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
Staveley WwTW
Storm tank at sewage works
Sewage works
Staveley
Company site name
STAVELEY WwTW
EA ID / permit
UUP01854 · 017370061
Outlet location
SD4827098020 (OS grid reference) · View on Apple Maps
WFD catchment
Kent - conf Gowan to conf Sprint (GB112073071380)
2024 spills / hours
174 / 3,422
Long-term average
195.8 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 3,395 hours spilling →
River Kent 167 3,395 down 4% 100%
Gleaston Castle CSO
Overflow on sewer network
Company site name
Gleaston Castle CSO
EA ID / permit
UUP00803 · 017480365
Outlet location
SD2607072140 (OS grid reference) · View on Apple Maps
WFD catchment
Deep Meadows Beck (GB112073071150)
2024 spills / hours
191 / 4,518
Long-term average
149.0 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3,206 hours spilling →
Gleaston Beck 139 3,206 down 27% 93%
Pica STW
Storm tank at sewage works
Sewage works
Pica
Company site name
PICA WwTW
EA ID / permit
UUP01548 · 017470038
Outlet location
NY0232022860 (OS grid reference) · View on Apple Maps
WFD catchment
Lowca Beck (GB112074070040)
2024 spills / hours
56 / 695
Long-term average
81.3 spills a year (monitored since 2022)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2,589 hours spilling →
Dyan Beck 152 2,589 up 171% 96%
Blennerhasset Ww Pumping Station
Storm discharge at pumping station
Company site name
Blennerhassett Ww PS
EA ID / permit
UUP00259 · 017570109
Outlet location
NY1753041430 (OS grid reference) · View on Apple Maps
WFD catchment
Ellen (middle) (GB112075073650)
2024 spills / hours
199 / 3,018
Long-term average
211.3 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2,508 hours spilling →
River Ellen 172 2,508 down 14% 96%
Ingleton STW
Storm tank at sewage works
Sewage works
Ingleton
Company site name
INGLETON WwTW
EA ID / permit
UUP01022 · 017260005
Outlet location
SD6868072620 (OS grid reference) · View on Apple Maps
WFD catchment
Greta (GB112072071610)
2024 spills / hours
174 / 2,962
Long-term average
181.7 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2,446 hours spilling →
River Greta 144 2,446 down 17% 100%
Over Kellet WwTW
Storm tank at sewage works
Sewage works
Over Kellet
Company site name
OVER KELLET WwTW
EA ID / permit
UUP01491 · 017370075
Outlet location
SD5164070240 (OS grid reference) · View on Apple Maps
WFD catchment
Keer - Lower (GB112073064430)
Shellfish water
Morecambe Bay East
2024 spills / hours
156 / 1,907
Long-term average
150.7 spills a year (monitored since 2017)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2,402 hours spilling →
Trib River Keer 134 2,402 down 14% 100%
Cockermouth WwTW
Storm tank at sewage works
Sewage works
Cockermouth
Company site name
COCKERMOUTH WwTW
EA ID / permit
UUP00519 · 017570031
Outlet location
NY1024031140 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent - conf Cocker to tidal (GB112075070520)
2024 spills / hours
165 / 3,079
Long-term average
164.2 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2,354 hours spilling →
River Derwent 133 2,354 down 19% 99%
Barton Waste Water Treatment Works
Storm tank at sewage works
Sewage works
Barton
Company site name
BARTON WwTW
EA ID / permit
UUP00200 · 017260043
Outlet location
SD5147035720 (OS grid reference) · View on Apple Maps
WFD catchment
Barton (Westfield) Brook (GB112072065800)
2024 spills / hours
170 / 2,640
Long-term average
156.8 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 2,207 hours spilling →
Barton Brook 147 2,207 down 14% 100%
Kirkby Stephen WwTW
Storm tank at sewage works
Sewage works
Kirkby Stephen
Company site name
Kirkby Stephen WwTW
EA ID / permit
UUP01080 · 017670013
Outlet location
NY7717010460 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - headwaters to Scandal Beck (GB102076070590)
2024 spills / hours
142 / 2,582
Long-term average
151.8 spills a year (monitored since 2020)
High-spill reason (company)
Data collection - EDM non-representative location
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2,170 hours spilling →
River Eden 119 2,170 down 16% 100%
Embleton WwTW
Storm tank at sewage works
Sewage works
Embleton
Company site name
EMBLETON WwTW
EA ID / permit
UUP00704 · 017570038
Outlet location
NY1795030530 (OS grid reference) · View on Apple Maps
WFD catchment
Wythop Beck (GB112075070500)
2024 spills / hours
158 / 2,975
Long-term average
181.3 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 2,044 hours spilling →
Trib Dubwath Beck 113 2,044 down 28% 93%
Greystoke PS
Storm discharge at pumping station
Company site name
Greystoke Wastewater Process PS
EA ID / permit
UUP00862 · 017670163
Outlet location
NY4356030770 (OS grid reference) · View on Apple Maps
WFD catchment
Petteril u/s M6 (GB102076073992)
2024 spills / hours
139 / 2,221
Long-term average
137.8 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 2,003 hours spilling →
River North Petteril 121 2,003 down 13% 99%
Ecclestone Bridge CSO 12065
Overflow on sewer network
Company site name
Eccleston Bridge D/S CSO
EA ID / permit
UUP00685 · 017060128
Outlet location
SD5085017690 (OS grid reference) · View on Apple Maps
WFD catchment
Yarrow Culbeck Brook to tidal (GB112070064861)
2024 spills / hours
86 / 1,355
Long-term average
109.4 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 1,967 hours spilling →
River Yarrow 106 1,967 up 23% 100%
Waddington WwTW
Storm tank at sewage works
Sewage works
Waddington
Company site name
WADDINGTON WwTW
EA ID / permit
UUP02003 · 017160048
Outlet location
SD7230043050 (OS grid reference) · View on Apple Maps
WFD catchment
Bashall Brook (GB112071065520)
Bathing water
River Ribble at Edisford Bridge
2024 spills / hours
166 / 2,288
Long-term average
188.8 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 1,935 hours spilling →
Bashall Brook 145 1,935 down 13% 100%
Plumbland WwTW
Storm tank at sewage works
Sewage works
Plumbland
Company site name
Plumbland WwTW
EA ID / permit
UUP01555 · 017570072
Outlet location
NY1394040300 (OS grid reference) · View on Apple Maps
WFD catchment
Ellen (lower) (GB112075073640)
2024 spills / hours
174 / 2,439
Long-term average
267.4 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 1,928 hours spilling →
River Ellen 164 1,928 down 6% 98%
Crosby Garret WwTW
Inlet overflow at sewage works
Sewage works
Crosby Garret
Company site name
Crosby Garret WwTW
EA ID / permit
UUP00570 · 017670005
Outlet location
NY7277010050 (OS grid reference) · View on Apple Maps
WFD catchment
Blind Beck (GB102076070790)
2024 spills / hours
24 / 86
Long-term average
150.6 spills a year (monitored since 2019)
High-spill reason (company)
Performance - Asset configuration (e.g. PS/rising main/storm tanks)
Investigation
Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 1,922 hours spilling →
Crosby Garrett Beck 159 1,922 up 563% 92%
Shap PS
Storm discharge at pumping station
Company site name
Shap (Brackenber) WwNPS
EA ID / permit
UUP01741 · 017680338
Outlet location
NY5617014270 (OS grid reference) · View on Apple Maps
WFD catchment
Lowther (Upper) (GB102076070690)
2024 spills / hours
142 / 2,198
Long-term average
79.7 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Monitor below 90%
Sensor failure / issue · Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 1,907 hours spilling →
Docker Beck 118 1,907 down 17% 88%
Cark Tank No.1 Pumping Station
Storm discharge at pumping station
Company site name
Cark PS
EA ID / permit
UUP00402 · 017370205
Outlet location
SD3578076410 (OS grid reference) · View on Apple Maps
WFD catchment
Eea (GB112073071270)
2024 spills / hours
135 / 2,083
Long-term average
89.3 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 1,861 hours spilling →
River Eea 123 1,861 down 9% 99%
Austwick Pumping Station CRA0010
Storm discharge at pumping station
Company site name
Austwick SPS
EA ID / permit
UUP00160 · EPREP3526GE
Outlet location
SD7642067270 (OS grid reference) · View on Apple Maps
WFD catchment
Fen Beck (GB112072066090)
2024 spills / hours
117 / 2,156
Long-term average
95.1 spills a year (monitored since 2017)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1,842 hours spilling →
Trib Fen Beck via Drying Beds 97 1,842 down 17% 99%
Hawkshead Pumping Station LAK0107
Storm discharge at pumping station
Company site name
Hawkshead Pumping Station (Site ID HWKSH) (LAK0107)
EA ID / permit
UUP00919 · 017380284
Outlet location
SD3552797923 (OS grid reference) · View on Apple Maps
WFD catchment
Cunsey Beck/Black Beck (GB112073071400)
Bathing water
Windermere; Rayrigg Meadow
2024 spills / hours
158 / 2,551
Long-term average
141.9 spills a year (monitored since 2024)
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 1,825 hours spilling →
Black Beck 115 1,825 down 27% 99%
Laburnum Grove
Overflow on sewer network
Company site name
Laburnham Grove
EA ID / permit
UUP01095 · 01HAL0127
Outlet location
SJ5176782097 (OS grid reference) · View on Apple Maps
WFD catchment
Bridgewater Canal (GB71210001)
2024 spills / hours
4 / 0.7
Long-term average
104.0 spills a year (monitored since 2016)
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 1,772 hours spilling →
Willow Brook 102 1,772 up 2450% 94%
Coniston WwTW
Storm tank at sewage works
Sewage works
Coniston
Company site name
Coniston WwTW
EA ID / permit
UUP00534 · 017370035
Outlet location
SD3072097050 (OS grid reference) · View on Apple Maps
WFD catchment
Church Beck (GB112073071212)
Bathing water
Coniston Water; Boating Centre
2024 spills / hours
166 / 2,849
Long-term average
168.1 spills a year (monitored since 2017)
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 1,765 hours spilling →
Church Beck 131 1,765 down 21% 98%
Little Clifton STW
Storm tank at sewage works
Sewage works
Little Clifton
Company site name
LITTLE CLIFTON WwTW
EA ID / permit
UUP01152 · 017570045
Outlet location
NY0567029230 (OS grid reference) · View on Apple Maps
WFD catchment
Marron (GB112075070540)
2024 spills / hours
110 / 1,310
Long-term average
94.2 spills a year (monitored since 2021)
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, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 1,756 hours spilling →
River Marron 128 1,756 up 16% 95%
Burton Road Withington CSO 28056
Overflow on sewer network
Company site name
Burton Road (Withington) CSO
EA ID / permit
UUP00375 · 01MAN0237
Outlet location
SJ8346091621 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
96 / 2,089
Long-term average
23.4 spills a year (monitored since 2018)
High-spill reason (company)
Data collection - EDM non-representative location
Monitor below 90%
Sensor failure / issue · Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1,717 hours spilling →
River Mersey 75 1,717 down 22% 80%
Longton Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Longton
Company site name
LONGTON WwTW
EA ID / permit
UUP01181 · 017060019
Outlet location
SD4687025280 (OS grid reference) · View on Apple Maps
WFD catchment
Tarra Carr Gutter (GB112070064900)
Bathing water
St Annes
Shellfish water
Ribble
2024 spills / hours
149 / 1,973
Long-term average
150.8 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 1,688 hours spilling →
Tarra Carr Gutter 121 1,688 down 19% 100%
Nether Kellet WTW Nethk
Storm tank at sewage works
Sewage works
Nether Kellet Nethk
Company site name
NETHER KELLET WwTW
EA ID / permit
UUP01373 · 017370074
Outlet location
SD5018068160 (OS grid reference) · View on Apple Maps
WFD catchment
KENT - transitional (GB531207312000)
Shellfish water
Morecambe Bay East
2024 spills / hours
92 / 1,314
Long-term average
89.6 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 1,628 hours spilling →
Nether Beck, Trib River Keer 102 1,628 up 11% 100%
Dean Pumping Station
Storm discharge at pumping station
Company site name
Dean Ww PS
EA ID / permit
UUP00623 · 017570033
Outlet location
NY0665225052 (OS grid reference) · View on Apple Maps
WFD catchment
Marron (GB112075070540)
2024 spills / hours
137 / 1,609
Long-term average
137.2 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 1,611 hours spilling →
Near Stock Beck 145 1,611 up 6% 100%
Lock Lane Partington CSO
Overflow on sewer network
Company site name
Lock Lane CSO
EA ID / permit
UUP01163 · 01TRA0035
Outlet location
SJ7088091511 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey/ Manchester Ship Canal (Irwell/Manchester Ship Canal to Bollin) (GB112069061011)
2024 spills / hours
175 / 965
Long-term average
193.8 spills a year (monitored since 2019)
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 1,574 hours spilling →
Manchester Ship Canal 217 1,574 up 24% 95%
Billington WwTW
Storm tank at sewage works
Sewage works
Billington
Company site name
BILLINGTON WwTW
EA ID / permit
UUP00239 · 017160003
Outlet location
SD7160036600 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
151 / 1,871
Long-term average
170.0 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 1,551 hours spilling →
River Calder 124 1,551 down 18% 100%
Keekle Pumping Station
Storm discharge at pumping station
Company site name
Keekle PS
EA ID / permit
UUP01050 · 017470076
Outlet location
NY0050016170 (OS grid reference) · View on Apple Maps
WFD catchment
Keekle (lower) (GB112074070000)
Bathing water
Seascale
2024 spills / hours
135 / 1,068
Long-term average
148.1 spills a year (monitored since 2018)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 1,533 hours spilling →
River Keekle via a surface water sewer 147 1,533 up 9% 100%
Rochdale WwTW
Storm tank at sewage works
Sewage works
Rochdale
EA ID / permit
UUP01675 · 016950041
Outlet location
SD8817012380 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Spodden to Irwell) (GB112069064600)
2024 spills / hours
116 / 1,679
Long-term average
122.1 spills a year (monitored since 2019)
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 1,503 hours spilling →
River Roch 104 1,503 down 10% 100%
Great Orton WwTW (Grort)
Storm tank at sewage works
Sewage works
Great Orton
Company site name
GREAT ORTON WwTW
EA ID / permit
UUP00842 · 017670128
Outlet location
NY3332054490 (OS grid reference) · View on Apple Maps
WFD catchment
Powburgh Beck (GB102076073950)
2024 spills / hours
160 / 2,778
Long-term average
159.8 spills a year (monitored since 2020)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 1,461 hours spilling →
Roughton Beck 95 1,461 down 41% 95%
Field Head Pumping Station LAK0090
Storm discharge at pumping station
Company site name
Field Head Pumping Station (Site ID FLDHD) (LAK0090)
EA ID / permit
UUP00730 · 017380283
Outlet location
SD3660075500 (OS grid reference) · View on Apple Maps
WFD catchment
LEVEN - transitional (GB531207311900)
2024 spills / hours
182 / 2,514
Long-term average
157.6 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1,460 hours spilling →
Trib Windermoor Main Drain 101 1,460 down 45% 77%
Great Broughton WwTW
Storm tank at sewage works
Sewage works
Great Broughton
Company site name
GREAT BROUGHTON WwTW
EA ID / permit
UUP00837 · 017570041
Outlet location
NY0706030500 (OS grid reference) · View on Apple Maps
WFD catchment
Derwent - conf Cocker to tidal (GB112075070520)
2024 spills / hours
161 / 1,526
Long-term average
228.6 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 1,427 hours spilling →
River Derwent 161 1,427 no change 100%
Winton Pumping Station
Storm discharge at pumping station
Company site name
Winton PS
EA ID / permit
UUP02152 · 017670197
Outlet location
NY7760010530 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - headwaters to Scandal Beck (GB102076070590)
2024 spills / hours
187 / 2,932
Long-term average
165.5 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 1,427 hours spilling →
River Eden 140 1,427 down 25% 100%
Bromborough WwTW
Storm tank at sewage works
Sewage works
Bromborough
Company site name
BROMBOROUGH WwTW
EA ID / permit
UUP00335 · 016993398
Outlet location
SJ3471085640 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
187 / 2,537
Long-term average
181.2 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 1,426 hours spilling →
Mersey Estuary 122 1,426 down 35% 100%
Glossop STW
Storm tank at sewage works
Sewage works
Glossop
Company site name
GLOSSOP WwTW
EA ID / permit
UUP00809 · 016940172
Outlet location
SK0058094910 (OS grid reference) · View on Apple Maps
WFD catchment
Etherow (Glossop Brook to Goyt) (GB112069061050)
2024 spills / hours
141 / 1,674
Long-term average
146.0 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 1,411 hours spilling →
Trib River Etherow 102 1,411 down 28% 100%
Spark Bridge Pumping Station
Storm discharge at pumping station
Company site name
Spark Bridge Wastewater Network Pumping Station
EA ID / permit
UUP01799 · EPRBP3624XL
Outlet location
SD3068084701 (OS grid reference) · View on Apple Maps
WFD catchment
Crake (GB112073071190)
2024 spills / hours
123 / 1,675
Long-term average
112.8 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 1,409 hours spilling →
River Crake 98 1,409 down 20% 99%
Bolton Low Houses WwTW
Storm tank at sewage works
Sewage works
Bolton Low Houses
Company site name
BOLTON LOW HOUSES WwTW
EA ID / permit
UUP00267 · 017570012
Outlet location
NY2374044630 (OS grid reference) · View on Apple Maps
WFD catchment
Waver (GB102075073440)
2024 spills / hours
153 / 1,944
Long-term average
132.4 spills a year (monitored since 2021)
High-spill reason (company)
Performance - SW Infiltration
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 1,379 hours spilling →
River Waver 135 1,379 down 12% 96%
Hurst Green WwTW
Storm tank at sewage works
Sewage works
Hurst Green
Company site name
Hurst Green WwTW
EA ID / permit
UUP01003 · 017160040
Outlet location
SD6910037750 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble - conf Calder to tidal (GB112071065500)
2024 spills / hours
178 / 2,176
Long-term average
199.2 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 1,364 hours spilling →
Dean Brook 143 1,364 down 20% 100%
Near Sawrey WwTW Nears
Inlet overflow at sewage works
Sewage works
Near Sawrey Nears
Company site name
NEAR SAWREY WwTW
EA ID / permit
UUP01370 · 017370030
Outlet location
SD3660095110 (OS grid reference) · View on Apple Maps
WFD catchment
Cunsey Beck/Black Beck (GB112073071400)
Bathing water
Windermere; Lakeside YMCA
2024 spills / hours
86 / 1,617
Long-term average
100.0 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 1,353 hours spilling →
Cunsey Beck 75 1,353 down 13% 100%
Chapel-En-Le-Frith WwTW
Storm tank at sewage works
Sewage works
Chapel En Le Frith
Company site name
CHAPEL-EN-LE-FRITH WwTW
EA ID / permit
UUP00447 · 016940168
Outlet location
SK0481082020 (OS grid reference) · View on Apple Maps
WFD catchment
Black Brook (Upper Mersey) (GB112069060910)
2024 spills / hours
129 / 1,154
Long-term average
134.4 spills a year (monitored since 2018)
High-spill reason (company)
Performance - Asset configuration (e.g. PS/rising main/storm tanks)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 1,347 hours spilling →
Black Brook 107 1,347 down 17% 100%
Baycliff Pumping Station 39051
Storm discharge at pumping station
Company site name
Baycliffe PS
EA ID / permit
UUP00204 · 017370199
Outlet location
SD2905071910 (OS grid reference) · View on Apple Maps
WFD catchment
Morecambe Bay (GB641211171000)
Bathing water
Walney West Shore
Shellfish water
Morecambe Bay (Leven)
2024 spills / hours
88 / 1,338
Long-term average
81.7 spills a year (monitored since 2019)
High-spill reason (company)
Performance - SW Infiltration
Investigation
No investigation activity in reporting period
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 1,331 hours spilling →
Morcambe Bay Estuarine Waters 84 1,331 down 5% 100%
Waverton Pumping Station
Storm discharge at pumping station
Company site name
Waverton PS
EA ID / permit
UUP02062 · 017580266
Outlet location
NY2182047150 (OS grid reference) · View on Apple Maps
WFD catchment
Waver (GB102075073440)
2024 spills / hours
90 / 1,433
Long-term average
82.3 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 1,314 hours spilling →
River Waver 84 1,314 down 7% 100%
The Glen Combined Sewer Overflow
Overflow on sewer network
Company site name
The Glen CSO
EA ID / permit
UUP01920 · 016993608
Outlet location
SD8409021650 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Source to Whitewell Brook) (GB112069064660)
2024 spills / hours
152 / 1,545
Long-term average
149.8 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 1,306 hours spilling →
River Irwell 139 1,306 down 9% 100%
Rowrah Pumping Station
Storm discharge at pumping station
Company site name
Rowrah PS
EA ID / permit
UUP01691 · EPRBP3420GJ
Outlet location
NY0611018780 (OS grid reference) · View on Apple Maps
WFD catchment
Marron (GB112075070540)
2024 spills / hours
28 / 236
Long-term average
37.3 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 1,274 hours spilling →
Colliergate Beck 73 1,274 up 161% 100%
Birkenhead WwTW Birke
Storm tank at sewage works
Sewage works
Birkenhead Birke
Company site name
BIRKENHEAD WwTW
EA ID / permit
UUP00243 · 016993399
Outlet location
SJ3292089490 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Moreton; Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
160 / 1,982
Long-term average
132.6 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 1,273 hours spilling →
Mersey Estuary 105 1,273 down 34% 100%
Soutergate WwTW Soute Soute
Inlet overflow at sewage works
Sewage works
Soutergate Soute Soute
Company site name
SOUTERGATE WwTW
EA ID / permit
UUP01780 · 017470020
Outlet location
SD2205081370 (OS grid reference) · View on Apple Maps
WFD catchment
DUDDON (GB531207411800)
Bathing water
Haverigg; Walney Biggar Bank; Walney West Shore; Walney Sandy Gap
2024 spills / hours
92 / 1,359
Long-term average
103.6 spills a year (monitored since 2017)
High-spill reason (company)
Data collection - Confirmed exceptional weather
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1,271 hours spilling →
Soutergate Beck 90 1,271 down 2% 99%
Kershopefoot Village STW
Inlet overflow at sewage works
Sewage works
Kershopefoot Village
Company site name
Kershopefoot WwTW
EA ID / permit
UUP02268 · Unpermitted
Outlet location
NY4850083500 (OS grid reference) · View on Apple Maps
WFD catchment
Esk (Eden and Esk) (GB102077074190)
2024 spills / hours
177 / 2,042
Long-term average
145.5 spills a year (monitored since 2024)
High-spill reason (company)
Data collection - EDM non-representative location
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 1,233 hours spilling →
Kershope Burn 114 1,233 down 36% 93%
Eaglesfield WwTW Eagle
Storm tank at sewage works
Sewage works
Eaglesfield Eagle
Company site name
EAGLESFIELD WwTW
EA ID / permit
UUP00672 · 017570037
Outlet location
NY0980428544 (OS grid reference) · View on Apple Maps
WFD catchment
Cocker - conf Whit Beck to conf Derwent (GB112075070400)
2024 spills / hours
139 / 1,571
Long-term average
199.6 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 1,214 hours spilling →
Dubbs Gutter 134 1,214 down 4% 97%
Rossendale WwTW
Storm tank at sewage works
Sewage works
Rossendale
Company site name
ROSSENDALE WwTW
EA ID / permit
UUP01689 · 016950042
Outlet location
SD7957020610 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Cowpe Bk to Rossendale STW) (GB112069064641)
2024 spills / hours
100 / 1,402
Long-term average
115.8 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 1,205 hours spilling →
River Irwell 84 1,205 down 16% 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.