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
Hayes Castle Farm CSO (02628)
Overflow on sewer network
Company site name
Rear of Hayes Castle Farm CSO
EA ID / permit
UUP00924 · 017580390
Outlet location
NY0006022370 (OS grid reference) · View on Apple Maps
WFD catchment
Lowca Beck (GB112074070040)
2024 spills / hours
97 / 437
Long-term average
85.0 spills a year (monitored since 2021)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 442 hours spilling →
Distington Beck 92 442 down 5% 100%
Glazebury WwTW
Storm tank at sewage works
Sewage works
Glazebury
Company site name
GLAZEBURY WwTW
EA ID / permit
UUP00802 · 016920350
Outlet location
SJ6768095920 (OS grid reference) · View on Apple Maps
WFD catchment
Glaze (GB112069061420)
2024 spills / hours
59 / 548
Long-term average
75.6 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 441 hours spilling →
River Glaze 50 441 down 15% 100%
Spa Road CSO 07017
Overflow on sewer network
Company site name
Spa Road CSO
EA ID / permit
UUP01797 · 016982192
Outlet location
SD7070009100 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
51 / 598
Long-term average
59.8 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 441 hours spilling →
River Croal 45 441 down 12% 100%
Cowling Farm CSO
Overflow on sewer network
Company site name
Cowling Farm CSO
EA ID / permit
UUP00552 · NPSWQD010697
Outlet location
SD5577114819 (OS grid reference) · View on Apple Maps
WFD catchment
Yarrow DS Big Lodge Water (GB112070064952)
2024 spills / hours
44 / 602
Long-term average
64.9 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 437 hours spilling →
Clancutt Brook 33 437 down 25% 100%
Stockport WwTW
Inlet overflow at sewage works
Sewage works
Stockport
Company site name
STOCKPORT WwTW
EA ID / permit
UUP01867 · 016940151
Outlet location
SJ8652089820 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
64 / 346
Long-term average
79.1 spills a year (monitored since 2017)
High-spill reason (company)
Performance - Pump failure / issue
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 437 hours spilling →
River Mersey 82 437 up 28% 100%
Mill Lane CSO 49201
Overflow on sewer network
Company site name
Mill Lane CSO
EA ID / permit
UUP01313 · 017091498
Outlet location
SD5237109191 (OS grid reference) · View on Apple Maps
WFD catchment
Douglas - Lower (GB112068055360)
2024 spills / hours
130 / 593
Long-term average
119.6 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 435 hours spilling →
River Douglas 91 435 down 30% 90%
Burnley STW
Storm tank at sewage works
Sewage works
Burnley
Company site name
BURNLEY WwTW
EA ID / permit
UUP00373 · 017160005
Outlet location
SD8285035120 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
112 / 1,573
Long-term average
115.3 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 435 hours spilling →
River Calder (Ribble) 38 435 down 66% 99%
Liverpool WwTW
Storm tank at sewage works
Sewage works
Liverpool
Company site name
LIVERPOOL WwTW
EA ID / permit
UUP01162 · 016993397
Outlet location
SJ3321592641 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
2024 spills / hours
103 / 1,100
Long-term average
65.9 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 434 hours spilling →
Mersey Estuary 60 434 down 42% 100%
Horton-in-Ribblesdale STW
Storm tank at sewage works
Sewage works
Horton In Ribblesdale
Company site name
HORTON-IN-RIBBLESDALE WwTW
EA ID / permit
UUP00990 · 017160039
Outlet location
SD8071572125 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble - Brants Ghyll to conf Stainforth Beck (GB112071065640)
2024 spills / hours
89 / 916
Long-term average
111.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 433 hours spilling →
River Ribble 35 433 down 61% 100%
Sedbergh STW
Storm tank at sewage works
Sewage works
Sedbergh
Company site name
SEDBERGH WwTW
EA ID / permit
UUP01733 · 017270009
Outlet location
SD6512091160 (OS grid reference) · View on Apple Maps
WFD catchment
Rawthey - Lower (GB112072071710)
2024 spills / hours
66 / 640
Long-term average
53.6 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 432 hours spilling →
River Rawthey 51 432 down 23% 100%
Colne Waste Water Treatment Works
Storm tank at sewage works
Sewage works
Colne
Company site name
Colne WwTW
EA ID / permit
UUP00523 · 017160006
Outlet location
SD8703039470 (OS grid reference) · View on Apple Maps
WFD catchment
Colne Water - Trawden Bk to Wanless Water (GB112071065200)
2024 spills / hours
78 / 519
Long-term average
96.2 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 430 hours spilling →
Colne Water 64 430 down 18% 99%
Blind Lane CSO 02627
Overflow on sewer network
Company site name
Blind Lane CSO
EA ID / permit
UUP00261 · 017580238
Outlet location
NY0083014640 (OS grid reference) · View on Apple Maps
WFD catchment
Keekle (lower) (GB112074070000)
2024 spills / hours
50 / 352
Long-term average
43.3 spills a year (monitored since 2018)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 427 hours spilling →
River Keekle 44 427 down 12% 100%
Elterwater Pumping Station
Storm discharge at pumping station
Company site name
Elterwater pumping station (ELTER) (LAK0025)
EA ID / permit
UUP00702 · 01LAK0025
Outlet location
NY3305204510 (OS grid reference) · View on Apple Maps
WFD catchment
Great Langdale Beck (GB112073071120)
2024 spills / hours
32 / 292
Long-term average
39.9 spills a year (monitored since 2019)
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 423 hours spilling →
Great Langdale Beck 36 423 up 13% 100%
Coppull New Rd/Butterworth Rd CSO
Overflow on sewer network
Company site name
Coppull New Road/Butterworth Brow CSO
EA ID / permit
UUP00539 · 017081147
Outlet location
SD5685015931 (OS grid reference) · View on Apple Maps
WFD catchment
Yarrow DS Big Lodge Water (GB112070064952)
2024 spills / hours
106 / 341
Long-term average
103.7 spills a year (monitored since 2018)
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 421 hours spilling →
River Yarrow 83 421 down 22% 100%
Brookside CSO
Overflow on sewer network
Company site name
Brookside CSO
EA ID / permit
UUP00348 · 017580239
Outlet location
NY0211013960 (OS grid reference) · View on Apple Maps
WFD catchment
Ehen (upper including Liza) (GB112074070010)
2024 spills / hours
80 / 343
Long-term average
83.6 spills a year (monitored since 2021)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 420 hours spilling →
River Ehen 92 420 up 15% 100%
Great Broughton WwTW
Inlet overflow at sewage works
Sewage works
Great Broughton
Company site name
GREAT BROUGHTON WwTW
EA ID / permit
UUP00838 · 017570041
Outlet location
NY0706030500 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent - conf Cocker to tidal (GB112075070520)
2024 spills / hours
78 / 362
Long-term average
180.7 spills a year (monitored since 2019)
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 417 hours spilling →
River Derwent 85 417 up 9% 99%
Stirk House Hotel Wwps
Storm discharge at pumping station
Company site name
Stirk House Hotel PS
EA ID / permit
UUP01858 · 017160134
Outlet location
SD8154048370 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble DS Stock Beck (GB112071065612)
2024 spills / hours
79 / 735
Long-term average
52.5 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 416 hours spilling →
Wheatley Beck, Trib R. Ribble 46 416 down 42% 99%
Rochdale Rd / Burgin Walk CSO
Overflow on sewer network
Company site name
Rochdale Road/Collyhurst CSO
EA ID / permit
UUP01672 · 016993740
Outlet location
SD8533000020 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
112 / 541
Long-term average
71.4 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 415 hours spilling →
The River Irk 92 415 down 18% 100%
Low Marple WwTW
Storm tank at sewage works
Sewage works
Low Marple
Company site name
LOW MARPLE WwTW
EA ID / permit
UUP01197 · 016940178
Outlet location
SJ9608090500 (OS grid reference) · View on Apple Maps
WFD catchment
Etherow (Glossop Brook to Goyt) (GB112069061050)
2024 spills / hours
67 / 524
Long-term average
75.2 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 414 hours spilling →
River Etherow 72 414 up 7% 98%
Church Road
Storm discharge at pumping station
Company site name
Urmston Sewerage, Church Road & Carrington Road PS
EA ID / permit
UUP00481 · 01TRA0025
Outlet location
SJ7483093740 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
40 / 135
Long-term average
58.0 spills a year (monitored since 2024)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 414 hours spilling →
River Mersey 76 414 up 90% 82%
St Michaels Road/Manor Road CSO
Overflow on sewer network
Company site name
St Michaels Road/Manor Road CSO
EA ID / permit
UUP01827 · 01SEF0013
Outlet location
SD2955001655 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY MOUTH - transitional (GB641211630001)
Bathing water
Formby
Shellfish water
North Wirral (East)
2024 spills / hours
120 / 650
Long-term average
104.5 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Installation set-up/design issue · Resolved - Sep
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 413 hours spilling →
River Alt (tidal) 80 413 down 33% 80%
Grasmere WwTW
Inlet overflow at sewage works
Sewage works
Grasmere
Company site name
Grasmere Waste Water Treatment Works
EA ID / permit
UUP00829 · 017370027
Outlet location
NY3392006840 (OS grid reference) · View on Apple Maps
WFD catchment
Rothay (GB112073071140)
2024 spills / hours
115 / 1,248
Long-term average
83.7 spills a year (monitored since 2019)
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 408 hours spilling →
Grasmere Lake 53 408 down 54% 96%
North Wirral WwTW
Inlet overflow at sewage works
Sewage works
North Wirral
Company site name
North Wirral WwTW (Meols)
EA ID / permit
UUP01409 · 016993400
Outlet location
SJ2150095300 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey Mouth _ Coastal (GB641211630001)
Bathing water
Meols
2024 spills / hours
21 / 160
Long-term average
73.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 406 hours spilling →
Liverpool Bay 27 406 up 29% 99%
Mayfield Drive PS1 CSO 512EZ
Overflow on sewer network
Company site name
Mayfield Drive PS1 CSO (512EZ)
EA ID / permit
UUP01266 · 01WIR0108
Outlet location
SJ3650081801 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
108 / 611
Long-term average
60.8 spills a year (monitored since 2018)
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 403 hours spilling →
River Mersey Estuary 79 403 down 27% 100%
Leyland Waste Water Treatment Works
Storm tank at sewage works
Sewage works
Leyland
Company site name
LEYLAND WwTW
EA ID / permit
UUP01138 · 017060018
Outlet location
SD5215020870 (OS grid reference) · View on Apple Maps
WFD catchment
Lostock DS Farington Weir (GB112070064912)
2024 spills / hours
89 / 578
Long-term average
49.8 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 399 hours spilling →
River Lostock 56 399 down 37% 100%
Church Lane Crewe CSO
Overflow on sewer network
Company site name
CHURCH LANE CSO (Crewe)
EA ID / permit
UUP00480 · 01CRE0043
Outlet location
SJ6850054290 (OS grid reference) · View on Apple Maps
WFD catchment
Wistaston Brook (GB112068055280)
2024 spills / hours
103 / 754
Long-term average
86.5 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 397 hours spilling →
Wistaton Brook 64 397 down 38% 95%
Ellesmere Port WwTW
Storm tank at sewage works
Sewage works
Ellesmere Port
Company site name
ELLESMERE PORT WwTW
EA ID / permit
UUP00698 · 016810030
Outlet location
SJ4320074650 (OS grid reference) · View on Apple Maps
WFD catchment
Gowy (Milton Brook to Mersey) (GB112068060250)
2024 spills / hours
91 / 885
Long-term average
94.5 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 393 hours spilling →
Thornton Brook/River Gowy 54 393 down 41% 100%
Lomax Street CSO
Overflow on sewer network
Company site name
Lomax Street combined sewer overflow (099AA) (BRY0033)
EA ID / permit
UUP01168 · 016993829
Outlet location
SD7845006660 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Roch to Croal) (GB112069060840)
2024 spills / hours
121 / 501
Long-term average
97.9 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 392 hours spilling →
The River Irwell 90 392 down 26% 100%
Maryport Sewage Pumping Station
Storm discharge at pumping station
Company site name
Maryport Sewage PS
EA ID / permit
UUP01260 · 017580242
Outlet location
NY0194036360 (OS grid reference) · View on Apple Maps
WFD catchment
Solway Outer South (GB641211630003)
Bathing water
Allonby
2024 spills / hours
19 / 153
Long-term average
30.5 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 385 hours spilling →
The Irish Sea 35 385 up 84% 100%
Newton Arlosh WwTW Newta
Inlet overflow at sewage works
Sewage works
Newton Arlosh Newta
Company site name
NEWTON ARLOSH WwTW
EA ID / permit
UUP01398 · 017570196
Outlet location
NY1909055590 (OS grid reference) · View on Apple Maps
WFD catchment
SOLWAY (GB530207614700)
2024 spills / hours
93 / 437
Long-term average
117.9 spills a year (monitored since 2019)
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 385 hours spilling →
Trib of River Wampool 81 385 down 13% 100%
Stretford WwTW
Storm tank at sewage works
Sewage works
Stretford
Company site name
STRETFORD WwTW
EA ID / permit
UUP01884 · 016940152
Outlet location
SJ7806093180 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
45 / 334
Long-term average
56.8 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 383 hours spilling →
River Mersey 31 383 down 31% 100%
Sharples Street CSO
Overflow on sewer network
EA ID / permit
UUP01746 · 01BBN0038
Outlet location
SD6795027160 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - conf Davy Field Bk to conf Blakewater (GB112071065270)
2024 spills / hours
184 / 515
Long-term average
196.0 spills a year (monitored since 2021)
High-spill reason (company)
Performance - Asset configuration (e.g. PS/rising main/storm tanks)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 381 hours spilling →
Tributary of River Darwen 145 381 down 21% 98%
Newton Reigny Pumping Station
Storm discharge at pumping station
Company site name
Newton Reigny PS
EA ID / permit
UUP01399 · NPSWQD002805
Outlet location
NY4791031890 (OS grid reference) · View on Apple Maps
WFD catchment
Petteril u/s M6 (GB102076073992)
2024 spills / hours
55 / 463
Long-term average
47.6 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 380 hours spilling →
River Petteril 50 380 down 9% 100%
Temple Sowerby WwTW
Inlet overflow at sewage works
Sewage works
Temple Sowerby
Company site name
TEMPLE SOWERBY WwTW
EA ID / permit
UUP01906 · 017670042
Outlet location
NY6106027880 (OS grid reference) · View on Apple Maps
WFD catchment
Crowdundle Beck - Lower (GB102076070950)
2024 spills / hours
184 / 1,258
Long-term average
192.7 spills a year (monitored since 2020)
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 380 hours spilling →
Birk Syke 123 380 down 33% 100%
Bridge End Ind Estate PS
Storm discharge at pumping station
Company site name
Bridge End Ind Estate PS
EA ID / permit
UUP00312 · 017480460
Outlet location
NY0123310014 (OS grid reference) · View on Apple Maps
WFD catchment
Ehen (lower) (GB112074069980)
Bathing water
Seascale
2024 spills / hours
31 / 134
Long-term average
40.3 spills a year (monitored since 2018)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 380 hours spilling →
River Ehen 44 380 up 42% 96%
Kenlis Pumping Station
Storm discharge at pumping station
Company site name
Kenlis PS
EA ID / permit
UUP01055 · 017260145
Outlet location
SD5079043860 (OS grid reference) · View on Apple Maps
WFD catchment
Calder (Wyre) (GB112072066220)
2024 spills / hours
80 / 439
Long-term average
77.0 spills a year (monitored since 2021)
High-spill reason (company)
Data collection - EDM non-representative location
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 379 hours spilling →
Little Calder 64 379 down 20% 97%
Kendal Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Kendal
Company site name
KENDAL WwTW
EA ID / permit
UUP01053 · 017370100
Outlet location
SD5170090790 (OS grid reference) · View on Apple Maps
WFD catchment
Kent - conf Sprint to tidal (GB112073071460)
2024 spills / hours
74 / 268
Long-term average
56.5 spills a year (monitored since 2022)
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 378 hours spilling →
The River Kent 73 378 down 1% 100%
Tbc
Inlet overflow at sewage works
Sewage works
Tbc
Company site name
Calverley WwTW SO
EA ID / permit
UUP02288 · Unpermitted
Outlet location
SJ5933158729 (OS grid reference) · View on Apple Maps
WFD catchment
Gowy and tribs (Source to Milton Brook) (GB112068060280)
2024 spills / hours
– / –
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 377 hours spilling →
Trib of River Gowy 62 377 100%
Strines WwTW
Storm tank at sewage works
Sewage works
Strines
Company site name
STRINES WwTW
EA ID / permit
UUP01885 · 016940182
Outlet location
SJ9701187101 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Sett to Etherow) (GB112069060960)
2024 spills / hours
104 / 1,051
Long-term average
112.7 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 376 hours spilling →
River Goyt 65 376 down 38% 99%
Moorfiled Hall CSO 432G4
Overflow on sewer network
Company site name
Moorfield Hall CSO
EA ID / permit
UUP01338 · 016982981
Outlet location
SJ8845083800 (OS grid reference) · View on Apple Maps
WFD catchment
Dean (Bollington to Bollin) (GB112069061360)
2024 spills / hours
45 / 202
Long-term average
41.1 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 375 hours spilling →
Trib Spath Brook 53 375 up 18% 99%
Macclesfield WwTW
Storm tank at sewage works
Sewage works
Macclesfield
Company site name
MACCLESFIELD WwTW
EA ID / permit
UUP01218 · 016910009
Outlet location
SJ8961078200 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (Source to Dean) (GB112069061320)
2024 spills / hours
140 / 1,852
Long-term average
119.6 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 374 hours spilling →
River Bollin 56 374 down 60% 99%
Blindcrake WwTW
Storm tank at sewage works
Sewage works
Blindcrake
Company site name
Blindcrake Wastewater Treatment Works (BLIND) (017570023)
EA ID / permit
UUP00262 · 017570023
Outlet location
NY1494034380 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent DS Bassenthwaite Lake (GB112075073562)
2024 spills / hours
54 / 367
Long-term average
80.6 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 373 hours spilling →
Gill Beck 47 373 down 13% 94%
Ridding Lane CSO (342X5)
Overflow on sewer network
Company site name
Ridding Lane Combined Sewage Overflow
EA ID / permit
UUP01655 · 017160332
Outlet location
SD7235036310 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
112 / 587
Long-term average
86.4 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 373 hours spilling →
River Calder 50 373 down 55% 79%
Wilpshire WwTW
Storm tank at sewage works
Sewage works
Wilpshire
Company site name
WILPSHIRE WwTW
EA ID / permit
UUP02139 · 017160049
Outlet location
SD6755032440 (OS grid reference) · View on Apple Maps
WFD catchment
Showley Brook (GB112071065710)
2024 spills / hours
92 / 476
Long-term average
102.2 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 372 hours spilling →
Showley Brook 69 372 down 25% 100%
Preston Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Preston
Company site name
PRESTON WwTW
EA ID / permit
UUP01574 · 017160064
Outlet location
SD4571027930 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE _ Transitional (GB531207112400)
Bathing water
Southport; St Annes; St. Annes North; Blackpool South
Shellfish water
Ribble
2024 spills / hours
44 / 544
Long-term average
64.8 spills a year (monitored since 2017)
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 372 hours spilling →
River Ribble Estuary 43 372 down 2% 100%
Oldham WwTW
Storm tank at sewage works
Sewage works
Oldham
Company site name
OLDHAM WwTW
EA ID / permit
UUP01461 · 016950038
Outlet location
SD8937004430 (OS grid reference) · View on Apple Maps
WFD catchment
Wince Brook (GB112069061120)
2024 spills / hours
41 / 461
Long-term average
19.8 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 369 hours spilling →
Wince Brook 38 369 down 7% 100%
Great Asby WwTW
Inlet overflow at sewage works
Sewage works
Great Asby
Company site name
GREAT ASBY WwTW
EA ID / permit
UUP00834 · 017680364
Outlet location
NY6859013710 (OS grid reference) · View on Apple Maps
WFD catchment
Hoff Beck (upper) (GB102076070630)
2024 spills / hours
69 / 383
Long-term average
116.5 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 369 hours spilling →
Asby Beck 60 369 down 13% 100%
Wray Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Wray
Company site name
Wray Wastewater Treatment Works (WRAYZ) (017270020)
EA ID / permit
UUP02179 · 017270020
Outlet location
SD6011068120 (OS grid reference) · View on Apple Maps
WFD catchment
Hindburn (GB112072066050)
2024 spills / hours
39 / 91
Long-term average
176.6 spills a year (monitored since 2019)
High-spill reason (company)
Data collection - EDM non-representative location
Investigation
Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 368 hours spilling →
River Hindburn 90 368 up 131% 100%
Ravenglass WwTW
Storm tank at sewage works
Sewage works
Ravenglass
Company site name
RAVENGLASS WwTW
EA ID / permit
UUP01613 · 017470074
Outlet location
SD0853096020 (OS grid reference) · View on Apple Maps
WFD catchment
ESK - transitional (GB531207408400)
2024 spills / hours
49 / 697
Long-term average
77.3 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 366 hours spilling →
River Esk Estuary 27 366 down 45% 100%
Eccles WwTW (Eccl)
Inlet overflow at sewage works
Sewage works
Eccles
Company site name
ECCLES WwTW
EA ID / permit
UUP00683 · 016940144
Outlet location
SJ7496097150 (OS grid reference) · View on Apple Maps
WFD catchment
Folly Brook and Salteye Brook (GB112069061430)
2024 spills / hours
129 / 736
Long-term average
100.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Installation set-up/design issue · Resolved - Mar
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 363 hours spilling →
Salteye Brook 75 363 down 42% 82%

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.