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Polluted by sewage 14,510 hours in 2025 - That's 1.68 years
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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 Tatton, 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 | WILMSLOW WwTW | River Dean | 141 | 2,662 h 4m | 110.92 |
| United Utilities | 42 Runcorn Road CSO | Weaver Navigation | 94 | 2,033 h 8m | 84.71 |
| United Utilities | ALDERLEY EDGE WwTW | Whitehall Brook | 87 | 959 h 12m | 39.96 |
| United Utilities | MOBBERLEY WwTW | Mobberley Brook | 54 | 588 h 58m | 24.5 |
| United Utilities | Town Lane CSO | Mobberley Brook Rv Bollin | 72 | 576 h 52m | 24 |
| United Utilities | Hale Storm Tanks and WwPPS | River Bollin | 35 | 490 h 23m | 20.42 |
| United Utilities | Dean Road CSO | River Dean | 20 | 445 h 34m | 18.54 |
| United Utilities | KNUTSFORD WwTW | Birkin Brook | 67 | 440 h 50m | 18.33 |
| United Utilities | Ollershaw Lane PS | Witton Brook | 30 | 427 h 53m | 17.79 |
| United Utilities | ALDERLEY EDGE WwTW | Whitehall Brook | 26 | 396 h 29m | 16.5 |
| United Utilities | Hale Storm Tanks and WwPPS | River Bollin | 28 | 356 h 29m | 14.83 |
| United Utilities | Town Lane CSO | Mobberley Brook Rv Bollin | 27 | 356 h 25m | 14.83 |
| United Utilities | Alderley Edge WwTW CSO MAC0174 | Carr Brook | 42 | 307 h 16m | 12.79 |
| United Utilities | WILMSLOW WwTW | River Dean | 20 | 283 h 32m | 11.79 |
| United Utilities | Dane Bank Road CSO | Slitten Brook | 61 | 254 h 14m | 10.58 |
| United Utilities | MOBBERLEY WwTW | Mobberley Brook | 20 | 252 h 21m | 10.5 |
| United Utilities | NETHER PEOVER WwTW | Crow Brook | 18 | 242 h 41m | 10.08 |
| United Utilities | Tabley WWTW | Tabley Brook | 24 | 224 h 28m | 9.33 |
| United Utilities | Alderley Edge WwTW CSO MAC0174 | Carr Brook | 19 | 173 h 50m | 7.21 |
| United Utilities | KNUTSFORD WwTW | Birkin Brook | 21 | 170 h 30m | 7.08 |
| United Utilities | Ollershaw Lane PS | Witton Brook | 9 | 164 h 16m | 6.83 |
| United Utilities | WILMSLOW WwTW | River Dean | 40 | 155 h 53m | 6.46 |
| United Utilities | Sproston WWTW | River Croco | 25 | 136 h 24m | 5.67 |
| United Utilities | Sow Brook PS | Sow Brook | 11 | 131 h 56m | 5.46 |
| United Utilities | Hale Storm Tanks and WwPPS | River Bollin | 52 | 122 h | 5.08 |
| United Utilities | MOBBERLEY WwTW | Mobberley Brook | 51 | 117 h 59m | 4.88 |
| United Utilities | Ollerton PS | Marthall Brook | 19 | 115 h 32m | 4.79 |
| United Utilities | NETHER PEOVER WwTW | Crow Brook | 7 | 111 h 54m | 4.62 |
| United Utilities | HIGH LEGH WwTW | Agden Brook | 14 | 110 h 8m | 4.58 |
| United Utilities | Rear of Knowle House CSO | River Dean | 34 | 103 h 56m | 4.29 |
| United Utilities | Tabley WWTW | Tabley Brook | 17 | 101 h 16m | 4.21 |
| United Utilities | Comberbach PS | Kid | 13 | 89 h 26m | 3.71 |
| United Utilities | GREEN DRAGON HOTEL CSO | River Bollin | 15 | 85 h 35m | 3.54 |
| United Utilities | Ollerton PS | Marthall Brook | 12 | 84 h 1m | 3.5 |
| United Utilities | Rear of No. XXX Bridgewater Street CSO | Slitten Brook | 29 | 78 h 12m | 3.25 |
| United Utilities | St Johns Road CSO | Birkin Brook Via Sws | 30 | 76 h 22m | 3.17 |
| United Utilities | Middlewich Road/Parkfield Road CSO | River Dane Via Sws | 43 | 72 h 12m | 3 |
| United Utilities | CHANCEL LANE CSO | River Bollin | 34 | 69 h 30m | 2.88 |
| United Utilities | WILMSLOW WwTW | River Dean | 13 | 67 h 15m | 2.79 |
| United Utilities | Sproston WWTW | River Croco | 21 | 56 h 6m | 2.33 |
| United Utilities | QUARRY BANK MILL CSO | River Bollin | 13 | 48 h 42m | 2 |
| United Utilities | Reeman Court (Manhole H4) | River Dean | 9 | 48 h 4m | 2 |
| United Utilities | Bexton Road CSO | Serpentine Water | 30 | 47 h 30m | 1.96 |
| United Utilities | Fulshaw Cross CSO | Whitehall Brook Via Sws | 26 | 47 h 5m | 1.96 |
| United Utilities | Hale Storm Tanks and WwPPS | River Bollin | 13 | 42 h 40m | 1.75 |
| United Utilities | Dane Bank Road CSO | Slitten Brook | 16 | 40 h 34m | 1.67 |
| United Utilities | PLUMLEY WwTW | Peover Eye | 33 | 39 h | 1.62 |
| United Utilities | Sandle Bridge Wastewater Network PS | Pedley Brook | 5 | 37 h 50m | 1.54 |
| United Utilities | Rear 237 Runcorn Road CSO | Trent And Mersey Canal | 18 | 37 h 20m | 1.54 |
| United Utilities | Knutsford Main PS | Moor Pool | 12 | 35 h 41m | 1.46 |
| United Utilities | The Wilmslow Park Road CSO | Whitfield Brook | 13 | 34 h 14m | 1.42 |
| United Utilities | MOBBERLEY WwTW | Mobberley Brook | 11 | 34 h 12m | 1.42 |
| United Utilities | Rear of Knowle House CSO | River Dean | 11 | 33 h 2m | 1.38 |
| United Utilities | CHANCEL LANE CSO | River Bollin | 11 | 25 h 54m | 1.04 |
| United Utilities | Fulshaw Cross CSO | Whitehall Brook Via Sws | 11 | 24 h 34m | 1 |
| United Utilities | St Johns Road CSO | Birkin Brook Via Sws | 11 | 22 h 48m | 0.92 |
| United Utilities | Sow Brook PS | Sow Brook | 2 | 18 h 36m | 0.75 |
| United Utilities | QUARRY BANK MILL CSO | River Bollin | 4 | 14 h 44m | 0.58 |
| United Utilities | Middlewich Road/Parkfield Road CSO | River Dane Via Sws | 8 | 14 h | 0.58 |
| United Utilities | HIGH LEGH WwTW | Agden Brook | 5 | 13 h 53m | 0.54 |
| United Utilities | Rear of No. XXX Bridgewater Street CSO | Slitten Brook | 2 | 13 h 46m | 0.54 |
| United Utilities | Sandle Bridge Wastewater Network PS | Pedley Brook | 2 | 13 h 38m | 0.54 |
| United Utilities | Bexton Road CSO | Serpentine Water | 11 | 13 h 32m | 0.54 |
| United Utilities | Comberbach PS | Kid | 1 | 13 h 23m | 0.54 |
| United Utilities | Wilmslow Park South Combined Sewer Overflow (Site ID 272YI) (MAC0047) | River Bollin | 2 | 10 h 16m | 0.42 |
| United Utilities | Hoo Green WwTW | Tabley Brook | 6 | 8 h 52m | 0.33 |
| United Utilities | OWLEY WOOD ROAD CSO | River Weaver | 14 | 8 h 2m | 0.33 |
| United Utilities | Eagle Brow CSO (489KT) | River Mersey | 7 | 7 h 34m | 0.29 |
| United Utilities | The Wilmslow Park Road CSO | Whitfield Brook | 3 | 6 h 36m | 0.25 |
| United Utilities | Opp River Street CSO | River Bollin | 3 | 6 h 32m | 0.25 |
| United Utilities | THE CARRS CSO | River Bollin | 1 | 6 h 12m | 0.25 |
| United Utilities | Poplar Cottages CSO | Kid Brook Via Sws | 4 | 6 h 10m | 0.25 |
| United Utilities | Oughtrington Lane CSO | Bridgewater Canal | 2 | 6 h 6m | 0.25 |
| United Utilities | Knutsford Main PS | Moor Pool | 1 | 5 h 49m | 0.21 |
| United Utilities | PLUMLEY WwTW | Peover Eye | 8 | 5 h 19m | 0.21 |
| United Utilities | Mobberley Road Combined Sewer Overflow (Site ID 272GZ) (MAC0122) | Birkin Brook | 4 | 5 h 6m | 0.21 |
| United Utilities | Hawthorn Lane | Clvrt'D River Bollin | 7 | 4 h 30m | 0.17 |
| United Utilities | Woodlands Grove CSO | Trent | 6 | 4 h 14m | 0.17 |
| United Utilities | OWLEY WOOD ROAD CSO | River Weaver | 4 | 4 h | 0.17 |
| United Utilities | THE CARRS CSO | River Bollin | 1 | 2 h 12m | 0.08 |
| United Utilities | GREEN DRAGON HOTEL CSO | River Bollin | 3 | 2 h 6m | 0.08 |
| United Utilities | Rear 237 Runcorn Road CSO | Trent And Mersey Canal | 3 | 1 h 40m | 0.04 |
| United Utilities | Opp River Street CSO | River Bollin | 1 | 0 h 40m | 0 |
| United Utilities | Hawthorn Lane | Clvrt'D River Bollin | 2 | 0 h 22m | 0 |
| United Utilities | Eagle Brow CSO (489KT) | River Mersey | 1 | 0 h 10m | 0 |
| United Utilities | Rear of 68 Whitbarrow Road | M/Chester Ship Canal | 1 | 0 h 4m | 0 |
| United Utilities | Woodlands Grove CSO | Trent | 1 | 0 h 2m | 0 |
| United Utilities | Rear of 68 Whitbarrow Road | M/Chester Ship Canal | 1 | 0 h 2m | 0 |
| United Utilities | Wilmslow Park South Combined Sewer Overflow (Site ID 272YI) (MAC0047) | River Bollin | 0 | 0 h | 0 |
| United Utilities | Mobberley Road Combined Sewer Overflow (Site ID 272GZ) (MAC0122) | Birkin Brook | 0 | 0 h | 0 |
| United Utilities | Sagars Rd CSO (279DF) | Dean Brook | 0 | 0 h | 0 |
| United Utilities | Dean Road CSO | River Dean | 0 | 0 h | 0 |
| United Utilities | Sagars Rd CSO (279DF) | Dean Brook | 0 | 0 h | 0 |
| United Utilities | Manchester Road (Lostock) CSO | Wincham Brook | 0 | 0 h | 0 |
| United Utilities | Manchester Road (Lostock) CSO | Wincham Brook | 0 | 0 h | 0 |
| United Utilities | Reeman Court (Manhole H4) | River Dean | 0 | 0 h | 0 |
| United Utilities | 42 Runcorn Road CSO | Weaver Navigation | 0 | 0 h | 0 |
| United Utilities | Oughtrington Lane CSO | Bridgewater Canal | 0 | 0 h | 0 |
| United Utilities | Anderton Field No. 28 | Marbury Brook | 0 | 0 h | 0 |
| United Utilities | Poplar Cottages CSO | Kid Brook Via Sws | 0 | 0 h | 0 |
| United Utilities | Anderton Field No. 28 | Marbury Brook | 0 | 0 h | 0 |
| United Utilities | Hoo Green WwTW | Tabley Brook | 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