Storm overflow register · 2025 annual return

Yorkshire Water storm overflows, 2025

Yorkshire Water reported 2,187 storm overflows in England for 2025. Together they recorded 51,431 spills over 285,931 hours, an average of 23.5 spills per overflow against 20.4 across England. That ranks 8 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 25% on 2024.

291 overflows did not spill · 196 spilled more than 60 times · 1,981 had monitors working for 90% of the year or more · 283 sewage treatment works with overflows

Hours spilling by month, 2025

025k50k75k100kJan 2025: 83,826 hours spillingJanFeb 2025: 5,531 hours spillingFebMar 2025: 3,935 hours spillingMarApr 2025: 545 hours spillingAprMay 2025: 1,606 hours spillingMayJun 2025: 1,734 hours spillingJunJul 2025: 7,048 hours spillingJulAug 2025: 729 hours spillingAugSep 2025: 20,226 hours spillingSepOct 2025: 12,651 hours spillingOctNov 2025: 64,756 hours spillingNovDec 2025: 83,310 hours spillingDec
Hours spilling, all Yorkshire Water overflows, from the start/stop records. Spills running across a month end are split between the months.

All Yorkshire Water storm overflows

Sorted by hours spilling. Open an overflow for its permit, location, reasons for high spills and improvement status.

OverflowDischarges toSpills 2025Hours 2025Spills vs 2024Monitor uptime
Albion Mills CSO
Overflow on sewer network
Company site name
ALBION MILLS/CSO
EA ID / permit
YWS01860 · WRA8571
Outlet location
SE2858917934 (OS grid reference) · View on Apple Maps
WFD catchment
Calder from River Colne to River Chald (GB104027062631)
2024 spills / hours
55 / 379
Long-term average
80.7 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 376 hours spilling →
River Calder 52 376 down 5% 100%
The Batts CSO
Overflow on sewer network
Company site name
THE BATTS/CSO
EA ID / permit
YWS01191 · WADC1411
Outlet location
NZ1745000871 (OS grid reference) · View on Apple Maps
WFD catchment
Swale from Clapgate Beck to Bedale Beck (GB104027069122)
2024 spills / hours
93 / 587
Long-term average
97.2 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 376 hours spilling →
River Swale 87 376 down 6% 100%
Howsham Sewage Treatment Works
Inlet overflow at sewage works
Sewage works
Howsham
Company site name
HOWSHAM/STW
EA ID / permit
YWS00568 · 27/28/0172
Outlet location
SE7356063000 (OS grid reference) · View on Apple Maps
WFD catchment
River Derwent from Kirkham to Elvington Beck (GB104027068312)
2024 spills / hours
25 / 136
Long-term average
16.3 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 372 hours spilling →
Unnamed Trib of River Derwent 31 372 up 24% 100%
Huddersfield STW
Storm tank at sewage works
Sewage works
Huddersfield
Company site name
BRIGHOUSE/UPPER STW/3XDWF OVERFLOW
EA ID / permit
YWS01395 · WRA7409
Outlet location
SE1729021120 (OS grid reference) · View on Apple Maps
WFD catchment
Calder from Ryburn Confluence to River Colne (GB104027062642)
2024 spills / hours
88 / 864
Long-term average
83.7 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 372 hours spilling →
River Calder & River Colne 60 372 down 32% 98%
Hawes Sewage Treatment Works
Inlet overflow at sewage works
Sewage works
Hawes
Company site name
HAWES/STW
EA ID / permit
YWS00300 · 27/22/0090
Outlet location
SD8761090250 (OS grid reference) · View on Apple Maps
WFD catchment
Ure from Duerley Beck to Mill Beck (GB104027069463)
2024 spills / hours
105 / 373
Long-term average
93.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 372 hours spilling →
River Ure 78 372 down 26% 100%
Addingham No.1 Storm Tanks
Storm discharge at pumping station
Company site name
ADDINGHAM/NO 1 SPS/PRELIMINARY TREATMENT-STW/3XDWF OVERFLOW
EA ID / permit
YWS00144 · 2482
Outlet location
SE0900049000 (OS grid reference) · View on Apple Maps
WFD catchment
Wharfe from Barben Beck/River Dibb to Hundwith Beck (GB104027064257)
Bathing water
Wharfe at Cromwheel, Ilkley
2024 spills / hours
66 / 653
Long-term average
55.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed, Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 371 hours spilling →
River Wharfe 41 371 down 38% 100%
Huddersfield STW
Inlet overflow at sewage works
Sewage works
Huddersfield
Company site name
DEIGHTON/STW
EA ID / permit
YWS01396 · WRA7409
Outlet location
SE1697019070 (OS grid reference) · View on Apple Maps
WFD catchment
River Colne from River Holme to River Calder (GB104027062550)
2024 spills / hours
86 / 451
Long-term average
71.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 369 hours spilling →
River Calder & River Colne 72 369 down 16% 100%
Otley Sewage Treatment Works
Storm tank at sewage works
Sewage works
Otley
Company site name
OTLEY/STW
EA ID / permit
YWS00192 · 27/20/0046
Outlet location
SE2103446058 (OS grid reference) · View on Apple Maps
WFD catchment
Wharfe from Hundwith Beck to River Washburn (GB104027064258)
2024 spills / hours
85 / 662
Long-term average
65.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed, Bathing Water and/or Shellfish Water investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 367 hours spilling →
River Wharfe 42 367 down 51% 100%
Harrogate Road 297 CSO
Overflow on sewer network
Company site name
HARROGATE ROAD 297/2 CSO
EA ID / permit
YWS01015 · NPSWQD005963
Outlet location
SE1949037900 (OS grid reference) · View on Apple Maps
WFD catchment
Aire from Gill Beck (Baildon) to Wyke Beck (GB104027063035)
2024 spills / hours
84 / 464
Long-term average
94.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 366 hours spilling →
The River Aire 72 366 down 14% 100%
Great Cliff PS & Storm Tank
Storm discharge at pumping station
Company site name
GREAT CLIFF/SPS
EA ID / permit
YWS00135 · 2413
Outlet location
SE3031015610 (OS grid reference) · View on Apple Maps
WFD catchment
Calder from River Colne to River Chald (GB104027062631)
2024 spills / hours
53 / 368
Long-term average
43.5 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 365 hours spilling →
Dennington Beck 39 365 down 26% 99%
Queens Square CSO
Overflow on sewer network
Company site name
QUEENS SQUARE/CSO
EA ID / permit
YWS02174 · WRA9312
Outlet location
SE1413012692 (OS grid reference) · View on Apple Maps
WFD catchment
Holme from New Mill Dike to R Colne (GB104027063301)
2024 spills / hours
67 / 324
Long-term average
65.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 365 hours spilling →
River Holme 62 365 down 7% 100%
Richmond Sewage Treatment Works
Storm tank at sewage works
Sewage works
Richmond
Company site name
RICHMOND/STW
EA ID / permit
YWS00373 · 27/23/0279
Outlet location
SE1835099890 (OS grid reference) · View on Apple Maps
WFD catchment
Swale from Clapgate Beck to Bedale Beck (GB104027069122)
2024 spills / hours
82 / 600
Long-term average
86.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 364 hours spilling →
River Swale 52 364 down 37% 100%
Northallerton & Romanby STW
Storm tank at sewage works
Sewage works
Northallerton And Romanby
Company site name
NORTHALLERTON/STW/3XDWF OVERFLOW
EA ID / permit
YWS00324 · QR27/23/0050
Outlet location
SE3505093010 (OS grid reference) · View on Apple Maps
WFD catchment
Willow Beck Catchment (trib of Wiske) (GB104027069540)
2024 spills / hours
104 / 506
Long-term average
113.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 363 hours spilling →
River Wiske 51 363 down 51% 100%
Wetherby Sewage Treatment Works
Storm tank at sewage works
Sewage works
Wetherby
Company site name
WETHERBY/STW
EA ID / permit
YWS00195 · 27/20/0054
Outlet location
SE4182047048 (OS grid reference) · View on Apple Maps
WFD catchment
Wharfe from Collingham Beck to Tadcaster Weir (GB104027064255)
Bathing water
Wharfe at Wilderness Carpark
2024 spills / hours
46 / 230
Long-term average
57.2 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed, Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 363 hours spilling →
River Wharfe 50 363 up 9% 100%
Wath Upon Dearne WwTW
Storm tank at sewage works
Sewage works
Wath Upon Dearne
Company site name
WATH ON DEARNE/STW
EA ID / permit
YWS00091 · 2172
Outlet location
SE4449001120 (OS grid reference) · View on Apple Maps
WFD catchment
River Dearne Darfield STW to River Don (GB104027063173)
2024 spills / hours
86 / 1,194
Long-term average
53.3 spills a year (monitored since 2020)
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 361 hours spilling →
Brook Dike/River Dearne 27 361 down 69% 100%
Navigation Road CSO
Overflow on sewer network
Company site name
NAVIGATION ROAD/CSO
EA ID / permit
YWS00458 · 27/24/0434
Outlet location
SE6092651736 (OS grid reference) · View on Apple Maps
WFD catchment
Tang Hall Bk/Old Foss Bk catch, trib of River Foss (GB104027063500)
2024 spills / hours
186 / 2,038
Long-term average
70.8 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 358 hours spilling →
Tang Hall Beck 71 358 down 62% 100%
Wyke Beck CSO
Overflow on sewer network
Company site name
WYKE BECK/CSO
EA ID / permit
YWS01207 · WADC1512
Outlet location
SE1453525545 (OS grid reference) · View on Apple Maps
WFD catchment
Clifton Beck from Source to River Calder (GB104027062700)
2024 spills / hours
89 / 387
Long-term average
81.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 357 hours spilling →
Bottom Hall Beck 72 357 down 19% 100%
Grimethorpe STW
Storm tank at sewage works
Sewage works
Grimethorpe
Company site name
GRIMETHORPE/STW/3XDWF OVERFLOW
EA ID / permit
YWS00103 · 2246
Outlet location
SE4025009630 (OS grid reference) · View on Apple Maps
WFD catchment
Grimethorpe Dike from Source to River Dearne (GB104027063180)
2024 spills / hours
62 / 588
Long-term average
59.0 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 355 hours spilling →
Shafton Beck 35 355 down 44% 100%
Carleton No 2 STW
Storm tank at sewage works
Sewage works
Carleton
Company site name
CARLETON/NO 2 STW
EA ID / permit
YWS00769 · 381
Outlet location
SE4632019380 (OS grid reference) · View on Apple Maps
WFD catchment
Went from Hoyle Mill Stream to Blowell Drain (GB104027063360)
2024 spills / hours
47 / 392
Long-term average
63.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 355 hours spilling →
River Little Went 45 355 down 4% 100%
Markington STW
Inlet overflow at sewage works
Sewage works
Markington
Company site name
MARKINGTON/STW
EA ID / permit
YWS00229 · 27/21/0114
Outlet location
SE2965065600 (OS grid reference) · View on Apple Maps
WFD catchment
Holbeck Catchment (GB104027064110)
2024 spills / hours
56 / 536
Long-term average
55.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 354 hours spilling →
A Tributary of the River Ure 42 354 down 25% 98%
Barber Row No 2 CSO
Overflow on sewer network
Company site name
BARBER ROW/NO 2 CSO
EA ID / permit
YWS01428 · WRA7520
Outlet location
SE0954014495 (OS grid reference) · View on Apple Maps
WFD catchment
River Colne from Wessenden Brook to R Holme (GB104027063330)
2024 spills / hours
74 / 389
Long-term average
95.8 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 351 hours spilling →
River Colne 72 351 down 3% 100%
Millhouses Park CSO
Overflow on sewer network
Company site name
MILLHOUSES PARK/CSO/RETENTION/NO 1 COMPARTMENT
EA ID / permit
YWS02244 · WRA7562
Outlet location
SK3365683262 (OS grid reference) · View on Apple Maps
WFD catchment
River Sheaf from Source to River Porter (GB104027057750)
2024 spills / hours
43 / 213
Long-term average
67.3 spills a year (monitored since 2022)
High-spill reason (company)
Performance - SW Infiltration
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 350 hours spilling →
River Sheaf 62 350 up 44% 100%
Arc Factory No 2 CSO
Overflow on sewer network
Company site name
ARC FACTORY/NO 2 CSO
EA ID / permit
YWS00372 · 27/23/0277
Outlet location
SE2036097820 (OS grid reference) · View on Apple Maps
WFD catchment
Brough Bk/Scotton Bk from Source to River Swale (GB104027068990)
2024 spills / hours
49 / 461
Long-term average
41.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 350 hours spilling →
Sour Beck 40 350 down 18% 100%
Stamford Bridge SPS
Storm discharge at pumping station
Company site name
STAMFORD BRIDGE STH/SPS
EA ID / permit
YWS00549 · 27/28/0097
Outlet location
SE7109055530 (OS grid reference) · View on Apple Maps
WFD catchment
River Derwent from Kirkham to Elvington Beck (GB104027068312)
2024 spills / hours
21 / 73
Long-term average
18.0 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 345 hours spilling →
River Derwent 38 345 up 81% 100%
Fielding Street CSO
Overflow on sewer network
Company site name
FIELDING STREET/CSO
EA ID / permit
YWS01313 · WADC927
Outlet location
SD9901127154 (OS grid reference) · View on Apple Maps
WFD catchment
Calder from Colden Water to Ryburn Confluence (GB104027062641)
2024 spills / hours
38 / 196
Long-term average
37.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 342 hours spilling →
River Calder 46 342 up 21% 100%
Meanwood Park Side CSO
Overflow on sewer network
Company site name
MEANWOOD PARK SIDE/CSO
EA ID / permit
YWS01388 · WRA7401
Outlet location
SE2820438515 (OS grid reference) · View on Apple Maps
WFD catchment
Meanwood Beck from Source to River Aire (GB104027062900)
2024 spills / hours
60 / 352
Long-term average
55.7 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 342 hours spilling →
Adel Beck 57 342 down 5% 98%
Bobbinmill Lane CSO
Overflow on sewer network
Company site name
BOBBINMILL LANE/CSO
EA ID / permit
YWS01569 · WRA8085
Outlet location
SK3654770595 (OS grid reference) · View on Apple Maps
WFD catchment
Hipper from Source to River Rother (GB104027057660)
2024 spills / hours
70 / 364
Long-term average
67.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 339 hours spilling →
River Hipper 57 339 down 19% 100%
South Farm Sewage Pumping Station
Storm discharge at pumping station
Company site name
SCRAYINGHAM SOUTH FM/CSO
EA ID / permit
YWS00563 · 27/28/0145
Outlet location
SE7297159850 (OS grid reference) · View on Apple Maps
WFD catchment
River Derwent from Kirkham to Elvington Beck (GB104027068312)
2024 spills / hours
56 / 370
Long-term average
54.5 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 339 hours spilling →
The Goit via A Culvertedsystem 42 339 down 25% 98%
Ellerker Todds Lane SPS
Storm discharge at pumping station
Company site name
ELLERKER TODDS LN/CSO
EA ID / permit
YWS01498 · WRA7934
Outlet location
SE9201029120 (OS grid reference) · View on Apple Maps
WFD catchment
Mill Beck 2 (Ellerker Area) (GB104026066660)
2024 spills / hours
6 / 16
Long-term average
5.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 339 hours spilling →
Unnamed Trib of Ellerker Drain 24 339 up 300% 100%
Worsbrough STW
Storm tank at sewage works
Sewage works
Worsbrough
Company site name
WORSBROUGH/STW
EA ID / permit
YWS01390 · WRA7404
Outlet location
SE3628003430 (OS grid reference) · View on Apple Maps
WFD catchment
Dove from Source to River Dearne (GB104027057510)
2024 spills / hours
42 / 331
Long-term average
45.8 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation ongoing
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 338 hours spilling →
River Dove 36 338 down 14% 100%
Rawcliffe (York) STW
Storm tank at sewage works
Sewage works
Rawcliffe
Company site name
RAWCLIFFE YORK/STW
EA ID / permit
YWS00383 · 27/24/0129
Outlet location
SE5876052900 (OS grid reference) · View on Apple Maps
WFD catchment
Ouse from River Nidd to Stillingfleet Beck (GB104027069593)
2024 spills / hours
44 / 437
Long-term average
31.2 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 334 hours spilling →
River Ouse/Rawcliffe Ings Dr 34 334 down 23% 100%
Catcliffe Road CSO
Overflow on sewer network
Company site name
CATCLIFFE ROAD/NO 2 CSO
EA ID / permit
YWS01624 · WRA8160
Outlet location
SK3945087890 (OS grid reference) · View on Apple Maps
WFD catchment
Car Brook from Source to River Don (GB104027057360)
2024 spills / hours
40 / 355
Long-term average
61.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 331 hours spilling →
Car Brook 32 331 down 20% 100%
Ellerton CSO
Overflow on sewer network
Company site name
ELLERTON/CSO
EA ID / permit
YWS02215 · YWUCD2/36
Outlet location
SE7030239805 (OS grid reference) · View on Apple Maps
WFD catchment
River Derwent from Elvington Beck to River Ouse (GB104027068311)
2024 spills / hours
84 / 689
Long-term average
87.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 330 hours spilling →
Drain to River Derwent 52 330 down 38% 96%
Nun Monkton Sewage Treatment Works
Inlet overflow at sewage works
Sewage works
Nun Monkton
Company site name
NUN MONKTON/STW
EA ID / permit
YWS00237 · 27/21/0142
Outlet location
SE5119057580 (OS grid reference) · View on Apple Maps
WFD catchment
River Nidd from Crimple Beck to River Ouse (GB104027068292)
2024 spills / hours
71 / 570
Long-term average
58.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 330 hours spilling →
River Nidd 50 330 down 30% 100%
Woodhouse Mill WwTW
Storm tank at sewage works
Sewage works
Woodhouse Mill
Company site name
WOODHOUSE MILL/NO 2 STW
EA ID / permit
YWS00702 · 3334(SS)
Outlet location
SK4336086240 (OS grid reference) · View on Apple Maps
WFD catchment
Rother, Doe Lea to Don (GB104027057772)
2024 spills / hours
45 / 307
Long-term average
51.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 330 hours spilling →
River Rother 50 330 up 11% 100%
Avenue Farm CSO
Overflow on sewer network
Company site name
AVENUE FARM/CSO
EA ID / permit
YWS01941 · WRA8731
Outlet location
SK3958567956 (OS grid reference) · View on Apple Maps
WFD catchment
Rother from Redleadmill Brook to Spital Brook (GB104027057630)
2024 spills / hours
80 / 386
Long-term average
78.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 330 hours spilling →
River Rother 66 330 down 18% 100%
Cold Hiendley STW
Storm tank at sewage works
Sewage works
Cold Hiendley
Company site name
COLD HIENDLEY/STW
EA ID / permit
YWS00784 · 431
Outlet location
SE3701014540 (OS grid reference) · View on Apple Maps
WFD catchment
Owler Beck from Source to River Calder (GB104027062530)
2024 spills / hours
63 / 434
Long-term average
133.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 329 hours spilling →
Cold Hiendley Reservoir 41 329 down 35% 100%
Cuckstool Bottom CSO
Overflow on sewer network
Company site name
CUCKSTOOL BOTTOM/CSO
EA ID / permit
YWS00679 · 3205
Outlet location
SE2360108924 (OS grid reference) · View on Apple Maps
WFD catchment
Dearne from Source to Bentley Brook (GB104027063220)
2024 spills / hours
68 / 287
Long-term average
66.2 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 326 hours spilling →
River Dearne 57 326 down 16% 100%
Dalton Ici North No 2 CSO
Overflow on sewer network
Company site name
DALTON ICI NORTH/NO 2 CSO
EA ID / permit
YWS01752 · WRA8422
Outlet location
SE1699117662 (OS grid reference) · View on Apple Maps
WFD catchment
Fenay beck from Source to River Colne (GB104027063340)
2024 spills / hours
80 / 402
Long-term average
85.7 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 326 hours spilling →
Lees Head Beck 65 326 down 19% 100%
Darton STW
Storm tank at sewage works
Sewage works
Darton
Company site name
DARTON/STW/3XDWF OVERFLOW
EA ID / permit
YWS00076 · 2026
Outlet location
SE3251008970 (OS grid reference) · View on Apple Maps
WFD catchment
River Dearne from Cawthorne Dyke to Lundwood STW (GB104027063171)
2024 spills / hours
53 / 367
Long-term average
64.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 325 hours spilling →
River Dearne 40 325 down 25% 100%
Brimington Road North CSO
Overflow on sewer network
Company site name
BRIMINGTON ROAD NTH/CSO
EA ID / permit
YWS01996 · WRA9088
Outlet location
SK3893073717 (OS grid reference) · View on Apple Maps
WFD catchment
Drone from Source to River Whitting (GB104027057710)
2024 spills / hours
80 / 482
Long-term average
78.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 324 hours spilling →
River Whitting 60 324 down 25% 100%
The Granary CSO
Overflow on sewer network
Company site name
THE GRANARY/CSO
EA ID / permit
YWS00114 · 2299
Outlet location
SE2720059100 (OS grid reference) · View on Apple Maps
WFD catchment
Nidd from Burstwith to Oak Beck (GB104027068296)
2024 spills / hours
82 / 442
Long-term average
65.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed, Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 321 hours spilling →
Nidd and Tribs 41 321 down 50% 93%
Permit applied for
Overflow on sewer network
Company site name
SELBY ROAD WISTOW/CSO
EA ID / permit
YWS02270 · Permit applied for
Outlet location
SE5950135128 (OS grid reference) · View on Apple Maps
WFD catchment
Holmes Dike catchment (trib of Ouse) (GB104027063650)
2024 spills / hours
97 / 1,437
Long-term average
67.3 spills a year (monitored since 2023)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 320 hours spilling →
Permit applied for 43 320 down 56% 92%
Permit applied for
Inlet overflow at sewage works
Sewage works
Permit Applied For
Company site name
WEST BURTON/STW
EA ID / permit
YWS00037 · Permit applied for
Outlet location
SE0130087500 (OS grid reference) · View on Apple Maps
WFD catchment
Bishopdale Bk from Source to Walden Beck (GB104027069360)
2024 spills / hours
129 / 721
Long-term average
109.2 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 318 hours spilling →
Permit applied for 88 318 down 32% 100%
Permit applied for
Overflow on sewer network
Company site name
FISHERGATE 20/CSO
EA ID / permit
YWS02253 · Permit applied for
Outlet location
SE6058251097,SE6058351087 (OS grid reference) · View on Apple Maps
WFD catchment
River Foss from the Syke to the River Ouse (GB104027063520)
2024 spills / hours
66 / 1,248
Long-term average
45.7 spills a year (monitored since 2023)
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 317 hours spilling →
Permit applied for 29 317 down 56% 100%
Aldwarke WwTW
Storm tank at sewage works
Sewage works
Aldwarke
Company site name
ALDWARKE/STW
EA ID / permit
YWS00864 · C4954
Outlet location
SK4506094470 (OS grid reference) · View on Apple Maps
WFD catchment
Don from Greasborough Dyke to River Dearne (GB104027057452)
2024 spills / hours
43 / 425
Long-term average
49.7 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Monitor below 90%
Comms failure / issue · Resolved - Apr
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 316 hours spilling →
River Don 39 316 down 9% 86%
Marsh Lane SPS & Storm Tank Site
Storm discharge at pumping station
Company site name
KNOTTINGLEY MARSH LN/CSO
EA ID / permit
YWS01437 · WRA7551
Outlet location
SE5100024090 (OS grid reference) · View on Apple Maps
WFD catchment
Aire from Fryston Beck to River Ouse (GB104027063037)
2024 spills / hours
55 / 625
Long-term average
46.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation completed, UWWTR investigation completed, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 315 hours spilling →
River Aire 33 315 down 40% 100%
SSO at Great Ouseburn(East)
Overflow on sewer network
Company site name
GREAT OUSEBURN EAST/CSO
EA ID / permit
YWS00706 · 3352(SS)
Outlet location
SE4480061400 (OS grid reference) · View on Apple Maps
WFD catchment
River Ouse from Source to River Ure (GB104027063800)
2024 spills / hours
75 / 262
Long-term average
64.2 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 314 hours spilling →
Trib Ouse Gill Beck 68 314 down 9% 99%
Pole Moor SPS
Storm discharge at pumping station
Company site name
POLE MOOR/CSO
EA ID / permit
YWS01495 · WRA7925
Outlet location
SE0694016350 (OS grid reference) · View on Apple Maps
WFD catchment
Black Brook from Source to River Calder (GB104027062570)
2024 spills / hours
54 / 478
Long-term average
64.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 312 hours spilling →
Red Lane Dike 36 312 down 33% 100%
Bailiff Bridge CSO
Overflow on sewer network
Company site name
HALIFAX OLD ROAD/CSO
EA ID / permit
YWS00900 · EPR/AP3920PV
Outlet location
SE1147425554 (OS grid reference) · View on Apple Maps
WFD catchment
Red Beck, Source to Calder and Hebble Navigation (GB104027062720)
2024 spills / hours
42 / 134
Long-term average
39.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - hydraulic capacity
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 311 hours spilling →
Not matched in Ea Consents Database 62 311 up 48% 100%

Sewage treatment works

Storm tanks and inlet overflows at each Yorkshire Water sewage works. The figures are 2025 spills.

← All water companies · Contains Environment Agency data licensed under the Open Government Licence v3.0. How to read the data.