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
Wigan Cemetery Combined Sewer Ov
Overflow on sewer network
Company site name
Wigan Cemetry CSO
EA ID / permit
UUP02126 · 017081356
Outlet location
SD5873004030 (OS grid reference) · View on Apple Maps
WFD catchment
Poolstock Brook (GB112070061610)
2024 spills / hours
3 / 1.8
Long-term average
2.2 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.5 hours spilling →
Ince Brook 2 3.5 down 33% 100%
Bolton Road/Astley Street CSO
Overflow on sewer network
Company site name
Bolton Road/ Astley Street CSO
EA ID / permit
UUP00274 · 017190911
Outlet location
SD6950021290 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - headwaters to conf Davy Field Bk (GB112071065240)
2024 spills / hours
13 / 6.3
Long-term average
12.8 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.5 hours spilling →
Kebbs Brook,Trib of Riv Darwen 9 3.5 down 31% 100%
Pilling Lane PS
Storm discharge at pumping station
Company site name
Pilling Lane Pumping Station (Site ID PILLL) (WYR0073)
EA ID / permit
UUP01550 · 017290557
Outlet location
SD3607048950 (OS grid reference) · View on Apple Maps
WFD catchment
Morecambe Bay (GB641211171000)
Bathing water
Fleetwood; Morecambe South
2024 spills / hours
6 / 0.7
Long-term average
15.9 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.4 hours spilling →
River Wyre Estuary 6 3.4 no change 100%
Burnley Rd E /Whitewell Bottom CSO
Overflow on sewer network
Company site name
Burnley Road East/Whitewall Bottom CSO
EA ID / permit
UUP00372 · 016993743
Outlet location
SD8349023870 (OS grid reference) · View on Apple Maps
WFD catchment
Whitewell Brook (GB112069064670)
2024 spills / hours
3 / 9.1
Long-term average
2.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.4 hours spilling →
Whitewell Brook 3 3.4 no change 100%
Hankinson Way CSO
Overflow on sewer network
Company site name
Hankinson Way CSO
EA ID / permit
UUP00894 · 016982903
Outlet location
SJ7961097700 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
10 / 32
Long-term average
8.8 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.4 hours spilling →
Manchester Ship Canal via SWS 5 3.4 down 50% 94%
School Lane CSO 192QK
Overflow on sewer network
Company site name
School Lane CSO
EA ID / permit
UUP01727 · 017160084
Outlet location
SD4300032460 (OS grid reference) · View on Apple Maps
WFD catchment
Dow Brook (GB112071065670)
Bathing water
St Annes
2024 spills / hours
9 / 0.9
Long-term average
20.1 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.4 hours spilling →
Carr Brook 7 3.4 down 22% 100%
Dibbs Lane CSO 381RT
Overflow on sewer network
Company site name
Dibbs Lane CSO
EA ID / permit
UUP00638 · 016982649
Outlet location
SD2955001650 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY MOUTH - transitional (GB641211630001)
2024 spills / hours
8 / 3.8
Long-term average
10.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.3 hours spilling →
Mersey Estuary 9 3.3 up 13% 97%
Blackfriars Street CSO 283J1
Overflow on sewer network
Company site name
BLACKFRIARS STREET CSO
EA ID / permit
UUP00251 · 01MAN0156
Outlet location
SJ8368098590 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
14 / 3.5
Long-term average
20.8 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.3 hours spilling →
River Irwell 20 3.3 up 43% 100%
St Nicholas Storm Sewer Overflow
Overflow on sewer network
Company site name
St. Nicholas Storm Sewer overflow
EA ID / permit
UUP01830 · 016930973
Outlet location
SJ3370090400 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
17 / 4.8
Long-term average
13.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.3 hours spilling →
Mersey Estuary 7 3.3 down 59% 100%
Mather Ave Albert Ave CSO
Overflow on sewer network
Company site name
Mather Avenue/Albert Avenue CSO
EA ID / permit
UUP01261 · 016950319
Outlet location
SD8218002340 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Croal to Irk) (GB112069061451)
2024 spills / hours
14 / 8.0
Long-term average
14.1 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.3 hours spilling →
Singleton Brook Trib R Irwell 7 3.3 down 50% 100%
Warrington/Grappenhall
Overflow on sewer network
Company site name
Grappenhall Resewerage Scheme
EA ID / permit
UUP02030 · 016921094
Outlet location
SJ6295087000 (OS grid reference) · View on Apple Maps
WFD catchment
Manchester Ship Canal (GB71210004)
2024 spills / hours
0 / 0.0
Long-term average
0.5 spills a year (monitored since 2024)
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 3.3 hours spilling →
Manchester Ship Canal 1 3.3 up from 0 62%
Mainwayeast/Lincoln Road CSO
Overflow on sewer network
Company site name
Mainway/Lincoln Road Combined Sewer Overflow
EA ID / permit
UUP01222 · 01ROC0015
Outlet location
SD8810004590 (OS grid reference) · View on Apple Maps
WFD catchment
Wince Brook (GB112069061120)
2024 spills / hours
16 / 15
Long-term average
10.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.3 hours spilling →
Wince Brook via SWS 2 3.3 down 88% 99%
Dukinfield Rd Throstle Bank St CSO
Overflow on sewer network
Company site name
Junction of Dukinfield Road and Throstle Bank Street combined sewer overflow (441SN) (TAM0079)
EA ID / permit
UUP00663 · 01TAM0079
Outlet location
SJ9417095610 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
6 / 2.9
Long-term average
3.9 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
Unnamed Trib River Tame 2 3.2 down 67% 100%
Manchester Road CSO
Overflow on sewer network
Company site name
Manchester Road CSO
EA ID / permit
UUP01235 · 01TAM0088
Outlet location
SD9740001660 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
9 / 2.2
Long-term average
13.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
River Tame 18 3.2 up 100% 100%
Cartmel Close CSO
Overflow on sewer network
Company site name
Cartmel Close (Macclesfield) Combined Sewer Overflow (Site ID 273BV) (MAC0061)
EA ID / permit
UUP00416 · 016892095
Outlet location
SJ9082075120 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (Source to Dean) (GB112069061320)
2024 spills / hours
3 / 0.4
Long-term average
36.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
River Bollin 9 3.2 up 200% 100%
Blackwood Road CSO
Overflow on sewer network
Company site name
Blackwood Road
EA ID / permit
UUP00256 · 01ROS0031
Outlet location
SD8527021620 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Source to Whitewell Brook) (GB112069064660)
2024 spills / hours
3 / 3.8
Long-term average
2.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
River Irwell 2 3.2 down 33% 95%
Skirwith Hall CSO
Overflow on sewer network
Company site name
Skirwith Hall Combined Sewer Overflow
EA ID / permit
UUP01766 · 01EDE0003
Outlet location
NY6134032480 (OS grid reference) · View on Apple Maps
WFD catchment
Briggle Beck (GB102076073800)
2024 spills / hours
13 / 19
Long-term average
11.7 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 3.2 hours spilling →
Skirwith Beck 4 3.2 down 69% 96%
The Green CSO (EDE0123)
Overflow on sewer network
Company site name
O/S Fawell House CSO (174LB)
EA ID / permit
UUP02231 · EPRJB3795AR
Outlet location
NY6105327873 (OS grid reference) · View on Apple Maps
WFD catchment
Crowdundle Beck - Lower (GB102076070950)
2024 spills / hours
70 / 119
Long-term average
36.0 spills a year (monitored since 2024)
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 3.2 hours spilling →
Birk Sike 2 3.2 down 97% 85%
St Georges Road CSO
Overflow on sewer network
Company site name
St George's Road CSO
EA ID / permit
UUP01816 · 017160320
Outlet location
SD5482030450 (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
13 / 4.2
Long-term average
13.0 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
Moore Brook Culvert, a tributary of River Ribble via a surface water sewer 7 3.2 down 46% 96%
Warrington Road WA5 2JL CSO
Overflow on sewer network
Company site name
The Warrington Road CSO
EA ID / permit
UUP02028 · 016993441
Outlet location
SJ5727087730 (OS grid reference) · View on Apple Maps
WFD catchment
Whittle Brook (Mersey Estuary) (GB112069060990)
2024 spills / hours
13 / 10
Long-term average
15.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 3.1 hours spilling →
Whittle Brook 1 3.1 down 92% 100%
Fern Street CSO (078J3)
Overflow on sewer network
Company site name
Fern Street CSO
EA ID / permit
UUP00726 · 01BOL0146
Outlet location
SD7436006851 (OS grid reference) · View on Apple Maps
WFD catchment
Croal (including Blackshaw Brook) (GB112069064550)
2024 spills / hours
11 / 3.7
Long-term average
13.4 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.1 hours spilling →
River Croal 8 3.1 down 27% 100%
Fielden Street CSO
Overflow on sewer network
Company site name
Fielden Street CSO
EA ID / permit
UUP00732 · 017180518
Outlet location
SD6752027800 (OS grid reference) · View on Apple Maps
WFD catchment
Blakewater (GB112071065310)
2024 spills / hours
1 / 0.2
Long-term average
2.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.1 hours spilling →
River Blakewater 3 3.1 up 200% 99%
The Brow CSO 202UP
Overflow on sewer network
Company site name
The Brow CSO
EA ID / permit
UUP01910 · 016892107
Outlet location
SJ5315083440 (OS grid reference) · View on Apple Maps
WFD catchment
Manchester Ship Canal (GB71210004)
2024 spills / hours
12 / 6.3
Long-term average
12.1 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.1 hours spilling →
Manchester Ship Canal 3 3.1 down 75% 99%
Flag Lane N0 2 CSO 165JH
Overflow on sewer network
Company site name
FLAG LANE NO2 CSO
EA ID / permit
UUP00743 · 01CRE0037
Outlet location
SJ7003055320 (OS grid reference) · View on Apple Maps
WFD catchment
Valley Brook (Englesea Brook to Weaver) (GB112068055310)
2024 spills / hours
2 / 0.9
Long-term average
4.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.0 hours spilling →
Valley Brook 6 3.0 up 200% 100%
Junc Stringer St/New Bridge Ln CSO
Overflow on sewer network
Company site name
Junction Stringer Street/New Bridge Lane CSO
EA ID / permit
UUP01041 · 016892181
Outlet location
SJ9039090700 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Etherow to Mersey) (GB112069061000)
2024 spills / hours
0 / 0.0
Long-term average
1.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.0 hours spilling →
River Goyt via SWS 2 3.0 up from 0 100%
Bootle Northern Opc CSO 99102
Overflow on sewer network
Company site name
Bootle Northern OPC Combined Sewer Overflow
EA ID / permit
UUP00284 · 016931013
Outlet location
SJ3210095600 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
17 / 9.1
Long-term average
17.5 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.0 hours spilling →
Mersey Estuary 9 3.0 down 47% 100%
In Field Poulton M.H. 292 CSO
Overflow on sewer network
Company site name
In Field, Poulton M/H 292
EA ID / permit
UUP01015 · 01WYR0020
Outlet location
SD3528037971 (OS grid reference) · View on Apple Maps
WFD catchment
Hillylaid Pool - Tidal Wyre (GB112072066120)
Bathing water
Fleetwood
Shellfish water
Lune (Wyre Estuary)
2024 spills / hours
8 / 4.6
Long-term average
19.8 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.0 hours spilling →
Unnamed Tributary of Main Dyke 10 3.0 up 25% 100%
Knowle Street CSO 442BX
Overflow on sewer network
Company site name
Knowle Street CSO
EA ID / permit
UUP01091 · 016993732
Outlet location
SJ9666098600 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
3 / 1.7
Long-term average
2.9 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.9 hours spilling →
The River Tame 2 2.9 down 33% 100%
Holme St/Chapel St CSO (171ZK)
Overflow on sewer network
Company site name
Holme Street/Chapel Street CSO
EA ID / permit
UUP00979 · 017670168
Outlet location
NY6815020200 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - Scandal Beck to Lyvennet (GB102076070880)
2024 spills / hours
12 / 12
Long-term average
10.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2.9 hours spilling →
River Eden 7 2.9 down 42% 100%
208 Deepdale Road CSO
Overflow on sewer network
Company site name
208 Deepdale Road CSO
EA ID / permit
UUP00019 · 017180537
Outlet location
SD5453030430 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE_Transitional (GB531207112400)
2024 spills / hours
10 / 2.7
Long-term average
10.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.9 hours spilling →
Chain Caul Culvert Into Ribble 8 2.9 down 20% 94%
White Lion Brow CSO
Overflow on sewer network
EA ID / permit
UUP02113 · 01BOL0119
Outlet location
SD7123009280 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
0 / 0.0
Long-term average
11.7 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2.9 hours spilling →
River Croal 1 2.9 up from 0 100%
Frenchwood Knoll CSO 331UX
Overflow on sewer network
Company site name
Frenchwood Knoll CSO
EA ID / permit
UUP00763 · 017180524
Outlet location
SD5425028690 (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
46 / 21
Long-term average
94.9 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.9 hours spilling →
Swillbrook Culvert a tributary of the River Ribble (Tidal) 18 2.9 down 61% 100%
Mount Sion Road CSO
Overflow on sewer network
Company site name
Mount Sion Road
EA ID / permit
UUP01358 · 01BRY0037
Outlet location
SD7738006470 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Roch to Croal) (GB112069060840)
2024 spills / hours
0 / 0.0
Long-term average
1.5 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.9 hours spilling →
River Irwell 3 2.9 up from 0 85%
Manchester Rd CSO (351TT)
Overflow on sewer network
Company site name
Manchester Road (Near the Esplanade) CSO
EA ID / permit
UUP01228 · 01ROC0082
Outlet location
SD8934013200 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Source to Spodden) (GB112069064720)
2024 spills / hours
11 / 3.8
Long-term average
8.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.9 hours spilling →
River Roch via SWS 11 2.9 no change 100%
Carr Street CSO 099BP
Overflow on sewer network
Company site name
CARR STREET CSO
EA ID / permit
UUP00410 · 01BRY0001
Outlet location
SD7935016470 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Rossendale STW to Roch) (GB112069064620)
2024 spills / hours
13 / 6.5
Long-term average
18.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.9 hours spilling →
River Irwell 4 2.9 down 69% 97%
Laversdale STW
Inlet overflow at sewage works
Sewage works
Laversdale
Company site name
LAVERSDALE WWTW
EA ID / permit
UUP02196 · 017670067
Outlet location
NY4738062330 (OS grid reference) · View on Apple Maps
WFD catchment
Brunstock Beck (GB102076073970)
2024 spills / hours
0 / 0.0
Long-term average
4.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
Brunstock Beck 9 2.8 up from 0 98%
Worsley WwTW
Inlet overflow at sewage works
Sewage works
Worsley
Company site name
WORSLEY WwTW
EA ID / permit
UUP02178 · 016940139
Outlet location
SD7215002750 (OS grid reference) · View on Apple Maps
WFD catchment
Astley Brook (Mersey) (GB112069061100)
2024 spills / hours
11 / 1.8
Long-term average
11.4 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
Little Hulton Stream 12 2.8 up 9% 100%
Manshaw Road CSO
Overflow on sewer network
Company site name
Manshaw Road CSO
EA ID / permit
UUP01251 · 016982836
Outlet location
SJ9014397126 (OS grid reference) · View on Apple Maps
WFD catchment
Platt Brook (Source to Fallowfield Bk) (GB112069061060)
2024 spills / hours
5 / 15
Long-term average
8.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
Moss Brook via SWS 4 2.8 down 20% 100%
Edward Street (Northwich) CSO
Overflow on sewer network
Company site name
Edward Street (Northwich) CSO
EA ID / permit
UUP01422 · 01VRY0093
Outlet location
SJ6753073602 (OS grid reference) · View on Apple Maps
WFD catchment
Wade Brook (GB112068060370)
2024 spills / hours
3 / 1.3
Long-term average
3.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
Wade Brook 3 2.8 no change 97%
Renwick CSO (171MD)
Overflow on sewer network
Company site name
Renwick CSO
EA ID / permit
UUP01646 · 017680333
Outlet location
NY5954043250 (OS grid reference) · View on Apple Maps
WFD catchment
Raven Beck (GB102076073840)
2024 spills / hours
17 / 5.8
Long-term average
13.8 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
Harberry Beck 14 2.8 down 18% 100%
Rear of 65 Fulton Ave CSO 5130R
Overflow on sewer network
Company site name
Rear of 65 Fulton Avenue CSO
EA ID / permit
UUP01631 · 016881738
Outlet location
SJ2313087300 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
2024 spills / hours
28 / 81
Long-term average
21.5 spills a year (monitored since 2018)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.8 hours spilling →
Newton Brook 3 2.8 down 89% 100%
Scott Avenue/Hurstead Street CSO
Overflow on sewer network
Company site name
SCOTT AVENUE / HURSTHEAD STREET CSO
EA ID / permit
UUP01731 · 01HYN0039
Outlet location
SD7719026350 (OS grid reference) · View on Apple Maps
WFD catchment
Hyndburn (GB112071065040)
2024 spills / hours
17 / 4.4
Long-term average
14.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
Woodnook Water 11 2.8 down 35% 99%
Dock Street CSO 52567
Overflow on sewer network
Company site name
Dock Street Combined Sewer Overflow (Site ID 52567) (WYR0080)
EA ID / permit
UUP00647 · 017290502
Outlet location
SD3363047580 (OS grid reference) · View on Apple Maps
WFD catchment
Morecambe Bay - transitional (GB641211171000)
Bathing water
Fleetwood
Shellfish water
Lune (Wyre Estuary); Lune (Broadfleet and Plover Scar)
2024 spills / hours
4 / 2.2
Long-term average
5.3 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
Copse Brook Culvert 5 2.8 up 25% 100%
Halewood Pumping Station
Storm discharge at pumping station
Company site name
Halewood Pumping Station (HALEW) (HAL0134)
EA ID / permit
UUP00879 · 016983248
Outlet location
SJ4860082800 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
2024 spills / hours
4 / 3.0
Long-term average
4.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.7 hours spilling →
River Mersey Estuary 2 2.7 down 50% 100%
Woodbrook Road CSO
Overflow on sewer network
Company site name
Woodbrook Road CSO
EA ID / permit
UUP02164 · 01OLD0113
Outlet location
SD9671005270 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Source to Lumb Brook) (GB112069061151)
2024 spills / hours
2 / 0.5
Long-term average
1.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.7 hours spilling →
Wood Brook 2 2.7 no change 100%
Bardsea SPS(Toilet Block)
Storm discharge at pumping station
Company site name
Toilet Block Sewage PS
EA ID / permit
UUP00186 · 017280254
Outlet location
SD3021074320 (OS grid reference) · View on Apple Maps
WFD catchment
LEVEN - transitional (GB531207311900)
2024 spills / hours
1 / 2.4
Long-term average
4.9 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.7 hours spilling →
Bardsea Beck 3 2.7 up 200% 100%
Wallacre Road/Beaufort Drive CSO
Overflow on sewer network
Company site name
Wallacre Road/Beaufort Drive CSO
EA ID / permit
UUP02008 · 016892477
Outlet location
SJ2914991650 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
8 / 7.1
Long-term average
11.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.7 hours spilling →
Bidston Stream, a trib of the River Birket 4 2.7 down 50% 100%
Wyndham Terrace CSO
Overflow on sewer network
Company site name
Wyndham Terrace CSO
EA ID / permit
UUP02184 · 01COP0028
Outlet location
NY0128011300 (OS grid reference) · View on Apple Maps
WFD catchment
Ehen (lower) (GB112074069980)
Bathing water
St Bees
2024 spills / hours
4 / 0.9
Long-term average
7.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.6 hours spilling →
River Ehen 10 2.6 up 150% 99%
Victoria Street CSO
Overflow on sewer network
EA ID / permit
UUP02002 · 01BBN0047
Outlet location
SD6840028400 (OS grid reference) · View on Apple Maps
WFD catchment
Blakewater (GB112071065310)
2024 spills / hours
26 / 5.2
Long-term average
28.0 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2.6 hours spilling →
River Blakewater 11 2.6 down 58% 100%
Buckton Vale Road CSO
Overflow on sewer network
Company site name
Buckton Vale Road CSO
EA ID / permit
UUP00358 · 016993735
Outlet location
SD9768000050 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
5 / 2.5
Long-term average
2.6 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.6 hours spilling →
A Culverted Trib to River Tame 1 2.6 down 80% 100%

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.