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
Park Lane CSO 50098
Overflow on sewer network
Company site name
Park Lane CSO
EA ID / permit
UUP01508 · 016993708
Outlet location
SJ6725099700 (OS grid reference) · View on Apple Maps
WFD catchment
Bedford Brook (GB112069060810)
2024 spills / hours
65 / 542
Long-term average
69.4 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 186 hours spilling →
Bedford Brook Trib Glaze Brook 23 186 down 65% 99%
Hope Street Combined Sewer Overflow
Overflow on sewer network
Company site name
Hope Street CSO
EA ID / permit
UUP01964 · 016982763
Outlet location
SJ8880690266 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
90 / 244
Long-term average
101.2 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 184 hours spilling →
River Mersey 84 184 down 7% 99%
Skelton STW
Inlet overflow at sewage works
Sewage works
Skelton
Company site name
SKELTON WwTW
EA ID / permit
UUP01764 · 017670116
Outlet location
NY4345036380 (OS grid reference) · View on Apple Maps
WFD catchment
Ive (GB102076073760)
2024 spills / hours
78 / 336
Long-term average
77.0 spills a year (monitored since 2021)
High-spill reason (company)
Performance - SW Infiltration
Monitor below 90%
Comms failure / issue · Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 183 hours spilling →
Trib Grise Beck 45 183 down 42% 82%
Dukinfield WwTW
Inlet overflow at sewage works
Sewage works
Dukinfield
Company site name
DUKINFIELD WwTW
EA ID / permit
UUP00665 · 016940087
Outlet location
SJ9326096730 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
24 / 93
Long-term average
38.3 spills a year (monitored since 2021)
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 183 hours spilling →
River Tame 51 183 up 113% 100%
Winsford Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Winsford
Company site name
WINSFORD WwTW
EA ID / permit
UUP02146 · 016810116
Outlet location
SJ6542967426 (OS grid reference) · View on Apple Maps
WFD catchment
Weaver (Winsford Flashes to Dane) (GB112068060463)
2024 spills / hours
45 / 240
Long-term average
50.8 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 183 hours spilling →
River Weaver 32 183 down 29% 100%
Astley Bridge CSO 071WP
Overflow on sewer network
Company site name
Astley Bridge Combined Sewer Overflow (Site ID 071WP) (BOL0056)
EA ID / permit
UUP00154 · 016950340
Outlet location
SD7152011200 (OS grid reference) · View on Apple Maps
WFD catchment
Astley Brook (Irwell) (GB112069064560)
2024 spills / hours
130 / 453
Long-term average
126.8 spills a year (monitored since 2018)
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 182 hours spilling →
Astley Brook 47 182 down 64% 100%
Willow Lane Sewage Pumping Station
Storm discharge at pumping station
Company site name
Willow Lane Sewage P/S (25032)
EA ID / permit
UUP02134 · 017280342
Outlet location
SD4665962201 (OS grid reference) · View on Apple Maps
WFD catchment
LUNE - transitional (GB531207212100)
Bathing water
Morecambe South
Shellfish water
Lune (Broadfleet and Plover Scar)
2024 spills / hours
31 / 123
Long-term average
30.6 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 182 hours spilling →
Lune Estuary 30 182 down 3% 100%
Oakmere Pumping Station
Storm discharge at pumping station
Company site name
Oakmere Pumping Station
EA ID / permit
UUP01434 · EPRMB3297NU
Outlet location
SJ5683568945 (OS grid reference) · View on Apple Maps
WFD catchment
Cuddington Brook (Source to Crowton Brook) (GB112068060480)
2024 spills / hours
51 / 501
Long-term average
37.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 181 hours spilling →
Fir Brook 23 181 down 55% 100%
Partington WwTW
Storm tank at sewage works
Sewage works
Partington
Company site name
PARTINGTON WwTW
EA ID / permit
UUP01522 · 016940148
Outlet location
SJ7052090860 (OS grid reference) · View on Apple Maps
WFD catchment
Sinderland Brook (GB112069060980)
2024 spills / hours
38 / 169
Long-term average
50.2 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 181 hours spilling →
Red Brook 40 181 up 5% 96%
Lindred Road CSO
Overflow on sewer network
Company site name
Lindred Road CSO
EA ID / permit
UUP01148 · 01PEN0056
Outlet location
SD8433037340 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
43 / 199
Long-term average
96.6 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 181 hours spilling →
Pendle Water 34 181 down 21% 100%
Carr Mill Street CSO
Overflow on sewer network
Company site name
Carr Mill Street/Hud Hey Road CSO
EA ID / permit
UUP00409 · 016993764
Outlet location
SD7858024380 (OS grid reference) · View on Apple Maps
WFD catchment
Ogden (GB112069064650)
2024 spills / hours
34 / 179
Long-term average
59.2 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 180 hours spilling →
Clvrt'D Section Swinnel Brook 43 180 up 26% 100%
St Annes Square CSO
Overflow on sewer network
Company site name
St Anne's Square
EA ID / permit
UUP01812 · 016982634
Outlet location
SD9861907880 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069064741)
2024 spills / hours
61 / 277
Long-term average
84.7 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 180 hours spilling →
River Tame 42 180 down 31% 99%
Arnside Promenade Pumping Station
Storm discharge at pumping station
Company site name
Arnside Promenade Pumping Station (Site ID 39042) (LAK0002)
EA ID / permit
UUP00134 · 017370203
Outlet location
SD4573078950 (OS grid reference) · View on Apple Maps
WFD catchment
KENT (GB531207312000)
2024 spills / hours
47 / 201
Long-term average
31.5 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 179 hours spilling →
R. Kent Estuary, Morecambe Bay 51 179 up 9% 100%
Ravensmoor Pumping Station
Storm discharge at pumping station
Company site name
Ravensmoor PS
EA ID / permit
UUP00168 · 016810291
Outlet location
SJ6185050450 (OS grid reference) · View on Apple Maps
WFD catchment
Edleston Brook (GB112068055250)
2024 spills / hours
50 / 176
Long-term average
43.2 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 178 hours spilling →
Trib River Weaver 31 178 down 38% 98%
Tame Street/Park Road CSO
Overflow on sewer network
Company site name
Tame Street/Park Road CSO
EA ID / permit
UUP01898 · 01TAM0109
Outlet location
SJ9539098160 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
21 / 110
Long-term average
35.5 spills a year (monitored since 2024)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Sensor failure / issue · Resolved - January after reporting year
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 178 hours spilling →
River Tame 50 178 up 138% 86%
Wastdale Drive CSO
Overflow on sewer network
Company site name
Wastdale Drive CSO
EA ID / permit
UUP02034 · 016892255
Outlet location
SJ2492090200 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
Bathing water
Moreton
Shellfish water
North Wirral (West)
2024 spills / hours
46 / 210
Long-term average
47.1 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 178 hours spilling →
Arrowe Brook 35 178 down 24% 100%
Mickle Trafford Pumping Station
Storm discharge at pumping station
Company site name
Mickle Trafford PS
EA ID / permit
UUP01292 · 016892313
Outlet location
SJ4408070700 (OS grid reference) · View on Apple Maps
WFD catchment
Stanney Mill Brook (GB112068060260)
2024 spills / hours
72 / 447
Long-term average
40.8 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 178 hours spilling →
Trib of Stanney Mill Brook 31 178 down 57% 98%
Milnthorpe Sewage PS Mlnth
Storm discharge at pumping station
Company site name
Milnthorpe Sewage PS
EA ID / permit
UUP01326 · 017380339
Outlet location
SD4939081400 (OS grid reference) · View on Apple Maps
WFD catchment
Bela (GB112073071070)
2024 spills / hours
27 / 248
Long-term average
56.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 178 hours spilling →
River Bela 29 178 up 7% 100%
Grange Pumping Station
Storm discharge at pumping station
Company site name
Grange PS
EA ID / permit
UUP00827 · 017380194
Outlet location
SD4125078160 (OS grid reference) · View on Apple Maps
WFD catchment
KENT (GB531207312000)
2024 spills / hours
25 / 69
Long-term average
41.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 178 hours spilling →
Kent Estuary 27 178 up 8% 99%
Ross Lave Lane CSO
Overflow on sewer network
Company site name
Ross Lave Lane CSO
EA ID / permit
UUP01687 · 016983312
Outlet location
SJ9159094450 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
43 / 137
Long-term average
64.0 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 178 hours spilling →
Unnamed Trib of Denton Brook 65 178 up 51% 100%
Halton East Sewage Pumping Station
Storm discharge at pumping station
Company site name
Halton East sewage pumping station (Site ID HALTN) (LAN0060
EA ID / permit
UUP00888 · 01LAN0060
Outlet location
SD5030064700 (OS grid reference) · View on Apple Maps
WFD catchment
Lune - conf Wenning to tidal (GB112072065980)
2024 spills / hours
92 / 215
Long-term average
72.4 spills a year (monitored since 2017)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 177 hours spilling →
River Lune 87 177 down 5% 100%
Oswaldtwistle CSO
Overflow on sewer network
Company site name
Oswaldwistle CSO
EA ID / permit
UUP01481 · 017160125
Outlet location
SD7366028508 (OS grid reference) · View on Apple Maps
WFD catchment
Hyndburn Brook - Upper (GB112071065050)
2024 spills / hours
52 / 187
Long-term average
61.8 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 177 hours spilling →
White Ash Brook 54 177 up 4% 100%
Lostock Road CSO
Overflow on sewer network
Company site name
Lostock Road CSO
EA ID / permit
UUP01192 · NPSWQD010711
Outlet location
SJ7707095780 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
55 / 124
Long-term average
63.8 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 176 hours spilling →
Bent Lanes Brook via Sw Sewer 54 176 down 2% 100%
Ravens Bridge Pumping Station
Storm discharge at pumping station
Company site name
Ravens Bridge Sewage PS
EA ID / permit
UUP00801 · 016920504
Outlet location
SJ6756096090 (OS grid reference) · View on Apple Maps
WFD catchment
Glaze (GB112069061420)
2024 spills / hours
54 / 290
Long-term average
54.0 spills a year (monitored since 2021)
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 174 hours spilling →
River Glaze 36 174 down 33% 100%
Berisfords Compound CSO 131G3
Overflow on sewer network
Company site name
BERISFORDS COMPOUND CSO
EA ID / permit
UUP00223 · 01CON0029
Outlet location
SJ8650063570 (OS grid reference) · View on Apple Maps
WFD catchment
Biddulph Brook (GB112068055360)
2024 spills / hours
68 / 162
Long-term average
62.3 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 174 hours spilling →
Dane in Shaw Brook 58 174 down 15% 100%
Cedar Lane CSO (31031)
Overflow on sewer network
Company site name
Newhey Shaw Main Outfall CSO
EA ID / permit
UUP01748 · 01OLD0150
Outlet location
SD9313011230 (OS grid reference) · View on Apple Maps
WFD catchment
Beal (GB112069064690)
2024 spills / hours
25 / 255
Long-term average
34.2 spills a year (monitored since 2020)
Monitor below 90%
Comms failure / issue · Resolved - Oct
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 174 hours spilling →
River Beal 20 174 down 20% 87%
Red Brow Wood CSO (42076) (STH0071)
Overflow on sewer network
Company site name
Red Brow Wood CSO
EA ID / permit
UUP01640 · NPSWQD010717
Outlet location
SJ5770494436 (OS grid reference) · View on Apple Maps
WFD catchment
Millingford (Newton) Brook (GB112069061220)
2024 spills / hours
55 / 310
Long-term average
61.6 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 174 hours spilling →
Sankey Canal 42 174 down 24% 99%
Clayton Bridge
Overflow on sewer network
Company site name
Clayton Bridge CSO
EA ID / permit
UUP00495 · 01TAM0004
Outlet location
SJ8909099420 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Lumb Brook to Irwell) (GB112069061152)
2024 spills / hours
65 / 530
Long-term average
64.5 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Comms failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 173 hours spilling →
River Medlock 42 173 down 35% 84%
Glassonby Village WwTW
Inlet overflow at sewage works
Sewage works
Glassonby Village
Company site name
GLASSONBY VILLAGE WwTW
EA ID / permit
UUP00799 · 017680299
Outlet location
NY5774439384 (OS grid reference) · View on Apple Maps
WFD catchment
Glassonby Beck (GB102076073820)
2024 spills / hours
78 / 427
Long-term average
106.0 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Monitor below 90%
Sensor failure / issue · Resolved - Aug
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 173 hours spilling →
Glassonby Beck 82 173 up 5% 90%
Weeton Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Weeton
Company site name
WEETON WwTW
EA ID / permit
UUP02066 · 017260056
Outlet location
SD3828034840 (OS grid reference) · View on Apple Maps
WFD catchment
Hillylaid Pool - Tidal Wyre (GB112072066120)
Bathing water
Fleetwood
2024 spills / hours
187 / 545
Long-term average
138.0 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 172 hours spilling →
Unnamed tributary of Main Dyke 89 172 down 52% 100%
Adj Duxbury Mill P.S. CSO Id 12006
Overflow on sewer network
Company site name
Adjacent Duxbury Mill Pumping Station Combined Sewer Overflow (CHR0024)
EA ID / permit
UUP00081 · 01CHR0024
Outlet location
SD5882015660 (OS grid reference) · View on Apple Maps
WFD catchment
Yarrow US Big Lodge Water (GB112070064951)
2024 spills / hours
72 / 237
Long-term average
66.3 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 171 hours spilling →
River Yarrow 61 171 down 15% 100%
New Street Combined Sewer Overflow
Overflow on sewer network
Company site name
NEW STREET CSO
EA ID / permit
UUP01380 · 01BRY0008
Outlet location
SD7779012790 (OS grid reference) · View on Apple Maps
WFD catchment
Kirklees Brook (GB112069064610)
2024 spills / hours
78 / 158
Long-term average
113.7 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 170 hours spilling →
Black Brook 68 170 down 13% 99%
Bolton Rd Canute Street CSO
Overflow on sewer network
Company site name
Bolton Road/Canute Street CSO
EA ID / permit
UUP00269 · NPSWQD010704
Outlet location
SD7792006830 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Roch to Croal) (GB112069060840)
2024 spills / hours
99 / 289
Long-term average
113.4 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 170 hours spilling →
River Irwell 72 170 down 27% 98%
Chisworth Marple Road Wwnps
Storm discharge at pumping station
Company site name
Chisworth (Marple Rd) WasteWater Network PS
EA ID / permit
UUP00467 · 016982818
Outlet location
SK0003092290 (OS grid reference) · View on Apple Maps
WFD catchment
Etherow (Glossop Brook to Goyt) (GB112069061050)
2024 spills / hours
117 / 538
Long-term average
89.3 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 170 hours spilling →
Chisworth Brook 54 170 down 54% 97%
Sheridan Way CSO 44179
Overflow on sewer network
Company site name
Sheridan Way CSO
EA ID / permit
UUP01752 · 01TAM0015
Outlet location
SJ9271493544 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
25 / 52
Long-term average
50.4 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
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 170 hours spilling →
River Tame 48 170 up 92% 100%
Bongs Valley Pumping Station
Storm discharge at pumping station
Company site name
Bongs Valley PS
EA ID / permit
UUP00280 · 016983106
Outlet location
SJ9321089140 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Etherow to Mersey) (GB112069061000)
2024 spills / hours
29 / 94
Long-term average
48.0 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 170 hours spilling →
River Goyt 54 170 up 86% 100%
West Bradford PS
Storm discharge at pumping station
Company site name
West Bradford WwNPS
EA ID / permit
UUP02075 · 01RIB0031
Outlet location
SD7455044190 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble DS Stock Beck (GB112071065612)
Bathing water
River Ribble at Edisford Bridge
2024 spills / hours
55 / 266
Long-term average
52.5 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 170 hours spilling →
West Bradford Brook 28 170 down 49% 100%
A6 Junction of Churchtown CSO
Overflow on sewer network
Company site name
A6 Junction of Churchtown CSO
EA ID / permit
UUP00428 · 017260030
Outlet location
SD4887543063 (OS grid reference) · View on Apple Maps
WFD catchment
Wyre DS Grizedale Brook confl (GB112072065822)
2024 spills / hours
49 / 213
Long-term average
52.4 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 169 hours spilling →
River Wyre 40 169 down 18% 100%
Opp 76 Burnley Road CSO
Overflow on sewer network
EA ID / permit
UUP01466 · 01BUR0021
Outlet location
SD7960033720 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
126 / 234
Long-term average
61.4 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 169 hours spilling →
River Calder 93 169 down 26% 100%
Fazakerley WwTW
Storm tank at sewage works
Sewage works
Fazakerley
Company site name
FAZAKERLEY WwTW
EA ID / permit
UUP00724 · 016930112
Outlet location
SJ3958096340 (OS grid reference) · View on Apple Maps
WFD catchment
Alt (GB112069060580)
2024 spills / hours
67 / 447
Long-term average
61.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 168 hours spilling →
River Alt 18 168 down 73% 100%
Bacup Road/Falbarn Fold CSO
Overflow on sewer network
Company site name
Bacup Road/Markross Street CSO
EA ID / permit
UUP00166 · 016993910
Outlet location
SD8136022670 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Cowpe Bk to Rossendale STW) (GB112069064641)
2024 spills / hours
85 / 481
Long-term average
87.5 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 168 hours spilling →
River Irwell 49 168 down 42% 100%
Singleton Pumping Station
Storm discharge at pumping station
Company site name
Singleton PS
EA ID / permit
UUP01759 · 017290649
Outlet location
SD3826037940 (OS grid reference) · View on Apple Maps
WFD catchment
Hillylaid Pool - Tidal Wyre (GB112072066120)
Bathing water
Fleetwood
2024 spills / hours
41 / 243
Long-term average
35.2 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 168 hours spilling →
Tributary of Main Dyke 32 168 down 22% 99%
Horwich Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Horwich
Company site name
HORWICH WwTW
EA ID / permit
UUP00992 · 017050012
Outlet location
SD6264010763 (OS grid reference) · View on Apple Maps
WFD catchment
Douglas - Upper (GB112070064850)
2024 spills / hours
25 / 255
Long-term average
48.5 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 168 hours spilling →
Pearl Brook 19 168 down 24% 98%
Bowden Lane CSO 211FL
Overflow on sewer network
Company site name
Bowden Lane CSO
EA ID / permit
UUP00290 · 016940364
Outlet location
SK0597181521 (OS grid reference) · View on Apple Maps
WFD catchment
Black Brook (Upper Mersey) (GB112069060910)
2024 spills / hours
62 / 247
Long-term average
78.4 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 168 hours spilling →
Black Brook 59 168 down 5% 100%
York Ave/Crawford Avenue CSO
Overflow on sewer network
Company site name
York Avenue CSO
EA ID / permit
UUP02185 · 016993565
Outlet location
SD6872902584 (OS grid reference) · View on Apple Maps
WFD catchment
Hindsford Brook (GB112069060810)
2024 spills / hours
0 / 0.0
Long-term average
79.3 spills a year (monitored since 2021)
High-spill reason (company)
Data collection - Tidal / river inundation
Monitor below 90%
Installation set-up/design issue · Resolved - May
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 167 hours spilling →
Hindsford Brook/Shakerley Broo 35 167 up from 0 70%
Dunham Massey Outfall CSO (451SS)
Overflow on sewer network
Company site name
Dunham Massey Outfall SSO
EA ID / permit
UUP00668 · 01TRA0079
Outlet location
SJ7269087541 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (Ashley Mill to Manchester Ship Canal) (GB112069061382)
2024 spills / hours
47 / 176
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 167 hours spilling →
River Bollin via SWS 43 167 down 9% 95%
Langwathby Combined Sewer Overflow
Storm discharge at pumping station
Company site name
Langwathby CSO
EA ID / permit
UUP01110 · EPRRP3420XG
Outlet location
NY5652534220 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - Eamont to tidal (GB102076073940)
2024 spills / hours
83 / 282
Long-term average
87.3 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 167 hours spilling →
River Eden 54 167 down 35% 100%
Daub Hall Lane CSO 403CW
Overflow on sewer network
Company site name
Daub Hall Lane, Walton-le-Dale CSO
EA ID / permit
UUP00618 · EPRKB3093VQ
Outlet location
SD5910027280 (OS grid reference) · View on Apple Maps
WFD catchment
Many Brooks (GB112071065280)
2024 spills / hours
95 / 277
Long-term average
88.3 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 166 hours spilling →
Black Brook 67 166 down 29% 100%
Tanpits Road CSO
Overflow on sewer network
Company site name
Tanpits Road
EA ID / permit
UUP01900 · 016982617
Outlet location
SD7973010660 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Rossendale STW to Roch) (GB112069064620)
2024 spills / hours
51 / 172
Long-term average
59.9 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 166 hours spilling →
River Irwell 53 166 up 4% 100%
Waters Meeting Road CSO 073KZ
Overflow on sewer network
Company site name
Waters meeting Road CSO
EA ID / permit
UUP02049 · 016982261
Outlet location
SD7196011020 (OS grid reference) · View on Apple Maps
WFD catchment
Tonge (GB112069064530)
2024 spills / hours
66 / 128
Long-term average
51.0 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 166 hours spilling →
River Tonge 55 166 down 17% 99%

Sewage treatment works

Storm tanks and inlet overflows at each United Utilities sewage works. The figures are 2025 spills.

← All water companies · Contains Environment Agency data licensed under the Open Government Licence v3.0. How to read the data.