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
Burnley Road CSO 099BL
Overflow on sewer network
Company site name
BURNLEY ROAD CSO
EA ID / permit
UUP00369 · 01BRY0006
Outlet location
SD8041013840 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Rossendale STW to Roch) (GB112069064620)
2024 spills / hours
62 / 74
Long-term average
73.8 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 101 hours spilling →
Walmersley Brook 67 101 up 8% 99%
Princes Prkway/M60 CSO 28051
Overflow on sewer network
Company site name
Princess Parkway/M60 CSO
EA ID / permit
UUP01581 · 016942049
Outlet location
SJ8254191081 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
51 / 341
Long-term average
46.3 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 100 hours spilling →
River Mersey 20 100 down 61% 99%
Hardwick Road CSO
Overflow on sewer network
Company site name
Hardwick Street CSO
EA ID / permit
UUP00901 · 016810704
Outlet location
SJ5253083240 (OS grid reference) · View on Apple Maps
WFD catchment
Manchester Ship Canal (GB71210004)
2024 spills / hours
24 / 74
Long-term average
32.8 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 100 hours spilling →
Manchester Ship Canal 34 100 up 42% 100%
Shakerley Road NO2 CSO
Overflow on sewer network
Company site name
Shakerley Road No 2 CSO
EA ID / permit
UUP01740 · 016983325
Outlet location
SD6869002250 (OS grid reference) · View on Apple Maps
WFD catchment
Bedford Brook (GB112069060810)
2024 spills / hours
20 / 126
Long-term average
33.8 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 100 hours spilling →
Shakerley Brook 19 100 down 5% 100%
George Street CSO
Overflow on sewer network
Company site name
George Street CSO
EA ID / permit
UUP00786 · 017580254
Outlet location
NY2513048150 (OS grid reference) · View on Apple Maps
WFD catchment
Wiza Beck (GB102075073390)
2024 spills / hours
57 / 72
Long-term average
68.7 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 100 hours spilling →
Wiza Beck 52 100 down 9% 100%
Rishton Tank CSO
Overflow on sewer network
EA ID / permit
UUP02192 · 017160074
Outlet location
SD7365630435 (OS grid reference) · View on Apple Maps
WFD catchment
Hyndburn Brook - Lower (GB112071065070)
2024 spills / hours
66 / 135
Long-term average
64.0 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 99 hours spilling →
Liverpool & Leeds Canal 54 99 down 18% 100%
Longtown WwTW
Inlet overflow at sewage works
Sewage works
Longtown
Company site name
LONGTOWN WwTW
EA ID / permit
UUP01183 · 017770003
Outlet location
NY3751068430 (OS grid reference) · View on Apple Maps
WFD catchment
Esk (Eden and Esk) (GB102077074190)
2024 spills / hours
33 / 76
Long-term average
41.8 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 99 hours spilling →
River Esk (Border) 46 99 up 39% 100%
St Nicholas Lane Pumping Station
Storm discharge at pumping station
Company site name
St Nicholas Lane Pumping Station (Site ID STNIC) (LAN0057)
EA ID / permit
UUP01829 · 017190855
Outlet location
SD4782068760 (OS grid reference) · View on Apple Maps
WFD catchment
KENT - transitional (GB531207312000)
Bathing water
Morecambe North; Morecambe South
Shellfish water
Morecambe Bay East
2024 spills / hours
65 / 102
Long-term average
38.1 spills a year (monitored since 2019)
High-spill reason (company)
Performance - Partial / no capacity due to blockage or restriction (e.g. roots / grid) - maintenance issue
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 99 hours spilling →
Mill Dam 56 99 down 14% 100%
Weir Street Combined Sewer Overflow
Overflow on sewer network
Company site name
WEIR STREET CSO
EA ID / permit
UUP02067 · 01VRY0102
Outlet location
SJ6567073230 (OS grid reference) · View on Apple Maps
WFD catchment
Weaver (Winsford Flashes to Dane) (GB112068060463)
2024 spills / hours
10 / 28
Long-term average
17.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 99 hours spilling →
River Weaver 24 99 up 140% 96%
Weston St Viking St CSO BOL0115
Overflow on sewer network
Company site name
Weston Street/Viking Street CSO
EA ID / permit
UUP02094 · 016983270
Outlet location
SD7242007900 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
51 / 112
Long-term average
64.8 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 99 hours spilling →
Jenny Beck Trib Rvr Croal 50 99 down 2% 100%
Ash Lane CSO
Overflow on sewer network
Company site name
Ash Lane
EA ID / permit
UUP00139 · 016920541
Outlet location
SJ4770085200 (OS grid reference) · View on Apple Maps
WFD catchment
Ditton Brook (Halewood to Mersey Estuary) (GB112069061390)
2024 spills / hours
15 / 117
Long-term average
23.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 98 hours spilling →
Ditton Brook 9 98 down 40% 94%
Lower Audley CSO
Overflow on sewer network
Company site name
Lower Audley Street CSO
EA ID / permit
UUP01202 · 017180646
Outlet location
SD6847027550 (OS grid reference) · View on Apple Maps
WFD catchment
Blakewater (GB112071065310)
2024 spills / hours
55 / 164
Long-term average
54.6 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 98 hours spilling →
Tributary of River Blakewater 40 98 down 27% 100%
Mavis Drive
Overflow on sewer network
Company site name
Mavis Drive CSO
EA ID / permit
UUP01265 · NPSWQD010696
Outlet location
SD5616014660 (OS grid reference) · View on Apple Maps
WFD catchment
Yarrow DS Big Lodge Water (GB112070064952)
2024 spills / hours
39 / 500
Long-term average
74.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 98 hours spilling →
Clancutt Brook 6 98 down 85% 99%
St Johns Wood CSO 272S9
Overflow on sewer network
Company site name
St Johns Road CSO
EA ID / permit
UUP01822 · 01MAC0026
Outlet location
SJ7692079330 (OS grid reference) · View on Apple Maps
WFD catchment
Birkin Brook - Source to Mobberley Brook (GB112069061340)
2024 spills / hours
40 / 88
Long-term average
97.6 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 98 hours spilling →
Birkin Brook via SWS 39 98 down 3% 94%
Crown Street CSO 071QI
Overflow on sewer network
Company site name
CROWN STREET CSO
EA ID / permit
UUP00579 · 01BOL0121
Outlet location
SD7182009420 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
87 / 89
Long-term average
94.0 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 98 hours spilling →
Croal Minor 78 98 down 10% 100%
St Helens STW
Inlet overflow at sewage works
Sewage works
St Helens
Company site name
St Helens Wastewater Treatment Works (Site STHEL) (016920130)
EA ID / permit
UUP01820 · 016920130
Outlet location
SJ5358095920 (OS grid reference) · View on Apple Maps
WFD catchment
Sankey Brook (Rainford Brook to Mersey) (GB112069061200)
2024 spills / hours
32 / 98
Long-term average
33.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 97 hours spilling →
Sankey Brook 22 97 down 31% 100%
Hagg Lane (Midland Terrace) PS
Storm discharge at pumping station
Company site name
Hagg Lane (Midland Terrace) Mill Head PS
EA ID / permit
UUP00873 · NPSWQD011001
Outlet location
SD4966071170 (OS grid reference) · View on Apple Maps
WFD catchment
Keer - Lower (GB112073064430)
Bathing water
Morecambe North
Shellfish water
Morecambe Bay East
2024 spills / hours
22 / 59
Long-term average
19.3 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 97 hours spilling →
River Keer 31 97 up 41% 100%
Parr Brook CSO
Overflow on sewer network
EA ID / permit
UUP01520 · 016983249
Outlet location
SD8157007270 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Spodden to Irwell) (GB112069064600)
2024 spills / hours
55 / 112
Long-term average
39.8 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 96 hours spilling →
Parr Brook 42 96 down 24% 100%
Inskip Street (082AK) CSO
Overflow on sewer network
Company site name
INSKIP STREET CSO
EA ID / permit
UUP01023 · 01BUR0022
Outlet location
SD7939033840 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
61 / 155
Long-term average
70.8 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 96 hours spilling →
River Calder 59 96 down 3% 99%
Graving Dock Pumping Station
Storm discharge at pumping station
Company site name
Graving Dock Pumping Station (Site ID 04525) (BRW0100)
EA ID / permit
UUP00832 · 017480340
Outlet location
SD1889069320 (OS grid reference) · View on Apple Maps
WFD catchment
Duddon Sands (GB641211172000)
Bathing water
Walney Biggar Bank; Walney West Shore; Walney Sandy Gap
Shellfish water
Walney; Roosebeck
2024 spills / hours
111 / 103
Long-term average
86.3 spills a year (monitored since 2019)
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 96 hours spilling →
Walney Channel 96 96 down 14% 100%
74 Slater Lane (Leyland) CSO
Overflow on sewer network
Company site name
74 Slater Lane (Leyland) CSO
EA ID / permit
UUP00057 · 01SRI0032
Outlet location
SD5233021570 (OS grid reference) · View on Apple Maps
WFD catchment
Lostock DS Farington Weir (GB112070064912)
2024 spills / hours
41 / 130
Long-term average
49.6 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 96 hours spilling →
River Lostock 34 96 down 17% 100%
42 Runcorn Road CSO
Overflow on sewer network
Company site name
42 Runcorn Road CSO
EA ID / permit
UUP00047 · 016892245
Outlet location
SJ6375074630 (OS grid reference) · View on Apple Maps
WFD catchment
Weaver (Dane to Frodsham) (GB112068060500)
2024 spills / hours
30 / 66
Long-term average
33.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 96 hours spilling →
Weaver Navigation 28 96 down 7% 99%
Bunbury STW
Inlet overflow at sewage works
Sewage works
Bunbury
Company site name
BUNBURY WwTW
EA ID / permit
UUP00364 · 016810027
Outlet location
SJ5733058130 (OS grid reference) · View on Apple Maps
WFD catchment
Gowy and tribs (Source to Milton Brook) (GB112068060280)
2024 spills / hours
58 / 158
Long-term average
51.4 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 95 hours spilling →
River Gowy 46 95 down 21% 100%
Noctorum Avenue CSO 512IB
Overflow on sewer network
Company site name
Noctorum Avenue CSO
EA ID / permit
UUP01402 · 016892430
Outlet location
SJ2807087940 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
2024 spills / hours
94 / 156
Long-term average
94.1 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 95 hours spilling →
River Fender 58 95 down 38% 100%
Westminster Road CSO
Overflow on sewer network
Company site name
Westminster Road CSO
EA ID / permit
UUP02090 · 016892096
Outlet location
SJ9118074470 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (Source to Dean) (GB112069061320)
2024 spills / hours
77 / 145
Long-term average
86.5 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 95 hours spilling →
River Bollin 61 95 down 21% 100%
Cuddington Pumping Station
Storm discharge at pumping station
Company site name
Cuddington Pumping Station
EA ID / permit
UUP00589 · EPRMB3297AV
Outlet location
SJ5986072515 (OS grid reference) · View on Apple Maps
WFD catchment
Cuddington Brook (Source to Crowton Brook) (GB112068060480)
2024 spills / hours
21 / 169
Long-term average
12.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 95 hours spilling →
Cuddington (Cliffe) Brooke 15 95 down 29% 100%
Kirkoswald WwTW
Storm tank at sewage works
Sewage works
Kirkoswald
Company site name
KIRKOSWALD WwTW
EA ID / permit
UUP01087 · 017670065
Outlet location
NY5471041200 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - Eamont to tidal (GB102076073940)
2024 spills / hours
27 / 46
Long-term average
20.2 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
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 95 hours spilling →
Trib River Eden 40 95 up 48% 100%
Ravenstown Pumping Station
Storm discharge at pumping station
Company site name
Ravenstown PS
EA ID / permit
UUP01615 · 017380497
Outlet location
SD3616074931 (OS grid reference) · View on Apple Maps
WFD catchment
LEVEN - transitional (GB531207311900)
2024 spills / hours
6 / 28
Long-term average
11.6 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 94 hours spilling →
Windermoor Main Drain 13 94 up 117% 55%
Dans Road Weates Close CSO 201Q2
Overflow on sewer network
Company site name
Dans Road/Weates Close
EA ID / permit
UUP00610 · 01HAL0041
Outlet location
SJ5395085220 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
2024 spills / hours
33 / 118
Long-term average
36.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 94 hours spilling →
River Mersey via SWS 21 94 down 36% 100%
Chancel Lane CSO 271I4
Overflow on sewer network
Company site name
CHANCEL LANE CSO
EA ID / permit
UUP00439 · 01MAC0046
Outlet location
SJ8481081550 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (Source to Dean) (GB112069061320)
2024 spills / hours
51 / 82
Long-term average
57.5 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 94 hours spilling →
River Bollin 45 94 down 12% 100%
Lodge Lane Pumping Station
Overflow on sewer network
Company site name
Lodge Lane (Near Ellams Brook) CSO
EA ID / permit
UUP01165 · 016993698
Outlet location
SJ5817296902 (OS grid reference) · View on Apple Maps
WFD catchment
Millingford (Newton) Brook (GB112069061220)
2024 spills / hours
39 / 473
Long-term average
46.5 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 94 hours spilling →
Ellams Brook,Trib Newton Brook 13 94 down 67% 100%
Netherfield Road CSO (32019)
Overflow on sewer network
Company site name
Netherfield Road CSO
EA ID / permit
UUP01375 · 017180620
Outlet location
SD8619037550 (OS grid reference) · View on Apple Maps
WFD catchment
Walverden Water (GB112071065130)
2024 spills / hours
58 / 113
Long-term average
62.0 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 94 hours spilling →
Walverden Water 46 94 down 21% 100%
Glasson Pumping Station
Storm discharge at pumping station
Company site name
Glasson PS
EA ID / permit
UUP00797 · 01ALL0123
Outlet location
NY2551060350 (OS grid reference) · View on Apple Maps
WFD catchment
SOLWAY (GB530207614700)
2024 spills / hours
58 / 121
Long-term average
48.8 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 94 hours spilling →
Un-Named Trib Solway Firth 48 94 down 17% 100%
Hoylake Road/Chapelhill CSO
Overflow on sewer network
Company site name
Hoylake Road/Chapelhill Road CSO
EA ID / permit
UUP00996 · 016881732
Outlet location
SJ2764090310 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
Bathing water
Moreton
Shellfish water
North Wirral (East)
2024 spills / hours
35 / 86
Long-term average
31.7 spills a year (monitored since 2019)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Jul
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 94 hours spilling →
River Fender 26 94 down 26% 89%
Snipe Clough CSO
Overflow on sewer network
Company site name
Snipe Clough CSO
EA ID / permit
UUP01777 · 016982237
Outlet location
SD9374903315 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Source to Lumb Brook) (GB112069061151)
2024 spills / hours
28 / 110
Long-term average
39.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 93 hours spilling →
Glodwick Brook 20 93 down 29% 100%
Belfield Road/Beswicke Royds St CSO
Overflow on sewer network
Company site name
Bellfield Road/Beswicke Royds Street
EA ID / permit
UUP00217 · EPRQB3592VZ
Outlet location
SD9086014030 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Source to Spodden) (GB112069064720)
2024 spills / hours
29 / 14
Long-term average
51.0 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 93 hours spilling →
Sanney Brook 40 93 up 38% 100%
Carlisle WwTW
Inlet overflow at sewage works
Sewage works
Carlisle
Company site name
CARLISLE WwTW
EA ID / permit
UUP00406 · 017670049
Outlet location
NY3847056520 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - Eamont to tidal (GB102076073940)
2024 spills / hours
25 / 119
Long-term average
44.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 92 hours spilling →
River Eden 17 92 down 32% 100%
Bank Lane Tintwistle CSO
Overflow on sewer network
Company site name
Bank Lane (Tintwistle) Combined Sewer Overflow
EA ID / permit
UUP00177 · 016993554
Outlet location
SK0206096980 (OS grid reference) · View on Apple Maps
WFD catchment
Etherow (Woodhead Res. to Glossop Bk.) (GB112069060780)
2024 spills / hours
71 / 111
Long-term average
102.6 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 92 hours spilling →
River Etherow 58 92 down 18% 100%
Peel Lane CSO No. 1
Overflow on sewer network
Company site name
Peel Lane CSO No 1 STORM OVERFLOW
EA ID / permit
UUP01526 · 016993593
Outlet location
SD8474011330 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Spodden to Irwell) (GB112069064600)
2024 spills / hours
55 / 98
Long-term average
68.5 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 92 hours spilling →
River Roch 43 92 down 22% 100%
Gasworks Yard Pumping Station
Storm discharge at pumping station
Company site name
Gas Yard Pumping Station
EA ID / permit
UUP00779 · 01CON0012
Outlet location
SJ7035066410 (OS grid reference) · View on Apple Maps
WFD catchment
Croco (GB112068055460)
2024 spills / hours
29 / 76
Long-term average
44.1 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 92 hours spilling →
River Croco 37 92 up 28% 100%
Leasowe Road CSO
Overflow on sewer network
Company site name
Leasowe Road CSO
EA ID / permit
UUP01127 · 016892469
Outlet location
SJ2905092110 (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
41 / 151
Long-term average
104.9 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 91 hours spilling →
Bidston Stream 53 91 up 29% 100%
Mere Heath Pumping Station
Storm discharge at pumping station
Company site name
Mere Heath PS
EA ID / permit
UUP01287 · 016881958
Outlet location
SJ6659069880 (OS grid reference) · View on Apple Maps
WFD catchment
Dane (Wheelock to Weaver) (GB112068060470)
2024 spills / hours
4 / 11
Long-term average
7.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 91 hours spilling →
Peckmill Bk (Trib of R.Dane) 18 91 up 350% 100%
Royal Oak CSO 07039
Overflow on sewer network
Company site name
Royal Oak CSO
EA ID / permit
UUP01692 · 016983304
Outlet location
SD7347011870 (OS grid reference) · View on Apple Maps
WFD catchment
Bradshaw Brook (GB112069064580)
2024 spills / hours
159 / 1,351
Long-term average
143.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 91 hours spilling →
Bradshaw Brook 25 91 down 84% 100%
Rear 24 Bispham Avenue CSO
Overflow on sewer network
Company site name
Rear of No. 24 Bispham Avenue CSO
EA ID / permit
UUP01620 · EPRSB3398AS
Outlet location
SD5343023820 (OS grid reference) · View on Apple Maps
WFD catchment
Lostock US Farington Weir (GB112070064911)
2024 spills / hours
29 / 76
Long-term average
13.8 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 91 hours spilling →
River Lostock 40 91 up 38% 98%
Stoneclough Road CSO 07045
Overflow on sewer network
Company site name
Singing Clough CSO
EA ID / permit
UUP01869 · 016941213
Outlet location
SD7490005105 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Croal to Irk) (GB112069061451)
2024 spills / hours
55 / 122
Long-term average
58.8 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 91 hours spilling →
Singing Clough Brook 41 91 down 25% 100%
Tbc
Storm discharge at pumping station
Company site name
Morecambe Lodge PS (25920)
EA ID / permit
UUP02255 · Permit applied for
Outlet location
SD4724567409 (OS grid reference) · View on Apple Maps
WFD catchment
Keer (GB112073071240)
2024 spills / hours
– / –
Long-term average
13.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 90 hours spilling →
Unnamed trib of Hatlex Beck 13 90 100%
Accrington Road CSO
Overflow on sewer network
Company site name
Accrington Road CSO
EA ID / permit
UUP00076 · 017180645
Outlet location
SD7110028060 (OS grid reference) · View on Apple Maps
WFD catchment
Blakewater (GB112071065310)
2024 spills / hours
54 / 212
Long-term average
60.3 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 90 hours spilling →
Clvrt'D Section Knuzden Brook 43 90 down 20% 100%
Town Lane Circular Road CSO 44020
Overflow on sewer network
Company site name
Town Lane/Circular Road CSO
EA ID / permit
UUP01956 · 01TAM0067
Outlet location
SJ9192094851 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
59 / 132
Long-term average
65.9 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 90 hours spilling →
Denton Brook Trib River Tame 46 90 down 22% 99%
Spring Gardens Waddington CSO
Overflow on sewer network
Company site name
Spring Gardens(Waddington) CSO
EA ID / permit
UUP01804 · 01RIB0004
Outlet location
SD7306043500 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble DS Stock Beck (GB112071065612)
Bathing water
River Ribble at Edisford Bridge
2024 spills / hours
69 / 117
Long-term average
69.2 spills a year (monitored since 2017)
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 90 hours spilling →
Waddington Brook 48 90 down 30% 100%
Lawton Gate WwTW
Inlet overflow at sewage works
Sewage works
Lawton Gate
Company site name
LAWTON GATE WwTW
EA ID / permit
UUP01121 · 016810085
Outlet location
SJ8090156485 (OS grid reference) · View on Apple Maps
WFD catchment
Kidsgrove Stream (including Day Green Stream) (GB112068055390)
2024 spills / hours
22 / 96
Long-term average
27.2 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 90 hours spilling →
Kidsgrove Stream 24 90 up 9% 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.