Lists of recent and historic wastewater overflows.

2025 overflows

This page will be updated as soon as possible; however, it is a manual process, so there may be delays during busy periods.

If you see signs about polluted water around the city and have further questions, please contact us. Pollution may take up to two days to completely clear after the discharge has ceased.

Event identification (ID) numbers are not consecutive, due to false alarms, etc. 

Overflow reported Overflow ceased ID  Overflow location Receiving waterway Cause
14 February, 7am 14 February, 11am 542 Emerson Crescent Lyttelton Harbour Blockage (condom)
10 March, 2.30pm 10 March, 5pm 543 Cressy Terrace, Lyttelton Lyttelton Harbour Fat blockage
23 March, 5.35pm 23 March, 5.40pm 546 Bridge at Harbour Road West Styx River Burst pipe
30 April, 8am 1 May, 11.15pm 550, 562 Main Road, Moncks Bay Estuary Wet weather
30 April, 6.15pm 4 May, 7.30pm 565, 547 Akaroa Recreation Ground Akaroa Harbour Wet weather
30 April, 6.40pm 2 May, 4.15pm 551, 552, 553,
554,556, 557,
558, 560, 561		 Heathcote River, from
Cashmere down to Ferrymead 		 Heathcote River Wet weather
30 April, 6.20pm 4 May, 8.50pm 548, 566 Akaroa Fire Station Akaroa Harbour Wet weather
1 May, 9am 1 May, 9.40pm 559, 564 Horseshoe Lake Avon River Wet weather
1 May, 9am 1 May, 11am 555 Avon River, at the corner of
Gloucester Street and Avonside Drive		 Avon River Wet weather
1 May, 2pm 1 May, 7.45pm 567 Governors Bay Jetty Road Lyttelton Harbour Wet weather
1 May, 2.50am 2 May, 2.10am 568 Winters Road Drain Avon River Wet weather
1 May, 3.30pm 2 May, 7.30am 573 Duvauchelle Camp Ground Akaroa Harbour Wet weather
2 May, 6am 2 May, 12.30pm 570 Tikao Bay Akaroa Harbour Wet weather
2 May, 8am 3 May, 10pm 571 219 Beach Road Akaroa Harbour Burst pipe
7 June, 12am 13 June, 1.18pm 575 49 Beach Road Akaroa Harbour Wet weather
8 June, 3.59pm 8 June, 4.30pm 576 Between 200 to 300 Hoon Hay Road Heathcote River Wet weather
15 June, 8.45pm 15 June, 10pm 578 Bellvue Ave Dudley Creek Fat blockage
27 June, 3.19pm 27 June, 5.20pm 579 Hawkhurst Road Lyttelton Harbour Fat blockage
28 June, 9.03pm 28 June, 10.35pm 580 Bengal Drive, Cashmere Heathcote River Root blockage
9 July, 3.50pm 9 July, 6.30pm 581 Cottesmore Close, Burnside Hewlings Stream Fat blockage
    582 Tikao Bay Akaroa Harbour Wet weather