It's a Dirty Business

Watch Channel 4's documentary about the state of the water industry, then sign the petition to bring water back to public ownership.

Calder Valley

Polluted by sewage 2,449 times in 2025 lasting 16,375 hours - That's 1.9 years!

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

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

Select Another Constituency

Select the constituency from the drop-down
✔ means we have live data (𝑥 if not)

Live data for Calder Valley in 2026

So far this year (as of 18 May 2026, 12:00) there has been 7,087 hours of sewage overflows, from 86 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s

Totals for Calder Valley in 2025

64 Sites polluted by Yorkshire Water
2,449 sewage dumps
16,375 hours duration
That's 1.9 years. On average 6.7 times a day

Change Over Time

Take Action

Your local MP is Josh Fenton-Glynn (Labour) - Find out more about their interests, donors, and voting at They Work For You

Share this page, post a message, and tell others about the huge problem of sewage pollution across the UK
Post
Post

Constituencies near Calder Valley

Waterways in Calder Valley

We need your support!

Please consider a one-off or small recurring donation. We need your help to keep this site going.

Donate Now

Pollution Summary 2025

Here are all the reported sewage overflow totals for Calder Valley 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 4 of the total 73 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 EASTWOOD WWTW 129 2,181 100
Yorkshire Water River Calder PRINCESS BRIDGE NO 2 CSO 128 1,649 100
Yorkshire Water River Calder CROW NEST BRIDGE CSO 91 1,532 98.6
Yorkshire Water River Ryburn RIPPONDEN WOOD STW 56 1,311 100
Yorkshire Water River Calder BONEGATE LN, ALEGER ST & THORNHILL 266 1,254 99.97
Yorkshire Water River Calder HIGH ROYD SEWAGE TREATMENT WORKS 206 1,195 99.77
Yorkshire Water Colden Water DELIGHT SPS 58 913 100
Yorkshire Water River Calder EASTWOOD NO2 CSO 96 806 100
Yorkshire Water Black Brook WEST VALE CSO 78 587 67.5
Yorkshire Water Canker Dyke WISTONS LANE/ELLAND LINK CSO 47 540 100
Yorkshire Water Barsey Clough BARSEY GREEN STW 44 475 99
Yorkshire Water River Calder BREARLEY MAIN SEWER CSO 79 470 99.9
Yorkshire Water Oak Hill Clough FIELDEN TERRACE CSO 91 391 100
Yorkshire Water Bottom Hall Beck WYKE BECK CSO 72 356 100
Yorkshire Water River Calder FIELDING STREET CSO 46 342 100
Yorkshire Water Wyke Beck BAILIFF BRIDGE CSO 113 315 96.73
Yorkshire Water Luddenden Brook NEW ROAD CSO 19 208 99.7
Yorkshire Water Canker Dyke HUDDERSFIELD ROAD CSO 77 179 99.8
Yorkshire Water River Calder WOODHOUSE LANE CSO 77 160 100
Yorkshire Water Cragg Brook CRAGG ROAD NO 2 CSO 40 139 100
Yorkshire Water Clifton Beck WYKE OLD LANE CSO 48 96 100
Yorkshire Water Canker Dyke HUDDERSFIELD ROAD/SOUTH LANE CSO 47 91 100
Yorkshire Water River Calder ELLAND LOWFIELDS SPS 40 90 100
Yorkshire Water River Calder HAZELWOOD STREET CSO 37 90 81.5
Yorkshire Water Hebden Water HEPTONSTALL ROAD CSO 30 84 100
Yorkshire Water River Calder POLLARD STREET NO 2 CSO 29 83 100
Yorkshire Water River Calder ASHENHURST ROAD 40 82 99.8
Yorkshire Water River Calder ELLEN HOUSE ROAD 7 72 100
Yorkshire Water River Calder BURNLEY ROAD CORNHOLME CSO 16 68 100
Yorkshire Water River Calder BRAMSTON STREET CSO 34 61 65.2
Yorkshire Water River Calder WEST VALE 21 58 99.95
Yorkshire Water Clifton Beck HOYLE HOUSE BRIDGE CSO 27 46 100
Yorkshire Water River Calder BRIDGE LANE/MARKET STREET 10 42 77.4
Yorkshire Water Black Brook HOYLES MEMORIAL GARDENS CSO 27 41 76.4
Yorkshire Water River Calder RIVER STREET CSO 19 35 33
Yorkshire Water Walsden Water LONGFIELD ROAD 20 30 100
Yorkshire Water River Calder LOWER EDGE ROAD CSO 11 27 100
Yorkshire Water Hebden Water OLD GATE CSO 12 27 93.4
Yorkshire Water River Calder MITCHELL STREET CSO 6 27 100
Yorkshire Water River Calder FERNHILL CSO 7 24 47.1
Yorkshire Water River Calder HANGINGROYD ROAD CSO 3 23 97.7
Yorkshire Water Canker Dyke EASTGATE, ELLAND CSO 27 22 100
Yorkshire Water River Calder BIRDS ROYD LANE CSO 27 21 99.4
Yorkshire Water River Calder REDACRE STW 7 18 99.9
Yorkshire Water Carver Clough CARVER CLOUGH NO 2 CSO 7 17 95
Yorkshire Water Holywell Brook FOREST HILL ROAD CSO 8 12 98.1
Yorkshire Water Holywell Brook STAINLAND ROAD CSO 5 11 100
Yorkshire Water Ibbot Royd Clough IBBOT ROYD CSO 2 9 100
Yorkshire Water Black Brook BROW BRIDGE CSO 8 7 100
Yorkshire Water River Calder DYEHOUSE LANE CSO 19 6 100
Yorkshire Water River Calder GAS WORKS LANE 1 6 93.9
Yorkshire Water River Calder ELLAND LANE CSO 2 5 100
Yorkshire Water River Calder PARK ROAD CSO 1 5 100
Yorkshire Water Hebden Water LOWER MILL CSO 2 3 100
Yorkshire Water Holywell Brook STAINLAND ROAD CSO 6 2 100
Yorkshire Water Black Brook SUNNYBANK CSO 6 2 100
Yorkshire Water Black Brook HOULTS LANE CSO 5 1 99.9
Yorkshire Water Culverted Holywell Brook HOLYWELL BROOK CSO 1 1 3.6
Yorkshire Water Hebden Water SALEM CRICKET GROUND CSO 1 1 59.4
Yorkshire Water Calder And S EAST COWICK SEWAGE PUMPING STATION 4 1 99.9
Yorkshire Water Culverted White Lee Clough MIDGELEY ROAD CSO 3 0 100
Yorkshire Water Black Brook SADDLEWORTH ROAD CSO 1 0 99.4
Yorkshire Water Black Brook ROCHDALE ROAD CSO 1 0 99.1
Yorkshire Water River Calder SCOUT ROAD CSO 1 0 100
Yorkshire Water Hebden Water BIRCHCLIFFE ROAD CSO 0 0 99.9
Yorkshire Water Walsden Water HALL STREET SSO 0 0 78.9
Yorkshire Water River Calder LILLANDS LANE CSO 0 0 100
Yorkshire Water River Calder LORDS LANE BRIGHOUSE CSO 0 0 100
Yorkshire Water River Calder MILLGATE SPS 0 0 100
Yorkshire Water River Ryburn OLD BRIDGE INN CSO 0 0 99.9
Yorkshire Water River Calder PARK ROAD SPS 0 0 100
Yorkshire Water Walsden Water SKEW BRIDGE CSO 0 0 10.1
Yorkshire Water River Calder THE DRIVE/CALDENE AVENUE 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. 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.

Top of the Poops

Analysing sewage pollution by the Water Industry

Follow on Instagram

Media Queries

Get in touch if you have queries or want to discuss our data.

press [at] top-of-the-poops.org

Please Support Us

We rely on donations to fund our work. Please support us if you can
Yes! Support TOTP!

© 2020-2025 Top-Of-The-Poops CC-BY-SA 4.0,
© Openstreetmap contributors, Contains OS data © Crown copyright and database right 2021-2025,
Contains Water UK National Storm Overflow Hub Data CC-BY-SA 4.0 and analysis © 2025 Top-Of-The-Poops

Some data reproduced under Open Government Licence

Please don't scrape these pages - we can maybe share our data with you

Full Copyright information available at: our GitHub page