A wastewater overflow is when wastewater flows out from the pipes or manholes that it is usually contained within and 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 as discharge is confirmed ceased and pollution may take up to 2 days to clear completely. 

2017 overflows

Discharge began Discharge ceased Overflow location Waterway affected Cause
21/7/2017 09:30   Emmett Street, Shirley Avon River (Dudley Creek) High Rainfall
21/7/2017 06:00   PS615 Akaroa Fire Station Akaroa Harbour High Rainfall
21/7/2017 10:00   PS1/21 Grassmere Avon River High Rainfall
21/7/2017 08:00   Diamond Harbour Treatment Plant Lyttelton Harbour High Rainfall
21/7/2017 10:00   Akaroa Treatment Plant  Akaroa Harbour High Rainfall
21/7/2017 09:45   Duvauchelle Treatment Plant Akaroa Harbour High Rainfall
21/7/2017 10:00   Lyttelton Treatment Plant Lyttelton Harbour High Rainfall
21/7/2017 07:00   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.

Past overflows

2016

2015

2014

2013

2012