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Ossett and Denby Dale

Polluted by sewage 1,313 times in 2025 lasting 8,354 hours

Monitoring fell below 50% in some locations so could be more

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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 Ossett and Denby Dale in 2026

So far this year (as of 18 May 2026, 12:00) there has been 5,549 hours of sewage overflows, from 55 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for Ossett and Denby Dale in 2025

42 Sites polluted by Yorkshire Water
1,313 sewage dumps
8,354 hours duration
That's 11.6 months. On average 3.6 times a day

Change Over Time

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Constituencies near Ossett and Denby Dale

Waterways in Ossett and Denby Dale

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Ossett and Denby Dale 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 2 of the total 50 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway locations had reporting enabled for less than half the year.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Yorkshire Water River Calder HORBURY (DUDFLEET) STW 129 1,110 100
Yorkshire Water River Dearne CLAYTON WEST WWTW 75 1,074 100
Yorkshire Water Bretton Brook WEST BRETTON STW 77 903 100
Yorkshire Water Dean Bottom Dike SPRINGFIELD LANE CSO 67 595 91.3
Yorkshire Water Smithy Brook BRIDGE ROAD CSO 101 524 100
Yorkshire Water River Calder MITCHELL LAITHES WWTW 61 523 100
Yorkshire Water River Calder ALBION MILLS CSO 52 376 100
Yorkshire Water Dennington Beck GREAT CLIFF PS & STORM TANK 39 364 99.5
Yorkshire Water River Dearne CUCKSTOOL BOTTOM CSO 57 325 100
Yorkshire Water River Dearne BIRDS EDGE CSO 40 268 98.8
Yorkshire Water River Calder HORBURY BRIDGE SPS 63 245 100
Yorkshire Water River Calder OSSETT SPA SPS AND STORM TANKS 32 244 99.4
Yorkshire Water River Dearne PARK MILL CSO 43 211 100
Yorkshire Water Park Gate Dike SKELMANTHORPE CSO 27 180 100
Yorkshire Water River Calder HEALEY ROAD OSSETT CSO 58 152 98.1
Yorkshire Water Pugney'S Drain PORTOBELLO SPS 27 133 100
Yorkshire Water Little Dike BROOMHILL EMLEY CSO 25 129 95.5
Yorkshire Water Owler Beck STANDBRIDGE LANE CSO 41 113 100
Yorkshire Water Out Lane Dyke BROOMFIELD LANE NO 2 CSO 20 106 100
Yorkshire Water Totty Beck WOOLLEY STW 58 105 99.95
Yorkshire Water Oakenshaw Beck MONTAGUE STREET CSO 19 103 100
Yorkshire Water Spring Mill Beck BAPTISTS LANE CSO 34 97 87.8
Yorkshire Water Pildacre Mill Beck PILDACRE LANE CSO 28 94 100
Yorkshire Water Range Dike SPRINGFIELD LANE CSO 7 81 100
Yorkshire Water Old Mill Stream CHARLES STREET NO 2 CSO 19 63 100
Yorkshire Water Pits Beck Culverted NETHERTON CSO 33 42 100
Yorkshire Water Shepley Dike DAMHILL NO 2 CSO 9 34 86.1
Yorkshire Water Smithy Brook EAST COWICK SEWAGE PUMPING STATION 3 33 26.6
Yorkshire Water Shepley Dike THUNDERBRIDGE NO 2 CSO 8 25 99.6
Yorkshire Water Oakenshaw Beck AGBRIGG GARAGE CSO 9 23 100
Yorkshire Water River Dearne HAIGH STW 3 23 100
Yorkshire Water Owler Beck Via Surface Wtr Sw PLEDWICK CSO 12 9 100
Yorkshire Water River Calder SWALLOWS NEST CSO 1 8 46
Yorkshire Water River Dearne CATCH BAR CSO 4 7 97.5
Yorkshire Water Thorpe Dike LANE HACKINGS GREEN CSO 6 7 76.8
Yorkshire Water Spring Mill Beck OSSETT TOWNGATE NO 2 CSO 11 6 100
Yorkshire Water Clvrt Springfield Beck OSSETT WAKEFIELD ROAD 2 CSO 7 3 100
Yorkshire Water Bushy Beck GAWTHORPE MAIN STREET CSO 3 1 100
Yorkshire Water Owler Beck/Newmillerdam NEWMILLERDAM CSO 2 0 100
Yorkshire Water River Calder DENBY DALE ROAD CSO 1 0 100
Yorkshire Water Bretton Brook INNFOLD FARM 3 NO 2 CSO 1 0 100
Yorkshire Water River Dearne SPRING GROVE CSO 1 0 100
Yorkshire Water Oakenshaw Beck AGBRIGG GARAGE SPS 0 0 100
Yorkshire Water Clvrt Toad Hole Dike BACK LANE CSO 0 0 100
Yorkshire Water Chapelthorpe Bank Owler B CHAPELTHORPE CSO 0 0 100
Yorkshire Water Woodsome Beck DOGLEY CSO 0 0 99.8
Yorkshire Water Bretton Brook TOWN FARM 2 CSO 0 0 99.9
Yorkshire Water River Dearne TOWN FARM 4 CSO 0 0 93.2
Yorkshire Water Bretton Brook TOWN FARM 4 SSO 0 0 100
Yorkshire Water River Dearne WAKEFIELD ROAD SCISSET CSO 0 0 95.7

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.

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Analysing sewage pollution by the Water Industry

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