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We get information about overflowing CSOs since January 2025. Here is a chart of the last three months of data for Wirral West, here you can see overflows in red, the darker the red, the more the CSO overflowed that day.
Each CSO has a row, the most recent data is on the right hand side.
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Donate Now| Company | Site Name | Receiving Waterway | Overflow Days | Total Duration (hours) | Total Duration (days) |
|---|---|---|---|---|---|
| United Utilities | North Wirral WwTW (Meols) | Liverpool Bay | 37 | 743 h 56m | 30.96 |
| United Utilities | North Wirral WwTW (Meols) | Liverpool Bay | 105 | 611 h 2m | 25.46 |
| United Utilities | North Wirral WwTW (Meols) | Liverpool Bay | 14 | 237 h 15m | 9.88 |
| United Utilities | North Wirral WwTW (Meols) | Liverpool Bay | 39 | 195 h 12m | 8.12 |
| United Utilities | Arrowe Road / Arrowe Brook Lane CSO | Arrowe Brook River Birket | 30 | 111 h 51m | 4.62 |
| United Utilities | Harrington Avenue CSO | Carr Drain | 29 | 106 h 54m | 4.42 |
| United Utilities | Barnston Storm Tanks (51CSO065) | Prenton Brook | 19 | 100 h 4m | 4.17 |
| United Utilities | Whitebeam Walk CSO | Greasby Brook Arrow Brook | 25 | 68 h 16m | 2.83 |
| Dwr Cymru Welsh Water | Heswall WwTW Storm Overflow | Estuarial Waters of the River Dee | 12 | 68 h | 2.83 |
| Dwr Cymru Welsh Water | Seabank Road Heswall Storm Overflow | River Dee Estuary | 36 | 67 h 21m | 2.79 |
| United Utilities | Outside 81 Wood Lane CSO | Arrowe Brook | 9 | 33 h 40m | 1.38 |
| United Utilities | Thornton Hough PS | Thornton Hough, Clatter | 14 | 26 h 49m | 1.08 |
| United Utilities | Frankby Close CSO | Greasby Brook | 14 | 26 h 32m | 1.08 |
| United Utilities | Greasby Road/ Cortsway Combined Sewer Overflow (Site ID 511WQ) (WIR0085) | Arrowe Brook | 5 | 24 h | 1 |
| United Utilities | Harrington Avenue CSO | Carr Drain | 6 | 16 h 2m | 0.67 |
| Dwr Cymru Welsh Water | Riverbank Road Heswall Storm Overflow | Estuarial Waters of the River Dee | 5 | 11 h 15m | 0.46 |
| United Utilities | Arrowe Road / Arrowe Brook Lane CSO | Arrowe Brook River Birket | 4 | 9 h 27m | 0.38 |
| United Utilities | Barnston Storm Tanks (51CSO065) | Prenton Brook | 2 | 8 h 44m | 0.33 |
| United Utilities | Whitebeam Walk CSO | Greasby Brook Arrow Brook | 4 | 7 h 2m | 0.29 |
| Dwr Cymru Welsh Water | Heswall Cottage Lane Storm Overflow | River Dee | 2 | 5 h | 0.21 |
| United Utilities | Thornton Hough PS | Thornton Hough, Clatter | 2 | 4 h 36m | 0.17 |
| Dwr Cymru Welsh Water | Park West Heswall Overflow | River Dee | 3 | 3 h 55m | 0.12 |
| United Utilities | Rear of 65 Fulton Avenue CSO | Newton Brook | 2 | 2 h 22m | 0.08 |
| United Utilities | Outside 81 Wood Lane CSO | Arrowe Brook | 4 | 1 h 58m | 0.04 |
| United Utilities | Frankby Close CSO | Greasby Brook | 2 | 1 h 6m | 0.04 |
| United Utilities | Westbourne Rd CSO (512ZA) | Dee Estuary | 1 | 1 h 6m | 0.04 |
| United Utilities | Rear of 65 Fulton Avenue CSO | Newton Brook | 1 | 0 h 26m | 0 |
| United Utilities | Black Horse Hill CSO | Newton Brook River Birket | 1 | 0 h 20m | 0 |
| United Utilities | Greasby Road/ Cortsway Combined Sewer Overflow (Site ID 511WQ) (WIR0085) | Arrowe Brook | 1 | 0 h 12m | 0 |
| United Utilities | Stanley Road Pumping Station (Site ID 51005) (WIR0090) | River Birket | 0 | 0 h | 0 |
| United Utilities | Stanley Road Pumping Station (Site ID 51005) (WIR0090) | River Birket | 0 | 0 h | 0 |
| United Utilities | West Kirkby Pumping Station (Site ID 51001) (WIR0092) | Foxholes Brook | 0 | 0 h | 0 |
| United Utilities | Westbourne Rd CSO (512ZA) | Dee Estuary | 0 | 0 h | 0 |
| United Utilities | Ennisdale Drive CSO | Newton Brook | 0 | 0 h | 0 |
| United Utilities | West Kirkby Pumping Station (Site ID 51001) (WIR0092) | Foxholes Brook | 0 | 0 h | 0 |
| United Utilities | Long Hey Road CSO | River Dee | 0 | 0 h | 0 |
| United Utilities | Croft Drive/Shore Road CSO | River Dee Estuary | 0 | 0 h | 0 |
| United Utilities | Croft Drive/Shore Road CSO | River Dee Estuary | 0 | 0 h | 0 |
| United Utilities | Black Horse Hill CSO | Newton Brook River Birket | 0 | 0 h | 0 |
| United Utilities | Long Hey Road CSO | River Dee | 0 | 0 h | 0 |
EDM (Event Duration Monitoring) data and Consented Discharges to Controlled Waters with Conditions from Environment Agency & Data Map Wales, and Scottish Water
Experimental derived data from Thames Water API, Some data may be missing or inaccurate. Live sewage data from Stream Water API
Uses Environment Agency rainfall data from the real-time data API (Beta) - Rainfall data is delayed by up to two days.
This website is intended to provide an accurate representation of the Environment Agency data. The data is hard to use, and thus some errors may have been made. If you find something that is incorrect, please raise an issue at the GitHub issues page and we'll endeavour to fix it quickly.
This project is not associated, approved or endorsed by any of the companies whose logos you see here.
Get in touch if you have queries or want to discuss our data.
press [at] top-of-the-poops.org