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
Gloucester Street
Overflow on sewer network
Company site name
Gloucester Street CSO
EA ID / permit
UUP00811 · 01STH0054
Outlet location
SJ5246094970 (OS grid reference) · View on Apple Maps
WFD catchment
Sankey Brook (Hardshaw Brook to Rainford Brook (GB112069061180)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Sankey Brook 0 0.0 no change 96%
Grange Lane CSO
Overflow on sewer network
EA ID / permit
UUP00825 · 01HYN0033
Outlet location
SD7623028250 (OS grid reference) · View on Apple Maps
WFD catchment
Hyndburn (GB112071065040)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Broad Oak Water 0 0.0 no change 100%
Great Bolton Street CSO
Overflow on sewer network
Company site name
Great Bolton Street CSO
EA ID / permit
UUP00835 · 01BBN0025
Outlet location
SD6806827642 (OS grid reference) · View on Apple Maps
WFD catchment
Blakewater (GB112071065310)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Blakewater 0 0.0 no change 97%
Gynn Square
Overflow on sewer network
Company site name
Gynn Square CSO
EA ID / permit
UUP00870 · 017180573
Outlet location
SD3060037800 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY MOUTH - coastal (GB641211630001)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Monitor below 90%
Comms failure / issue · Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Irish Sea 0 0.0 no change 70%
Hall Coppice SSO
Overflow on sewer network
Company site name
Hall Coppice CSO
EA ID / permit
UUP00880 · 016950415
Outlet location
SD7085014340 (OS grid reference) · View on Apple Maps
WFD catchment
Eagley Brook (GB112069064570)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Eagley Brook 0 0.0 no change 99%
Hanover Street CSO
Overflow on sewer network
EA ID / permit
UUP00895 · 01TAM0111
Outlet location
SJ9590098820 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Culvert to River Tame 0 0.0 no change 99%
Heads Nook Pumping Station
Storm discharge at pumping station
Company site name
Heads Nook Pumping Station (10507) (CAR0080)
EA ID / permit
UUP00930 · 017680325
Outlet location
NY4961055290 (OS grid reference) · View on Apple Maps
WFD catchment
Trout Beck (Cairn Beck) (GB102076073900)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Trib Trout Beck 0 0.0 no change 100%
Hendham Vale CSO
Overflow on sewer network
Company site name
Hendham Vale CSO
EA ID / permit
UUP00940 · 016993691
Outlet location
SD8519900880 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
The River Irk 0 0.0 no change 100%
Hunsonby CSO (171ME)
Overflow on sewer network
Company site name
Hunsonby CSO
EA ID / permit
UUP01000 · 017680354
Outlet location
NY5807035440 (OS grid reference) · View on Apple Maps
WFD catchment
Robberby Water (GB102076073810)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Robberby Water 0 0.0 no change 100%
Illingworth Avenue
Overflow on sewer network
Company site name
Illingworth Avenue CSO
EA ID / permit
UUP01014 · 016982691
Outlet location
SJ9727098430 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Stocks Brook 0 0.0 no change 96%
Lady Beck CSO (172CN)
Overflow on sewer network
Company site name
Lady Beck CSO
EA ID / permit
UUP01096 · 01EDE0005
Outlet location
NY5012026861 (OS grid reference) · View on Apple Maps
WFD catchment
Eamont (Upper) (GB102076071020)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2021)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Lady Beck 0 0.0 no change 83%
Leigh WwTW
Inlet overflow at sewage works
Sewage works
Leigh
Company site name
LEIGH WwTW
EA ID / permit
UUP01130 · 016920134
Outlet location
SJ6581099000 (OS grid reference) · View on Apple Maps
WFD catchment
Pennington Brook (Glaze) (GB112069060760)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2021)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Pennington Brook 0 0.0 no change 86%
Little Hulton CSO
Overflow on sewer network
EA ID / permit
UUP01154 · 01SAL0130
Outlet location
SD7135003630 (OS grid reference) · View on Apple Maps
WFD catchment
Astley Brook (Mersey) (GB112069061100)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Astley Brook 0 0.0 no change 100%
Liverpool Road CSO (088NF)
Overflow on sewer network
Company site name
Liverpool Road (Burnley) CSO
EA ID / permit
UUP01159 · 01BUR0012
Outlet location
SD8219032540 (OS grid reference) · View on Apple Maps
WFD catchment
Green Brook (GB112071065080)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Calder 0 0.0 no change 99%
Lostock Junction Lane CSO
Overflow on sewer network
Company site name
Lostock Junction Lane CSO
EA ID / permit
UUP01191 · 016983108
Outlet location
SD6732808587 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Bessy Brook 0 0.0 no change 100%
Mad Hatter Pub
Overflow on sewer network
Company site name
The Mad Hatter Pub CSO
EA ID / permit
UUP01219 · 016982724
Outlet location
SJ8725095540 (OS grid reference) · View on Apple Maps
WFD catchment
Platt Brook (Source to Fallowfield Bk) (GB112069061060)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Gore Brook 0 0.0 no change 68%
Market Street/Trinity Street CSO
Overflow on sewer network
Company site name
MARKET STREET / TRINITY STREET CSO
EA ID / permit
UUP01253 · 01TAM0100
Outlet location
SJ9635098600 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Tame 0 0.0 no change 100%
Marland Hill SSO
Overflow on sewer network
Company site name
Marland Hill SSO
EA ID / permit
UUP01254 · 01ROC0157
Outlet location
SD8819012282 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Spodden to Irwell) (GB112069064600)
2024 spills / hours
– / –
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
River Roch 0 0.0 99%
Mayfields Drive Ww Ntwk PS
Storm discharge at pumping station
Company site name
Mayfield Drive Ww Ntwk PS
EA ID / permit
UUP01267 · 01WIR0109
Outlet location
SJ3650081802 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Mersey Estuary 0 0.0 no change 86%
Melbourne Street
Overflow on sewer network
Company site name
Melbourne Street CSO
EA ID / permit
UUP01277 · 016993731
Outlet location
SJ9628098530 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Tame 0 0.0 no change 99%
Newbridge Lane CSO
Overflow on sewer network
Company site name
Newbridge Lane CSO
EA ID / permit
UUP01385 · 016982656
Outlet location
SJ9080790947 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Etherow to Mersey) (GB112069061000)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Goyt 0 0.0 no change 95%
Oldham WwTW
Inlet overflow at sewage works
Sewage works
Oldham
Company site name
OLDHAM WwTW
EA ID / permit
UUP01459 · 016950038
Outlet location
SD8937004430 (OS grid reference) · View on Apple Maps
WFD catchment
Wince Brook (GB112069061120)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Wince Brook 0 0.0 no change 100%
Park Lane D/S of S.W.
Storm discharge at pumping station
Company site name
Park Lane PS
EA ID / permit
UUP01509 · 01BRY0075
Outlet location
SD7998004962 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Croal to Irk) (GB112069061451)
Bathing water
Fleetwood
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Unknown 0 0.0 no change 100%
Park Road North
Overflow on sewer network
Company site name
Park Road North
EA ID / permit
UUP01514 · 01STH0076
Outlet location
SJ5913095410 (OS grid reference) · View on Apple Maps
WFD catchment
Millingford (Newton) Brook (GB112069061220)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Millingford (Newton) Brook 0 0.0 no change 84%
Penrith Outfall CSO
Overflow on sewer network
Company site name
Penrith Outfall CSO
EA ID / permit
UUP01535 · 017680281
Outlet location
NY5417029470 (OS grid reference) · View on Apple Maps
WFD catchment
Eamont (Lower) (GB102076070990)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Eamont 0 0.0 no change 98%
Penrith Rd
Overflow on sewer network
Company site name
Penrith Road
EA ID / permit
UUP01536 · 01ALL0070
Outlet location
NY2724023660 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent US Bassenthwaite Lake (GB112075073561)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Greta 0 0.0 no change 93%
Peppermint Bridge CSO
Overflow on sewer network
Company site name
Peppermint Bridge CSO
EA ID / permit
UUP01540 · EPRJB3896EL
Outlet location
SD9437211958 (OS grid reference) · View on Apple Maps
WFD catchment
Beal (GB112069064690)
2024 spills / hours
61 / 789
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Piethorne Brook Trib Rvr Beal 0 0.0 down 100% 95%
Percy Street CSO
Overflow on sewer network
Company site name
Percy Street CSO
EA ID / permit
UUP01541 · 017190768
Outlet location
SD5528128742 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE_Transitional (GB531207112400)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Storm Culvert,Trib of Ribble 0 0.0 no change 100%
Playfair St
Overflow on sewer network
Company site name
Playfair St/Park Row CSO
EA ID / permit
UUP01554 · 01BOL0069
Outlet location
SD7175012950 (OS grid reference) · View on Apple Maps
WFD catchment
Eagley Brook (GB112069064570)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Eagley Brook 0 0.0 no change 99%
Queens Road (Darwen) CSO
Overflow on sewer network
Company site name
Queen's Road CSO
EA ID / permit
UUP01595 · 017180470
Outlet location
SD6966020510 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - headwaters to conf Davy Field Bk (GB112071065240)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tributary of River Darwen 0 0.0 no change 95%
Rear of 68 Whitbarrow Rd
Overflow on sewer network
Company site name
Rear of 68 Whitbarrow Road
EA ID / permit
UUP01632 · 016982698
Outlet location
SJ6751087830 (OS grid reference) · View on Apple Maps
WFD catchment
Manchester Ship Canal (GB71210004)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Trib M/Chester Ship Canal 0 0.0 no change 70%
Redvales Road CSO
Overflow on sewer network
Company site name
Redvales Road CSO
EA ID / permit
UUP01642 · 01BRY0024
Outlet location
SD8025409233 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Rossendale STW to Roch) (GB112069064620)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Irwell via Culvert 0 0.0 no change 94%
Revidge Rd/Preston New Rd SSO
Overflow on sewer network
Company site name
Revidge Road/Preston New Road
EA ID / permit
UUP01647 · 017180474
Outlet location
SD6622028840 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - conf Roddlesworth to tidal (GB112071065300)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Trib Arley Brook 0 0.0 no change 99%
Sefton Avenue CSO (CON0090)
Overflow on sewer network
Company site name
Sefton Avenue combined sewer overflow
EA ID / permit
UUP01736 · EPRJB3896NC
Outlet location
SJ8603863236 (OS grid reference) · View on Apple Maps
WFD catchment
Dane (Cow Brook to Wheelock) (GB112068060190)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Dane via S/Water Sewer 0 0.0 no change 96%
St George Street/Hanover Street CSO
Overflow on sewer network
Company site name
St. George Street/Hanover Street CSO
EA ID / permit
UUP01815 · 01TAM0118
Outlet location
SJ9591098541 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Tame 0 0.0 no change 98%
Sudellside Street CSO (052T9)
Overflow on sewer network
Company site name
Sudellside Street CSO
EA ID / permit
UUP01889 · 017180466
Outlet location
SD6980022210 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - headwaters to conf Davy Field Bk (GB112071065240)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Trib River Darwen 0 0.0 no change 89%
Talke Industrial Est CSO
Overflow on sewer network
Company site name
Talke Industrial Estate Combined Sewer Overflow (Site ID 292UG) (NEW0037)
EA ID / permit
UUP01895 · 016881957
Outlet location
SJ8205052251 (OS grid reference) · View on Apple Maps
WFD catchment
Valley Brook (Source to Englesea Brook) (GB112068074630)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Trib Valley Brook 0 0.0 no change 90%
Thorncliffe Rd/Cliff Ln CSO
Overflow on sewer network
Company site name
Thorncliff Road/Cliff Lane CSO
EA ID / permit
UUP01930 · 017480405
Outlet location
SD2194069340 (OS grid reference) · View on Apple Maps
WFD catchment
Mill Beck (Poaka Beck) (GB112074069790)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Roose Brook/Millbeck 0 0.0 no change 100%
Urmston SSO
Overflow on sewer network
Company site name
Richmond Road CSO
EA ID / permit
UUP01982 · 016941193
Outlet location
SJ7786097992 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Manchester Ship Canal 0 0.0 no change 99%
Whalley Range / Wesley Street CSO
Overflow on sewer network
Company site name
Whalley Range/Westley Street CSO
EA ID / permit
UUP02100 · NPSWQD010693
Outlet location
SD6893029050 (OS grid reference) · View on Apple Maps
WFD catchment
Blakewater (GB112071065310)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Blakewater 0 0.0 no change 96%
Whitegate WwTW
Storm tank at sewage works
Sewage works
Whitegate
Company site name
WHITEGATE WwTW
EA ID / permit
UUP02115 · 016810114
Outlet location
SJ6315068970 (OS grid reference) · View on Apple Maps
WFD catchment
PETTYPOOL BROOK (GB112068060540)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Pettypool Brook tributary of River Weaver 0 0.0 no change 100%
Wilmslow Rd/Brook Rd CSO
Overflow on sewer network
Company site name
Wilmslow Road/Brook road CSO
EA ID / permit
UUP02136 · 016982985
Outlet location
SJ8534093480 (OS grid reference) · View on Apple Maps
WFD catchment
Fallowfield Brook (GB112069061410)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Leigh Brook 0 0.0 no change 97%
Wood Lane/Glentree Close CSO
Overflow on sewer network
Company site name
Wood Lane/ Glentree Close CSO
EA ID / permit
UUP02159 · 016892444
Outlet location
SJ2555788174 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Arrowe Brook Trib R. Birkett 0 0.0 no change 73%
Primrose Street/Ellesmere Street CSO
Overflow on sewer network
EA ID / permit
UUP02191 · 016983323
Outlet location
SD6875102302 (OS grid reference) · View on Apple Maps
WFD catchment
Bedford Brook (GB112069060810)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Shakerley Brook 0 0.0 no change 100%
Tbc
Overflow on sewer network
Company site name
Boothfold Bridge CSO (369DI)
EA ID / permit
UUP02200 · Unpermitted
Outlet location
SD8365222140 (OS grid reference) · View on Apple Maps
WFD catchment
Whitewell Brook (GB112069064670)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Whitewell Brook via surface water sewer 0 0.0 no change 98%
Tbc
Overflow on sewer network
Company site name
Cheetham Street / St Marys Gate CSO (353CC)
EA ID / permit
UUP02203 · Permit applied for
Outlet location
SD8976213754 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Source to Spodden) (GB112069064720)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Culverted section of River Roch 0 0.0 no change 90%
Tbc
Overflow on sewer network
Company site name
Darley Street CSO (079KL)
EA ID / permit
UUP02205 · Permit applied for
Outlet location
SD7217710200 (OS grid reference) · View on Apple Maps
WFD catchment
Tonge (GB112069064530)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Tonge via a surface water sewer 0 0.0 no change 100%
Tbc
Overflow on sewer network
Company site name
Fleming Rd CSO (263DZ)
EA ID / permit
UUP02210 · Permit applied for
Outlet location
SJ4362584776 (OS grid reference) · View on Apple Maps
WFD catchment
Ditton Brook (Halewood to Mersey Estuary) (GB112069061390)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Ditton Brook 0 0.0 no change 98%
High Road Halton CSO LAN0124 259DA
Overflow on sewer network
Company site name
High Road CSO (259DA)
EA ID / permit
UUP02214 · EPRJB3597EQ
Outlet location
SD5039565040 (OS grid reference) · View on Apple Maps
WFD catchment
Lune - conf Wenning to tidal (GB112072065980)
Shellfish water
Morecambe Bay East
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Lune via a surface 0 0.0 no change 81%
Tbc
Overflow on sewer network
Company site name
Liverpool Road CSO (42062)
EA ID / permit
UUP02219 · Permit applied for
Outlet location
SJ5089595188 (OS grid reference) · View on Apple Maps
WFD catchment
Hardshaw (Windle) Brook (GB112069061210)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Hardshaw Brook 0 0.0 no change 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.