Calder Valley was polluted by sewage 3,731 times in 2023
lasting 26,573 hours - that's 3.08 years!
- but monitoring was disabled in some locations, so could be more

© OpenStreetMap contributors
Contains OS Data © Crown copyright & database right 2021-2023
© Top of the Poops 2021-2023
✔ means we have experimental daily data since 2023
Totals for Calder Valley in 2023
60 Sites polluted by Yorkshire Water
3,731 sewage dumps
26,573 h duration
That's 3.08 years! On average 10.2 times a day
Change Over Time
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Pollution Summary 2023

Here are all the reported sewage overflow totals for Calder Valley in 2023. 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 77 CSO locations had reporting enabled for less than half the year, of which 2 had zero reporting.

Company Waterway Site Sewage Dumps Duration (Hours) Reporting %
Yorkshire Water River Calder HIGH ROYD SEWAGE TREATMENT WORKS 282 3,930 100
Yorkshire Water River Calder BONEGATE LN, ALEGER ST & THORNHILL 469 3,561 88.37
Yorkshire Water River Ryburn RIPPONDEN WOOD STW 282 2,692 100
Yorkshire Water River Calder EASTWOOD WWTW 174 2,471 99.6
Yorkshire Water Black Brook WEST VALE CSO 183 2,421 94.4
Yorkshire Water River Calder PRINCESS BRIDGE NO 2 CSO 138 1,858 87.2
Yorkshire Water River Calder BREARLEY MAIN SEWER CSO 121 1,419 97.6
Yorkshire Water River Calder EASTWOOD NO2 CSO 77 794 68.1
Yorkshire Water Bottom Hall Beck WYKE BECK CSO 114 784 99.7
Yorkshire Water River Calder ELLEN HOUSE ROAD 56 776 100
Yorkshire Water Hebden Water SALEM CRICKET GROUND CSO 95 757 73.2
Yorkshire Water Clifton Beck WYKE OLD LANE CSO 114 707 100
Yorkshire Water Wyke Beck BAILIFF BRIDGE CSO 201 612 76.37
Yorkshire Water Cragg Brook CRAGG ROAD NO 2 CSO 66 540 95
Yorkshire Water Luddenden Brook NEW ROAD CSO 44 343 65.9
Yorkshire Water Barsey Clough BARSEY GREEN STW 32 270 99.9
Yorkshire Water River Calder FIELDING STREET CSO 46 254 95.6
Yorkshire Water Canker Dyke HUDDERSFIELD ROAD CSO 89 242 78.2
Yorkshire Water Canker Dyke WISTONS LANE/ELLAND LINK CSO 51 242 100
Yorkshire Water Colden Water DELIGHT SPS 19 200 100
Yorkshire Water River Calder ELLAND LOWFIELDS SPS 80 189 100
Yorkshire Water River Calder BURNLEY ROAD CORNHOLME CSO 51 181 97.1
Yorkshire Water River Calder HAZELWOOD STREET CSO 69 156 99.8
Yorkshire Water Hebden Water HEPTONSTALL ROAD CSO 54 104 83.1
Yorkshire Water River Calder POLLARD STREET NO 2 CSO 45 99 97.7
Yorkshire Water Hebden Water OLD GATE CSO 40 89 100
Yorkshire Water River Calder BRAMSTON STREET CSO 63 88 100
Yorkshire Water River Calder ASHENHURST ROAD 65 85 97.8
Yorkshire Water River Calder BIRDS ROYD LANE CSO 73 70 100
Yorkshire Water River Calder BRIDGE LANE/MARKET STREET 13 56 66
Yorkshire Water Clifton Beck HOYLE HOUSE BRIDGE CSO 44 55 97
Yorkshire Water Black Brook SADDLEWORTH ROAD CSO 35 54 83.9
Yorkshire Water Black Brook HOYLES MEMORIAL GARDENS CSO 41 48 94
Yorkshire Water Holywell Brook FOREST HILL ROAD CSO 34 47 99.9
Yorkshire Water River Calder LOWER EDGE ROAD CSO 31 45 94.1
Yorkshire Water Canker Dyke HUDDERSFIELD ROAD/SOUTH LANE CSO 36 43 74.6
Yorkshire Water Canker Dyke EASTGATE, ELLAND CSO 38 38 100
Yorkshire Water Nether Ends Beck STANSFIELD MILL CSO 18 38 93.2
Yorkshire Water River Ryburn LUMB CLOUGH CSO 12 31 81.4
Yorkshire Water River Calder WEST VALE 35 29 53.6
Yorkshire Water Holywell Brook STAINLAND ROAD CSO 24 29 98.6
Yorkshire Water River Calder RIVER STREET CSO 11 20 25.7
Yorkshire Water Black Brook BROW BRIDGE CSO 28 16 82.1
Yorkshire Water Oak Hill Clough FIELDEN TERRACE CSO 27 16 99.4
Yorkshire Water River Calder WOODHOUSE LANE CSO 21 11 100
Yorkshire Water Ibbot Royd Clough IBBOT ROYD CSO 7 11 99.9
Yorkshire Water Black Brook HOULTS LANE CSO 17 5 97.8
Yorkshire Water River Calder MITCHELL STREET CSO 2 5 46.1
Yorkshire Water River Calder ELLAND LANE CSO 2 5 100
Yorkshire Water Walsden Water LONGFIELD ROAD 11 4 95.9
Yorkshire Water Culverted Holywell Brook HOLYWELL BROOK CSO 3 4 89.7
Yorkshire Water River Calder HANGINGROYD ROAD CSO 9 2 95
Yorkshire Water Black Brook SUNNYBANK CSO 9 1 100
Yorkshire Water River Calder DYEHOUSE LANE CSO 14 1 100
Yorkshire Water River Calder PARK ROAD CSO 1 1 95.4
Yorkshire Water Holywell Brook STAINLAND ROAD CSO 8 1 99.2
Yorkshire Water Black Brook ROCHDALE ROAD CSO 4 0 80.2
Yorkshire Water Culverted White Lee Clough MIDGELEY ROAD CSO 1 0 80.2
Yorkshire Water Hebden Water BIRCHCLIFFE ROAD CSO 1 0 76.7
Yorkshire Water Carver Clough CARVER CLOUGH NO 2 CSO 1 0 100
Yorkshire Water River Calder PARK ROAD SPS 0 0 100
Yorkshire Water River Calder FERNHILL CSO 0 0 0
Yorkshire Water River Calder LILLANDS LANE CSO 0 0 100
Yorkshire Water River Calder SCOUT ROAD CSO 0 0 99.7
Yorkshire Water River Calder REDACRE STW 0 0 100
Yorkshire Water River Calder LORDS LANE BRIGHOUSE CSO 0 0 74.1
Yorkshire Water River Calder CROW NEST BRIDGE CSO 0 0 99.7
Yorkshire Water River Ryburn WATSON MILL LANE CSO 0 0 0
Yorkshire Water River Calder THE DRIVE/CALDENE AVENUE CSO 0 0 98.5
Yorkshire Water Calder And S EAST COWICK SEWAGE PUMPING STATION 0 0 100
Yorkshire Water River Calder MILLGATE SPS 0 0 100
Yorkshire Water River Ryburn OLD BRIDGE INN CSO 0 0 100
Yorkshire Water Hebden Water LOWER MILL CSO 0 0 100
Yorkshire Water River Calder GAS WORKS LANE 0 0 100
Yorkshire Water River Calder LONGBOTTOM BRIDGE CSO 0 0 99.1
Yorkshire Water Walsden Water HALL STREET SSO 0 0 90.5
Yorkshire Water Walsden Water SKEW BRIDGE CSO 0 0 100

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. This 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.