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 as soon as possible, and once discharge has ceased. Pollution may take up to two days to completely clear after the discharge has ceased. 

2018 overflows

Discharge began Discharge ceased Overflow location Waterway affected Cause
12/10/2018 13:46 12/10/2018 14:25 39 Harbour Tce, Cass Bay Lyttelton Harbour Blocked Sewer
25/9/2018 14:30 25/9/2018 16:45 Cnr Esplanade and Hardwicke St Sumner Beach Burst air valve on pressure main.
3/9/2018 11:30 3/9/2018 12:30 PS118/1 135 McFaddens Road Avon River High Rainfall
3/9/2018 10:22 3/9/2018 13:56 108 Hunter Terrace Heathcote River High Rainfall
3/9/2018 07:55 3/9/2018 13:00 PS20/3 Tennyson St cnr of Eastern Terrace Heathcote River High Rainfall
3/9/2018 06:10 3/9/2018 14:45 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour High Rainfall
16/7/2018 07:30 16/7/2018 12:00 Duvauchelle Wastewater Treatment Plant Akaroa Harbour High Tide combined with High Rain
4/7/2018 10:00 4/7/2018 12:00 Near Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour Burst Water Main damaged Sewer Line
13/6/2018 08:46 14/6/2018 05:46 Deans Ave Riccarton Stream to Avon River High Rainfall
13/6/2018 09:30 13/6/2018 14:45 PS6/3 Thames St cnr of Malvern St Tay Street Drain High Rainfall
13/6/2018 07:59 13/6/2018 14:50 PS20/3 Tennyson St cnr of Eastern Terrace Heathcote River High Rainfall
13/6/2018 08:30 13/6/2018 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour High Rainfall
6/6/2018 03:05  6/6/2018 04:00 PS20/4 Fisher Ave Heathcote River High Rainfall
6/6/2018 05:30 7/6/2018 23:00 Diamond Harbour Wastewater Treatment Plant Lyttelton Harbour High Rainfall caused Aerator Failure
26/5/2018 23:00 27/5/2018 02:30 Diamond Harbour Recreation Ground Lyttelton Harbour Valve failure at Pump Station
25/5/2018 21:30 25/5/2018 23:00 89 Slater St, Richmond Dudley Creek to Avon River 3rd Party Damage/Contractor Error
1/5/2018 12:00 1/5/2018 13:15 Lambeth Crescent and Fenchurch St corner Dowalls Drain to Styx River Blocked Sewer
25/4/2018 09:00 25/4/2018 10:00 54 Oxford St, Lyttelton Lyttelton Harbour Blocked Sewer
1/3/2018 10:15 1/3/2018 11:45 Bayview Place, Cass Bay Lyttelton Harbour Blocked Sewer
23/2/2018 08:45 23/2/2018 11:30 Jetty Road, Governors Bay Lyttelton Harbour Blocked Sewer
20/2/2018 21/2/2018 90 Grants Road Papanui Creek to Dudley Creek to Avon River High Rainfall
21/2/2018 07:50 21/2/2018 PS616, 259 Beach Road Akaroa Harbour High Rainfall
20/2/2018 23:00 21/2/2018 PS615, Fire Station Akaroa Harbour High Rainfall
20/2/2018 19:10 21/2/2018 01:55 PS20/1, Corner of Locarno St and Fifield Terrace Heathcote River High Rainfall
20/2/2018 23:38 21/2/2018 17:24 PS112/1, 47 Kibblewhite Street Avon River High Rainfall
21/2/2018 01:00 21/2/2018 10:00  PS37/1 178a Estuary Road Avon Heathcote Estuary High Rainfall
20/2/2018 21:00 20/2/2018 23:30 P1/21 Grassmere, 133 Paparoa Street Avon River High Rainfall
20/2/2018 21:30 21/2/2018 02:48 P6/3 Thames, 70 Thames St Avon River High Rainfall
20/2/2018 23:00 21/2/2018 05:00 Oakford Close/Deans Ave Riccarton Stream/Avon River High Rainfall
20/2/2018 19:48 21/2/2018 05:51 PS13/1 Tilford, 12 Richardson Terrace Heathcote River High Rainfall
20/2/2018 22:30 20/2/2018 23:30 PS130/1, 5 Lomond Place Linwood Canal/Avon Heathcote Estuary Pump Fault and High Rainfall
20/2/2018 22:00 20/2/2018 23:59 PS20/4 Fisher Ave Heathcote River High Rainfall
20/2/2018 21:21 21/2/2018 01:57 PS31/1 Barnet Park Avon Heathcote Estuary High Rainfall
20/2/2018 22:50 20/2/2018 01:44  PS1/15 St Andrews, Corner Shrewsbury St and Carlton Mill Rd Avon River High Rainfall
6/1/2018 10:53 6/1/2018 14:00 PS616 The Glen, Akaroa Akaroa Harbour High tide flooded sewer
4/1/2018 09:00 4/1/2018 15:00 Kilmore Street Bridge Avon River Pipe Fault
2/1/2018 10:00 3/1/2018 11:00 229 Beach Road, Akaroa Akaroa Harbour Pipe Fault

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.

Note: All overflow incidents will be recorded in the table above.