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Sheffield Hallam

Polluted by sewage 806 times in 2025 lasting 1,336 hours

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

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Live data for Sheffield Hallam in 2026

So far this year (as of 18 May 2026, 12:00) there has been 1,174 hours of sewage overflows, from 18 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for Sheffield Hallam in 2025

11 Sites polluted by Yorkshire Water
806 sewage dumps
1,336 hours duration
That's 1.86 months. On average 2.2 times a day

Change Over Time

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Sheffield Hallam in 2025. Sometimes sewage can be being dumped for months at a time.

Reporting refers to how much of the time the monitoring was active. In this constituency all the declared CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s appeared to have monitoring enabled for more than 50% of the year

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Yorkshire Water River Sheaf MILLHOUSES PARK CSO 90 490 100
Yorkshire Water River Rivelin RIVELIN VALLEY 3 CSO 56 213 99.9
Yorkshire Water Porter Brook HANGINGWATER ROAD CSO 55 180 100
Yorkshire Water River Don LANGSETT ROAD CSO 36 137 100
Yorkshire Water River Rivelin GLEN BRIDGE COMBINED SEWER OVERFLOW 36 85 99.3
Yorkshire Water Porter Brook WHITELEY WOODS CSO 27 78 100
Yorkshire Water Porter Brook SLAYLEIGH LANE CSO 32 68 100
Yorkshire Water Porter Brook ENDCLIFFE PARK CSO 456 44 100
Yorkshire Water Porter Brook YORKSHIRE WATER SERVICES LTD, DETEN 4 27 93.5
Yorkshire Water Oak Brook RIVERDALE ROAD NO 2 CSO 10 9 100
Yorkshire Water Porter Brook STUMPERLOWE ROAD CSO 4 1 100
Yorkshire Water Porter Brook BELGRAVE ROAD WEST CSO 0 0 97.5
Yorkshire Water Porter Brook SNAITHING LANE CSO 0 0 100
Yorkshire Water Porter Brook SNAITHING PARK ROAD CSO 0 0 99.9

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.