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
Cleator WwTW
Storm tank at sewage works
Sewage works
Cleator
Company site name
CLEATOR WwTW
EA ID / permit
UUP00497 · 017470025
Outlet location
NY0129013190 (OS grid reference) · View on Apple Maps
WFD catchment
Keekle (lower) (GB112074070000)
Bathing water
Seascale
2024 spills / hours
62 / 885
Long-term average
79.3 spills a year (monitored since 2017)
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 1,200 hours spilling →
River Keekle 71 1,200 up 15% 99%
Fitz Bridge (Low Road) CSO
Overflow on sewer network
Company site name
Fitz Bridge (Low Road) CSO
EA ID / permit
UUP00741 · 017571047
Outlet location
NY1068030860 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent - conf Cocker to tidal (GB112075070520)
2024 spills / hours
99 / 959
Long-term average
107.6 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 1,178 hours spilling →
River Derwent 106 1,178 up 7% 100%
Millom Wastewater Treatment Works
Storm tank at sewage works (with treatment)
Sewage works
Millom
Company site name
MILLOM WwTW
EA ID / permit
UUP01322 · 017470048
Outlet location
SD1922079410 (OS grid reference) · View on Apple Maps
WFD catchment
Duddon Sands (GB641211172000)
Bathing water
Haverigg; Walney Biggar Bank; Walney West Shore; Walney Sandy Gap
Treatment
UV (Ultraviolet)
2024 spills / hours
117 / 1,527
Long-term average
88.3 spills a year (monitored since 2018)
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 1,177 hours spilling →
Duddon Estuary 92 1,177 down 21% 98%
Orton STW
Storm tank at sewage works
Sewage works
Orton
Company site name
ORTON WwTW
EA ID / permit
UUP01479 · 017270008
Outlet location
NY6291007680 (OS grid reference) · View on Apple Maps
WFD catchment
Chapel Beck (GB112072071800)
2024 spills / hours
155 / 2,902
Long-term average
133.8 spills a year (monitored since 2021)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 1,149 hours spilling →
Chapel Beck 75 1,149 down 52% 100%
Braithwaite Ww Pumping Station
Storm discharge at pumping station
Company site name
Braithwaite Ww PS
EA ID / permit
UUP00301 · 01ALL0056
Outlet location
NY2365024400 (OS grid reference) · View on Apple Maps
WFD catchment
Newlands Beck (GB112075070440)
2024 spills / hours
114 / 1,044
Long-term average
114.9 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
Operational improvement completed
Volume & pollution
Estimate from 1,132 hours spilling →
Hallgarth Beck 114 1,132 no change 100%
Braystones WwTW
Inlet overflow at sewage works
Sewage works
Braystones
Company site name
BRAYSTONES WwTW
EA ID / permit
UUP00306 · 017470152
Outlet location
NY0076005070 (OS grid reference) · View on Apple Maps
WFD catchment
Ehen (lower) (GB112074069980)
Bathing water
Seascale
2024 spills / hours
163 / 511
Long-term average
164.4 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 1,082 hours spilling →
Irish Sea 168 1,082 up 3% 100%
Askam-in-Furness WwTW Askam
Storm tank at sewage works
Sewage works
Askam In Furness Askam
Company site name
ASKAM-IN-FURNESS WwTW
EA ID / permit
UUP00149 · 017470136
Outlet location
SD2118078600 (OS grid reference) · View on Apple Maps
WFD catchment
Duddon Sands (GB641211172000)
Bathing water
Haverigg; Walney Biggar Bank; Walney West Shore; Walney Sandy Gap
Shellfish water
Duddon; Walney
2024 spills / hours
110 / 1,783
Long-term average
147.8 spills a year (monitored since 2017)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
No investigation activity in reporting period
Improvement
Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 1,066 hours spilling →
Blea Beck 65 1,066 down 41% 100%
Fletchertown STW
Storm tank at sewage works
Sewage works
Fletchertown
Company site name
FLETCHERTOWN WwTW
EA ID / permit
UUP00746 · 017570014
Outlet location
NY2125043500 (OS grid reference) · View on Apple Maps
WFD catchment
Crummock Beck u/s Holme Dub (GB102075073480)
2024 spills / hours
148 / 913
Long-term average
185.0 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 1,045 hours spilling →
Crummock Beck 133 1,045 down 10% 91%
Heversham Sewage Pumping Station
Storm discharge at pumping station
Company site name
Heversham Sewage PS
EA ID / permit
UUP00946 · 01LAK0055
Outlet location
SD4864083090 (OS grid reference) · View on Apple Maps
WFD catchment
Bela (GB112073071070)
2024 spills / hours
93 / 1,456
Long-term average
80.5 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 1,038 hours spilling →
Marsh Drain 57 1,038 down 39% 100%
Hayfield Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Hayfield
Company site name
HAYFIELD WwTW
EA ID / permit
UUP00925 · 016940174
Outlet location
SK0266087140 (OS grid reference) · View on Apple Maps
WFD catchment
Sett (GB112069060970)
2024 spills / hours
72 / 1,001
Long-term average
92.8 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 1,028 hours spilling →
River Sett 59 1,028 down 18% 100%
Little Salkeld WwTW
Inlet overflow at sewage works
Sewage works
Little Salkeld
Company site name
LITTLE SALKELD WwTW
EA ID / permit
UUP01155 · 017680290
Outlet location
NY5617036670 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - Eamont to tidal (GB102076073940)
2024 spills / hours
101 / 612
Long-term average
158.2 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1,014 hours spilling →
Trib River Eden 118 1,014 up 17% 97%
Whalley Wastewater Treament Works
Storm tank at sewage works
Sewage works
Whalley Wastewater Treament Works
Company site name
WHALLEY WwTW
EA ID / permit
UUP02103 · 017180634
Outlet location
SD7200036400 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
114 / 1,326
Long-term average
107.8 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 1,006 hours spilling →
The River Calder 91 1,006 down 20% 100%
Ambleside WwTW
Storm tank at sewage works
Sewage works
Ambleside
Company site name
AMBLESIDE WwTW
EA ID / permit
UUP00114 · 017370024
Outlet location
NY3711004150 (OS grid reference) · View on Apple Maps
WFD catchment
Rothay (GB112073071140)
Bathing water
Windermere; Rayrigg Meadow; Windermere; Millerground Landing
2024 spills / hours
43 / 496
Long-term average
61.6 spills a year (monitored since 2024)
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 983 hours spilling →
River Rothay 55 983 up 28% 100%
Whitemore Pumping Station
Storm discharge at pumping station
Company site name
Whitemore PS
EA ID / permit
UUP02118 · 016881659
Outlet location
SJ8855061170 (OS grid reference) · View on Apple Maps
WFD catchment
Biddulph Brook (GB112068055360)
2024 spills / hours
108 / 1,146
Long-term average
64.3 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
Operational improvement completed
Volume & pollution
Estimate from 974 hours spilling →
Biddulph Brook, Trib Rvr Dane 73 974 down 32% 100%
Withnell Fold Network Pumping Stati
Storm discharge at pumping station
Company site name
Withnell Fold PS
EA ID / permit
UUP02155 · 01CHR0065
Outlet location
SD6130023570 (OS grid reference) · View on Apple Maps
WFD catchment
Lostock US Farington Weir (GB112070064911)
2024 spills / hours
160 / 2,011
Long-term average
141.2 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, Operational improvement completed
Volume & pollution
Estimate from 961 hours spilling →
Kyln Clough, Trib of R Lostock 88 961 down 45% 100%
Beam Bridge Pumping Station
Storm discharge at pumping station
Company site name
Beam Bridge PS
EA ID / permit
UUP00207 · 016810192
Outlet location
SJ6515053560 (OS grid reference) · View on Apple Maps
WFD catchment
Weaver (Barnett to Valley Brook) (GB112068060461)
2024 spills / hours
121 / 1,696
Long-term average
100.5 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
Operational improvement completed
Volume & pollution
Estimate from 959 hours spilling →
River Weaver 78 959 down 36% 100%
Formby Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Formby
Company site name
FORMBY WwTW
EA ID / permit
UUP00753 · 016930108
Outlet location
SD2971005900 (OS grid reference) · View on Apple Maps
WFD catchment
Alt DS Bull Bridge (GB112069061442)
Bathing water
Formby
Shellfish water
Ribble
2024 spills / hours
80 / 681
Long-term average
89.9 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 952 hours spilling →
River Alt 75 952 down 6% 100%
Whaley Bridge WwTW
Inlet overflow at sewage works
Sewage works
Whaley Bridge
Company site name
WHALEY BRIDGE WwTW
EA ID / permit
UUP02097 · 016940184
Outlet location
SK0125083220 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Randall Carr Brook to Sett). (GB112069060880)
2024 spills / hours
53 / 852
Long-term average
66.3 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 940 hours spilling →
River Goyt 53 940 no change 99%
Kendal Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Kendal
Company site name
KENDAL WwTW
EA ID / permit
UUP01052 · 017370100
Outlet location
SD5170090790 (OS grid reference) · View on Apple Maps
WFD catchment
Kent - conf Sprint to tidal (GB112073071460)
2024 spills / hours
73 / 656
Long-term average
60.8 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 929 hours spilling →
The River Kent 81 929 up 11% 100%
Mere Brow WwTW
Storm tank at sewage works
Sewage works
Mere Brow
Company site name
MERE BROW WwTW
EA ID / permit
UUP01284 · 017030002
Outlet location
SD4240018870 (OS grid reference) · View on Apple Maps
WFD catchment
Back Drain and Sluice (GB112070064880)
Bathing water
St Annes
Shellfish water
Ribble
2024 spills / hours
123 / 1,283
Long-term average
100.6 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 916 hours spilling →
Tarleton Runner, tributary of The Sluice 93 916 down 24% 96%
Alderley Edge WwTW Aldye
Storm tank at sewage works
Sewage works
Alderley Edge Aldye
Company site name
ALDERLEY EDGE WwTW
EA ID / permit
UUP00098 · 016910001
Outlet location
SJ8283078580 (OS grid reference) · View on Apple Maps
WFD catchment
Mobberley Brook (GB112069061330)
2024 spills / hours
110 / 1,080
Long-term average
133.6 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 908 hours spilling →
Whitehall Brook 91 908 down 17% 100%
St Bees Pumping Station
Overflow on sewer network
Company site name
St Bees PS
EA ID / permit
UUP01813 · 017480322
Outlet location
NX9690011400 (OS grid reference) · View on Apple Maps
WFD catchment
Pow Beck (South West Lakes) (GB112074069990)
Bathing water
St Bees
2024 spills / hours
47 / 462
Long-term average
49.9 spills a year (monitored since 2018)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 907 hours spilling →
Pow Beck 64 907 up 36% 100%
Keswick STW
Storm tank at sewage works
Sewage works
Keswick
Company site name
KESWICK WwTW
EA ID / permit
UUP01060 · 017570044
Outlet location
NY2487224952 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent US Bassenthwaite Lake (GB112075073561)
2024 spills / hours
78 / 796
Long-term average
80.4 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 907 hours spilling →
River Derwent 77 907 down 1% 99%
Barrow-in-Furness WwTW
Storm tank at sewage works
Sewage works
Barrow In Furness
Company site name
Barrow-in-Furness Wastewater Treatment Works (BARFU) (017470166)
EA ID / permit
UUP00195 · 017470166
Outlet location
SD2200068190 (OS grid reference) · View on Apple Maps
WFD catchment
Morecambe Bay - Coastal (GB641211171000)
Bathing water
Walney Biggar Bank; Walney West Shore; Walney Sandy Gap
Shellfish water
Walney; Roosebeck
2024 spills / hours
95 / 1,103
Long-term average
74.0 spills a year (monitored since 2018)
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 899 hours spilling →
Walney Channel (estuarine waters) 64 899 down 33% 100%
Gilcrux WwTW Gilcr
Storm tank at sewage works
Sewage works
Gilcrux Gilcr
Company site name
GILCRUX WwTW
EA ID / permit
UUP00788 · 017570069
Outlet location
NY1110038360 (OS grid reference) · View on Apple Maps
WFD catchment
Ellen (lower) (GB112075073640)
Bathing water
Allonby
2024 spills / hours
129 / 1,988
Long-term average
166.8 spills a year (monitored since 2017)
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 876 hours spilling →
Bullclose Beck 106 876 down 18% 100%
Torrs Diversion CSO 21123
Overflow on sewer network
Company site name
Torrs Diversion Sewer CSO
EA ID / permit
UUP01953 · 01PEA0023
Outlet location
SK0011085271 (OS grid reference) · View on Apple Maps
WFD catchment
Sett (GB112069060970)
2024 spills / hours
98 / 602
Long-term average
112.6 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 870 hours spilling →
River Goyt Vis SWS 104 870 up 6% 100%
Saddleworth WwTW
Storm tank at sewage works
Sewage works
Saddleworth
Company site name
SADDLEWORTH WwTW
EA ID / permit
UUP01704 · 016940090
Outlet location
SD9926904207 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
65 / 797
Long-term average
109.2 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 869 hours spilling →
River Tame 53 869 down 18% 100%
Northside CSO 021QB
Overflow on sewer network
Company site name
Northside Sewerage System
EA ID / permit
UUP01410 · 017570206
Outlet location
NY0117029340 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent - conf Cocker to tidal (GB112075070520)
2024 spills / hours
80 / 264
Long-term average
68.9 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 849 hours spilling →
River Derwent 100 849 up 25% 100%
Mobberley WwTW
Storm tank at sewage works
Sewage works
Mobberley
Company site name
MOBBERLEY WwTW
EA ID / permit
UUP01332 · 016910010
Outlet location
SJ7834080290 (OS grid reference) · View on Apple Maps
WFD catchment
Mobberley Brook (GB112069061330)
2024 spills / hours
109 / 1,448
Long-term average
106.8 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 839 hours spilling →
Mobberley Brook 70 839 down 36% 100%
Caton Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Caton
Company site name
CATON WwTW
EA ID / permit
UUP00427 · 017270001
Outlet location
SD5277065250 (OS grid reference) · View on Apple Maps
WFD catchment
Lune - conf Wenning to tidal (GB112072065980)
2024 spills / hours
134 / 1,820
Long-term average
78.3 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 838 hours spilling →
River Lune 83 838 down 38% 100%
Calder Bridge WwTW
Inlet overflow at sewage works
Sewage works
Calder Bridge
Company site name
CALDER BRIDGE WwTW
EA ID / permit
UUP00390 · 017470034
Outlet location
NY0367004920 (OS grid reference) · View on Apple Maps
WFD catchment
Calder (Lower) (GB112074069730)
Bathing water
Seascale
2024 spills / hours
51 / 598
Long-term average
105.7 spills a year (monitored since 2017)
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 835 hours spilling →
River Calder 52 835 up 2% 100%
Town Lane CSO
Overflow on sewer network
Company site name
Town Lane CSO
EA ID / permit
UUP01957 · 016881767
Outlet location
SJ7891079820 (OS grid reference) · View on Apple Maps
WFD catchment
Mobberley Brook (GB112069061330)
2024 spills / hours
87 / 526
Long-term average
121.1 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 835 hours spilling →
Mobberley Brook Trib Rv Bollin 101 835 up 16% 90%
Hale Storm Tanks & Pumping Station
Storm discharge at pumping station
Company site name
Hale Storm Tanks and WwPPS
EA ID / permit
UUP00877 · 016940005
Outlet location
SJ7729085590 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (River Dean to Ashley Mill) (GB112069061381)
2024 spills / hours
62 / 942
Long-term average
60.8 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 835 hours spilling →
River Bollin 61 835 down 2% 100%
North Wirral WwTW
Inlet overflow at sewage works
Sewage works
North Wirral
Company site name
North Wirral WwTW (Meols)
EA ID / permit
UUP01408 · 016993400
Outlet location
SJ2401090280 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
2024 spills / hours
180 / 1,286
Long-term average
152.4 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 833 hours spilling →
River Birket 164 833 down 9% 100%
Low Wood Bridge Pumping Station
Storm discharge at pumping station
Company site name
Low Wood Bridge Pumping Station (Site ID LOWWO) (LAK0054)
EA ID / permit
UUP01198 · 017380340
Outlet location
SD3452183661 (OS grid reference) · View on Apple Maps
WFD catchment
Leven (GB112073071420)
Bathing water
Morecambe North
Shellfish water
Morecambe Bay (Leven)
2024 spills / hours
88 / 958
Long-term average
46.2 spills a year (monitored since 2017)
High-spill reason (company)
Performance - Asset configuration (e.g. PS/rising main/storm tanks)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 823 hours spilling →
River Leven 60 823 down 32% 100%
Naze Lane Pumping Station
Storm discharge at pumping station
Company site name
Naze Lane PS (19048)
EA ID / permit
UUP01367 · 017180397
Outlet location
SD4233027040 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE_Transitional (GB531207112400)
2024 spills / hours
119 / 1,078
Long-term average
107.0 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 803 hours spilling →
Pool Stream 77 803 down 35% 99%
West Newton Pumping Station
Storm discharge at pumping station
Company site name
Westnewton pumping station (Site ID WSTNE) (ALL0114)
EA ID / permit
UUP02092 · 017580265
Outlet location
NY1318043820 (OS grid reference) · View on Apple Maps
WFD catchment
Crookhurst Beck (GB112075073660)
Bathing water
Allonby
2024 spills / hours
100 / 1,622
Long-term average
81.8 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 799 hours spilling →
West Newton Beck 81 799 down 19% 100%
Picket How Farm SSO
Overflow on sewer network
Company site name
Pickett How Farm CSO
EA ID / permit
UUP01549 · 017470089
Outlet location
NY0117009690 (OS grid reference) · View on Apple Maps
WFD catchment
Ehen (lower) (GB112074069980)
Bathing water
St Bees
2024 spills / hours
18 / 144
Long-term average
15.1 spills a year (monitored since 2018)
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 776 hours spilling →
River Ehen 46 776 up 156% 100%
Bolton Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Bolton
Company site name
BOLTON WwTW
EA ID / permit
UUP00277 · 016950032
Outlet location
SD7655004690 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Croal to Irk) (GB112069061451)
2024 spills / hours
71 / 668
Long-term average
75.2 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 775 hours spilling →
River Irwell 61 775 down 14% 95%
Wallasey Ww Pumping Station
Storm discharge at pumping station
Company site name
Wallasey PS
EA ID / permit
UUP02010 · 016983300
Outlet location
SJ3262090640 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey; Moreton
2024 spills / hours
186 / 1,140
Long-term average
199.8 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 769 hours spilling →
River Mersey Estuary 164 769 down 12% 100%
Hayton Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Hayton
Company site name
HAYTON WwTW
EA ID / permit
UUP00927 · 017570084
Outlet location
NY1076041830 (OS grid reference) · View on Apple Maps
WFD catchment
Crookhurst Beck (GB112075073660)
Bathing water
Allonby
2024 spills / hours
106 / 818
Long-term average
114.8 spills a year (monitored since 2018)
High-spill reason (company)
Performance - SW Infiltration
Monitor below 90%
Sensor failure / issue · Resolved - January after reporting year
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 750 hours spilling →
Patten Beck 99 750 down 7% 69%
Harrisons Farm CSO (12067)
Overflow on sewer network
Company site name
Near Harrison's Farm CSO
EA ID / permit
UUP01417 · 01CHR0021
Outlet location
SD5987012400 (OS grid reference) · View on Apple Maps
WFD catchment
Douglas - Upper (GB112070064850)
2024 spills / hours
113 / 947
Long-term average
97.8 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 740 hours spilling →
River Douglas 63 740 down 44% 100%
Audley Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Audley
Company site name
AUDLEY WwTW
EA ID / permit
UUP00159 · 016810045
Outlet location
SJ7953051750 (OS grid reference) · View on Apple Maps
WFD catchment
Valley Brook (Source to Englesea Brook) (GB112068074630)
2024 spills / hours
66 / 746
Long-term average
74.1 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 737 hours spilling →
Audley Brook 62 737 down 6% 100%
Garstang STW
Storm tank at sewage works
Sewage works
Garstang
Company site name
GARSTANG WwTW
EA ID / permit
UUP00777 · 017260046
Outlet location
SD4788042750 (OS grid reference) · View on Apple Maps
WFD catchment
Wyre DS Grizedale Brook confl (GB112072065822)
Bathing water
Fleetwood
2024 spills / hours
87 / 1,470
Long-term average
85.8 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 733 hours spilling →
River Wyre 53 733 down 39% 100%
Otterspool Road CSO
Overflow on sewer network
Company site name
Otterspool Road Combined Sewer Overflow
EA ID / permit
UUP01482 · 016993555
Outlet location
SJ9365089600 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Etherow to Mersey) (GB112069061000)
2024 spills / hours
148 / 1,114
Long-term average
143.6 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 729 hours spilling →
The River Goyt 117 729 down 21% 99%
Westhoughton WTW
Storm tank at sewage works
Sewage works
Westhoughton
Company site name
WESTHOUGHTON WwTW
EA ID / permit
UUP02085 · 016950136
Outlet location
SD6500003660 (OS grid reference) · View on Apple Maps
WFD catchment
Westleigh Brook (GB112069060820)
2024 spills / hours
122 / 1,220
Long-term average
121.5 spills a year (monitored since 2020)
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 729 hours spilling →
Trib of Hall Lee Brook 86 729 down 30% 100%
Dock Road South CSO
Storm discharge at pumping station
Company site name
Dock Road South PS, Bromborough
EA ID / permit
UUP00644 · 016810665
Outlet location
SJ3541084410 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
2024 spills / hours
137 / 1,424
Long-term average
108.4 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 727 hours spilling →
Mersey Estuary 86 727 down 37% 100%
High Newton STW
Inlet overflow at sewage works
Sewage works
High Newton
Company site name
High Newton WwTW
EA ID / permit
UUP02264 · Unpermitted
Outlet location
SD3988082900 (OS grid reference) · View on Apple Maps
WFD catchment
Eea (GB112073071270)
2024 spills / hours
164 / 1,341
Long-term average
137.5 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 720 hours spilling →
Trib Ayside Pool 111 720 down 32% 99%
Papcastle Pumping Station (ALL0139)
Storm discharge at pumping station
Company site name
Papcastle Pumping Station
EA ID / permit
UUP01505 · EPRJB3597VV
Outlet location
NY1035931293 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent - conf Cocker to tidal (GB112075070520)
2024 spills / hours
104 / 1,284
Long-term average
64.3 spills a year (monitored since 2021)
High-spill reason (company)
Performance - Pump failure / issue
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 711 hours spilling →
River Derwent 85 711 down 18% 100%
Wilmslow Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Wilmslow
Company site name
WILMSLOW WwTW
EA ID / permit
UUP02137 · 016910014
Outlet location
SJ8413082320 (OS grid reference) · View on Apple Maps
WFD catchment
Dean (Bollington to Bollin) (GB112069061360)
2024 spills / hours
108 / 1,407
Long-term average
123.7 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 703 hours spilling →
River Dean 71 703 down 34% 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.