It's a Dirty Business

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Sheffield Hallam - 2025 Sewage

Polluted by sewage 1,382 hours in 2025 , monitoring offline 6,857 hours , potential overflows 672 hours

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2024
© Top of the Poops 2021-2024

Which Year?

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✔ means we have live data (𝑥 if not)

View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Sheffield Hallam for 2025. It is an estimate, based on very poor quality live data from the Water Companies. This may not align with the 'official' reported sewage values from the water companies, which is reported in April following then end of the year - so 2025 numbers are reported in April 2026.

What's a potential overflow? If the CSO goes 'Offline' while its Overflowing, we don't know if it stopped overflowing until we get a 'Stop' event.

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Daily Data

Jan - 218 hours , 104 offline
Feb - 15 hours , 609 potential
Mar - 0 hours , 62 potential
Apr - 0 hours
May - 2 hours , 737 offline
Jun - 7 hours , 720 offline
Jul - 14 hours , 744 offline
Aug - 6 hours , 744 offline
Sept - 158 hours , 808 offline
Oct - 50 hours , 744 offline
Nov - 563 hours , 720 offline
Dec - 344 hours , 1,192 offline
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Yorkshire Water MILLHOUSES PARK/CSO/RETENTION/NO 1 COMPARTMENT River Sheaf 38 226 h 55m -
Yorkshire Water BROOKHOUSE HILL/CSO Porter Brook 20 212 h 12m 799 h
Yorkshire Water RIVELIN VALLEY 3/CSO River Rivelin 47 195 h 54m -
Yorkshire Water HANGINGWATER ROAD/CSO Porter Brook 49 161 h 18m -
Yorkshire Water LANGSETT ROAD/CSO River Don 32 117 h 13m -
Yorkshire Water GLEN BRIDGE/CSO River Rivelin 33 107 h 88 h
Yorkshire Water MILLHOUSES PARK/CSO/RETENTION/NO 2 COMPARTMENT River Sheaf 12 75 h 52m -
Yorkshire Water STANNINGTON ROAD/NO 2 CSO Not Matched In Ea Consents Database 38 70 h 38m -
Yorkshire Water WHITELEY WOODS/CSO Porter Brook 22 69 h 21m -
Yorkshire Water SLAYLEIGH LANE/CSO Porter Brook 26 58 h 48m -
Yorkshire Water ROCHESTER ROAD/CSO Black Brook 6 40 h 9m -
Yorkshire Water ENDCLIFFE PARK/CSO Porter Brook 15 39 h 45m -
Yorkshire Water RIVERDALE ROAD/NO 2 CSO Oak Brook 7 6 h 44m -
Yorkshire Water STUMPERLOWE CRES ROAD/CSO Porter Brook 2 0 h 42m 271 h
Yorkshire Water BELGRAVE ROAD WEST/CSO Porter Brook 0 0 h 5,897 h
Yorkshire Water SNAITHING PARK ROAD/CSO Porter Brook 0 0 h -
Yorkshire Water SNAITHING LANE/CSO Porter Brook 0 0 h -
Yorkshire Water Unknown Unknown 0 0 h 472 h

Data Sources & Accuracy

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.