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
Walverden Park CSO
Overflow on sewer network
Company site name
Walverden Park CSO
EA ID / permit
UUP02015 · 017180618
Outlet location
SD8648037530 (OS grid reference) · View on Apple Maps
WFD catchment
Walverden Water (GB112071065130)
2024 spills / hours
10 / 11
Long-term average
16.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.9 hours spilling →
Walverden Water 4 4.9 down 60% 100%
CSO South of Ashawe Grove
Overflow on sewer network
Company site name
South of Ashawe Grove CSO
EA ID / permit
UUP00585 · 016982742
Outlet location
SD7156003030 (OS grid reference) · View on Apple Maps
WFD catchment
Astley Brook (Mersey) (GB112069061100)
2024 spills / hours
5 / 6.4
Long-term average
2.4 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.8 hours spilling →
Tributary of Honksford Brook 2 4.8 down 60% 100%
Crankwood Road Pumping Station
Storm discharge at pumping station
Company site name
Crankwood Road PS
EA ID / permit
UUP00560 · 016993851
Outlet location
SD6175000190 (OS grid reference) · View on Apple Maps
WFD catchment
Hey/Borsdane Brook (GB112069064520)
2024 spills / hours
3 / 5.9
Long-term average
4.6 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 4.8 hours spilling →
Tributary of Hey Brook 2 4.8 down 33% 100%
Woodlands Grove CSO
Overflow on sewer network
Company site name
Woodlands Grove CSO
EA ID / permit
UUP02168 · 01VRY0052
Outlet location
SJ6282075520 (OS grid reference) · View on Apple Maps
WFD catchment
Cogshall Brook (GB112068060510)
2024 spills / hours
21 / 9.3
Long-term average
30.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.7 hours spilling →
Trib of Trent & Mersey Canal 6 4.7 down 71% 100%
Carrington Rd/Offerton St
Overflow on sewer network
Company site name
Carrington Road/Offerton Street CSO
EA ID / permit
UUP00414 · 016982686
Outlet location
SJ9067090960 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Etherow to Mersey) (GB112069061000)
2024 spills / hours
10 / 4.7
Long-term average
9.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.7 hours spilling →
River Goyt 9 4.7 down 10% 99%
Fir Lane Combined Sewer Overflow
Overflow on sewer network
Company site name
FIR LANE CSO
EA ID / permit
UUP00735 · 01OLD0019
Outlet location
SD9197009000 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Sourtce to Wince Brook) (GB112069061161)
2024 spills / hours
35 / 18
Long-term average
53.5 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.7 hours spilling →
Unnamed Tributary of River Irk 4 4.7 down 89% 100%
The Bypass/Lpool Rd Junct CSO 382UR
Overflow on sewer network
Company site name
The Bypass / Liverpool Road Junction CSO
EA ID / permit
UUP01912 · 016982752
Outlet location
SJ3050098906 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY MOUTH - transitional (GB641211630001)
Bathing water
Wallasey
2024 spills / hours
5 / 2.9
Long-term average
28.6 spills a year (monitored since 2021)
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 4.6 hours spilling →
Mersey Estuary 9 4.6 up 80% 76%
Stamford St CSO (442SC)
Overflow on sewer network
Company site name
Stamford Street CSO
EA ID / permit
UUP01838 · 016993724
Outlet location
SJ9789099680 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
5 / 3.4
Long-term average
2.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 4.5 hours spilling →
Swineshaw Brook via SWS 2 4.5 down 60% 95%
Banksfield Avenue CSO 33027
Overflow on sewer network
Company site name
Banksfield Avenue CSO
EA ID / permit
UUP00185 · 017180625
Outlet location
SD5203031250 (OS grid reference) · View on Apple Maps
WFD catchment
Savick Brook (GB112071065470)
2024 spills / hours
9 / 36
Long-term average
9.9 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.5 hours spilling →
Savick Brk Trib of Ribble Est 6 4.5 down 33% 100%
Lovers Lane/Leigh Road CSO (50080)
Overflow on sewer network
Company site name
Lovers Lane/Leigh Road CSO
EA ID / permit
UUP01193 · 016993101
Outlet location
SD6629002300 (OS grid reference) · View on Apple Maps
WFD catchment
Bedford Brook (GB112069060810)
2024 spills / hours
24 / 66
Long-term average
32.8 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.5 hours spilling →
Collier Brook 5 4.5 down 79% 100%
Fulwood CSO
Overflow on sewer network
Company site name
Fulwood CSO
EA ID / permit
UUP00768 · 016930980
Outlet location
SJ3720086000 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
8 / 10
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 4.5 hours spilling →
River Mersey Estuary 7 4.5 down 13% 100%
Opposite No. 320 Liverpool Road CSO
Overflow on sewer network
Company site name
Opposite No.320 Liverpool Road CSO
EA ID / permit
UUP01472 · 01SEF0053
Outlet location
SD3319013610 (OS grid reference) · View on Apple Maps
WFD catchment
Three Pool's Waterway (GB112070064830)
Bathing water
St Annes; St Annes North; Blackpool South; Blackpool Central; Blackpool North; Southport; Ainsdale
Shellfish water
Ribble
2024 spills / hours
4 / 4.8
Long-term average
6.4 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.5 hours spilling →
Sandy Brook (a tributary of the River Alt) 6 4.5 up 50% 100%
Central Pumping Station
Storm discharge at pumping station
Company site name
Central Pumping Station
EA ID / permit
UUP00436 · 01WIG0100
Outlet location
SD6689000000 (OS grid reference) · View on Apple Maps
WFD catchment
Bedford Brook (GB112069060810)
2024 spills / hours
16 / 10
Long-term average
22.9 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 4.4 hours spilling →
Bedford Brook 12 4.4 down 25% 100%
Queens Rd/Hardham Vale CSO
Overflow on sewer network
Company site name
Queens Road/Hendham Vale CSO
EA ID / permit
UUP01597 · 016993692
Outlet location
SD8528000660 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
2 / 0.2
Long-term average
8.7 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.4 hours spilling →
The River Irk 3 4.4 up 50% 99%
Ramparts CSO 25075
Overflow on sewer network
Company site name
Ramparts CSO
EA ID / permit
UUP01608 · 017280425
Outlet location
SD4792062410 (OS grid reference) · View on Apple Maps
WFD catchment
LUNE (GB531207212100)
Bathing water
Morecambe South
Shellfish water
Morecambe Bay East; Lune (Broadfleet and Plover Scar)
2024 spills / hours
7 / 1.9
Long-term average
5.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.4 hours spilling →
The River Lune Estuary 5 4.4 down 29% 100%
Platt Lane Combined Sewer Overflow
Overflow on sewer network
Company site name
Platt Lane CSO
EA ID / permit
UUP01553 · 016941067
Outlet location
SJ8490094400 (OS grid reference) · View on Apple Maps
WFD catchment
Platt Brook (Source to Fallowfield Bk) (GB112069061060)
2024 spills / hours
1 / 1.5
Long-term average
0.8 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Resolved - Aug
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.4 hours spilling →
Platt Brook via SWS 1 4.4 no change 61%
Valley Drive CSO
Overflow on sewer network
Company site name
Rear of Valley Drive CSO
EA ID / permit
UUP01986 · 01ELL0008
Outlet location
SJ3795076560 (OS grid reference) · View on Apple Maps
WFD catchment
Rivacre Brook (GB112068060350)
2024 spills / hours
10 / 14
Long-term average
9.5 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 4.4 hours spilling →
Rivacre Brook 6 4.4 down 40% 100%
Beacons Gutter SSO
Overflow on sewer network
Company site name
Beacons Gutter CSO
EA ID / permit
UUP00206 · 016930971
Outlet location
SJ3320092700 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
14 / 4.1
Long-term average
10.7 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
Mersey Estuary 10 4.3 down 29% 100%
Lever Street No 5 CSO 078CD
Overflow on sewer network
Company site name
Lever Street Number 5 CSO
EA ID / permit
UUP01135 · 016983265
Outlet location
SD7196007833 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
0 / 0.0
Long-term average
3.1 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
Jenny Beck A Trib of Rvr Croal 4 4.3 up from 0 100%
Dam Head Bridge /Gisburn Road CSO
Overflow on sewer network
Company site name
Dam Head Bridge CSO
EA ID / permit
UUP00602 · 01PEN0026
Outlet location
SD8763047040 (OS grid reference) · View on Apple Maps
WFD catchment
Stock Beck (GB112071065540)
2024 spills / hours
8 / 3.9
Long-term average
11.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
Butts Beck 10 4.3 up 25% 100%
Vaughan Street CSO
Overflow on sewer network
Company site name
Bennett Street CSO
EA ID / permit
UUP01988 · 016982957
Outlet location
SJ8688097060 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
8 / 8.0
Long-term average
10.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
Clvrt Section of Corn Brook 1 4.3 down 88% 94%
Derby Street CSO (49200)
Overflow on sewer network
Company site name
Derby Street CSO
EA ID / permit
UUP00635 · 01WLN0029
Outlet location
SD4195008880 (OS grid reference) · View on Apple Maps
WFD catchment
Eller Brook (GB112070064810)
2024 spills / hours
10 / 7.1
Long-term average
14.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
Trib of Eller Brook via SWS 4 4.3 down 60% 93%
Briscoe Drive CSO 511G9
Overflow on sewer network
Company site name
Briscoe Drive CSO
EA ID / permit
UUP00329 · 016881734
Outlet location
SJ2762089732 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
2024 spills / hours
3 / 0.8
Long-term average
3.4 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
River Fender 7 4.3 up 133% 100%
Bradwell Avenue CSO
Overflow on sewer network
Company site name
Bradwell Avenue CSO (451HA) (TRA0068)
EA ID / permit
UUP00300 · 016940228
Outlet location
SJ7854095610 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
4 / 2.7
Long-term average
11.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
Longford Brook Trib Ship Canal 4 4.3 no change 97%
South Strand CSO (WYR0085)
Overflow on sewer network
Company site name
South Strand CSO (52514)
EA ID / permit
UUP02239 · EPRJB3791WT
Outlet location
SD3190245466 (OS grid reference) · View on Apple Maps
WFD catchment
Wyre - conf R Brock to tidal (GB112072066250)
Shellfish water
Lune (Wyre Estuary); Lune (Broadfleet and Plover Scar)
2024 spills / hours
1 / 1.0
Long-term average
4.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.2 hours spilling →
Culverted section of Copse Brook via a surface water sewer 8 4.2 up 700% 95%
396 Atherton Road CSO
Overflow on sewer network
Company site name
396 Atherton Road CSO
EA ID / permit
UUP00044 · 016983329
Outlet location
SD6266003630 (OS grid reference) · View on Apple Maps
WFD catchment
Hey/Borsdane Brook (GB112069064520)
2024 spills / hours
3 / 2.3
Long-term average
4.8 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.2 hours spilling →
Dog Pool Brook via SWS 2 4.2 down 33% 100%
Trentham P.S
Storm discharge at pumping station
Company site name
Trentham Street PS
EA ID / permit
UUP01966 · 016820392
Outlet location
SJ5070083441 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
2024 spills / hours
46 / 5.2
Long-term average
32.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.2 hours spilling →
River Mersey 18 4.2 down 61% 100%
Off St Lawrences Road CSO
Overflow on sewer network
Company site name
Off St Lawrence Road CSO
EA ID / permit
UUP01450 · 016982771
Outlet location
SJ9335095090 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
6 / 4.3
Long-term average
2.8 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.1 hours spilling →
Trib of River Tame via SWS 2 4.1 down 67% 100%
Warrington Rd/Withington
Overflow on sewer network
Company site name
Warrington Road/Withington Avenue
EA ID / permit
UUP02024 · 01WAR0109
Outlet location
SJ6608095240 (OS grid reference) · View on Apple Maps
WFD catchment
Glaze (GB112069061420)
2024 spills / hours
0 / 0.0
Long-term average
0.5 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.0 hours spilling →
Glaze 1 4.0 up from 0 99%
SSO Adj Cross Keys Inn
Overflow on sewer network
Company site name
Adjacent Cross Keys Inn
EA ID / permit
UUP01809 · 017280324
Outlet location
NY6164004390 (OS grid reference) · View on Apple Maps
WFD catchment
Lune - conf Birk Beck to conf Rawthey (GB112072071720)
2024 spills / hours
1 / 0.6
Long-term average
2.5 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.0 hours spilling →
Trib River Lune 4 4.0 up 300% 72%
In Fields Rear of 36 East Drive CSO
Overflow on sewer network
Company site name
In fields at rear of 36 East Drive CSO
EA ID / permit
UUP01016 · 016982743
Outlet location
SD7886001310 (OS grid reference) · View on Apple Maps
WFD catchment
Folly Brook and Salteye Brook (GB112069061430)
2024 spills / hours
12 / 24
Long-term average
11.0 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.0 hours spilling →
Folly Brook via A SWS 5 4.0 down 58% 100%
Parklands CSO 123JR CHR0015
Overflow on sewer network
Company site name
Parklands CSO
EA ID / permit
UUP01518 · 017081354
Outlet location
SD5694017740 (OS grid reference) · View on Apple Maps
WFD catchment
Yarrow DS Big Lodge Water (GB112070064952)
2024 spills / hours
48 / 25
Long-term average
1.6 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.9 hours spilling →
River Chor Trib River Yarrow 2 3.9 down 96% 97%
197 Middlewich Rd CSO 472E3 VRY0092
Overflow on sewer network
Company site name
197 Middlewich Road CSO
EA ID / permit
UUP01421 · 01VRY0092
Outlet location
SJ6753073601 (OS grid reference) · View on Apple Maps
WFD catchment
Wade Brook (GB112068060370)
2024 spills / hours
3 / 1.1
Long-term average
3.2 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.9 hours spilling →
Wade Brook 5 3.9 up 67% 100%
Station Rd Combined Sewer Overflow
Overflow on sewer network
Company site name
Station Road CSO
EA ID / permit
UUP01849 · 016881580
Outlet location
SJ2915091650 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
8 / 5.8
Long-term average
12.0 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.9 hours spilling →
Bidston Stream 6 3.9 down 25% 99%
Twist Lane/Westleigh Bridge CSO
Overflow on sewer network
Company site name
Twist Lane/Westleigh Bridge CSO
EA ID / permit
UUP01973 · 01WIG0065
Outlet location
SD6482000241 (OS grid reference) · View on Apple Maps
WFD catchment
Westleigh Brook (GB112069060820)
2024 spills / hours
11 / 8.1
Long-term average
15.2 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.8 hours spilling →
Westleigh Brook 3 3.8 down 73% 87%
Shaw Road CSO
Overflow on sewer network
Company site name
Shaw Road CSO
EA ID / permit
UUP01749 · 016982938
Outlet location
SD9326011200 (OS grid reference) · View on Apple Maps
WFD catchment
Beal (GB112069064690)
2024 spills / hours
2 / 0.4
Long-term average
1.4 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.8 hours spilling →
River Beal 2 3.8 no change 89%
Mowbreck Ww Ntwk PS
Storm discharge at pumping station
Company site name
Mowbreck Ww Ntwk PS
EA ID / permit
UUP01361 · 01FYL0036
Outlet location
SD4270033200 (OS grid reference) · View on Apple Maps
WFD catchment
Dow Brook (GB112071065670)
2024 spills / hours
0 / 0.0
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 3.8 hours spilling →
Unnamed Trib of Carr Brook 3 3.8 up from 0 100%
Limeside Rd/Church CSO
Overflow on sewer network
Company site name
Limeside Road CSO
EA ID / permit
UUP01144 · 016982632
Outlet location
SD9116001880 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Lumb Brook to Irwell) (GB112069061152)
2024 spills / hours
4 / 2.4
Long-term average
3.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.8 hours spilling →
Lords Brook 3 3.8 down 25% 100%
2 Mill Lane Combined Sewer Overflow
Overflow on sewer network
Company site name
2 Mill Lane CSO
EA ID / permit
UUP00016 · 01PRE0031
Outlet location
SD5250031380 (OS grid reference) · View on Apple Maps
WFD catchment
Savick Brook (GB112071065470)
2024 spills / hours
7 / 18
Long-term average
10.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.8 hours spilling →
Savick Brook via SWS 5 3.8 down 29% 96%
Manchester Road Sewer
Overflow on sewer network
Company site name
Manchester Road Sewer
EA ID / permit
UUP01237 · 01ROS0058
Outlet location
SD7808023252 (OS grid reference) · View on Apple Maps
WFD catchment
Ogden (GB112069064650)
2024 spills / hours
20 / 13
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 3.8 hours spilling →
Swinnel Brook 13 3.8 down 35% 97%
Edenfield Road CSO
Overflow on sewer network
Company site name
Edenfield Road CSO
EA ID / permit
UUP00686 · EPRQB3593DY
Outlet location
SD8579014610 (OS grid reference) · View on Apple Maps
WFD catchment
Naden Brook (GB112069064710)
2024 spills / hours
6 / 4.3
Long-term average
5.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.7 hours spilling →
Naden Brook 1 3.7 down 83% 100%
Rolleston Avenue/Butler Street CSO
Overflow on sewer network
Company site name
ROLLESTON AVENUE / BUTLER STREET CSO
EA ID / permit
UUP01681 · 01MAN0032
Outlet location
SJ8558098902 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Lumb Brook to Irwell) (GB112069061152)
2024 spills / hours
5 / 1.6
Long-term average
7.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.7 hours spilling →
River Medlock 5 3.7 no change 100%
Old Lancaster Lane CSO (PRE0126)
Overflow on sewer network
Company site name
Old Lancaster Lane CSO
EA ID / permit
UUP02232 · EPRJB3896AQ
Outlet location
SD5274930242 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE_Transitional (GB531207112400)
2024 spills / hours
10 / 3.4
Long-term average
12.0 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 3.7 hours spilling →
River Ribble via a surface water sewer 14 3.7 up 40% 85%
Burnley Road East/Shawclough CSO
Overflow on sewer network
Company site name
Burnley Road East/Shawclough Road CSO
EA ID / permit
UUP00370 · 01ROS0027
Outlet location
SD8362023210 (OS grid reference) · View on Apple Maps
WFD catchment
Whitewell Brook (GB112069064670)
2024 spills / hours
2 / 7.8
Long-term average
1.7 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.7 hours spilling →
Whitewll Brook 2 3.7 no change 100%
Rimrose Brook CSO
Overflow on sewer network
Company site name
Rimrose Brook CSO
EA ID / permit
UUP01657 · 016931012
Outlet location
SJ3180095800 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
Bathing water
Wallasey
Shellfish water
North Wirral (East)
2024 spills / hours
24 / 11
Long-term average
18.6 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.7 hours spilling →
Mersey Estuary 10 3.7 down 58% 100%
Off Foxholes Road CSO
Overflow on sewer network
Company site name
Off Foxholes Road CSO
EA ID / permit
UUP01439 · 016993392
Outlet location
SJ9434094000 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
15 / 7.6
Long-term average
11.8 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.7 hours spilling →
Trib of River Tame 10 3.7 down 33% 100%
Park St/Swinton Hall Road CSO
Overflow on sewer network
Company site name
Park Street/Swinton Hall Road
EA ID / permit
UUP01515 · EPRTB3192VK
Outlet location
SD7804001100 (OS grid reference) · View on Apple Maps
WFD catchment
Folly Brook and Salteye Brook (GB112069061430)
2024 spills / hours
8 / 4.9
Long-term average
12.0 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.6 hours spilling →
Trib Folly Brook via SWS 8 3.6 no change 100%
709 Bacup Road CSO
Overflow on sewer network
Company site name
OPPOSITE 709 BACUP ROAD CSO
EA ID / permit
UUP00056 · 01ROS0007
Outlet location
SD8335021830 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Source to Whitewell Brook) (GB112069064660)
2024 spills / hours
3 / 4.4
Long-term average
4.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.5 hours spilling →
River Irwell 2 3.5 down 33% 100%
Woolton STW
Inlet overflow at sewage works
Sewage works
Woolton
Company site name
Woolton WwTW
EA ID / permit
UUP02173 · 016930122
Outlet location
SJ4495087460 (OS grid reference) · View on Apple Maps
WFD catchment
Ditton Brook (Halewood to Mersey Estuary) (GB112069061390)
2024 spills / hours
20 / 29
Long-term average
20.0 spills a year (monitored since 2021)
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 3.5 hours spilling →
Halewood Brook 5 3.5 down 75% 74%
Opp 182 Rochdale Road CSO (BRY0141)
Overflow on sewer network
Company site name
Opposite 182 Rochdale Road CSO
EA ID / permit
UUP01464 · EPRJB3894EQ
Outlet location
SD8188310641 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Spodden to Irwell) (GB112069064600)
2024 spills / hours
3 / 0.4
Long-term average
3.5 spills a year (monitored since 2024)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.5 hours spilling →
Clv Trib of River Roch 4 3.5 up 33% 97%

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.