Storm overflow register · 2025 annual return

United Utilities storm overflows, 2025

United Utilities reported 2,270 storm overflows in England for 2025. Together they recorded 60,843 spills over 327,452 hours, an average of 26.8 spills per overflow against 20.4 across England. That ranks 9 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 23% on 2024.

295 overflows did not spill · 313 spilled more than 60 times · 2,076 had monitors working for 90% of the year or more · 289 sewage treatment works with overflows

Hours spilling by month, 2025

025k50k75k100kJan 2025: 69,814 hours spillingJanFeb 2025: 7,561 hours spillingFebMar 2025: 1,763 hours spillingMarApr 2025: 484 hours spillingAprMay 2025: 4,089 hours spillingMayJun 2025: 13,148 hours spillingJunJul 2025: 6,622 hours spillingJulAug 2025: 2,053 hours spillingAugSep 2025: 41,625 hours spillingSepOct 2025: 22,376 hours spillingOctNov 2025: 71,264 hours spillingNovDec 2025: 86,587 hours spillingDec
Hours spilling, all United Utilities overflows, from the start/stop records. Spills running across a month end are split between the months.

All United Utilities 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
A591 Bus Shelter CSO 021BY
Overflow on sewer network
Company site name
A591/Bus Shelter CSO
EA ID / permit
UUP00067 · 01ALL0026
Outlet location
NY2587025070 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent US Bassenthwaite Lake (GB112075073561)
2024 spills / hours
68 / 232
Long-term average
78.2 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 551 hours spilling →
Applethwaite Gill 72 551 up 6% 96%
Mickle Trafford Pumping Station
Storm discharge at pumping station
Company site name
Mickle Trafford PS
EA ID / permit
UUP01293 · 016892313
Outlet location
SJ4408070700 (OS grid reference) · View on Apple Maps
WFD catchment
Stanney Mill Brook (GB112068060260)
2024 spills / hours
95 / 1,407
Long-term average
51.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 551 hours spilling →
Trib of Stanney Mill Brook 44 551 down 54% 98%
Tallentire Pumping Station
Storm discharge at pumping station
Company site name
Tallentire (West) PS
EA ID / permit
UUP01897 · 017570058
Outlet location
NY1003235482 (OS grid reference) · View on Apple Maps
WFD catchment
Broughton Beck (GB112075073570)
2024 spills / hours
73 / 479
Long-term average
73.9 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 550 hours spilling →
Unnamed Trib of Broughton Beck 73 550 no change 100%
Hellifield WwTW
Inlet overflow at sewage works
Sewage works
Hellifield
Company site name
HELLIFIELD WwTW
EA ID / permit
UUP00936 · 017160036
Outlet location
SD8475856288 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble (Long Preston to Stock Beck) (GB112071065613)
2024 spills / hours
172 / 620
Long-term average
130.2 spills a year (monitored since 2021)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 547 hours spilling →
Hellifield (Pan) Beck 120 547 down 30% 100%
Askham Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Askham
Company site name
Askham Wastewater Treatment Works (ASKHM) (017670078)
EA ID / permit
UUP00148 · 017670078
Outlet location
NY5183023670 (OS grid reference) · View on Apple Maps
WFD catchment
Lowther (Lower) (GB102076071010)
2024 spills / hours
67 / 321
Long-term average
90.3 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 543 hours spilling →
River Lowther 76 543 up 13% 98%
Longtown WwTW
Storm tank at sewage works
Sewage works
Longtown
Company site name
LONGTOWN WwTW
EA ID / permit
UUP01182 · 017770003
Outlet location
NY3751068430 (OS grid reference) · View on Apple Maps
WFD catchment
Esk (Eden and Esk) (GB102077074190)
2024 spills / hours
44 / 275
Long-term average
54.6 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 536 hours spilling →
River Esk (Border) 67 536 up 52% 78%
Tbc
Storm discharge at pumping station
Company site name
Gamesley PS
EA ID / permit
UUP02211 · Unpermitted
Outlet location
SK0058194886 (OS grid reference) · View on Apple Maps
WFD catchment
Etherow (Glossop Brook to Goyt) (GB112069061050)
2024 spills / hours
83 / 634
Long-term average
70.5 spills a year (monitored since 2024)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 534 hours spilling →
River Etherow 58 534 down 30% 100%
Tbc
Storm discharge at pumping station
Company site name
Liverpool Road PS (49039)
EA ID / permit
UUP02220 · Permit applied for
Outlet location
SD4617216371 (OS grid reference) · View on Apple Maps
WFD catchment
Douglas - Lower (GB112070064820)
2024 spills / hours
0 / 0.0
Long-term average
22.5 spills a year (monitored since 2024)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 532 hours spilling →
River Douglas 45 532 up from 0 100%
Hyndburn WwTW Hynbd
Storm tank at sewage works
Sewage works
Hyndburn Hynbd
Company site name
Hyndburn WwTW
EA ID / permit
UUP01013 · 017160008
Outlet location
SD7562033370 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
62 / 541
Long-term average
66.7 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 525 hours spilling →
River Calder (Ribble) 53 525 down 15% 100%
Mh 63 East End of Copster Green CSO
Overflow on sewer network
Company site name
M/H 63 East End of Copster Green CSO
EA ID / permit
UUP01290 · EPRSB3396AJ
Outlet location
SD6815034230 (OS grid reference) · View on Apple Maps
WFD catchment
Showley Brook (GB112071065710)
2024 spills / hours
105 / 479
Long-term average
104.6 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 523 hours spilling →
Trib of Dinckley Brook 106 523 up 1% 100%
Warrington North WwTW
Storm tank at sewage works
Sewage works
Warrington North
Company site name
WARRINGTON NORTH WwTW
EA ID / permit
UUP02022 · 016983122
Outlet location
SJ5804086890 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
2024 spills / hours
96 / 1,091
Long-term average
108.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 520 hours spilling →
Mersey Estuary 59 520 down 39% 100%
Barlow Moor Road
Overflow on sewer network
Company site name
Barlow Moor Road / Rowsley Avenue CSO
EA ID / permit
UUP00188 · 01MAN0244
Outlet location
SJ8329091780 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
75 / 539
Long-term average
74.1 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 517 hours spilling →
River Mersey 79 517 up 5% 97%
Deanscales PS & CSO
Storm discharge at pumping station
Company site name
Deanscales PS and CSO
EA ID / permit
UUP00625 · 017570034
Outlet location
NY0922026470 (OS grid reference) · View on Apple Maps
WFD catchment
Marron (GB112075070540)
2024 spills / hours
108 / 626
Long-term average
103.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 517 hours spilling →
Trib of Far Stock Beck 77 517 down 29% 100%
Stainton (Snuff Mill) SSO
Overflow on sewer network
Company site name
Stainton SSO
EA ID / permit
UUP01834 · 017680275
Outlet location
NY4906027430 (OS grid reference) · View on Apple Maps
WFD catchment
Eamont (Upper) (GB102076071020)
2024 spills / hours
56 / 664
Long-term average
68.2 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 516 hours spilling →
River Eamont 54 516 down 4% 100%
Gisburn WwTW Gisbn
Inlet overflow at sewage works
Sewage works
Gisburn Gisbn
Company site name
GISBURN WwTW
EA ID / permit
UUP00795 · 017160034
Outlet location
SD8190049520 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble DS Stock Beck (GB112071065612)
2024 spills / hours
123 / 849
Long-term average
135.1 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 516 hours spilling →
River Ribble 96 516 down 22% 100%
Oakenrod Combined Sewer Overflow
Overflow on sewer network
Company site name
OAKENROD CSO
EA ID / permit
UUP01431 · 016982276
Outlet location
SD8879013050 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Spodden to Irwell) (GB112069064600)
2024 spills / hours
101 / 662
Long-term average
105.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 509 hours spilling →
River Roch 87 509 down 14% 100%
Hacken Works CSO
Overflow on sewer network
Company site name
West of Hacken Works (Syphon) CSO
EA ID / permit
UUP00871 · 016993558
Outlet location
SD7334007810 (OS grid reference) · View on Apple Maps
WFD catchment
Croal (including Blackshaw Brook) (GB112069064550)
2024 spills / hours
133 / 758
Long-term average
137.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 506 hours spilling →
River Croal 100 506 down 25% 100%
Long Preston WwTW Lngpr
Inlet overflow at sewage works
Sewage works
Long Preston Lngpr
Company site name
Long Preston Wastewater Treatment Works (LNGPR) (017160041)
EA ID / permit
UUP01175 · 017160041
Outlet location
SD8306057620 (OS grid reference) · View on Apple Maps
WFD catchment
Long Preston Beck (GB112071065600)
2024 spills / hours
119 / 1,256
Long-term average
123.1 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 506 hours spilling →
Long Preston Beck Trib R Ribbl 54 506 down 55% 100%
St Helens STW
Storm tank at sewage works
Sewage works
St Helens
Company site name
St Helens Wastewater Treatment Works (Site STHEL) (016920130)
EA ID / permit
UUP01819 · 016920130
Outlet location
SJ5358095920 (OS grid reference) · View on Apple Maps
WFD catchment
Sankey Brook (Rainford Brook to Mersey) (GB112069061200)
2024 spills / hours
65 / 729
Long-term average
75.8 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 504 hours spilling →
Sankey Brook 42 504 down 35% 100%
Warrington South WwTW
Storm tank at sewage works
Sewage works
Warrington South
Company site name
WARRINGTON SOUTH WwTW
EA ID / permit
UUP02029 · 016820128
Outlet location
SJ5870085580 (OS grid reference) · View on Apple Maps
WFD catchment
Manchester Ship Canal (GB71210004)
2024 spills / hours
82 / 910
Long-term average
128.8 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 503 hours spilling →
Manchester Ship Canal 51 503 down 38% 100%
Sion Street CSO 09026
Overflow on sewer network
Company site name
Sion Street CSO
EA ID / permit
UUP01760 · 01BRY0032
Outlet location
SD7795006820 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Roch to Croal) (GB112069060840)
2024 spills / hours
74 / 845
Long-term average
67.7 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 496 hours spilling →
River Irwell 61 496 down 18% 100%
Hellifield WwTW
Storm tank at sewage works
Sewage works
Hellifield
Company site name
HELLIFIELD WwTW
EA ID / permit
UUP00935 · 017160036
Outlet location
SD8475856288 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble (Long Preston to Stock Beck) (GB112071065613)
2024 spills / hours
135 / 433
Long-term average
80.6 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 492 hours spilling →
Hellifield (Pan) Beck 103 492 down 24% 100%
Bothel Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Bothel
Company site name
BOTHEL WwTW
EA ID / permit
UUP00287 · 017570066
Outlet location
NY1825039470 (OS grid reference) · View on Apple Maps
WFD catchment
Ellen (lower) (GB112075073640)
2024 spills / hours
115 / 519
Long-term average
158.3 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 492 hours spilling →
Bothel Beck (Gill Gooden) 113 492 down 2% 99%
Irlam Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Irlam
Company site name
IRLAM WwTW
EA ID / permit
UUP01025 · 016940133
Outlet location
SJ7018092020 (OS grid reference) · View on Apple Maps
WFD catchment
Glaze (GB112069061420)
2024 spills / hours
83 / 690
Long-term average
118.0 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 488 hours spilling →
River Glaze (Glaze Brook) 63 488 down 24% 100%
West End/ Wharf Road CSO 425F3
Overflow on sewer network
Company site name
West End Wharf Road CSO
EA ID / permit
UUP02076 · 016982990
Outlet location
SJ5665094800 (OS grid reference) · View on Apple Maps
WFD catchment
Sankey Brook (Rainford Brook to Mersey) (GB112069061200)
2024 spills / hours
13 / 46
Long-term average
25.0 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 486 hours spilling →
Sankey Brook 35 486 up 169% 95%
Seascale WwTW
Storm tank at sewage works
Sewage works
Seascale
Company site name
Seascale Wastewater Treatment Works (Site ID SEASC) (017480324)
EA ID / permit
UUP01732 · 017480324
Outlet location
NY0403000930 (OS grid reference) · View on Apple Maps
WFD catchment
Cumbria (GB641211630002)
Bathing water
Seascale
2024 spills / hours
62 / 628
Long-term average
59.0 spills a year (monitored since 2017)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 484 hours spilling →
The Irish Sea and Whitriggs Beck 41 484 down 34% 100%
Birtenshaw Farm CSO
Overflow on sewer network
Company site name
Birtenshaw Farm CSO (BOL0151)
EA ID / permit
UUP00246 · 016983224
Outlet location
SD7257012620 (OS grid reference) · View on Apple Maps
WFD catchment
Eagley Brook (GB112069064570)
2024 spills / hours
128 / 582
Long-term average
124.3 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 484 hours spilling →
Eagley Brook 98 484 down 23% 100%
Ravenstonedale STW
Inlet overflow at sewage works
Sewage works
Ravenstonedale
Company site name
RAVENSTONEDALE WwTW
EA ID / permit
UUP01614 · 017670024
Outlet location
NY7212004600 (OS grid reference) · View on Apple Maps
WFD catchment
Scandal Beck (GB102076070600)
2024 spills / hours
83 / 727
Long-term average
111.8 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 480 hours spilling →
Sandal Beck 49 480 down 41% 99%
Alderley Edge WwTW CSO
Overflow on sewer network
Company site name
Alderley Edge WwTW CSO MAC0174
EA ID / permit
UUP00099 · 016892364
Outlet location
SJ8302078810 (OS grid reference) · View on Apple Maps
WFD catchment
Mobberley Brook (GB112069061330)
2024 spills / hours
61 / 451
Long-term average
80.4 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 479 hours spilling →
Carr Brook 60 479 down 2% 100%
Wigan Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Wigan
Company site name
WIGAN (HOSCAR) WwTW
EA ID / permit
UUP02131 · 017081316
Outlet location
SD4817012020 (OS grid reference) · View on Apple Maps
WFD catchment
Douglas - Lower (GB112070064820)
Bathing water
Southport; St Annes; St. Annes North; Blackpool South
2024 spills / hours
45 / 829
Long-term average
48.8 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 478 hours spilling →
River Douglas 33 478 down 27% 100%
Dearham Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Dearham
Company site name
DEARHAM WwTW
EA ID / permit
UUP00627 · 017570068
Outlet location
NY0704036760 (OS grid reference) · View on Apple Maps
WFD catchment
Ellen (lower) (GB112075073640)
Bathing water
Allonby
2024 spills / hours
124 / 734
Long-term average
156.1 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement ongoing
Volume & pollution
Estimate from 476 hours spilling →
River Ellen 83 476 down 33% 100%
Greenodd Pumping Station
Storm discharge at pumping station
Company site name
Greenodd Sewage Pumping Station (Site ID 398CS, GREEN ) (LAK0109)
EA ID / permit
UUP00855 · EPRFP3828XR
Outlet location
SD3148082410 (OS grid reference) · View on Apple Maps
WFD catchment
LEVEN - transitional (GB531207311900)
2024 spills / hours
102 / 1,067
Long-term average
72.1 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 476 hours spilling →
River Leven 52 476 down 49% 100%
Bowness-on-Solway Pumping Station
Storm discharge at pumping station
Company site name
Bowness on Solway PS
EA ID / permit
UUP00292 · 017680457
Outlet location
NY2251162891 (OS grid reference) · View on Apple Maps
WFD catchment
SOLWAY (GB530207614700)
2024 spills / hours
48 / 484
Long-term average
43.0 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 475 hours spilling →
The Solway Firth 37 475 down 23% 99%
Field East of River Darwin CSO
Overflow on sewer network
Company site name
Field East of River Darwin CSO
EA ID / permit
UUP00729 · 017190837
Outlet location
SD5585027830 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - conf Roddlesworth to tidal (GB112071065300)
Bathing water
St Annes
Shellfish water
Ribble
2024 spills / hours
96 / 564
Long-term average
99.8 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 474 hours spilling →
River Darwin 56 474 down 42% 99%
Kirkby Stephen WwTW
Inlet overflow at sewage works
Sewage works
Kirkby Stephen
Company site name
Kirkby Stephen WwTW
EA ID / permit
UUP01079 · 017670013
Outlet location
NY7717010460 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - headwaters to Scandal Beck (GB102076070590)
2024 spills / hours
113 / 587
Long-term average
87.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 469 hours spilling →
River Eden 102 469 down 10% 100%
Ashton-Under-Lyne WwTW
Storm tank at sewage works
Sewage works
Ashton Under Lyne
Company site name
ASHTON-UNDER-LYNE WwTW
EA ID / permit
UUP00146 · 016940085
Outlet location
SJ9300097140 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
44 / 477
Long-term average
46.8 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 467 hours spilling →
River Tame 39 467 down 11% 100%
Grange Bridge PS Gngbo ALL0062
Storm discharge at pumping station
Company site name
Grange Bridge (200mtrs downstream)
EA ID / permit
UUP00823 · 017570113
Outlet location
NY2550017600 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent - Stonethwaite Beck to conf Greta (GB112075070410)
2024 spills / hours
57 / 354
Long-term average
60.4 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 465 hours spilling →
River Derwent 53 465 down 7% 100%
Gilsland WwTW
Inlet overflow at sewage works
Sewage works
Gilsland
Company site name
GILSLAND WwTW
EA ID / permit
UUP00792 · 017670091
Outlet location
NY6290066400 (OS grid reference) · View on Apple Maps
WFD catchment
Irthing DS Crammel Linn Waterfall (GB102076073981)
2024 spills / hours
100 / 408
Long-term average
106.5 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 464 hours spilling →
River Irthing 80 464 down 20% 100%
295 Bacup Road CSO
Overflow on sewer network
EA ID / permit
UUP00033 · 01ROS0008
Outlet location
SD8195022630 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Cowpe Bk to Rossendale STW) (GB112069064641)
2024 spills / hours
48 / 224
Long-term average
64.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 458 hours spilling →
River Irwell 73 458 up 52% 99%
Disley PS
Storm discharge at pumping station
Company site name
Disley PS
EA ID / permit
UUP00642 · 016982849
Outlet location
SJ9812085420 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Sett to Etherow) (GB112069060960)
2024 spills / hours
88 / 503
Long-term average
96.7 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 457 hours spilling →
River Goyt 86 457 down 2% 100%
Morland Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Morland
Company site name
MORLAND WwTW
EA ID / permit
UUP01342 · 017670019
Outlet location
NY5974022750 (OS grid reference) · View on Apple Maps
WFD catchment
Morland Beck (GB102076070830)
2024 spills / hours
135 / 600
Long-term average
195.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 456 hours spilling →
Morland Beck 107 456 down 21% 100%
Leigh WwTW
Storm tank at sewage works
Sewage works
Leigh
Company site name
LEIGH WwTW
EA ID / permit
UUP01131 · 016920134
Outlet location
SJ6581099000 (OS grid reference) · View on Apple Maps
WFD catchment
Pennington Brook (Glaze) (GB112069060760)
2024 spills / hours
58 / 695
Long-term average
66.3 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 455 hours spilling →
Pennington Brook 47 455 down 19% 86%
Os 49 St Andrews Road CSO 38028
Overflow on sewer network
Company site name
Outside 49 St Andrews Road CSO
EA ID / permit
UUP01480 · 016982650
Outlet location
SD2954201574 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY MOUTH - transitional (GB641211630001)
2024 spills / hours
109 / 715
Long-term average
91.0 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 453 hours spilling →
Mersey Estuary 70 453 down 36% 99%
Clitheroe Road CSO
Overflow on sewer network
Company site name
Clitheroe Road CSO
EA ID / permit
UUP00324 · 017160098
Outlet location
SD8402036360 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
105 / 515
Long-term average
111.2 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 451 hours spilling →
Pendle Water 84 451 down 20% 99%
Lawton Gate WwTW
Storm tank at sewage works
Sewage works
Lawton Gate
Company site name
LAWTON GATE WwTW
EA ID / permit
UUP01120 · 016810085
Outlet location
SJ8087056519 (OS grid reference) · View on Apple Maps
WFD catchment
Kidsgrove Stream (including Day Green Stream) (GB112068055390)
2024 spills / hours
50 / 693
Long-term average
40.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 450 hours spilling →
Kidsgrove Stream 33 450 down 34% 100%
Gubberford Lane Pumping Station
Storm discharge at pumping station
Company site name
Gubberford Lane PS
EA ID / permit
UUP01729 · 017260047
Outlet location
SD4998048260 (OS grid reference) · View on Apple Maps
WFD catchment
Wyre - Upper (GB112072065821)
2024 spills / hours
80 / 543
Long-term average
73.4 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 448 hours spilling →
River Wyre 71 448 down 11% 100%
Garstang Rd/Great Eccleston PS
Storm discharge at pumping station
Company site name
Garstang Rd, Great Eccleston PS (Site ID 52544) (WYR0051)
EA ID / permit
UUP00774 · 017260155
Outlet location
SD4325040650 (OS grid reference) · View on Apple Maps
WFD catchment
Wyre - conf R Brock to tidal (GB112072066250)
Bathing water
Morecambe South
2024 spills / hours
100 / 575
Long-term average
86.6 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 447 hours spilling →
River Wyre 73 447 down 27% 100%
Settle Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Settle
Company site name
SETTLE WwTW
EA ID / permit
UUP01737 · 017160045
Outlet location
SD8080261962 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble (Stainforth to Long Preston Beck) (GB112071065614)
2024 spills / hours
71 / 537
Long-term average
82.2 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 446 hours spilling →
River Ribble 59 446 down 17% 99%
Mossley STW
Storm tank at sewage works
Sewage works
Mossley
Company site name
MOSSLEY WwTW
EA ID / permit
UUP01351 · 016940089
Outlet location
SD9732000880 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
211 / 2,839
Long-term average
125.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 444 hours spilling →
River Tame 48 444 down 77% 99%
Melandra Road Pumping Station
Storm discharge at pumping station
Company site name
Melandra Road PS
EA ID / permit
UUP01275 · 016982612
Outlet location
SK0101095240 (OS grid reference) · View on Apple Maps
WFD catchment
Glossop Brook (Long Clough Brook to Etherow) (GB112069060720)
2024 spills / hours
102 / 371
Long-term average
54.4 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 444 hours spilling →
Glossop Brook 87 444 down 15% 99%

Sewage treatment works

Storm tanks and inlet overflows at each United Utilities 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.