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
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

Discharge began Discharge ceased Overflow location Waterway affected Cause
25/10/2016 16:00 25/10/2016 18:00 Lake Kate Sheppard adjacent to Anzac Drive Avon River Burst Water main
27/8/2016 09:30  27/8/2016 10:15 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour High Rainfall
26/8/2016 15:15 26/8/2016 15:45 Lyttelton Wastewater Treatment Plant Outfall Lyttelton Harbour High Rainfall
19/7/2016 13:00 19/7/2016 13:20 81 Cashmere Road Heathcote River Blocked Sewer
18/7/2016 11:30 18/7/2016 12:40 475 New Brighton Road Avon River Blocked Sewer
6/7/2016 11:10 6/7/2016 12:30 2 Bengal Drive Heathcote River Blocked Sewer
30/6/2016 08:00 30/6/2016 12:30 Ferrymead Bridge Heathcote River/Estuary Blocked Sewer
2/6/2016 10:00 2/6/2016 13:15 Cnr McCormacks Bay Road and Soleares Ave Avon Heathcote Estuary Blocked Sewer Main
30/5/2016 22:29 31/5/2016 00:15 Lyttelton Wastewater Treatment Plant Outfall Lyttelton Harbour High Rainfall
28/5/2016 06:55 28/5/2016 09:15 Lyttelton Wastewater Treatment Plant Outfall Lyttelton Harbour High Rainfall
23/5/2016 03:40  23/5/2016 07:40 Lyttelton Wastewater Treatment Plant Outfall Lyttelton Harbour High Rainfall
21/5/2016 19:30  21/5/2016 20:45 Duvauchelle Wastewater Treatment Plant Outfall Akaroa Harbour Power Cut
21/5/2016 16:00 21/5/2016 17:24 Lyttelton Wastewater Treatment Plant Outfall Lyttelton Harbour High Rainfall
13/4/2016 16:03 13/4/2016 18:28 3 O'Halloran Drive, Halswell Halswell River Broken pressure main
7/4/2016 07:30 7/4/2016 08:40 Gould Cresent, Woolston Heathcote River  Contractor works failure
3/4/2016 12:30 3/4/2016 13:00 Bayview Cresent, Duvauchelle Akaroa Harbour Damaged Pipe
16/3/2016 06:40 16/3/2016 10:00 303 Cambridge Terrace Avon River Excessive rainfall intrusion
25/2/2016 14:30 25/2/2016 15:00 Cnr Sloane and Centaurus Road Heathcote River Blocked Sewer
18/2/2016 02:00 18/2/2016 04:00 Lyttelton Wastewater Treatment Plant Lyttelton Harbour High Rainfall
14/02/2016 12:30 14/02/2016 13:30 277 Hoonhay Rd Heathcote River Wastewater main Blockage
12/02/2016 10:40 12/02/2016 11:40 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour Overflow from Manhole
3/2/2016 12:00 noon 3/2/2016 13:00 55 Cashmere Road Heathcote River Blocked Sewer
19/1/2016 09:43 19/1/16 10:45 Corner Major Aitken Dr and Centaurus Road Heathcote River Blocked Sewer

2015

Discharge began Discharge ceased Overflow location Waterway affected Cause
29/12/2015 18:30 29/12/2015 21:00 Corner of Owles Terrace and Hardy Street Avon River Temporary overland sewer pipe split
31/10/2015 17:30 31/10/2015 11 Coppell Place, Halswell Heathcote River Blocked Manhole
23/10/2015 17:30 23/10/2015 19:00 10 Dyers Pass Road Heathcote River Blocked Sewer
13/10/2015 07:14 13/10/2015 12:30 Akaroa Wastewater Treatment Plant Akaroa Harbour UV treatment fault
13/10/2015 07:30  13/10/2015 11:00 9 Richmond Hill Road Sumner Beach Blocked Sewer
10/10/2015 10:16 10/10/2015 11:30 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour Power Outage disrupted UV treatment
10/10/2015 10:16 10/10/2015 11:30 Governors Bay Wastewater Treatment Plant Lyttelton Harbour Power Outage disrupted UV treatment
10/10/2015 10:16 10/10/2015 11:30 Duvauchelle Wastewater Treatment Plant Akaroa Harbour Power Outage disrupted UV treatment
10/10/2015 10:16 10/10/2015 14:10 Akaroa Fire Station Akaroa Harbour Power Outage stopped Pump Station 615
23/09/2015 14:00  23/09/15 15:50 174 Clarence Street Avon River Excessive rainfall intrusion
22/08/2015 time unknown 23/08/2015 13:00 71 Cashmere Road Heathcote River Blocked sewer
13/08/2015 09:00 13/08/2015 11:15 Whitewash Head Rd and Scarborough Hill Rd    Sumner Beach Blocked sewer
24/07/2015 09:00 24/7/15 09:30 26 Centaurus Road Heathcote River Sewer blockage on Kidson Terrace
18/07/2015 14:30 20/7/2015 10:00 Duvauchelles Wastewater Treatment Plant  Akaroa Harbour Failure of UV treatment equipment
06/07/2015 14:00  06/07/2015 23:59 Kilmore Street Bridge Avon River Pipe failure
20/06/2015 13:44 20/06/2015 14:30 49 Beach Road Akaroa Harbour Pipe blockage
19/06/2015 02:00 19/06/2015 09:00 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour Excessive rainfall intrusion
19/06/2015 02:00 19/06/2015 09:00 Lyttelton Waste Water Lyttelton Harbour Excessive rainfall intrusion
04/06/2015 04:00 04/06/2015 16:00 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour Excessive rainfall intrusion
04/06/2015 10:00 04/06/2015 15:00 21 Ranui Street Diamond Harbour  Lyttelton Harbour Excessive rainfall intrusion
04/06/2015 14:00 04/06/2015 14:30 Lyttelton Wastewater Treatment Plant Lyttelton Harbour Excessive rainfall intrusion
04/06/2015 10:37 04/06/2015 13:16 Fisher Ave and Eastern Terrace Heathcote River Excessive rainfall intrusion
23/04/2015 07:30 23/04/2015 08:45 Corner of Churchill St and Cambridge Tce Avon River Blocked sewer
15/04/2015 14:30 15/04/2015 14:40 120 Scarborough Hill Road Lyttelton Harbour Sewer overflow from manhole
18/03/2015 08:00 18/03/2015 08:15 13 Clifton Terrace Avon Heathcote Estuary/Sumner Beach Blocked sewer main
09/03/2015 16:50 09/03/2015 17:20 38 Park Terrace Avon River Overflow from manhole
08/02/2015 09:50 08/02/2015 11:30 47 Rue Balguerie Akaroa Harbour Contractor works failure
06/02/2015 10:05 06/02/2015 11:00 46 Yardley Street Avon River Blocked sewer main

2014

2013

2012