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. 

2022 overflows

Discharge began Discharge ceased Overflow location Waterway affected Cause
6 April 9.30am 6 April 12.05pm 118 Rue Jolie, Akaroa Akaroa Harbour  
13 February 6.35am 13 February 7.15am Corner of Eastern Terrace and Sandwich Road Heathcote River High rainfall
13 February 2.20pm 13 February 2.25pm Corner of Eastern Terrace and Tennyson Street Heathcote River High rainfall
13 February 2.30pm 13 February 2.35pm Corner of Anzac Drive and Carisbrook Street Avon River High rainfall
12 February 7.00pm 13 February 8.30pm Dudley Creek Diversion at Rutland Reserve Avon River High rainfall
13 February 12.35am 13 February 9.25pm Linwood Canal at the corner of Linwood Avenue and Hargood Street Estuary High rainfall
12 February 10.15pm 13 February 4.45pm Tay Street Drain at the corner of Thames Street and Malvern Street Avon River High rainfall
12 February 9.40pm 13 February 10.40pm Carton Mill Corner Avon River High rainfall
28 February 4.07pm 28 February 5.00pm Taylors Mistake Beach Pegasus Bay Damaged pipe
4 January 4.00pm 4 January 5.40pm 5 Jetty Road, Governors Bay 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.

All overflow incidents will be recorded in the table above.