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
Mobberley Rd CSO
Overflow on sewer network
Company site name
Mobberley Road Combined Sewer Overflow (Site ID 272GZ) (MAC0122)
EA ID / permit
UUP01330 · 016892553
Outlet location
SJ7684079530 (OS grid reference) · View on Apple Maps
WFD catchment
Birkin Brook - Source to Mobberley Brook (GB112069061340)
2024 spills / hours
41 / 32
Long-term average
53.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2.6 hours spilling →
Birkin Brook 2 2.6 down 95% 94%
Birch Hall Ln Thoresway Rd CSO
Overflow on sewer network
Company site name
Birch Hall Lane/Thoresway Road CSO
EA ID / permit
UUP00242 · 01MAN0245
Outlet location
SJ8633095170 (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
1.8 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.6 hours spilling →
Gore Brook via SWS 3 2.6 up from 0 100%
Rear No.1 Hastings Road CSO 381P8
Overflow on sewer network
Company site name
Rear No.1 Hastings Road CSO
EA ID / permit
UUP01623 · 01SEF0055
Outlet location
SD3302013223 (OS grid reference) · View on Apple Maps
WFD catchment
Three Pool's Waterway (GB112070064830)
2024 spills / hours
6 / 3.7
Long-term average
7.0 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.6 hours spilling →
Sandy Brook 7 2.6 up 17% 99%
Ashburton Rd/Central Park CSO
Overflow on sewer network
Company site name
Ashburton Road/Central Park CSO
EA ID / permit
UUP00141 · 016982253
Outlet location
SJ7786297993 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
5 / 3.1
Long-term average
7.5 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.6 hours spilling →
Manchester Ship Canal via SWS 3 2.6 down 40% 100%
Towngate/Fox Lane CSO
Overflow on sewer network
Company site name
Towngate/ Fox Lane CSO
EA ID / permit
UUP01960 · 017081318
Outlet location
SD5401021320 (OS grid reference) · View on Apple Maps
WFD catchment
Lostock DS Farington Weir (GB112070064912)
2024 spills / hours
5 / 3.0
Long-term average
4.4 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.5 hours spilling →
Cricketfield Brook via SWS 6 2.5 up 20% 96%
Cleveland Rd Delauneys Rd CSO 281KK
Overflow on sewer network
Company site name
Cleveland Road/Delaunays CSO
EA ID / permit
UUP00501 · 016993738
Outlet location
SD8500002810 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
8 / 3.1
Long-term average
11.0 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.5 hours spilling →
River Irk 8 2.5 no change 100%
In Front of No.19 Bear Street CSO
Overflow on sewer network
Company site name
Bear Street CSO
EA ID / permit
UUP01017 · NPSWQD010104
Outlet location
SD8046033002 (OS grid reference) · View on Apple Maps
WFD catchment
Green Brook (GB112071065080)
2024 spills / hours
3 / 3.5
Long-term average
5.5 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2.5 hours spilling →
Sweet Clough Trib Green Brook 3 2.5 no change 100%
Chestergate/King Street West CSO
Overflow on sewer network
Company site name
Chestergate/King Street West CSO
EA ID / permit
UUP00463 · 016982674
Outlet location
SJ8899090260 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
4 / 1.9
Long-term average
27.3 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.5 hours spilling →
River Mersey 5 2.5 up 25% 98%
29 Cresswellshawe Rd B CSO 13567
Overflow on sewer network
Company site name
29 Cresswellshawe Road (Overflow B) CSO
EA ID / permit
UUP00030 · 016892426
Outlet location
SJ7989056280 (OS grid reference) · View on Apple Maps
WFD catchment
Kidsgrove Stream (including Day Green Stream) (GB112068055390)
2024 spills / hours
10 / 2.3
Long-term average
14.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.5 hours spilling →
Cresswellshawe Brk via SWS 8 2.5 down 20% 95%
Milverton Avenue
Overflow on sewer network
Company site name
Hattersley SSO
EA ID / permit
UUP01329 · 016982222
Outlet location
SJ9717094480 (OS grid reference) · View on Apple Maps
WFD catchment
Wilson Brook (GB112069061280)
2024 spills / hours
8 / 24
Long-term average
4.5 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
Volume & pollution
Estimate from 2.4 hours spilling →
Wilson Brook 1 2.4 down 88% 85%
Spencer Street/Darwin Street CSO
Overflow on sewer network
Company site name
SPENCER STREET / DARWIN STREET CSO
EA ID / permit
UUP01800 · 01VRY0067
Outlet location
SJ6559073060 (OS grid reference) · View on Apple Maps
WFD catchment
Dane (Wheelock to Weaver) (GB112068060470)
2024 spills / hours
7 / 1.8
Long-term average
9.4 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.4 hours spilling →
Weaver Navigation via SWS 8 2.4 up 14% 100%
Dock Road SPS
Storm discharge at pumping station
Company site name
Dock Road Sewage PS
EA ID / permit
UUP00645 · 016810823
Outlet location
SJ6568073230 (OS grid reference) · View on Apple Maps
WFD catchment
Weaver (Winsford Flashes to Dane) (GB112068060463)
2024 spills / hours
7 / 1.9
Long-term average
5.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.4 hours spilling →
River Weaver 3 2.4 down 57% 100%
Kirkoswald Village Pumping Station
Storm discharge at pumping station
Company site name
Kirkoswald PS
EA ID / permit
UUP01088 · 01EDE0067
Outlet location
NY5553041150 (OS grid reference) · View on Apple Maps
WFD catchment
Raven Beck (GB102076073840)
2024 spills / hours
2 / 0.5
Long-term average
6.8 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Resolved - Mar
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.4 hours spilling →
Raven Beck 5 2.4 up 150% 81%
Warrington New Road CSO
Overflow on sewer network
Company site name
Warrington New Road CSO
EA ID / permit
UUP02021 · 01STH0052
Outlet location
SJ5195095050 (OS grid reference) · View on Apple Maps
WFD catchment
Hardshaw (Windle) Brook (GB112069061210)
2024 spills / hours
5 / 2.6
Long-term average
5.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.4 hours spilling →
Hardshaw Brook 6 2.4 up 20% 100%
Artlebeck Combined Sewer Overflow
Overflow on sewer network
Company site name
Artle Beck Road CSO
EA ID / permit
UUP00138 · 017280359
Outlet location
SD5345064650 (OS grid reference) · View on Apple Maps
WFD catchment
Artle Beck (GB112072065960)
2024 spills / hours
10 / 2.0
Long-term average
9.6 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.3 hours spilling →
Artle Beck 9 2.3 down 10% 97%
Junction of Ashton New Road CSO
Overflow on sewer network
Company site name
Junction of Ashton New Road CSO
EA ID / permit
UUP01043 · 016982734
Outlet location
SJ8732097120 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
2 / 0.2
Long-term average
0.7 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.3 hours spilling →
Culverted tributary of Corn Brook 1 2.3 down 50% 100%
Bridge St West CSO (281F9)
Overflow on sewer network
Company site name
Bridge Street West CSO
EA ID / permit
UUP00317 · 016993550
Outlet location
SJ8332098360 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
5 / 2.0
Long-term average
5.4 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.3 hours spilling →
The River Irwell 4 2.3 down 20% 100%
Rosemary Lane CSO 252PG
Overflow on sewer network
Company site name
Rosemary Lane CSO
EA ID / permit
UUP01686 · 017280276
Outlet location
SD4782061820 (OS grid reference) · View on Apple Maps
WFD catchment
LUNE (GB531207212100)
Bathing water
Morecambe South
Shellfish water
Morecambe Bay East; Lune (Broadfleet and Plover Scar)
2024 spills / hours
6 / 2.0
Long-term average
19.4 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Apr
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.2 hours spilling →
The Lune Estuary, via Mill Race Culvert 8 2.2 up 33% 76%
Off Huddersfield Road CSO 442JA
Overflow on sewer network
Company site name
Off Huddersfield Road CSO
EA ID / permit
UUP01442 · 016993725
Outlet location
SJ9785099480 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
6 / 4.4
Long-term average
21.6 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.2 hours spilling →
Clvrt Sec Unnamed Trib Rvrtame 2 2.2 down 67% 96%
Ashton Old Rd Manshaw St CSO 281CD
Overflow on sewer network
Company site name
ASHTON OLD ROAD / MANSHAW STREET CSO
EA ID / permit
UUP00145 · 01MAN0204
Outlet location
SJ9014097320 (OS grid reference) · View on Apple Maps
WFD catchment
Platt Brook (Source to Fallowfield Bk) (GB112069061060)
2024 spills / hours
14 / 8.6
Long-term average
12.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.2 hours spilling →
Moss Brook 5 2.2 down 64% 99%
Hatley Lane Combined Sewer Overflow
Overflow on sewer network
Company site name
Hatley Lane
EA ID / permit
UUP00914 · 016881726
Outlet location
SJ5070077310 (OS grid reference) · View on Apple Maps
WFD catchment
Weaver (Dane to Frodsham) (GB112068060500)
2024 spills / hours
17 / 7.5
Long-term average
14.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.2 hours spilling →
Frodsham Marsh Ditch 11 2.2 down 35% 98%
Banbury Close CSO
Overflow on sewer network
Company site name
Banbury Close CSO
EA ID / permit
UUP00176 · 01MAC0064
Outlet location
SJ9227074880 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (Source to Dean) (GB112069061320)
2024 spills / hours
3 / 0.6
Long-term average
16.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.2 hours spilling →
Shoresclough Brook 5 2.2 up 67% 99%
The Flats CSO 171U1
Overflow on sewer network
Company site name
The Flats CSO
EA ID / permit
UUP01919 · 017680350
Outlet location
NY5074046100 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - Eamont to tidal (GB102076073940)
2024 spills / hours
5 / 2.1
Long-term average
16.8 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.2 hours spilling →
River Eden 7 2.2 up 40% 100%
Hindburn Bridge Pumping Station
Storm discharge at pumping station
Company site name
Hindburn Bridge PS
EA ID / permit
UUP00313 · 01LAN0047
Outlet location
SD6056067502 (OS grid reference) · View on Apple Maps
WFD catchment
Roeburn (GB112072066020)
2024 spills / hours
12 / 4.2
Long-term average
5.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.2 hours spilling →
River Roeburn 8 2.2 down 33% 100%
D/S 56 Barrow Bridge Road CSO
Overflow on sewer network
Company site name
Downstream of No. 56 Barrow Bridge Road CSO
EA ID / permit
UUP00595 · 016950315
Outlet location
SD6898011660 (OS grid reference) · View on Apple Maps
WFD catchment
Astley Brook (Irwell) (GB112069064560)
2024 spills / hours
0 / 0.0
Long-term average
0.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.2 hours spilling →
Dean Brook 2 2.2 up from 0 100%
Middle Pool PS Middp LAN0099
Storm discharge at pumping station
Company site name
Middle Pool Pumping Station (Site ID MIDDP) (LAN0099)
EA ID / permit
UUP01294 · 017280289
Outlet location
SD4348058330 (OS grid reference) · View on Apple Maps
WFD catchment
Overton Dyke (GB112072065950)
Bathing water
Morecambe South
2024 spills / hours
3 / 1.3
Long-term average
1.8 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.1 hours spilling →
Lades Pool, a tributary of the River Lune Estuary 1 2.1 down 67% 100%
Platt Lane CSO (502L1) WIG0016
Overflow on sewer network
Company site name
PLATT LANE CSO
EA ID / permit
UUP01552 · 01WIG0016
Outlet location
SD5951306053 (OS grid reference) · View on Apple Maps
WFD catchment
Douglas - Mid (GB112070064780)
2024 spills / hours
4 / 2.8
Long-term average
5.0 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.1 hours spilling →
Clarington Brook 2 2.1 down 50% 100%
Rear of Pirelli Factory CSO
Overflow on sewer network
Company site name
Rear of Pirelli Factory CSO
EA ID / permit
UUP01638 · 017680351
Outlet location
NY3937053450 (OS grid reference) · View on Apple Maps
WFD catchment
Caldew d/s Caldbeck (GB102076073880)
2024 spills / hours
17 / 12
Long-term average
17.6 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2.1 hours spilling →
River Caldew 5 2.1 down 71% 100%
Edleston Road No 2 CSO
Overflow on sewer network
Company site name
EDLESTON ROAD No1 CSO
EA ID / permit
UUP00692 · 01CRE0040
Outlet location
SJ7052055320 (OS grid reference) · View on Apple Maps
WFD catchment
Valley Brook (Englesea Brook to Weaver) (GB112068055310)
2024 spills / hours
27 / 13
Long-term average
19.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.1 hours spilling →
Valley Brook 6 2.1 down 78% 94%
Palmerston Street CSO 289AL MAN0401
Overflow on sewer network
Company site name
Palmerston Street CSO
EA ID / permit
UUP01504 · 016983279
Outlet location
SJ8589097990 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Lumb Brook to Irwell) (GB112069061152)
2024 spills / hours
1 / 0.1
Long-term average
1.7 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.0 hours spilling →
The River Medlock 1 2.0 no change 100%
29 Cresswellshawe Rd A CSO 13567
Overflow on sewer network
Company site name
29 Cresswellshawe Road (Overflow A) CSO
EA ID / permit
UUP00029 · 016892427
Outlet location
SJ7981156068 (OS grid reference) · View on Apple Maps
WFD catchment
Kidsgrove Stream (including Day Green Stream) (GB112068055390)
2024 spills / hours
39 / 43
Long-term average
78.4 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2.0 hours spilling →
Cresswellshawe Brk via SWS 12 2.0 down 69% 100%
Calf Hall Road CSO
Overflow on sewer network
Company site name
Calf Hall Road CSO
EA ID / permit
UUP00394 · 017190815
Outlet location
SD8746046640 (OS grid reference) · View on Apple Maps
WFD catchment
Stock Beck (GB112071065540)
2024 spills / hours
5 / 2.0
Long-term average
5.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.9 hours spilling →
Calf Hall Beck 7 1.9 up 40% 100%
O/S 65 Dover Road CSO 381P8
Overflow on sewer network
Company site name
O/s 65 Dover Road CSO
EA ID / permit
UUP01425 · 01SEF0057
Outlet location
SD3302013220 (OS grid reference) · View on Apple Maps
WFD catchment
Three Pool's Waterway (GB112070064830)
2024 spills / hours
6 / 3.5
Long-term average
7.2 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.9 hours spilling →
Sandy Brook 5 1.9 down 17% 100%
Tbc
Overflow on sewer network
Company site name
158 Middleton Road CSO (131V4)
EA ID / permit
UUP02251 · Unpermitted
Outlet location
SJ7494461000 (OS grid reference) · View on Apple Maps
WFD catchment
Croco (GB112068055460)
2024 spills / hours
1 / 0.7
Long-term average
3.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.9 hours spilling →
Croco 5 1.9 up 400% 99%
Dooley Drive CSO/
Overflow on sewer network
Company site name
Dooley Drive Combined Sewer Overflow (381N6) (SEF0065) ( Emergency Overflow for 38006 – Copy Lane Pumping Station
EA ID / permit
UUP00649 · 016997071
Outlet location
SJ3697599833 (OS grid reference) · View on Apple Maps
WFD catchment
Alt US Bull Bridge (GB112069061441)
2024 spills / hours
0 / 0.0
Long-term average
1.9 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.9 hours spilling →
Moor Hey Brook tributary of the River Alt 1 1.9 up from 0 100%
Great Corby Syphon CSO (10C88)
Overflow on sewer network
Company site name
Great Corby Syphon CSO
EA ID / permit
UUP00840 · 01CAR0018
Outlet location
NY4678055160 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - Eamont to tidal (GB102076073940)
2024 spills / hours
2 / 2.6
Long-term average
2.7 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.9 hours spilling →
River Eden 6 1.9 up 200% 100%
Greystoke WwTW
Inlet overflow at sewage works
Sewage works
Greystoke
Company site name
GREYSTOKE WwTW
EA ID / permit
UUP00863 · 017670101
Outlet location
NY4459031190 (OS grid reference) · View on Apple Maps
WFD catchment
Petteril u/s M6 (GB102076073992)
2024 spills / hours
11 / 4.4
Long-term average
9.2 spills a year (monitored since 2020)
Investigation
Operational investigation ongoing
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 1.9 hours spilling →
River Petteril 5 1.9 down 55% 100%
Thursby STW
Inlet overflow at sewage works
Sewage works
Thursby
Company site name
THURSBY WwTW
EA ID / permit
UUP01940 · 017570018
Outlet location
NY3173050340 (OS grid reference) · View on Apple Maps
WFD catchment
Wampool (Upper) (GB102075073410)
2024 spills / hours
25 / 238
Long-term average
65.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 1.8 hours spilling →
Matty Beck 5 1.8 down 80% 100%
Castle Inn Road Mossley CSO
Overflow on sewer network
Company site name
Castle Inn Road (Mossley) Combined Sewer Overflow (Site ID 13531) (CON0034)
EA ID / permit
UUP00422 · 016892193
Outlet location
SJ8833061430 (OS grid reference) · View on Apple Maps
WFD catchment
Biddulph Brook (GB112068055360)
2024 spills / hours
0 / 0.0
Long-term average
7.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.8 hours spilling →
Trib of Dane-in-Shaw Brook 2 1.8 up from 0 100%
Rickerby CSO
Overflow on sewer network
Company site name
Rickerbys CSO
EA ID / permit
UUP01653 · 017680296
Outlet location
NY3997055031 (OS grid reference) · View on Apple Maps
WFD catchment
Caldew d/s Caldbeck (GB102076073880)
2024 spills / hours
1 / 4.6
Long-term average
1.2 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.8 hours spilling →
River Caldew 4 1.8 up 300% 100%
Balfour Road CSO
Overflow on sewer network
Company site name
Balfour Road CSO
EA ID / permit
UUP00170 · 01TRA0033
Outlet location
SJ7696089540 (OS grid reference) · View on Apple Maps
WFD catchment
Timperley Brook (GB112069061260)
2024 spills / hours
1 / 0.3
Long-term average
2.6 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.8 hours spilling →
Timperley Brook 3 1.8 up 200% 100%
Manchester Old Road CSO
Overflow on sewer network
Company site name
Manchester Old Road CSO
EA ID / permit
UUP01227 · 016982916
Outlet location
SD8444004740 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
4 / 2.1
Long-term average
4.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.8 hours spilling →
River Irk 3 1.8 down 25% 100%
Daresbury Combined Sewer Overflow
Overflow on sewer network
Company site name
Daresbury CSO
EA ID / permit
UUP00615 · 016921415
Outlet location
SJ5784483338 (OS grid reference) · View on Apple Maps
WFD catchment
Keckwick Brook (GB112068060520)
2024 spills / hours
8 / 1.5
Long-term average
7.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.8 hours spilling →
Ditch Tributary River Mersey 6 1.8 down 25% 97%
Waters Green (Dams Valley) CSO
Overflow on sewer network
Company site name
Waters Green (Dams Valley) CSO
EA ID / permit
UUP02048 · 01MAC0065
Outlet location
SJ9195073552 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (Source to Dean) (GB112069061320)
2024 spills / hours
6 / 1.1
Long-term average
9.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.8 hours spilling →
River Bollin 5 1.8 down 17% 100%
Off Jack Lane
Overflow on sewer network
Company site name
Jack Lane CSO
EA ID / permit
UUP01443 · 01VRY0066
Outlet location
SJ6610069200 (OS grid reference) · View on Apple Maps
WFD catchment
Dane (Wheelock to Weaver) (GB112068060470)
2024 spills / hours
4 / 1.3
Long-term average
4.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.7 hours spilling →
Trib of Peckmill Brook 6 1.7 up 50% 100%
Lever Street NO1 CSO
Overflow on sewer network
Company site name
Lever Street Number 1 CSO
EA ID / permit
UUP01136 · 016983261
Outlet location
SD7196007831 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
2 / 0.3
Long-term average
37.6 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.7 hours spilling →
A Culverted Section Jenny Beck 5 1.7 up 150% 82%
School Lane/Lodge Lane CSO
Overflow on sewer network
Company site name
School Lane/Lodge Lane CSO
EA ID / permit
UUP01728 · 01VRY0061
Outlet location
SJ6473071330 (OS grid reference) · View on Apple Maps
WFD catchment
Weaver (Winsford Flashes to Dane) (GB112068060463)
2024 spills / hours
2 / 0.2
Long-term average
2.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 1.7 hours spilling →
River Weaver 2 1.7 no change 99%
Tbc
Overflow on sewer network
Company site name
Wakefield Road CSO (449LF)
EA ID / permit
UUP02246 · Permit applied for
Outlet location
SJ9741499922 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
6 / 2.8
Long-term average
5.0 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 1.7 hours spilling →
River Tame 4 1.7 down 33% 79%
Billinge Higher End SPS
Overflow on sewer network
Company site name
Billinge Road/Victoria Street CSO
EA ID / permit
UUP00236 · 017081132
Outlet location
SD5328003840 (OS grid reference) · View on Apple Maps
WFD catchment
Smithy Brook (GB112070061600)
2024 spills / hours
0 / 0.0
Long-term average
3.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.7 hours spilling →
Smithy Brook 4 1.7 up from 0 100%
Church Street/Parliament Street CSO
Overflow on sewer network
Company site name
CHURCH STREET / PARLIAMENT STREEET CSO
EA ID / permit
UUP00488 · 01BBN0122
Outlet location
SD6928022180 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - headwaters to conf Davy Field Bk (GB112071065240)
2024 spills / hours
4 / 0.9
Long-term average
7.7 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1.7 hours spilling →
Culverted Section River Darwen 7 1.7 up 75% 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.