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Ossett and Denby Dale - 2025 Sewage

Polluted by sewage 6,244 hours in 2025 , monitoring offline 40,907 hours , potential overflows 7,150 hours

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

Which Year?

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View Annual Sewage Data

You're looking at the totals that we have calculated for sewage in Ossett and Denby Dale 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 - 1,559 hours , 2,430 offline
Feb - 198 hours , 33 potential
Mar - 116 hours , 516 potential
Apr - 99 hours , 428 potential
May - 6 hours , 750 potential
Jun - 11 hours , 723 potential
Jul - 262 hours , 944 potential
Aug - 2 hours , 801 potential
Sept - 460 hours , 720 potential
Oct - 256 hours , 744 potential
Nov - 1,703 hours , 720 potential
Dec - 1,565 hours , 744 potential
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Totals so far

Company Site Name Receiving Waterway Overflow Days Total Duration (hours) Offline/Potential Pollution
Yorkshire Water CLAYTON WEST/STW River Dearne 69 707h 44m -
Yorkshire Water HORBURY/STW River Calder 64 610h 34m -
Yorkshire Water WEST BRETTON/NO 2 STW Bretton Brook 65 584h 27m -
Yorkshire Water BRIDGE ROAD/CSO Smithy Brook 73 363h 20m -
Yorkshire Water BIRDS EDGE/CSO River Dearne 43 331h 22m -
Yorkshire Water PORTOBELLO/CSO Pugney'S Drain 51 328h 21m -
Yorkshire Water ALBION MILLS/CSO River Calder 50 326h 5m -
Yorkshire Water CUCKSTOOL BOTTOM/CSO River Dearne 50 288h 20m -
Yorkshire Water SPRINGFIELD LANE/CSO Dean Bottom Dike 40 231h 54m -
Yorkshire Water DEWSBURY/STW/3XDWF OVERFLOW River Calder 38 228h 43m -
Yorkshire Water HORBURY BRIDGE/NO 2 CSO River Calder 55 207h 23m -
Yorkshire Water PARK MILL/CSO River Dearne 37 182h 28m -
Yorkshire Water SKELMANTHORPE/CSO Park Gate Dike 29 152h 29m -
Yorkshire Water HORBURY/STW/6XDWF OVERFLOW River Calder 45 150h 9m -
Yorkshire Water HORBURY ROAD M1/CSO Lupset Beck 12 147h 33m 687 h
Yorkshire Water HEALEY ROAD OSSETT/CSO River Calder 48 132h 14m -
Yorkshire Water BAPTIST LANE/CSO Spring Mill Beck 38 124h 23m 928 h
Yorkshire Water GREAT CLIFF/SPS Dennington Beck 26 114h 23m 155 h
Yorkshire Water STANDBRIDGE LANE/CSO Owler Beck 36 104h 23m -
Yorkshire Water BROOMHALL EMLEY/CSO Little Dike 24 103h 48m -
Yorkshire Water INNFOLD FARM 1/CSO River Dearne 6 95h 4m 61 h
Yorkshire Water BROOMFIELD LANE/NO 2 CSO Out Lane Dyke 15 89h 25m -
Yorkshire Water MONTAGUE STREET/CSO Oakenshaw Beck 17 82h 13m -
Yorkshire Water LUPSET/CSO Lupset Beck 19 75h 12m -
Yorkshire Water PILDACRE LANE/NO 2 CSO Pildacre Mill Beck 22 74h 58m -
Yorkshire Water DEWSBURY/STW/6XDWF OVERFLOW River Calder 15 71h 16m -
Yorkshire Water WOOLLEY VILLAGE/STW/3XDWF OVERFLOW Totty Beck 31 58h 8m -
Yorkshire Water MANOR ROAD/CSO Range Dike 5 57h 2m -
Yorkshire Water CHARLES STREET/NO 2 CSO Old Mill Stream 17 52h -
Yorkshire Water NETHERTON/CSO Pits Beck Culverted 29 34h 22m -
Yorkshire Water DAMHILL/NO 2 CSO Shepley Dike 10 31h 5m -
Yorkshire Water HAIGH/STW River Dearne 2 19h 21m -
Yorkshire Water LOCK STREET/CSO River Calder 2 18h 26m 8,158 h
Yorkshire Water THUNDERBRIDGE/NO 2 CSO Shepley Dike 6 16h 23m 66 h
Yorkshire Water AGBRIGG GARAGE/CSO Oakenshaw Beck 6 8h 45m -
Yorkshire Water SWALLOWS NEST/CSO River Calder 1 8h 22m 4,258 h
Yorkshire Water LOW COMMON/CSO Varies With Outlet 5 8h 4m -
Yorkshire Water PLEDWICK/CSO Owler Beck Via Surface Wtr Sw 7 6h 5m -
Yorkshire Water OSSETT TOWNGATE/NO 2 CSO Spring Mill Beck 6 4h 38m -
Yorkshire Water CATCH BAR/CSO River Dearne 5 4h 16m 488 h
Yorkshire Water LANE HACKINGS GREEN/CSO Thorpe Dike 2 3h 11m 6,153 h
Yorkshire Water WOOLLEY VILLAGE/STW/6XDWF OVERFLOW Totty Beck 2 2h 21m -
Yorkshire Water OSSETT WAKEFIELD RD/2 CSO Clvrt Springfield Beck 4 1h 50m -
Yorkshire Water DENBY DALE ROAD/CSO River Calder 1 0h 22m -
Yorkshire Water GAWTHORPE MAIN ST/CSO Bushy Beck 2 0h 14m -
Yorkshire Water NEWMILLERDAM/CSO Owler Beck/Newmillerdam 1 0h 14m 1,475 h
Yorkshire Water SPRING GROVE/CSO River Dearne 1 0h 14m -
Yorkshire Water INNFOLD FARM 3/NO 2 CSO Bretton Brook 1 0h 14m -
Yorkshire Water WAKEFIELD RD SCISSET/CSO River Dearne 1 0h 5m 8,551 h
Yorkshire Water THORNHILL ROAD/CSO Smithy Brook 0 0h 8,440 h
Yorkshire Water XXXFOLD FARM 4/CSO Bretton Brook 0 0h -
Yorkshire Water DOGLEY/CSO Woodsome Beck 0 0h 8,632 h
Yorkshire Water BACK LANE/CSO Clvrt Toad Hole Dike 0 0h -
Yorkshire Water XXXFOLD FARM 2/CSO Bretton Brook 0 0h -
Yorkshire Water CHAPELTHORPE/CSO Chapelthorpe Bank Owler B 0 0h -

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.