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
Thornton Road Ellesmere Port CSO
Overflow on sewer network
Company site name
Little Stanney SO
EA ID / permit
UUP01936 · 016881595
Outlet location
SJ4155074980 (OS grid reference) · View on Apple Maps
WFD catchment
Stanney Mill Brook (GB112068060260)
2024 spills / hours
42 / 145
Long-term average
37.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
Stanney Brook 10 39 down 76% 100%
South of Peel Terrace CSO
Overflow on sewer network
Company site name
South of Peel Terrace CSO
EA ID / permit
UUP01787 · 01TRA0051
Outlet location
SJ7945093410 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
17 / 124
Long-term average
10.3 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
Riv. Mersey/Kickety Brook 10 39 down 41% 100%
Welwyn Drive CSO 37044
Overflow on sewer network
Company site name
Welwyn Drive CSO
EA ID / permit
UUP02073 · 016982967
Outlet location
SD7823000150 (OS grid reference) · View on Apple Maps
WFD catchment
Folly Brook and Salteye Brook (GB112069061430)
2024 spills / hours
82 / 34
Long-term average
61.5 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 39 hours spilling →
Folly Brook 77 39 down 6% 98%
Cow Hill Clarksons Fold CSO 33100
Overflow on sewer network
Company site name
Cow Hill Lane, Preston CSO (33100)
EA ID / permit
UUP00549 · 017190863
Outlet location
SD5705034030 (OS grid reference) · View on Apple Maps
WFD catchment
Savick Brook (GB112071065470)
Bathing water
St Annes
2024 spills / hours
8 / 59
Long-term average
7.1 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
Savick Brook, a tributary of River Ribble 4 39 down 50% 100%
Princess Rd (Peter St) CSO (50006)
Overflow on sewer network
Company site name
Princess Road (St.Peter) CSO
EA ID / permit
UUP01583 · 016983355
Outlet location
SJ5861098950 (OS grid reference) · View on Apple Maps
WFD catchment
Millingford (Newton) Brook (GB112069061220)
2024 spills / hours
35 / 65
Long-term average
32.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
Millingford Brook 18 39 down 49% 99%
Saughall Massie Rd/Devonshire Rdcso
Overflow on sewer network
Company site name
Saughall Massie Road / Devonshire Road CSO
EA ID / permit
UUP01720 · 01WIR0078
Outlet location
SJ2540088540 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
Bathing water
Moreton
2024 spills / hours
25 / 61
Long-term average
19.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
Arrowe Brook 12 39 down 52% 98%
Petteril Railway Bridge CSO
Overflow on sewer network
Company site name
D/S Petterill Railway Bridge
EA ID / permit
UUP01544 · 017670038
Outlet location
NY4138055060 (OS grid reference) · View on Apple Maps
WFD catchment
Petteril d/s Blackrack Beck (GB102076074030)
2024 spills / hours
9 / 23
Long-term average
7.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
River Petteril 10 39 up 11% 100%
Rear 237 Runcorn Road CSO (472PR)
Overflow on sewer network
Company site name
Rear 237 Runcorn Road CSO
EA ID / permit
UUP01619 · 01VRY0051
Outlet location
SJ6292075180 (OS grid reference) · View on Apple Maps
WFD catchment
Cogshall Brook (GB112068060510)
2024 spills / hours
39 / 62
Long-term average
44.2 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 38 hours spilling →
Trent and Mersey Canal 24 38 down 38% 100%
Moresby Parks Pumping Station
Storm discharge at pumping station
Company site name
Moresby Park PS
EA ID / permit
UUP01340 · 017470124
Outlet location
NY0031018540 (OS grid reference) · View on Apple Maps
WFD catchment
Keekle (upper) (GB112074070030)
2024 spills / hours
7 / 14
Long-term average
9.2 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 38 hours spilling →
Blackwood Beck 13 38 up 86% 100%
Edward Street CSO
Overflow on sewer network
Company site name
Edward Street (Dunkinfield) CSO
EA ID / permit
UUP00693 · 01TAM0074
Outlet location
SJ9355096350 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
17 / 23
Long-term average
30.2 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 38 hours spilling →
Trib of River Tame via SWS 27 38 up 59% 100%
Outside 81 Wodlane CSO 513OI
Overflow on sewer network
Company site name
Outside 81 Wood Lane CSO
EA ID / permit
UUP01489 · 01WIR0084
Outlet location
SJ2580088260 (OS grid reference) · View on Apple Maps
WFD catchment
The Birket including Arrowe Brook and Fender (GB112068060530)
2024 spills / hours
26 / 36
Long-term average
24.4 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 38 hours spilling →
Arrowe Brook 24 38 down 8% 100%
Wolseley Road CSO
Overflow on sewer network
Company site name
Wolseley Road CSO
EA ID / permit
UUP02158 · 017160324
Outlet location
SD5311028280 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE_Transitional (GB531207112400)
Bathing water
Southport; St Annes; St. Annes North; Blackpool South
Shellfish water
Ribble
2024 spills / hours
4 / 17
Long-term average
9.9 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 38 hours spilling →
River Ribble Estuarine Waters 3 38 down 25% 100%
Waterloo St Crescent Rd CSO
Overflow on sewer network
Company site name
Waterloo Street/Crescent Road CSO
EA ID / permit
UUP02047 · 01MAN0074
Outlet location
SD8537001580 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
62 / 85
Long-term average
38.9 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 38 hours spilling →
River Irk 18 38 down 71% 100%
Waterside CSO 052Z1
Overflow on sewer network
Company site name
Waterside CSO
EA ID / permit
UUP02051 · 017180721
Outlet location
SD7156023000 (OS grid reference) · View on Apple Maps
WFD catchment
Davyfield Brook (GB112071065260)
2024 spills / hours
13 / 60
Long-term average
7.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 37 hours spilling →
Waterside Brook 9 37 down 31% 100%
Victoria St/Acre St CSO (442WA)
Overflow on sewer network
Company site name
Victoria Street/Acre Street Storm Overflow
EA ID / permit
UUP02001 · 01TAM0062
Outlet location
SJ9169094650 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Swineshaw Brook to Mersey) (GB112069061112)
2024 spills / hours
29 / 38
Long-term average
36.0 spills a year (monitored since 2021)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 37 hours spilling →
Denton Brook via SWS 34 37 up 17% 97%
Highfield Road CSO
Overflow on sewer network
Company site name
Highfield Road CSO
EA ID / permit
UUP00167 · 016993911
Outlet location
SD8261022200 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Cowpe Bk to Rossendale STW) (GB112069064641)
2024 spills / hours
17 / 64
Long-term average
16.2 spills a year (monitored since 2020)
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 37 hours spilling →
River Irwell 13 37 down 24% 64%
Manor Avenue Carrington Lane CSO
Overflow on sewer network
Company site name
Manor Avenue/Carrington Lane CSO
EA ID / permit
UUP01244 · 016892366
Outlet location
SJ7645092840 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
25 / 29
Long-term average
31.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 37 hours spilling →
Stromford Brook 24 37 down 4% 100%
Melbourne Park CSO
Overflow on sewer network
EA ID / permit
UUP01276 · 017680278
Outlet location
NY4159055340 (OS grid reference) · View on Apple Maps
WFD catchment
Petteril d/s Blackrack Beck (GB102076074030)
Bathing water
Allonby
2024 spills / hours
10 / 23
Long-term average
15.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 37 hours spilling →
River Petterill 16 37 up 60% 97%
Turner Bridge CSO
Overflow on sewer network
Company site name
Turner Bridge CSO
EA ID / permit
UUP01970 · 016983218
Outlet location
SD7251009960 (OS grid reference) · View on Apple Maps
WFD catchment
Tonge (GB112069064530)
2024 spills / hours
47 / 39
Long-term average
67.3 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 37 hours spilling →
River Tonge 42 37 down 11% 100%
Penny Bridge CSO
Overflow on sewer network
Company site name
Penny Bridge CSO
EA ID / permit
UUP01532 · 017190752
Outlet location
SD8145063271 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble (Stainforth to Long Preston Beck) (GB112071065614)
2024 spills / hours
37 / 73
Long-term average
46.0 spills a year (monitored since 2020)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 37 hours spilling →
River Ribble 31 37 down 16% 100%
Schola Green Lane PS
Storm discharge at pumping station
Company site name
Schola Green Lane Pumping Station
EA ID / permit
UUP01725 · 017370197
Outlet location
SD4139064370 (OS grid reference) · View on Apple Maps
WFD catchment
Overton Dyke (GB112072065950)
Bathing water
Morecambe North; Morecambe South
Shellfish water
Morecambe Bay East
2024 spills / hours
8 / 20
Long-term average
15.4 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 36 hours spilling →
Morecambe Bay 14 36 up 75% 89%
Opp 255 Buxton Road
Overflow on sewer network
Company site name
Opposite 255 Buxton Road CSO
EA ID / permit
UUP01465 · 016982663
Outlet location
SJ9355085860 (OS grid reference) · View on Apple Maps
WFD catchment
Poise Brook (GB112069060950)
2024 spills / hours
28 / 32
Long-term average
18.5 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 36 hours spilling →
Hazel Grove Brook 9 36 down 68% 85%
Roaches Lock CSO
Overflow on sewer network
Company site name
Roaches Lock
EA ID / permit
UUP01666 · 016940369
Outlet location
SD9796003130 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
31 / 35
Long-term average
32.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 36 hours spilling →
River Tame 24 36 down 23% 100%
Water Street/Liverpool Road CSO
Overflow on sewer network
Company site name
Water Street/Liverpool Road CSO
EA ID / permit
UUP02041 · 016993597
Outlet location
SJ8282297894 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452)
2024 spills / hours
14 / 38
Long-term average
15.3 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 36 hours spilling →
River Irwell 11 36 down 21% 86%
Port Carlisle Pumping Station
Storm discharge at pumping station
Company site name
Port Carlisle Pumping Station (Site ID PRTCA) (ALL0135)
EA ID / permit
UUP01563 · 017680456
Outlet location
NY2412162461 (OS grid reference) · View on Apple Maps
WFD catchment
SOLWAY (GB530207614700)
2024 spills / hours
5 / 6.7
Long-term average
4.9 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 36 hours spilling →
The Solway Firth 6 36 up 20% 100%
White Hart Inn CSO
Overflow on sewer network
Company site name
White Hart Inn Combined Sewer Overflow
EA ID / permit
UUP02111 · 01PEA0067
Outlet location
SK0121081350 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Randall Carr Brook to Sett). (GB112069060880)
2024 spills / hours
10 / 98
Long-term average
17.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 36 hours spilling →
River Goyt 7 36 down 30% 99%
Armit Rd (Grasscroft) CSO PS
Overflow on sewer network
Company site name
Armit Road (Grasscroft) CSO
EA ID / permit
UUP00830 · 016950639
Outlet location
SD9802003930 (OS grid reference) · View on Apple Maps
WFD catchment
Tame (Chew Brook to Swineshaw Brook) (GB112069061111)
2024 spills / hours
17 / 105
Long-term average
15.2 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 36 hours spilling →
River Tame 9 36 down 47% 96%
St Marys Church (Chipping) CSO
Overflow on sewer network
Company site name
ST MARYS CHURCH CSO
EA ID / permit
UUP01823 · 01RIB0005
Outlet location
SD6236043300 (OS grid reference) · View on Apple Maps
WFD catchment
Chipping Brook (GB112071065330)
2024 spills / hours
13 / 3.3
Long-term average
18.5 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 36 hours spilling →
Chipping Brook 36 36 up 177% 99%
Colne Refuse Transfer Station
Overflow on sewer network
Company site name
Colne Refuse Transfer Station CSO (Site ID 322YC) (PEN0059)
EA ID / permit
UUP00522 · 01PEN0059
Outlet location
SD8749039380 (OS grid reference) · View on Apple Maps
WFD catchment
Colne Water - Trawden Bk to Wanless Water (GB112071065200)
2024 spills / hours
28 / 69
Long-term average
27.6 spills a year (monitored since 2018)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 35 hours spilling →
Colne Water 11 35 down 61% 100%
Egerton St Worsley St CSO
Overflow on sewer network
Company site name
Egerton Street / Worsley Street CSO
EA ID / permit
UUP00695 · 016983277
Outlet location
SJ8279197530 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Lumb Brook to Irwell) (GB112069061152)
2024 spills / hours
45 / 28
Long-term average
64.3 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 35 hours spilling →
The River Medlock 45 35 no change 99%
Preston Network Terminal Pumping St
Storm discharge at pumping station
Company site name
Preston Network Terminal Pumping Station (Site ID HOWCK) (PRE0125)
EA ID / permit
UUP01572 · EPRMB3990NU
Outlet location
SD5037729025 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE - transitional (GB531207112400)
Bathing water
St Annes
2024 spills / hours
19 / 73
Long-term average
15.3 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 35 hours spilling →
River Ribble (Tidal) 11 35 down 42% 100%
Moston Rd/ Chadderton Low Level PS
Storm discharge at pumping station
Company site name
Moston Road Combined Sewer Overflow/Chadderton Low Level Pumping Station (318N4) (OLD0157)
EA ID / permit
UUP01355 · 016983361
Outlet location
SD8869004570 (OS grid reference) · View on Apple Maps
WFD catchment
Wince Brook (GB112069061120)
2024 spills / hours
28 / 50
Long-term average
37.4 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 35 hours spilling →
Wince Brook 13 35 down 54% 97%
Aspin Lane CSO 281CJ
Overflow on sewer network
Company site name
ASPIN LANE CSO
EA ID / permit
UUP00152 · 01MAN0031
Outlet location
SJ8421099220 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
33 / 20
Long-term average
53.0 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 35 hours spilling →
River Irk 50 35 up 52% 100%
King George Prescot CSO
Overflow on sewer network
Company site name
King George V Memorial Playing Field
EA ID / permit
UUP01064 · 016930642
Outlet location
SJ4613092260 (OS grid reference) · View on Apple Maps
WFD catchment
Prescot Brook (Logwood Mill Brook) (GB112069060710)
2024 spills / hours
40 / 47
Long-term average
42.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 35 hours spilling →
Prescot Brook Trib Ditton Brk 30 35 down 25% 100%
Thompson Road CSO
Overflow on sewer network
Company site name
Thompson Road Combined Sewer Overflow (Site ID 07055) (BOL0053)
EA ID / permit
UUP01929 · 016950279
Outlet location
SD6993010450 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
18 / 51
Long-term average
45.7 spills a year (monitored since 2020)
Monitor below 90%
Sensor failure / issue · Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 35 hours spilling →
Captains Clough 8 35 down 56% 66%
Broadway CSO OLD0170
Overflow on sewer network
Company site name
Broadway CSO Opp Football Ground (319KO)
EA ID / permit
UUP02201 · EPRJB3892NM
Outlet location
SD9045105719 (OS grid reference) · View on Apple Maps
WFD catchment
Wince Brook (GB112069061120)
2024 spills / hours
141 / 1,888
Long-term average
85.5 spills a year (monitored since 2024)
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 35 hours spilling →
Tributary of Wince Brook 30 35 down 79% 49%
Vicarage Road
Overflow on sewer network
Company site name
Vicarage Road CSO
EA ID / permit
UUP01992 · 01STH0079
Outlet location
SJ5429097180 (OS grid reference) · View on Apple Maps
WFD catchment
Black Brook (Mersey Estuary) (GB112069061230)
2024 spills / hours
7 / 22
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 34 hours spilling →
Clipsley Brook 5 34 down 29% 95%
Warrington New Road (42060)
Overflow on sewer network
Company site name
Warrington New Road CSO
EA ID / permit
UUP02020 · 016993695
Outlet location
SJ5187095180 (OS grid reference) · View on Apple Maps
WFD catchment
Hardshaw (Windle) Brook (GB112069061210)
2024 spills / hours
20 / 35
Long-term average
22.2 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 34 hours spilling →
Hardshaw Brook 18 34 down 10% 100%
Langley Road CSO
Overflow on sewer network
Company site name
Langley Road CSO
EA ID / permit
UUP01108 · 016993610
Outlet location
SD8070001000 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Croal to Irk) (GB112069061451)
2024 spills / hours
43 / 52
Long-term average
50.8 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 34 hours spilling →
River Irwell 32 34 down 26% 100%
The Greenacres CSO
Overflow on sewer network
Company site name
The Greenacres CSO
EA ID / permit
UUP01922 · 017180545
Outlet location
SD4979027051 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE - transitional (GB531207112400)
Bathing water
St Annes
2024 spills / hours
23 / 57
Long-term average
16.1 spills a year (monitored since 2017)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 34 hours spilling →
Unnamed tributary of Mill Brook 13 34 down 43% 100%
Ainslie Street/Newport St CSO 041A7
Overflow on sewer network
Company site name
Ainslie Street/Newport Street CSO
EA ID / permit
UUP00091 · 01BRW0011
Outlet location
SD1966070552 (OS grid reference) · View on Apple Maps
WFD catchment
Furness Permo-Triassic sandstone aquifers (GB41201G101900)
Shellfish water
Walney
2024 spills / hours
0 / 0.0
Long-term average
4.9 spills a year (monitored since 2019)
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 34 hours spilling →
Ormsgill Reservoir 34 34 up from 0 100%
Stockport Rd Essex Ave CSO 432SK
Overflow on sewer network
Company site name
Stockport Road/Essex Avenue CSO
EA ID / permit
UUP01861 · 016982653
Outlet location
SJ8776089891 (OS grid reference) · View on Apple Maps
WFD catchment
Mersey (upstream of Manchester Ship Canal) (GB112069061030)
2024 spills / hours
17 / 24
Long-term average
36.3 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 34 hours spilling →
River Mersey Estuary via SWS 29 34 up 71% 99%
Chester Road (Middlewich) PS (13510)
Storm discharge at pumping station
Company site name
Chester Road (Middlewich) WwNPS
EA ID / permit
UUP01364 · EPRTB3193AZ
Outlet location
SJ6947066690 (OS grid reference) · View on Apple Maps
WFD catchment
Wheelock (Fowle Brook to Dane) (GB112068055380)
2024 spills / hours
44 / 73
Long-term average
45.4 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 34 hours spilling →
Wheelock (Fowle Brook to Dane) 35 34 down 20% 100%
Edge Lane/Wilbraham CSO
Overflow on sewer network
Company site name
Edge Lane/Wilbraham Road CSO
EA ID / permit
UUP00689 · 016993694
Outlet location
SJ8078093260 (OS grid reference) · View on Apple Maps
WFD catchment
Chorlton Brook (Princess Parkway to Mersey) (GB112069061040)
2024 spills / hours
22 / 35
Long-term average
39.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 33 hours spilling →
Chorlton Brook via SWS 25 33 up 14% 100%
Dow Bridge CSO 19080
Overflow on sewer network
Company site name
Dow Bridge CSO (19080)
EA ID / permit
UUP00652 · 017190860
Outlet location
SD4360031700 (OS grid reference) · View on Apple Maps
WFD catchment
Dow Brook (GB112071065670)
Bathing water
St Annes
2024 spills / hours
8 / 27
Long-term average
9.4 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 33 hours spilling →
Dow Brook 7 33 down 13% 100%
Waverley Rd CSO 352W4
Overflow on sewer network
Company site name
Waverley Road CSO
EA ID / permit
UUP02061 · 01ROC0014
Outlet location
SD8764007330 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Sourtce to Wince Brook) (GB112069061161)
2024 spills / hours
54 / 79
Long-term average
86.6 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 33 hours spilling →
Trub Brook River Irk 32 33 down 41% 100%
Laundry St/Duchy Rd CSO
Overflow on sewer network
Company site name
Laundry Street/Duchy Road Combined Sewer Overflow
EA ID / permit
UUP01119 · 016993761
Outlet location
SD8153000410 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Croal to Irk) (GB112069061451)
2024 spills / hours
26 / 40
Long-term average
38.4 spills a year (monitored since 2021)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 33 hours spilling →
River Irwell via SWS 27 33 up 4% 100%
Thornpark Pumping Station 33007
Overflow on sewer network
Company site name
THORNPARK PS
EA ID / permit
UUP01932 · 01PRE0082
Outlet location
SD4983029960 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE_Transitional (GB531207112400)
Bathing water
St Annes
Shellfish water
Ribble
2024 spills / hours
26 / 89
Long-term average
24.3 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 33 hours spilling →
Unnamed watercourse, tributary of River Ribble 10 33 down 62% 100%
Sandford Village WwTW
Inlet overflow at sewage works
Sewage works
Sandford Village
Company site name
SANDFORD VILLAGE WwTW
EA ID / permit
UUP01711 · 017680300
Outlet location
NY7306016077 (OS grid reference) · View on Apple Maps
WFD catchment
Eden - Scandal Beck to Lyvennet (GB102076070880)
2024 spills / hours
33 / 109
Long-term average
63.3 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 33 hours spilling →
River Eden 25 33 down 24% 100%
Buxton Rd Andrew Ln CSO 435GX
Overflow on sewer network
Company site name
Buxton Road/Andrew Lane CSO
EA ID / permit
UUP00386 · 01STK0093
Outlet location
SJ9556085430 (OS grid reference) · View on Apple Maps
WFD catchment
Poise Brook (GB112069060950)
2024 spills / hours
10 / 13
Long-term average
121.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 33 hours spilling →
Unnamed Brook 28 33 up 180% 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.