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Thirsk and Malton

Polluted by sewage 2,600 times in 2025 lasting 17,923 hours - That's 2.07 years!

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 Thirsk and Malton in 2026

So far this year (as of 5 Sept 2026, 03:30) there has been 12,464 hours of sewage overflows, from 127 CSO Combined Sewage Overflow - a device that, when operating, pours combined rainwater & sewage into a waterway s - that's 1.44 years!

Totals for Thirsk and Malton in 2025

96 Sites polluted by Yorkshire Water
2,600 sewage dumps
17,923 hours duration
That's 2.07 years. On average 7.1 times a day

Change Over Time

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Constituencies near Thirsk and Malton

Waterways in Thirsk and Malton

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Pollution Summary 2025

Here are all the reported sewage overflow totals for Thirsk and Malton 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 1 of the total 109 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 Harome Moor Drain HAROME SEWAGE TREATMENT WORKS 113 1,918 100
Yorkshire Water Cobshaw Dyke LANGTHORNE STW 101 1,693 100
Yorkshire Water Whitelass Beck FELIXKIRK SEWAGE TREATMENT WORKS 114 1,401 100
Yorkshire Water Culverted Mill Beck MALTON NORTON SPS 90 1,040 99.8
Yorkshire Water Costa Beck KIRBY MISPERTON STW 56 842 100
Yorkshire Water Black Dike WEST LILLING SPS 66 824 100
Yorkshire Water Holbeck AMPLEFORTH VILLAGE WPC WORKS STORM 48 711 99
Yorkshire Water Howl Beck SHERIFF HUTTON STW 81 632 100
Yorkshire Water Seven GREAT BARUGH SEWAGE TREATMENT WORKS 41 463 99.4
Yorkshire Water Little Beck COWESBY SEWAGE TREATMENT WORKS 39 446 98.8
Yorkshire Water River Derwent MALTON SEWAGE TREATMENT WORKS 35 419 100
Yorkshire Water Acklam Beck ACKLAM SEWAGE TREATMENT WORKS 38 416 100
Yorkshire Water River Derwent CASTLEGATE SEWAGE PUMPING STATION 20 402 100
Yorkshire Water River Derwent HOWSHAM SEWAGE TREATMENT WORKS 31 372 100
Yorkshire Water Bedale Beck BEDALE SEWAGE TREATMENT WORKS 61 351 100
Yorkshire Water Goit Via A Culvertedsystem SOUTH FARM SEWAGE PUMPING STATION 42 338 98.3
Yorkshire Water Terry Gutter NORTHALLERTON ROAD CSO 36 296 95
Yorkshire Water Spital Beck FOSTON STW FINAL EFFLUENT 36 274 100
Yorkshire Water River Dove KIRKBY MOORSIDE NO.2 CSO 84 267 100
Yorkshire Water Sike FLAXTON SEWAGE TREATMENT WORKS 57 263 100
Yorkshire Water Mill Hills Beck CONEYSTHORPE SEWAGE TREATMENT WORKS 15 236 100
Yorkshire Water River Derwent CHANDLERS WHARF SPS 23 223 100
Yorkshire Water River Rye HELMSLEY SEWAGE TREATMENT WORKS 50 209 100
Yorkshire Water Cod Beck THIRSK SEWAGE TREATMENT WORKS 40 195 100
Yorkshire Water Main Drain River Hertford STONEGATE CSO 65 193 100
Yorkshire Water Hertford MUSTON SEWAGE PUMPING STATION 25 188 83
Yorkshire Water Main Cut SNAPE SEWAGE TREATMENT WORKS 36 184 100
Yorkshire Water Levisham Beck LOCKTON SEWAGE TREATMENT WORKS 80 172 100
Yorkshire Water Wakendale Beck OLDSTEAD SEWAGE TREATMENT WORKS 24 165 99.8
Yorkshire Water Cod Beck ST JAMES GREEN SPS 45 164 100
Yorkshire Water North Sea FILEY WASTE WATER TREATMENT WORKS 60 159 100
Yorkshire Water River Hertford HUNMANBY SEWAGE TREATMENT WORKS - T 23 155 100
Yorkshire Water Culverted Birdforth Beck LOW LANE SEWAGE PUMPING STATION 26 137 100
Yorkshire Water Holme And Ainderby Beck SINDERBY STW 16 131 100
Yorkshire Water Costa Beck PICKERING SEWAGE TREATMENT WORKS 42 120 100
Yorkshire Water River Derwent NORTON CHURCH STREET CSO 54 113 100
Yorkshire Water Bowbridge Beck HACKFORTH SEWAGE TREATMENT WORKS 31 108 100
Yorkshire Water River Severn SINNINGTON SPS 18 104 100
Yorkshire Water River Derwent SHEEPFOOT HILL CSO 6 91 100
Yorkshire Water Holbeck WASS SEWAGE TREATMENT WORKS 24 91 100
Yorkshire Water Unnamed Grass Keld COLD KIRBY NO2 STW 14 90 3.6
Yorkshire Water Thornton Beck THORNTON LE DALE STW 11 78 100
Yorkshire Water North Sea Via Reighton Gill HUNMANBY GAP SPS 27 76 100
Yorkshire Water Costa Beck LITTLE BARUGH SEWAGE TREATMENT WORK 18 76 100
Yorkshire Water Allerston Beck ALLERSTON SEWAGE PUMPING STATION 5 74 100
Yorkshire Water Burrill Beck BURRILL SEWAGE TREATMENT WORKS 37 65 100
Yorkshire Water River Derwent CRAMBE SEWAGE TREATMENT WORKS 11 63 100
Yorkshire Water Cod Beck BLAKEY LANE NO 2 CSO 35 62 93.3
Yorkshire Water Bedale Beck GREAT CRAKEHALL SPS 17 61 99.8
Yorkshire Water North Sea FLAT CLIFFS SEWAGE PUMPING STATION 10 58 100
Yorkshire Water River Derwent WHEELGATE CSO 46 56 100
Yorkshire Water Rillington Beck RILLINGTON WPC WORKS STORM TANKS 27 54 100
Yorkshire Water River Dove KIRKBYMOORSIDE STW 9 52 90.8
Yorkshire Water Ditch FOLKTON SEWAGE PUMPING STATION 22 40 100
Yorkshire Water Outgang Drain OUTGANG ROAD SPS 27 40 99.8
Yorkshire Water River Derwent LASCELLES LANE SPS 31 38 100
Yorkshire Water River Rye SAWMILL LANE CSO 25 37 100
Yorkshire Water Derwent RECTORY FARM SEWAGE PUMPING STATION 5 34 78.1
Yorkshire Water Sherburn Beck SHERBURN WPC WORKS 14 27 100
Yorkshire Water River Seven MARTON SEWAGE TREATMENT WORKS 2 26 100
Yorkshire Water Ebberston Beck EBBERSTON SPS 21 25 100
Yorkshire Water River Derwent MALTON HOLMESFIELD SPS 88 22 100
Yorkshire Water River Seven NORMANBY SEWAGE PUMPING STATION 2 21 100
Yorkshire Water Ditch STAXTON VILLAGE SPS 18 21 99.8
Yorkshire Water Healam Beck KIRKLINGTON WASTEWATER T-MENT WORKS 7 19 100
Yorkshire Water River Swale SKIPTON ON SWALE STW 10 18 99.5
Yorkshire Water Thornton Le Beans Beck THORNTON-LE-BEANS CSO 7 18 100
Yorkshire Water Bedale Beck LEEMING BAR CSO 8 15 90.3
Yorkshire Water Holbeck RYEDALE CARR LANE CSO 12 13 100
Yorkshire Water Holbeck AMPLEFORTH CSO 13 12 100
Yorkshire Water Marrs Beck HOVINGHAM SEWAGE TREATMENT WORKS 3 10 100
Yorkshire Water Bedale Beck BEDALE WPC WORKS STORM TANKS 15 9 99.7
Yorkshire Water Bulmer Beck CHURCH END SPS 5 9 99.9
Yorkshire Water River Rye SWINTON PUMPING STATION 2 8 100
Yorkshire Water Syke Cut Via A Public Sewer GALE LANE CSO 13 8 77.6
Yorkshire Water Pickhill Beck THE GREEN SSO 3 6 100
Yorkshire Water Spittal Beck FOSTON SEWAGE PUMPING STATION 8 6 100
Yorkshire Water Cod Beck THIRSK FINKLE STREET NO. 2 CSO 7 5 99.8
Yorkshire Water Costa Beck AISLABY SEWAGE PUMPING STATION 1 4 100
Yorkshire Water Wath Beck RYEDALE NEW ROAD CSO 9 4 100
Yorkshire Water Wath Beck RAILWAY STREET SPS 2 4 100
Yorkshire Water Mill Beck ST PETERS STREET CSO 14 4 100
Yorkshire Water River Seven MARTON BRIDGE SEWAGE PUMPING STATIO 1 3 94.1
Yorkshire Water Cod Beck CHAPEL STREET CSO 3 2 100
Yorkshire Water East Beck SHERBURN SSO 6 2 100
Yorkshire Water River Wiske OTTERINGTON ROAD SSO 3 2 78
Yorkshire Water Outgang Drain EASTGATE CSO 7 2 99.6
Yorkshire Water Old Beck NETHER SILTON CSO 7 2 100
Yorkshire Water River Riccall MALTON HAROME SPS 5 1 100
Yorkshire Water River Derwent HAWKSWELL LANE CSO 5 1 100
Yorkshire Water Mill Beck WELHAM ROAD SOUTH CSO 2 0 100
Yorkshire Water Thornton Beck STONE BRIDGE NO 2 CSO 2 0 100
Yorkshire Water Priorpot Beck REETON TERRACE NO 2 CSO 2 0 100
Yorkshire Water Acklam Beck ACKLAM SEWAGE PUMPING STATION 1 0 99.9
Yorkshire Water River Dove SPORTSFIELD NO2 CSO 1 0 100
Yorkshire Water River Derwent OLD MALTONGATE CSO 2 0 100
Yorkshire Water Priorpot Beck BALACLAVA NO. 2 SPS 0 0 100
Yorkshire Water Bedale Bk/Swale BEDALE WPC WORKS STORM TANKS 0 0 99.7
Yorkshire Water Pickering Beck CSO & PUMPING STATION 0 0 100
Yorkshire Water Thornton Beck CUDDY BROWN CLOSE CSO 0 0 100
Yorkshire Water Derwent FIRBY SEWAGE TREATMENT WORKS 0 0 100
Yorkshire Water Habton Ings Drain KIRBY MISPERTON LANE SSO 0 0 98.9
Yorkshire Water River Dove KIRKBY MILLS SEWAGE PUMPING STATION 0 0 100
Yorkshire Water River Hertford OUTGAITS LANE CSO 0 0 100
Yorkshire Water Priorpot Beck PRIORPOT BRIDGE CSO 0 0 100
Yorkshire Water Priorpot Beck REETON TERRACE NO 1 CSO 0 0 100
Yorkshire Water River Derwent THE BROWS CSO 0 0 100
Yorkshire Water River Derwent TOWN STREET MALTON CSO 0 0 97.3
Yorkshire Water River Derwent YORKERSGATE COMBINED SEWER OVERFLOW 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

Annual figures up to and including 2025 come from official water company returns. The 2026 figure is our own estimate, derived continuously from the companies' live data feeds.

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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