Polluted by sewage 6,097 hours in 2025
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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 Ashton-under-Lyne, 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 | 250 metres d/s Ashton Road (Bardsley PS) CSO | River Medlock | 80 | 1,757 h 3m | 73.21 |
| United Utilities | DUKINFIELD WwTW | River Tame | 69 | 852 h 47m | 35.5 |
| United Utilities | ASHTON-UNDER-LYNE WwTW | River Tame | 42 | 669 h 22m | 27.88 |
| United Utilities | DUKINFIELD WwTW | River Tame | 38 | 317 h 26m | 13.21 |
| United Utilities | DUKINFIELD WwTW | River Tame | 20 | 247 h 33m | 10.29 |
| United Utilities | ASHTON-UNDER-LYNE WwTW | River Tame | 28 | 207 h 1m | 8.62 |
| United Utilities | Clayton Bridge CSO | River Medlock | 38 | 175 h 16m | 7.29 |
| United Utilities | Broomstair Road CSO | River Tame | 27 | 165 h 52m | 6.88 |
| United Utilities | Turner Lane/Alexandra Road CSO | River Tame | 55 | 160 h 40m | 6.67 |
| United Utilities | Wharf Street CSO | River Mersey | 46 | 151 h 24m | 6.29 |
| United Utilities | ASHTON-UNDER-LYNE WwTW | River Tame | 13 | 138 h 16m | 5.75 |
| United Utilities | ASHTON-UNDER-LYNE WwTW | River Tame | 15 | 101 h 51m | 4.21 |
| United Utilities | Broadoak/Lyndhurst Avenue CSO | Taunton | 41 | 101 h 51m | 4.21 |
| United Utilities | Lower Wharf Street/Scotland Street CSO | River Tame | 44 | 92 h 35m | 3.83 |
| United Utilities | Pottinger Street/Oxford Street CSO | River Tame | 43 | 90 h 45m | 3.75 |
| United Utilities | Newmarket Road PS | Taunton Brook, Medlock | 25 | 84 h 38m | 3.5 |
| United Utilities | Chappell Road CSO | Lumb Brook | 39 | 80 h 50m | 3.33 |
| United Utilities | Clayton Bridge CSO | River Medlock | 15 | 67 h 56m | 2.79 |
| United Utilities | LOWER WHARF STREET CSO | River Tame | 45 | 67 h 6m | 2.79 |
| United Utilities | Lumb Lane (Audenshaw) CSO and Detention Tank | Carr Brook Via Sws | 10 | 63 h 4m | 2.62 |
| United Utilities | Broomstair Road CSO | River Tame | 13 | 57 h 38m | 2.38 |
| United Utilities | Wharf Street CSO | River Mersey | 12 | 51 h 24m | 2.12 |
| United Utilities | Turner Lane/Alexandra Road CSO | River Tame | 14 | 40 h 52m | 1.67 |
| United Utilities | Edward Street (Dunkinfield) CSO | River Tame Via Sws | 25 | 35 h 42m | 1.46 |
| United Utilities | Coal Pit Lane CSO | Kebbs Brook, Riv Darwen | 17 | 35 h 34m | 1.46 |
| United Utilities | DUKINFIELD WwTW | River Tame | 10 | 35 h 3m | 1.46 |
| United Utilities | LOWER WHARF STREET CSO | River Tame | 15 | 34 h 50m | 1.42 |
| United Utilities | Broadoak/Lyndhurst Avenue CSO | Taunton | 9 | 31 h 29m | 1.29 |
| United Utilities | Lower Wharf Street/Scotland Street CSO | River Tame | 8 | 26 h 26m | 1.08 |
| United Utilities | Chappell Road CSO | Lumb Brook | 9 | 24 h 10m | 1 |
| United Utilities | Gambrel Bank Road CSO | Downshaw Brook | 16 | 21 h 50m | 0.88 |
| United Utilities | Newmarket Road PS | Taunton Brook, Medlock | 6 | 20 h 14m | 0.83 |
| United Utilities | Pottinger Street/Oxford Street CSO | River Tame | 9 | 19 h 23m | 0.79 |
| United Utilities | Lumb Lane (Audenshaw) CSO and Detention Tank | Carr Brook Via Sws | 1 | 10 h 16m | 0.42 |
| United Utilities | Hathershaw Playing Field | River Medlock | 4 | 10 h 16m | 0.42 |
| United Utilities | Medlock Sports Centre CSO | Lumb Brook Via Surface Wtr Sew | 4 | 9 h 55m | 0.38 |
| United Utilities | Green Lane/Lyndhurst Avenue CSO | Smallshaw Brook | 6 | 7 h 58m | 0.29 |
| United Utilities | Greenwood Avenue/Platt Avenue CSO | Smallshaw Brook Via Sws | 3 | 7 h 34m | 0.29 |
| United Utilities | Coal Pit Lane CSO | Kebbs Brook, Riv Darwen | 2 | 7 h 22m | 0.29 |
| United Utilities | Edward Street (Dunkinfield) CSO | River Tame Via Sws | 5 | 5 h 36m | 0.21 |
| United Utilities | Dukinfield Outfall Sewer CSO | River Tame | 5 | 4 h 54m | 0.17 |
| United Utilities | ASHTON OLD ROAD / MANSHAW STREET CSO | Moss Brook | 6 | 2 h 24m | 0.08 |
| United Utilities | Gambrel Bank Road CSO | Downshaw Brook | 2 | 2 h 10m | 0.08 |
| United Utilities | HARTSHEAD CLOSE / MANSHAW ROAD CSO | Culverted Section Moss Brook | 1 | 0 h 58m | 0 |
| United Utilities | ASHTON OLD ROAD / MANSHAW STREET CSO | Moss Brook | 0 | 0 h | 0 |
| United Utilities | Dukinfield Outfall Sewer CSO | River Tame | 0 | 0 h | 0 |
| United Utilities | HUNTS BANK CSO | River Irk | 0 | 0 h | 0 |
| United Utilities | HARTSHEAD CLOSE / MANSHAW ROAD CSO | Culverted Section Moss Brook | 0 | 0 h | 0 |
| United Utilities | Hathershaw Playing Field | River Medlock | 0 | 0 h | 0 |
| United Utilities | 250 metres d/s Ashton Road (Bardsley PS) CSO | River Medlock | 0 | 0 h | 0 |
| United Utilities | HUNTS BANK CSO | River Irk | 0 | 0 h | 0 |
| United Utilities | Medlock Sports Centre CSO | Lumb Brook Via Surface Wtr Sew | 0 | 0 h | 0 |
| United Utilities | Argyll Street CSO | Cock Brook | 0 | 0 h | 0 |
| United Utilities | Argyll Street CSO | Cock Brook | 0 | 0 h | 0 |
| United Utilities | Greenwood Avenue/Platt Avenue CSO | Smallshaw Brook Via Sws | 0 | 0 h | 0 |
| United Utilities | Green Lane/Lyndhurst Avenue CSO | Smallshaw 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.