Thirsk and Malton was polluted by sewage 4,962 times in 2023
lasting 33,556 hours - that's 3.88 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 Thirsk and Malton in 2023
108 Sites polluted by Yorkshire Water
4,962 sewage dumps
33,556 h duration
That's 3.88 years! On average 13.6 times a day
Change Over Time
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Constituencies near Thirsk and Malton
Waterways in Thirsk and Malton

Pollution Summary 2023

Here are all the reported sewage overflow totals for Thirsk and Malton 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 122 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 Costa Beck KIRBY MISPERTON STW 178 2,556 100
Yorkshire Water Holbeck AMPLEFORTH VILLAGE WPC WORKS STORM 176 2,427 100
Yorkshire Water Harome Moor Drain HAROME SEWAGE TREATMENT WORKS 149 2,369 100
Yorkshire Water Black Dike WEST LILLING SPS 138 2,195 100
Yorkshire Water Thornton Beck THORNTON LE DALE STW 86 1,458 100
Yorkshire Water River Swale MYTON ON SWALE SEWAGE WORKS 95 1,452 99.7
Yorkshire Water River Ure ALDWARK MOOR SEWAGE TREATMENT WORKS 186 1,360 99.2
Yorkshire Water River Rye HELMSLEY SEWAGE TREATMENT WORKS 82 1,127 100
Yorkshire Water Howl Beck SHERIFF HUTTON STW 105 954 99.7
Yorkshire Water River Derwent CASTLEGATE SEWAGE PUMPING STATION 49 950 100
Yorkshire Water Sidings Drain TOLLERTON SEWAGE TREATMENT WORKS 71 924 99.3
Yorkshire Water Costa Beck PICKERING SEWAGE TREATMENT WORKS 166 895 100
Yorkshire Water Holbeck GILLING EAST WPC WORKS STORM TANKS 76 877 100
Yorkshire Water Culverted Mill Beck MALTON NORTON SPS 95 690 97.8
Yorkshire Water Little Beck COWESBY SEWAGE TREATMENT WORKS 53 683 99
Yorkshire Water River Dove KIRKBY MOORSIDE NO.2 CSO 112 542 100
Yorkshire Water Culverted Birdforth Beck LOW LANE SEWAGE PUMPING STATION 50 541 100
Yorkshire Water New Parks Beck SUTTON-ON-THE-FOREST STW 31 521 99.4
Yorkshire Water Hurns Gutter SHIPTON STW 104 501 99.95
Yorkshire Water River Derwent YORKERSGATE COMBINED SEWER OVERFLOW 70 467 84.6
Yorkshire Water River Kyle FLAWITH SEWAGE TREATMENT WORKS 125 414 99.9
Yorkshire Water Cod Beck THIRSK SEWAGE TREATMENT WORKS 65 410 99.9
Yorkshire Water River Seven MARTON SEWAGE TREATMENT WORKS 48 405 99.9
Yorkshire Water River Kyle CHESHIRE HOMES 81 404 100
Yorkshire Water Sike FLAXTON SEWAGE TREATMENT WORKS 87 390 100
Yorkshire Water Seven GREAT BARUGH SEWAGE TREATMENT WORKS 42 386 91.8
Yorkshire Water Goit Via A Culvertedsystem SOUTH FARM SEWAGE PUMPING STATION 45 383 99.6
Yorkshire Water River Dove KIRKBYMOORSIDE STW 60 309 81.8
Yorkshire Water Costa Beck LITTLE BARUGH SEWAGE TREATMENT WORK 48 307 99.9
Yorkshire Water Culverted Swale HELPERBY SEWAGE TREATMENT WORKS 24 292 100
Yorkshire Water Derrings Beck THOLTHORPE STW (CONSENT REVIEWED) 79 292 99.9
Yorkshire Water Mill Hills Beck CONEYSTHORPE SEWAGE TREATMENT WORKS 30 289 99.9
Yorkshire Water Ebberston Beck EBBERSTON SPS 129 288 100
Yorkshire Water Derwent RECTORY FARM SEWAGE PUMPING STATION 14 287 3.3
Yorkshire Water Acklam Beck ACKLAM SEWAGE TREATMENT WORKS 28 255 99.8
Yorkshire Water River Derwent SHEEPFOOT HILL CSO 22 241 100
Yorkshire Water River Derwent CHANDLERS WHARF SPS 32 230 99.9
Yorkshire Water Elphin Beck HUSTHWAITE STW 76 229 100
Yorkshire Water Holbeck WASS SEWAGE TREATMENT WORKS 51 221 99.9
Yorkshire Water Levisham Beck LOCKTON SEWAGE TREATMENT WORKS 92 219 99.9
Yorkshire Water River Kyle STILLINGTON ROAD SSO 26 216 99.9
Yorkshire Water River Derwent MALTON SEWAGE TREATMENT WORKS 28 215 100
Yorkshire Water Main Drain River Hertford STONEGATE CSO 76 215 100
Yorkshire Water Shires Beck EASINGWOLD SEWAGE TREATMENT WORKS 38 208 99.6
Yorkshire Water North Sea FILEY WASTE WATER TREATMENT WORKS 97 207 100
Yorkshire Water River Derwent NORTON CHURCH STREET CSO 63 204 100
Yorkshire Water Cod Beck ST JAMES GREEN SPS 62 202 100
Yorkshire Water River Severn SINNINGTON SPS 28 196 99.3
Yorkshire Water River Hertford HUNMANBY SEWAGE TREATMENT WORKS - T 33 175 99.9
Yorkshire Water River Kyle OULSTON SEWAGE TREATMENT WORKS 69 150 97.2
Yorkshire Water River Dove SPORTSFIELD NO2 CSO 69 141 99.5
Yorkshire Water Birdforth Beck THORMANBY SEWAGE TREATMENT WORKS 71 114 99.9
Yorkshire Water Whitelass Beck FELIXKIRK SEWAGE TREATMENT WORKS 36 104 99.6
Yorkshire Water River Rye SWINTON PUMPING STATION 20 88 100
Yorkshire Water River Derwent HOWSHAM SEWAGE TREATMENT WORKS 24 80 99.8
Yorkshire Water North Sea FLAT CLIFFS SEWAGE PUMPING STATION 18 79 99.1
Yorkshire Water Outgang Drain OUTGANG ROAD SPS 61 74 100
Yorkshire Water River Derwent WHEELGATE CSO 71 73 100
Yorkshire Water Ditch STAXTON VILLAGE SPS 37 72 99.3
Yorkshire Water Leasmires Drain PROVIDENCE NOOK YORK ROAD 36 71 91.9
Yorkshire Water River Derwent CRAMBE SEWAGE TREATMENT WORKS 15 62 99.8
Yorkshire Water Hertford MUSTON SEWAGE PUMPING STATION 9 61 6.7
Yorkshire Water Howe Beck OTTERINGTON SEWAGE PUMPING STATION 7 51 100
Yorkshire Water Culverted River Kyle TOLLERTON GARAGE CSO 39 45 88.8
Yorkshire Water River Derwent LASCELLES LANE SPS 33 44 100
Yorkshire Water River Swale HELPERBY (BRAFFERTON) SPS 37 44 100
Yorkshire Water Ditch FOLKTON SEWAGE PUMPING STATION 22 40 100
Yorkshire Water Sherburn Beck SHERBURN WPC WORKS 7 40 99.9
Yorkshire Water River Swale SKIPTON ON SWALE STW 13 38 52
Yorkshire Water Wath Beck RYEDALE NEW ROAD CSO 37 38 86.6
Yorkshire Water River Rye SAWMILL LANE CSO 41 36 83.8
Yorkshire Water Kyle RASKELF STW 11 34 99.7
Yorkshire Water Rillington Beck RILLINGTON WPC WORKS STORM TANKS 25 31 100
Yorkshire Water Cod Beck BLAKEY LANE NO 2 CSO 28 31 100
Yorkshire Water Sidings Drain TOLLERTON BRIDGE CSO 11 27 73
Yorkshire Water Bulmer Beck CHURCH END SPS 10 26 99.9
Yorkshire Water River Derwent MALTON HOLMESFIELD SPS 115 25 100
Yorkshire Water Thornton Le Beans Beck THORNTON-LE-BEANS CSO 12 25 99.7
Yorkshire Water River Seven MARTON BRIDGE SEWAGE PUMPING STATIO 15 23 100
Yorkshire Water Spital Beck FOSTON STW FINAL EFFLUENT 12 19 100
Yorkshire Water Cod Beck THIRSK FINKLE STREET NO. 2 CSO 14 17 100
Yorkshire Water Marrs Beck HOVINGHAM SEWAGE TREATMENT WORKS 6 14 100
Yorkshire Water Outgang Drain EASTGATE CSO 21 13 100
Yorkshire Water Thornton Beck STONE BRIDGE NO 2 CSO 12 12 99.6
Yorkshire Water Spittal Beck FOSTON SEWAGE PUMPING STATION 7 11 100
Yorkshire Water Syke Cut Via A Public Sewer GALE LANE CSO 23 11 96.7
Yorkshire Water Wakendale Beck OLDSTEAD SEWAGE TREATMENT WORKS 7 9 99.9
Yorkshire Water Mill Beck ST PETERS STREET CSO 21 9 79.2
Yorkshire Water Green'S Beck COXWOLD SEWAGE TREATMENT PLANT 9 8 99.9
Yorkshire Water Derwent FIRBY SEWAGE TREATMENT WORKS 3 8 99.9
Yorkshire Water Holbeck AMPLEFORTH CSO 11 7 86.2
Yorkshire Water River Derwent TOWN STREET MALTON CSO 8 5 63.4
Yorkshire Water East Beck SHERBURN SSO 7 5 90.5
Yorkshire Water River Riccall MALTON HAROME SPS 2 3 99.8
Yorkshire Water Pickering Beck CSO & PUMPING STATION 49 2 100
Yorkshire Water Ings Beck WHENBY SEWAGE TREATMENT WORKS 7 2 98.3
Yorkshire Water River Ouse FISHER END SSO 6 2 99.6
Yorkshire Water River Hertford OUTGAITS LANE CSO 8 2 99.7
Yorkshire Water Mill Beck WELHAM ROAD SOUTH CSO 5 1 100
Yorkshire Water River Wiske OTTERINGTON ROAD SSO 2 1 82.3
Yorkshire Water Thornton Beck CUDDY BROWN CLOSE CSO 5 1 99.8
Yorkshire Water Allerston Beck ALLERSTON SEWAGE PUMPING STATION 3 1 99.7
Yorkshire Water Priorpot Beck REETON TERRACE NO 2 CSO 3 0 100
Yorkshire Water River Derwent OLD MALTONGATE CSO 4 0 100
Yorkshire Water Priorpot Beck REETON TERRACE NO 1 CSO 4 0 100
Yorkshire Water Cod Beck CHAPEL STREET CSO 1 0 92.8
Yorkshire Water River Derwent THE BROWS CSO 1 0 98.6
Yorkshire Water Priorpot Beck PRIORPOT BRIDGE CSO 1 0 100
Yorkshire Water Unnamed Grass Keld COLD KIRBY NO2 STW 0 0 95.2
Yorkshire Water River Seven NORMANBY SEWAGE PUMPING STATION 0 0 99
Yorkshire Water Habton Ings Drain KIRBY MISPERTON LANE SSO 0 0 0
Yorkshire Water Costa Beck AISLABY SEWAGE PUMPING STATION 0 0 100
Yorkshire Water River Kyle SCHOOL CLOSE SEWAGE PUMPING STATION 0 0 0
Yorkshire Water Culv River Swale HELPERBY MARKET CSO 0 0 66.5
Yorkshire Water North Sea Via Reighton Gill HUNMANBY GAP SPS 0 0 99.9
Yorkshire Water River Derwent HAWKSWELL LANE CSO 0 0 100
Yorkshire Water River Dove KIRKBY MILLS SEWAGE PUMPING STATION 0 0 100
Yorkshire Water Priorpot Beck BALACLAVA NO. 2 SPS 0 0 100
Yorkshire Water River Kyle BRANDSBY ROAD SSO 0 0 100
Yorkshire Water Acklam Beck ACKLAM SEWAGE PUMPING STATION 0 0 99.9
Yorkshire Water Holbeck RYEDALE CARR LANE CSO 0 0 95.6
Yorkshire Water Wath Beck RAILWAY STREET SPS 0 0 99.6

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.

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