment Plant Akaroa Harbour High Rainfall
14/4/2017 08:00 14/4/2017 16:00 Diamond Harbour Treatment Plant Lyttelton Harbour High Rainfall
14/4/2017 07:30 14/4/2017 16:00 Lyttelton Treatment Plant Lyttelton Harbour High Rainfall
6/4/2017 13:30 6/4/2017 23:30 PS1/11 - 317 River Road Avon River High Rainfall
6/4/2017 14:00 7/4/2017 0:00 PS22/1 Eastern Terrace Heathcote River High Rainfall
6/4/2017 12:00 7/4/2017 0:00 PS20/3 Tennyson Street Heathcote River High Rainfall
6/4/2017 12:00 7/4/2017 0:00 PS20/5 Fisher Avenue Heathcote River High Rainfall
6/4/2017 12:00 6/4/2017 21:00 Lyttelton Treatment Plant Lyttelton Harbour High Rainfall
6/4/2017 13:30  7/4/2017 0:00 Diamond Harbour Treatment Plant Lyttelton Harbour High Rainfall
6/4/2017 02:30 6/4/2017 06:00 Akaroa Fire Station, Akaroa Akaroa Harbour High Rainfall
23/2/2017 09:30 23/2/2017 10:30 Akaroa Fire Station, Akaroa Akaroa Harbour Blocked Sewer
5/2/2017 19:00 5/2/2017 23:00 22 Marine Drive, Diamond Harbour Lyttelton Harbour Blocked Sewer

Ongoing issues under investigation

Overflow location Waterway affected Possible cause
Lyttelton Wastewater Treatment Plant Outfall Lyttelton Harbour

Intermittent overloading of the reticulation during rainfall. Possible cause is cross-connection between stormwater and wastewater. A project is ongoing to reduce inflow and infiltration in the Lyttelton reticulation.

NB: All overflow incidents will be recorded on the current overflow webpage.