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
Mill Brow/Blackley New Road CSO
Overflow on sewer network
Company site name
Mill Brow/Blackley New Road CSO
EA ID / permit
UUP01303 · 016982717
Outlet location
SD8520502856 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
13 / 9.5
Long-term average
15.7 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.3 hours spilling →
Culverted Trib of River Irk 10 8.3 down 23% 93%
11 North Park Avenue CSO
Overflow on sewer network
EA ID / permit
UUP00005 · 01PEN0027
Outlet location
SD8537038380 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
3 / 5.5
Long-term average
74.2 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 8.3 hours spilling →
Pendle Water 7 8.3 up 133% 100%
North Road Combined Sewer Overflow
Overflow on sewer network
Company site name
NORTH ROAD CSO
EA ID / permit
UUP01406 · 01ALL0011
Outlet location
NY1504042270 (OS grid reference) · View on Apple Maps
WFD catchment
Crookhurst Beck (GB112075073660)
2024 spills / hours
7 / 5.4
Long-term average
16.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.3 hours spilling →
Unnamed Trib of Sandwith Beck 17 8.3 up 143% 99%
Nr Footbridge Over Brk
Overflow on sewer network
Company site name
Monmouth Crescent
EA ID / permit
UUP01416 · 01WIG0119
Outlet location
SJ5862698924 (OS grid reference) · View on Apple Maps
WFD catchment
Millingford (Newton) Brook (GB112069061220)
2024 spills / hours
– / –
Long-term average
1.0 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.2 hours spilling →
Millingford (Newton) Brook 1 8.2 88%
Penrith SPS
Storm discharge at pumping station
Company site name
Gillwilly PS
EA ID / permit
UUP01537 · 017670039
Outlet location
NY5082030500 (OS grid reference) · View on Apple Maps
WFD catchment
Eamont (Upper) (GB102076071020)
2024 spills / hours
1 / 0.1
Long-term average
2.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.2 hours spilling →
Thacka Beck 3 8.2 up 200% 100%
Darcy Lever Old Hall CSO
Overflow on sewer network
Company site name
Darcy Lever Old Hall CSO
EA ID / permit
UUP00614 · 01BOL0165
Outlet location
SD7458007770 (OS grid reference) · View on Apple Maps
WFD catchment
Croal (including Blackshaw Brook) (GB112069064550)
2024 spills / hours
12 / 14
Long-term average
18.9 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.2 hours spilling →
Blackshaw Brook 10 8.2 down 17% 96%
Tbc
Overflow on sewer network
Company site name
Eagle Brow CSO (489KT)
EA ID / permit
UUP02209 · Permit applied for
Outlet location
SJ6824987202 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
0 / 0.0
Long-term average
5.5 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 8.1 hours spilling →
Slitten Brook 11 8.1 up from 0 88%
Common Bank Lane CSO Chorl
Overflow on sewer network
Company site name
Common Bank Lane CSO
EA ID / permit
UUP00527 · 017081355
Outlet location
SD5678017740 (OS grid reference) · View on Apple Maps
WFD catchment
Yarrow DS Big Lodge Water (GB112070064952)
2024 spills / hours
3 / 3.4
Long-term average
1.8 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.1 hours spilling →
River Chor Diversion Channel 1 8.1 down 67% 99%
Clover Road Pumping Station
Storm discharge at pumping station
Company site name
Clover Road PS
EA ID / permit
UUP00515 · 017081574
Outlet location
SD5685015890 (OS grid reference) · View on Apple Maps
WFD catchment
Yarrow DS Big Lodge Water (GB112070064952)
2024 spills / hours
7 / 7.8
Long-term average
30.6 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.1 hours spilling →
River Yarrow 4 8.1 down 43% 100%
Tbc
Overflow on sewer network
Company site name
Delph New Road CSO (319LB)
EA ID / permit
UUP02206 · Permit applied for
Outlet location
SD9872307476 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Source to Chew Brook) (GB112069064741)
2024 spills / hours
1 / 0.1
Long-term average
1.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.0 hours spilling →
River Tame 2 8.0 up 100% 98%
Lumb Lane CSO (432D0)
Overflow on sewer network
Company site name
Lumb Lane CSO
EA ID / permit
UUP01210 · 01STK0016
Outlet location
SJ8921084610 (OS grid reference) · View on Apple Maps
WFD catchment
Micker Brook (GB112069060940)
2024 spills / hours
4 / 5.7
Long-term average
10.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 8.0 hours spilling →
Carr Brook via SWS 6 8.0 up 50% 99%
Leadale Road CSO 402CQ
Overflow on sewer network
Company site name
Leadale Road CSO
EA ID / permit
UUP01126 · 01SRI0018
Outlet location
SD5285022270 (OS grid reference) · View on Apple Maps
WFD catchment
Lostock DS Farington Weir (GB112070064912)
Bathing water
St Annes
Shellfish water
Ribble
2024 spills / hours
10 / 9.8
Long-term average
11.6 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.9 hours spilling →
A culverted section Bannister Brook, tributary of the River Lostock 7 7.9 down 30% 95%
Woodhill Road CSO 092JP
Overflow on sewer network
Company site name
Woodhill Road CSO
EA ID / permit
UUP02165 · 01BRY0012
Outlet location
SD7971011340 (OS grid reference) · View on Apple Maps
WFD catchment
Kirklees Brook (GB112069064610)
2024 spills / hours
5 / 8.3
Long-term average
4.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.8 hours spilling →
Woodhill Brook 5 7.8 no change 100%
Green Lane Lyndhurst Ave CSO
Overflow on sewer network
Company site name
Green Lane/Lyndhurst Avenue CSO
EA ID / permit
UUP00847 · 016993675
Outlet location
SD9376000210 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Source to Lumb Brook) (GB112069061151)
2024 spills / hours
8 / 7.9
Long-term average
8.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.8 hours spilling →
Smallshaw Brook 5 7.8 down 38% 100%
Alsager Rd CSO
Overflow on sewer network
Company site name
Alsager Road Combined Sewer Overflow (Site ID 291BO) (NEW0039)
EA ID / permit
UUP00105 · 016882294
Outlet location
SJ7960051530 (OS grid reference) · View on Apple Maps
WFD catchment
Valley Brook (Source to Englesea Brook) (GB112068074630)
2024 spills / hours
14 / 34
Long-term average
11.0 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 7.7 hours spilling →
Audley Brook 5 7.7 down 64% 100%
Overton Garden Terrace PS
Storm discharge at pumping station
Company site name
Garden Terrace Pumping Station (Site ID GARDE) (LAN0098)
EA ID / permit
UUP01492 · 017280288
Outlet location
SD4234058510 (OS grid reference) · View on Apple Maps
WFD catchment
Morecambe Bay - transitional (GB641211171000)
Bathing water
Morecambe South
2024 spills / hours
0 / 0.0
Long-term average
1.4 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.7 hours spilling →
An unnamed field drain, into a tributary of the River Lune 1 7.7 up from 0 100%
Murton Bridge House Pumping Station
Storm discharge at pumping station
Company site name
Murton (Bridge House) PS
EA ID / permit
UUP01362 · 017680533
Outlet location
NY7275121661 (OS grid reference) · View on Apple Maps
WFD catchment
Trout Beck (Murton) (GB102076070850)
2024 spills / hours
6 / 8.2
Long-term average
4.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.7 hours spilling →
Murton Beck 6 7.7 no change 99%
Ashemores Lane Lawton Rd CSO 131CE
Overflow on sewer network
Company site name
Ashmores Lane/Lawton Road CSO
EA ID / permit
UUP00142 · 016892428
Outlet location
SJ7989056281 (OS grid reference) · View on Apple Maps
WFD catchment
Kidsgrove Stream (including Day Green Stream) (GB112068055390)
2024 spills / hours
32 / 24
Long-term average
26.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.6 hours spilling →
Cresswellshawe Brook via SWS 17 7.6 down 47% 95%
Tbc
Overflow on sewer network
Company site name
Sankey Ind Est CSO (428NI)
EA ID / permit
UUP02238 · Permit applied for
Outlet location
SJ5720594497 (OS grid reference) · View on Apple Maps
WFD catchment
Sankey Brook (Rainford Brook to Mersey) (GB112069061200)
2024 spills / hours
24 / 53
Long-term average
14.0 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 7.6 hours spilling →
Sankey Brook 4 7.6 down 83% 60%
Kendall Road Blackley CSO
Overflow on sewer network
Company site name
Kendall Road (Blackley) Combined Sewer Overflow
EA ID / permit
UUP01054 · 016982987
Outlet location
SD8383003360 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
21 / 11
Long-term average
7.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.5 hours spilling →
River Irk via Birch Brook Clvr 5 7.5 down 76% 100%
Heysham Village Pumping Station
Storm discharge at pumping station
Company site name
Heysham Village PS
EA ID / permit
UUP00950 · 017370153
Outlet location
SD4100061990 (OS grid reference) · View on Apple Maps
WFD catchment
Morecambe Bay (GB641211171000)
2024 spills / hours
0 / 0.0
Long-term average
2.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.5 hours spilling →
Morecambe Bay 9 7.5 up from 0 100%
Hoo Green STW
Inlet overflow at sewage works
Sewage works
Hoo Green
Company site name
Hoo Green WwTW
EA ID / permit
UUP02266 · Unpermitted
Outlet location
SJ7188082520 (OS grid reference) · View on Apple Maps
WFD catchment
Smoker Brook (Gale Brook to Wincham Brook) (GB112068060410)
2024 spills / hours
2 / 3.4
Long-term average
4.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.4 hours spilling →
Tabley Brook 6 7.4 up 200% 98%
Riverside Road Pumping Station
Storm discharge at pumping station
Company site name
Riverside Road pumping station (Site ID 38026) (SEF0083)
EA ID / permit
UUP01664 · 01SEF0083
Outlet location
SD2960003650 (OS grid reference) · View on Apple Maps
WFD catchment
ALT (GB531206908300)
Bathing water
Formby
Shellfish water
Ribble
2024 spills / hours
46 / 8.8
Long-term average
46.3 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 7.4 hours spilling →
River Alt 38 7.4 down 17% 100%
Southwaite WwTW
Inlet overflow at sewage works (with treatment)
Sewage works
Southwaite
Company site name
SOUTHWAITE WwTW
EA ID / permit
UUP01795 · 017670112
Outlet location
NY4495046350 (OS grid reference) · View on Apple Maps
WFD catchment
Petteril d/s Blackrack Beck (GB102076074030)
Treatment
Reed bed
2024 spills / hours
15 / 51
Long-term average
6.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.4 hours spilling →
River Petteril 7 7.4 down 53% 100%
Chuddleigh Road CSO
Overflow on sewer network
Company site name
Chudleigh Road CSO
EA ID / permit
UUP00477 · 016993672
Outlet location
SD8455002830 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
19 / 13
Long-term average
41.8 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 7.3 hours spilling →
The River Irk via SWS 13 7.3 down 32% 100%
Causeway PS (480006)
Storm discharge at pumping station
Company site name
Causeway Pumping Station
EA ID / permit
UUP00430 · EPRTB3193DV
Outlet location
SJ6068087600 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
2024 spills / hours
11 / 4.2
Long-term average
8.3 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.3 hours spilling →
River Mersey 5 7.3 down 55% 100%
Mill Lane Combined Sewer Overflow
Overflow on sewer network
Company site name
Mill Lane CSO
EA ID / permit
UUP01310 · 016982772
Outlet location
SJ9406094780 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
12 / 10
Long-term average
9.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 7.3 hours spilling →
River Tame 1 7.3 down 92% 100%
Jct of Manchester Rd/Station Rd CSO
Overflow on sewer network
Company site name
Junction of Manchester/Station Road CSO
EA ID / permit
UUP01032 · 01BOL0142
Outlet location
SD6240009950 (OS grid reference) · View on Apple Maps
WFD catchment
Croal Minor (GB112069064540)
2024 spills / hours
19 / 9.9
Long-term average
26.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.3 hours spilling →
Unnamed Trib of Middle Brook 11 7.3 down 42% 100%
Newchurch Road Bacup CSO
Overflow on sewer network
Company site name
NEWCHURCH ROAD (Bacup) CSO
EA ID / permit
UUP01389 · 01ROS0033
Outlet location
SD8625021820 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Source to Whitewell Brook) (GB112069064660)
2024 spills / hours
9 / 13
Long-term average
11.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.3 hours spilling →
River Irwell 4 7.3 down 56% 96%
Station Road (Whitworth) CSO
Overflow on sewer network
Company site name
Station Road (Whitworth) CSO
EA ID / permit
UUP01851 · 01ROS0044
Outlet location
SD8804016380 (OS grid reference) · View on Apple Maps
WFD catchment
Spodden (GB112069064730)
2024 spills / hours
4 / 1.1
Long-term average
4.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.2 hours spilling →
River Spodden 2 7.2 down 50% 100%
Opp River St CSO (273BY)
Overflow on sewer network
Company site name
Opp River Street CSO
EA ID / permit
UUP01467 · 01MAC0045
Outlet location
SJ8476081560 (OS grid reference) · View on Apple Maps
WFD catchment
Bollin (Source to Dean) (GB112069061320)
2024 spills / hours
3 / 3.5
Long-term average
3.0 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.2 hours spilling →
River Bollin 3 7.2 no change 99%
Ferneyfield Road CSO OLD0104
Overflow on sewer network
Company site name
Ferneyfield Road Sewer
EA ID / permit
UUP00727 · 016950498
Outlet location
SD8976505556 (OS grid reference) · View on Apple Maps
WFD catchment
Wince Brook (GB112069061120)
2024 spills / hours
6 / 6.6
Long-term average
5.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.2 hours spilling →
Spring Brook via SWS 4 7.2 down 33% 100%
Oakhurst Avenue CSO
Overflow on sewer network
EA ID / permit
UUP01433 · 01HYN0040
Outlet location
SD7716030060 (OS grid reference) · View on Apple Maps
WFD catchment
Calder - Pendle Water to conf Ribble (GB112071065490)
2024 spills / hours
6 / 9.0
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 7.0 hours spilling →
Culvertedtrib. of Clough Brook 2 7.0 down 67% 99%
Northumberland Rd/Stretford Rd CSO
Overflow on sewer network
Company site name
Northumberland Street/Stretford Road CSO
EA ID / permit
UUP01411 · 016982992
Outlet location
SJ8170096650 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
7 / 4.8
Long-term average
76.0 spills a year (monitored since 2021)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.0 hours spilling →
Manchester Ship Canal 4 7.0 down 43% 84%
Off Manor Road CSO 442JF
Overflow on sewer network
Company site name
Off Manor Road CSO
EA ID / permit
UUP01445 · 016982693
Outlet location
SJ9415094150 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
10 / 6.4
Long-term average
25.4 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.0 hours spilling →
River Tame 6 7.0 down 40% 100%
Kirkbride WwTW
Storm tank at sewage works
Sewage works
Kirkbride
Company site name
Kirkbride Wastewater Treatment Works (Site ID KRKBR) (017570195)
EA ID / permit
UUP01076 · 017580195
Outlet location
NY2365056890 (OS grid reference) · View on Apple Maps
WFD catchment
SOLWAY (GB530207614700)
2024 spills / hours
62 / 947
Long-term average
55.3 spills a year (monitored since 2017)
Investigation
Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 6.9 hours spilling →
River Wampool 14 6.9 down 77% 100%
Spike Island Access Rd CSO (202RW)
Overflow on sewer network
Company site name
SPIKE ISLAND ACCESS ROAD CSO
EA ID / permit
UUP01801 · 01HAL0053
Outlet location
SJ5165084740 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
2024 spills / hours
29 / 12
Long-term average
16.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.9 hours spilling →
Bowers Brook 6 6.9 down 79% 99%
Greenwood Ave Platt Ave CSO 441XE
Overflow on sewer network
Company site name
Greenwood Avenue/Platt Avenue CSO
EA ID / permit
UUP00856 · 01TAM0051
Outlet location
SD9423000520 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Source to Lumb Brook) (GB112069061151)
2024 spills / hours
4 / 4.9
Long-term average
1.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.9 hours spilling →
Smallshaw Brook via SWS 2 6.9 down 50% 100%
Bridge Street CSO
Overflow on sewer network
Company site name
Bridge Street CSO
EA ID / permit
UUP00318 · 016982898
Outlet location
SJ8333098360 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
4 / 4.5
Long-term average
8.0 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.9 hours spilling →
River Irwell 10 6.9 up 150% 100%
Darby Lane CSO
Overflow on sewer network
Company site name
Darby Lane CSO
EA ID / permit
UUP00613 · 016982776
Outlet location
SD6146004480 (OS grid reference) · View on Apple Maps
WFD catchment
Hey/Borsdane Brook (GB112069064520)
2024 spills / hours
6 / 3.3
Long-term average
7.4 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.9 hours spilling →
Hockery Brook 2 6.9 down 67% 98%
95/97 Craig Road Heaton Mersey CSO
Overflow on sewer network
Company site name
95/97 Craig Road CSO
EA ID / permit
UUP00064 · 016982667
Outlet location
SJ8726089930 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
8 / 4.6
Long-term average
16.0 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.9 hours spilling →
River Mersey 5 6.9 down 38% 100%
Hesketh Lane CSO
Overflow on sewer network
EA ID / permit
UUP00944 · 01WLN0019
Outlet location
SD4569021050 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE - transitional (GB531207112400)
Bathing water
St Annes
Shellfish water
Ribble
2024 spills / hours
18 / 9.0
Long-term average
16.5 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 6.8 hours spilling →
River Douglas 12 6.8 down 33% 99%
Tbc
Inlet overflow at sewage works
Sewage works
Tbc
Company site name
Faugh WwTW
EA ID / permit
UUP02276 · Unpermitted
Outlet location
NY5077055350 (OS grid reference) · View on Apple Maps
WFD catchment
Trout Beck (Cairn Beck) (GB102076073900)
2024 spills / hours
19 / 11
Long-term average
16.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.8 hours spilling →
Trib Trout Beck 14 6.8 down 26% 98%
Kiribati Way CSO
Overflow on sewer network
Company site name
Kiribati Way CSO
EA ID / permit
UUP01072 · 016983320
Outlet location
SD6503000870 (OS grid reference) · View on Apple Maps
WFD catchment
Westleigh Brook (GB112069060820)
2024 spills / hours
1 / 4.1
Long-term average
1.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.8 hours spilling →
Westleigh Brook 3 6.8 up 200% 100%
Waterside Mill CSO
Overflow on sewer network
Company site name
Waterside Mill Combined Sewer Overflow
EA ID / permit
UUP02053 · 016950084
Outlet location
SD7941009510 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Rossendale STW to Roch) (GB112069064620)
2024 spills / hours
3 / 7.1
Long-term average
4.3 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Resolved - May
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.8 hours spilling →
River Irwell 3 6.8 no change 62%
Cowde Rd Br.
Overflow on sewer network
Company site name
Cowpe Road SSO
EA ID / permit
UUP00550 · 01ROS0042
Outlet location
SD8344021730 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Source to Whitewell Brook) (GB112069064660)
2024 spills / hours
8 / 12
Long-term average
4.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.8 hours spilling →
River Irwell 4 6.8 down 50% 100%
Nr Fire Stn Ormskirk Rd
Overflow on sewer network
Company site name
Ormskirk Road , Skelmersdale
EA ID / permit
UUP01415 · 017081270
Outlet location
SD4875005890 (OS grid reference) · View on Apple Maps
WFD catchment
Tawd (GB112070064790)
2024 spills / hours
11 / 8.6
Long-term average
10.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.7 hours spilling →
River Tawd 10 6.7 down 9% 100%
Tarporley WwTW
Inlet overflow at sewage works
Sewage works
Tarporley
Company site name
TARPORLEY WwTW
EA ID / permit
UUP01902 · 016810110
Outlet location
SJ5633061240 (OS grid reference) · View on Apple Maps
WFD catchment
Wettenhall Brook (GB112068055440)
2024 spills / hours
11 / 19
Long-term average
28.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.7 hours spilling →
Wettenhall Brook 9 6.7 down 18% 100%
Brownedge Lane CSO 401GR
Overflow on sewer network
Company site name
Brownedge Lane CSO
EA ID / permit
UUP00354 · 017180538
Outlet location
SD5633026290 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - conf Roddlesworth to tidal (GB112071065300)
2024 spills / hours
3 / 3.0
Long-term average
3.9 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 6.7 hours spilling →
Cockshott Bk Trb R Darwen 2 6.7 down 33% 100%
Green Row Silloth
Storm discharge at pumping station
Company site name
Greenrow Silloth PS
EA ID / permit
UUP00848 · 017580260
Outlet location
NY1124052680 (OS grid reference) · View on Apple Maps
WFD catchment
SOLWAY (GB530207614700)
Bathing water
Silloth
2024 spills / hours
7 / 6.7
Long-term average
4.6 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.6 hours spilling →
Unnamed tributary of the Great Gutter 7 6.6 no change 100%

Sewage treatment works

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

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