A wastewater overflow is when sewage flows out from the pipes or manholes where it is usually contained, due to an incident, and into the stormwater system, which then drains into a stream, river or the sea.
Wastewater overflow details are listed below. Information will be updated as soon as possible. If you see signs about polluted water around the city and have further questions, please contact us(external link)
This is a manual process, so there may be delays during busy periods. Event identification (ID) numbers are not consecutive, due to false alarms, etc. Pollution may take up to two days to completely clear after the discharge has ceased.
Discharge began | Discharge ceased | ID | Overflow location | Receiving waterway | Cause |
25 December 6pm | 25 December 7.05pm | 478 | 270 Sparks Road, Halswell | Heathcote River | Vandalism |
11 December 8.40am | 11 December 9.10am | 477 | 14 Otamahua Lane, Diamond Harbour | Lyttelton Harbour | Pump broken |
9 November 10.30am | 9 November 3.30pm | 476 | Hamish Hay Bridge, Victoria Square | Avon River | Cross connection |
2 November 1.30pm | 2 November 4pm | 475 | Red Zone, Avonside Drive | Avon River | Powercut |
24 October 1am | 24 October 11.20am | 474 | Seagar Lane, Hillmorton | Heathcote River | Blockage - fat |
24 October 9.45am | 24 October 10.30am | 473 | Clarendon Terrace, Woolston | Heathcote River | Pipe joint malfunction |
14 October 11.59pm | 15 October 12.40pm | 472 | Tikao Bay Beach | Akaroa Harbour | Powercut |
30 September midnight | 4 October 9.50am | 471 | Rawhiti Street, Diamond Harbour | Lyttelton Harbour | Broken clay pipe |
15 September 7.30am | 15 September 2pm | 470 | Drayton Reserve | Ihutai Estuary | Blocked pipe – roots |
14 August 7pm | 14 August 8.30pm | 469 | Sutherlands Road, Cashmere | Heathcote River | Pressure line fault |
13 August 9am | 13 August 1pm | 468 | 86 Worcester Street | Avon River | Pipe blockage – gravel |
7 August 9am | 7 August 11.45am | 467 | Ramahana Road, Huntsbury | Heathcote River | Pipe blockage – rags |
22 July 11.30pm | 24 July 8am | 466 | Thames Street / Malvern Street | Avon River | Heavy rain |
22 July 11.30pm | 23 July 3.30am | 465 | Grassmere Street / Rutland Street Park, St Albans | Avon River | Heavy rain |
23 July 12.15am | 25 July 1.15am | 464 | Heathcote | Milns Reserve | Heavy rain |
22 July 6pm | 24 July 3.30pm | 463 | Sandwich Road / Eastern Terrace | Heathcote River |
Heavy rain |
23 July 1.20am | 23 July 12pm | 462 | Waltham Road / Eastern Terrace | Heathcote River | Heavy rain |
23 July 12.55am | 24 July 9am | 461 | Pamela Street / Chelsea Street | Ihutai Estuary | Heavy rain |
23 July 12.15am | 24 July 1.15am | 460 | Halswell | Milns Reserve | Heavy rain |
23 July 12.20am | 23 July 3.15am | 459 | Grassmere Street / Rutland Street Park, St Albans | Avon River | Heavy rain |
23 July 12.15am | 24 July 8am | 458 | Thames Street / Malvern Street | Avon River | Heavy rain |
22 July 11.10pm | 23 July 12pm | 457 | Waltham Road / Eastern Terrace | Heathcote River | Heavy rain |
22 July 7.45pm | 24 July 2am | 456 | Fisher Ave / Eastern Terrace | Heathcote River | Heavy rain |
22 July 7.15pm | 24 July 4pm | 455 | Beach Road, Akaroa | Akaroa Harbour | Heavy rain |
22 July 4pm | 24 July 12.45am | 454 | Recreation Ground, Akaroa | Akaroa Harbour | Heavy rain |
17 July 6pm | 17 July 7.40pm | 453 | Louisson Place, Opawa | Heathcote River | Blocked pipe – roots |
9 July 7pm | 9 July 11.30pm | 452 | Sandwich Road / Eastern Terrace | Heathcote River | Heavy rain |
9 July 2pm | 9 July 5pm | 451 | Akaroa Recreation Ground | Akaroa Harbour | Heavy rain |
9 July 8am | 9 July 3pm | 450 | Duvauchelle Petrol Station | Akaroa Harbour | Heavy rain |
6 July 1pm | 6 July 5pm | 449 | Cressy Terrace, Corsair Bay | Lyttelton Harbour | Blocked pipe |
29 June 8am | 29 June 8.30am | 448 | Eastern Terrace end of the Bowenvale Ave Bridge | Heathcote River | Blocked pipe |
21 June 10.30am | 21 June 11.30am | 447 | Bellvue Ave, Papanui | Dudley Creek | Blocked pipe (by rags) |
14 June 10am | 14 June 11am | 446 | Opposite 2 Heberden Ave | Sumner Beach | Blocked pipe |
28 May 5pm | 28 May 5.30pm | 445 | Corner of Hay Street and McGregors Road | Ihutai Estuary | Leaking valve |
26 May 1.10pm | 26 May 6.30pm | 444 | Opposite 254 Springs Road | Heathcote River | Broken pipe |
19 April 8.10am | 18 April 5.30pm | 443 | Opposite 179 Beach Road | Akaroa Harbour | Broken clay pipe |
3 April 5.10pm | 3 April 7pm | 441 | Naval Point Pump Station | Lyttelton Harbour | Blockage of rags |
22 March 11am | 22 March 11.45am | 440 | 51 Tikao Bay Road | Akaroa Harbour | Wet weather |
22 March 2.10am | 24 March 12.30pm | 439 | Corner of Eastern Tce and Tennyson Street | Heathcote River | Wet weather |
22 March 1.40am | 24 March 11am | 438 | Corner of Eastern Tce and Waltham Road | Heathcote River | Wet weather |
21 March 6.10pm | 21 March 6.30pm | 437 | Duvauchelle Petrol Station | Akaroa Harbour | Wet weather |
15 March 5.30pm | 15 March 6.45pm | 436 | Beckenham Park | Heathcote River | Blocked sewer |
26 February 2.15pm | 26 February 2.45pm | 435 | Opposite 3A Centaurus Road | Heathcote | Blocked sewer |
22 February 3.30pm | 22 February 4.15pm | 434 | Opposite 22 Godley Quay | Lyttelton Harbour | Burst pipe |
7 February 3.30pm | 9 February 3pm | 432 | Opposite 181 Beach Road | Akaroa Harbour | Broken clay pipe |