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
Haslam Park North & South CSO
Overflow on sewer network
Company site name
Haslam Park North and South Combined Sewer Overflow (Site ID 33026) (PRE0090)
EA ID / permit
UUP00910 · 017190870
Outlet location
SD5140531166 (OS grid reference) · View on Apple Maps
WFD catchment
Savick Brook (GB112071065470)
Bathing water
St Annes
2024 spills / hours
0 / 0.0
Long-term average
4.2 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Savick Brook 0 0.0 no change 100%
Glazebrook Lane CSO in Field
Overflow on sewer network
Company site name
Glazebrook Lane CSO
EA ID / permit
UUP00800 · 01WAR0040
Outlet location
SJ7019091940 (OS grid reference) · View on Apple Maps
WFD catchment
Glaze (GB112069061420)
2024 spills / hours
3 / 13
Long-term average
4.2 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Glaze Brook 0 0.0 down 100% 100%
Mallard Street/Charles Street CSO
Overflow on sewer network
Company site name
Mallard Street/Charles Street CSO
EA ID / permit
UUP01223 · 016982736
Outlet location
SJ8417197501 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Lumb Brook to Irwell) (GB112069061152)
2024 spills / hours
1 / 0.3
Long-term average
4.2 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medlock 0 0.0 down 100% 99%
Wallasey Coastal Drive 51052
Storm discharge at pumping station
Company site name
Wallasey Detention Tank
EA ID / permit
UUP02009 · 016983123
Outlet location
SJ2945094053 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY MOUTH - transitional (GB641211630001)
Bathing water
Meols; Moreton; Wallasey
Shellfish water
North Wirral (East); North Wirral (West)
2024 spills / hours
1 / 0.0
Long-term average
4.4 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Mersey Estuary 0 0.0 down 100% 100%
Manchester Road CSO
Overflow on sewer network
Company site name
Manchester Road CSO
EA ID / permit
UUP01236 · 016982936
Outlet location
SD8070007730 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Spodden to Irwell) (GB112069064600)
2024 spills / hours
3 / 0.8
Long-term average
4.6 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
The River Roch via a surface water sewer 0 0.0 down 100% 100%
807 Walmersley Road (Bury) CSO
Overflow on sewer network
Company site name
807 Walmersley Road (Bury) CSO
EA ID / permit
UUP00060 · 016982618
Outlet location
SD8047013840 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Rossendale STW to Roch) (GB112069064620)
2024 spills / hours
8 / 3.9
Long-term average
4.8 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Walmersely Brook 0 0.0 down 100% 96%
Haslam Park North & South CSO
Overflow on sewer network
Company site name
Haslam Park North and South Combined Sewer Overflow (Site ID 33026) (PRE0090)
EA ID / permit
UUP00909 · 017190870
Outlet location
SD5130431107 (OS grid reference) · View on Apple Maps
WFD catchment
Savick Brook (GB112071065470)
Bathing water
St Annes
2024 spills / hours
0 / 0.0
Long-term average
5.2 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Savick Brook 0 0.0 no change 100%
Woodvale Flats CSO
Overflow on sewer network
Company site name
Woodvale Flats combined sewer overflow (059AF) (BBN0151)
EA ID / permit
UUP02170 · 017180476
Outlet location
SD6888022570 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - headwaters to conf Davy Field Bk (GB112071065240)
2024 spills / hours
0 / 0.0
Long-term average
5.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Darwen 0 0.0 no change 100%
Downs Road Combined Sewer Overflow
Overflow on sewer network
Company site name
Downs Road CSO
EA ID / permit
UUP00653 · 016892108
Outlet location
SJ5163082730 (OS grid reference) · View on Apple Maps
WFD catchment
Bridgewater Canal (GB71210001)
2024 spills / hours
7 / 1.3
Long-term average
5.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Bridgewater Canal via SWS 0 0.0 down 100% 100%
Off Walmersley Road CSO 092JL
Overflow on sewer network
Company site name
Off Walmersley Road CSO
EA ID / permit
UUP01451 · 016993850
Outlet location
SD8062013230 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Rossendale STW to Roch) (GB112069064620)
2024 spills / hours
1 / 0.9
Long-term average
5.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Pigs Lea Brook Trib Rvr Irwell 0 0.0 down 100% 100%
Tintern Road (Off the Land) CSO
Overflow on sewer network
Company site name
Tintern Road (Off the Land) CSO
EA ID / permit
UUP01945 · EPRQB3594AD
Outlet location
SD8733007390 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Sourtce to Wince Brook) (GB112069061161)
2024 spills / hours
8 / 1.3
Long-term average
6.8 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Trib of Trub Brook via SWS 0 0.0 down 100% 100%
Church Bank Railway Viaduct CSO
Overflow on sewer network
Company site name
CHURCH BANK / RAILWAY VIADUCT CSO
EA ID / permit
UUP00479 · 01BOL0130
Outlet location
SD7214009280 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Brook (GB112069064540)
2024 spills / hours
2 / 0.2
Long-term average
7.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Croal Minor 0 0.0 down 100% 97%
Middleton Overton WwTW
Storm tank at sewage works
Sewage works
Middleton Overton
Company site name
MIDDLETON OVERTON WwTW
EA ID / permit
UUP01297 · 017270051
Outlet location
SD4304057960 (OS grid reference) · View on Apple Maps
WFD catchment
Overton Dyke (GB112072065950)
Bathing water
Morecambe South Morecambe North
Shellfish water
Lune (Broadfleet and Plover Scar)
2024 spills / hours
0 / 0.0
Long-term average
7.3 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Lades Pool 0 0.0 no change 100%
Burnley Road East/Townley Arms CSO
Overflow on sewer network
Company site name
Burnley Road East/Townley Arms CSO
EA ID / permit
UUP00371 · 016993545
Outlet location
SD8392025240 (OS grid reference) · View on Apple Maps
WFD catchment
Whitewell Brook (GB112069064670)
2024 spills / hours
2 / 2.6
Long-term average
7.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Whitewell Brook 0 0.0 down 100% 100%
Bridge End CSO 151F5
Overflow on sewer network
Company site name
Bridge End CSO
EA ID / permit
UUP00311 · 017190756
Outlet location
SD8167564085 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble (Stainforth to Long Preston Beck) (GB112071065614)
2024 spills / hours
3 / 5.8
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
R Ribble via A Surface W Sewer 0 0.0 down 100% 100%
Melbourne Street/Water Street CSO
Overflow on sewer network
Company site name
MELBOURNE STREET / WATER STREET CSO
EA ID / permit
UUP01278 · 01HYN0034
Outlet location
SD7621028760 (OS grid reference) · View on Apple Maps
WFD catchment
Hyndburn (GB112071065040)
2024 spills / hours
0 / 0.0
Long-term average
8.2 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Culverted Trib River Hyndburn 0 0.0 no change 98%
Kiln Brow Combined Sewer Overflow
Overflow on sewer network
Company site name
Kiln Brow CSO
EA ID / permit
UUP01062 · 017480401
Outlet location
NY0165013400 (OS grid reference) · View on Apple Maps
WFD catchment
Ehen (upper including Liza) (GB112074070010)
Bathing water
St Bees
2024 spills / hours
1 / 0.3
Long-term average
8.3 spills a year (monitored since 2024)
Monitor below 90%
Sensor failure / issue · Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Ehen 0 0.0 down 100% 78%
Infirmary Street CSO 05050
Overflow on sewer network
Company site name
Infirmary Street CSO
EA ID / permit
UUP01020 · 01BBN0027
Outlet location
SD6789026930 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - conf Davy Field Bk to conf Blakewater (GB112071065270)
2024 spills / hours
28 / 277
Long-term average
8.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Leeds/Liverpool Canal 0 0.0 down 100% 94%
Hawcoat Lane/Hartland Road CSO
Overflow on sewer network
Company site name
Hawcoat Lane/Hartland Road CSO
EA ID / permit
UUP00917 · 017480440
Outlet location
SD2194069336 (OS grid reference) · View on Apple Maps
WFD catchment
Mill Beck (Poaka Beck) (GB112074069790)
Bathing water
Walney Biggar Bank; Walney West Shore; Walney Sandy Gap
Shellfish water
Walney; Roosebeck
2024 spills / hours
– / –
Long-term average
8.8 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Mill Beck 0 0.0 96%
Old Road CSO
Overflow on sewer network
Company site name
Old Road CSO
EA ID / permit
UUP01456 · 016982635
Outlet location
SK0229097370 (OS grid reference) · View on Apple Maps
WFD catchment
Etherow (Woodhead Res. to Glossop Bk.) (GB112069060780)
2024 spills / hours
0 / 0.0
Long-term average
9.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Syke Culvert to River Etherow 0 0.0 no change 98%
Strines WwTW
Inlet overflow at sewage works
Sewage works
Strines
Company site name
STRINES WwTW
EA ID / permit
UUP01886 · 016940182
Outlet location
SJ9701187101 (OS grid reference) · View on Apple Maps
WFD catchment
Goyt (Sett to Etherow) (GB112069060960)
2024 spills / hours
0 / 0.0
Long-term average
9.2 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
River Goyt 0 0.0 no change 100%
West Strand CSO Chamber C10 PRE0071
Overflow on sewer network
Company site name
West Strand CSO
EA ID / permit
UUP02080 · 017190872
Outlet location
SD5259329501 (OS grid reference) · View on Apple Maps
WFD catchment
RIBBLE_Transitional (GB531207112400)
Bathing water
St Annes
2024 spills / hours
33 / 14
Long-term average
9.3 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Chain Caul Culvert 0 0.0 down 100% 100%
Briscoe Lane CSO
Overflow on sewer network
Company site name
Briscoe Lane CSO
EA ID / permit
UUP00330 · 016982735
Outlet location
SJ8747099340 (OS grid reference) · View on Apple Maps
WFD catchment
Medlock (Lumb Brook to Irwell) (GB112069061152)
2024 spills / hours
0 / 0.0
Long-term average
9.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medlock 0 0.0 no change 100%
Brentford Street CSO
Overflow on sewer network
EA ID / permit
UUP00308 · 01MAN0127
Outlet location
SD8610001200 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
0 / 0.0
Long-term average
10.2 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Unnamed Watercourse 0 0.0 no change 97%
Sandgate (Penrith) CSO (17552)
Overflow on sewer network
Company site name
Sandgate (Penrith) CSO
EA ID / permit
UUP01712 · 01EDE0033
Outlet location
NY5169030290 (OS grid reference) · View on Apple Maps
WFD catchment
Eamont (Upper) (GB102076071020)
2024 spills / hours
10 / 10
Long-term average
10.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Thacka Beck via SWS 0 0.0 down 100% 100%
Dantzic St Warford St CSO 288A7
Overflow on sewer network
Company site name
DANTZIC STREET / WARFORD STREET CSO
EA ID / permit
UUP00611 · 01MAN0039
Outlet location
SJ8460099540 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
1 / 0.5
Long-term average
11.5 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Irk 0 0.0 down 100% 100%
Huyton Farm Pumping Station
Storm discharge at pumping station
Company site name
Huyton Farm PS
EA ID / permit
UUP01006 · 016997049
Outlet location
SJ4234092560 (OS grid reference) · View on Apple Maps
WFD catchment
Alt (GB112069060580)
2024 spills / hours
23 / 13
Long-term average
11.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Un-Named Trib. of River Alt 0 0.0 down 100% 99%
Marton North WwTW
Inlet overflow at sewage works
Sewage works
Marton North
Company site name
MARTON NORTH (Cassia) WwTW
EA ID / permit
UUP01258 · 016810093
Outlet location
SJ6205067880 (OS grid reference) · View on Apple Maps
WFD catchment
Bogart Brook (GB112068060540)
2024 spills / hours
23 / 221
Long-term average
11.5 spills a year (monitored since 2024)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - May
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Bogart Brook 0 0.0 down 100% 86%
Hapsford Pumping Station
Storm discharge at pumping station
Company site name
Hapsford PS
EA ID / permit
UUP00898 · 016810286
Outlet location
SJ4708574494 (OS grid reference) · View on Apple Maps
WFD catchment
Peckmill Brook, Hoolpool Gutter at Ince Marshes. (GB112068060330)
2024 spills / hours
3 / 1.9
Long-term average
11.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Hornsmill Brook 0 0.0 down 100% 100%
Melmerby STW
Inlet overflow at sewage works
Sewage works
Melmerby
Company site name
MELMERBY WwTW
EA ID / permit
UUP01282 · 017670068
Outlet location
NY6010037660 (OS grid reference) · View on Apple Maps
WFD catchment
Robberby Water (GB102076073810)
2024 spills / hours
9 / 8.3
Long-term average
12.2 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Melmerby (Dale) Beck 0 0.0 down 100% 100%
Rear of Sunnyside Terrace CSO
Overflow on sewer network
Company site name
Rear of Sunnyside Terrace CSO
EA ID / permit
UUP01639 · 017280303
Outlet location
SD3717047380 (OS grid reference) · View on Apple Maps
WFD catchment
WYRE - transitional (GB531207212200)
Bathing water
Fleetwood
Shellfish water
Lune (Broadfleet and Plover Scar)
2024 spills / hours
0 / 0.0
Long-term average
13.7 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
trib of Cockers Dyke 0 0.0 no change 99%
Long Hey Road CSO
Overflow on sewer network
Company site name
Long Hey Road CSO
EA ID / permit
UUP01173 · CM0077001
Outlet location
SJ2302083940 (OS grid reference) · View on Apple Maps
WFD catchment
Dee (N. Wales) (GB531106708200)
Bathing water
West Kirby
Shellfish water
Dee (East)
2024 spills / hours
8 / 18
Long-term average
14.0 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
River Dee (North Wales) 0 0.0 down 100% 100%
Kingsbridge Road CSO (289BQ)
Overflow on sewer network
Company site name
Kingsbridge Road CSO
EA ID / permit
UUP01069 · 01MAN0071
Outlet location
SD8546001280 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
1 / 0.1
Long-term average
14.4 spills a year (monitored since 2021)
Monitor below 90%
Access - Unable to retrieve data from non-telemetry data logger · Resolved - May
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Irk 0 0.0 down 100% 65%
Primrose Hill CSO
Overflow on sewer network
Company site name
Primrose Hill CSO
EA ID / permit
UUP01579 · 01BRY0022
Outlet location
SD8151010320 (OS grid reference) · View on Apple Maps
WFD catchment
Roch (Spodden to Irwell) (GB112069064600)
2024 spills / hours
8 / 14
Long-term average
14.6 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Barn Brook 0 0.0 down 100% 78%
Sabden CSO (342P9)
Overflow on sewer network
Company site name
Sabden CSO
EA ID / permit
UUP01702 · 017180013
Outlet location
SD7691036740 (OS grid reference) · View on Apple Maps
WFD catchment
Sabden Brook (GB112071065140)
2024 spills / hours
4 / 4.8
Long-term average
15.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Sabden Brook 0 0.0 down 100% 99%
Casterton WwTW
Storm tank at sewage works
Sewage works
Casterton
Company site name
CASTERTON WwTW
EA ID / permit
UUP00418 · 017270014
Outlet location
SD6176079550 (OS grid reference) · View on Apple Maps
WFD catchment
Lune - conf Rawthey to conf Greta (GB112072071690)
2024 spills / hours
2 / 1.8
Long-term average
15.3 spills a year (monitored since 2017)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
River Lune 0 0.0 down 100% 68%
Arthur St/Meeting House Lane CSO
Overflow on sewer network
Company site name
Arthur Street/Meeting House Lane CSO
EA ID / permit
UUP00136 · 017680535
Outlet location
NY5151030290 (OS grid reference) · View on Apple Maps
WFD catchment
Eamont (Upper) (GB102076071020)
2024 spills / hours
1 / 0.1
Long-term average
15.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Thacka Beck Clvrt via A SWS 0 0.0 down 100% 93%
Sankey Bridges PS
Storm discharge at pumping station
Company site name
Sankey Bridge PS
EA ID / permit
UUP01718 · 01WAR0028
Outlet location
SJ5855087620 (OS grid reference) · View on Apple Maps
WFD catchment
MERSEY - Transitional (GB531206908100)
2024 spills / hours
31 / 84
Long-term average
15.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Sankey Brook 0 0.0 down 100% 100%
Bromley Street CSO 281MT
Overflow on sewer network
Company site name
Bromley Street Nr Railway Arch CSO
EA ID / permit
UUP00340 · 016982627
Outlet location
SJ8449099400 (OS grid reference) · View on Apple Maps
WFD catchment
Irk (Wince to Irwell) (GB112069061131)
2024 spills / hours
5 / 0.8
Long-term average
16.0 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Irk 0 0.0 down 100% 93%
Merchants Landing Culvert St CSO
Overflow on sewer network
Company site name
Merchants Landing (Culvert Street) CSO
EA ID / permit
UUP01283 · NPSWQD010689
Outlet location
SD6877027450 (OS grid reference) · View on Apple Maps
WFD catchment
Blakewater (GB112071065310)
2024 spills / hours
0 / 0.0
Long-term average
18.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Culvert Culvert St 0 0.0 no change 99%
Oldham WwTW
Storm tank at sewage works
Sewage works
Oldham
Company site name
OLDHAM WwTW
EA ID / permit
UUP01458 · 016950038
Outlet location
SD8937004430 (OS grid reference) · View on Apple Maps
WFD catchment
Wince Brook (GB112069061120)
2024 spills / hours
0 / 0.0
Long-term average
18.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Wince Brook 0 0.0 no change 100%
Kay Street CSO
Overflow on sewer network
Company site name
Kay Street
EA ID / permit
UUP01048 · 017180465
Outlet location
SD6957022310 (OS grid reference) · View on Apple Maps
WFD catchment
Darwen - headwaters to conf Davy Field Bk (GB112071065240)
2024 spills / hours
7 / 1.6
Long-term average
18.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Trib River Darwen 0 0.0 down 100% 100%
Ainsdale Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Ainsdale
Company site name
Ainsdale WwTW
EA ID / permit
UUP02259 · Unpermitted
Outlet location
SD3203011100 (OS grid reference) · View on Apple Maps
WFD catchment
Chisnall Brook (GB112069064510)
Bathing water
Southport
Shellfish water
Ribble
2024 spills / hours
37 / 264
Long-term average
18.5 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Fine Janes Brook 0 0.0 down 100% 100%
Croft Drv Shore Rd CSO Caldy 512RB
Overflow on sewer network
Company site name
Croft Drive/Shore Road CSO
EA ID / permit
UUP00566 · CG037860101
Outlet location
SJ2223084820 (OS grid reference) · View on Apple Maps
WFD catchment
Dee (N. Wales) (GB531106708200)
Bathing water
West Kirby
2024 spills / hours
0 / 0.0
Long-term average
19.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Dee Estuary 0 0.0 no change 100%
Hest Bank Pumping Station
Storm discharge at pumping station
Company site name
Hest Bank PS
EA ID / permit
UUP00945 · 017290499
Outlet location
SD4684066860 (OS grid reference) · View on Apple Maps
WFD catchment
KENT - transitional (GB531207312000)
Bathing water
Morecambe North
2024 spills / hours
25 / 202
Long-term average
19.3 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing
Hatlex Beck 0 0.0 down 100% 83%
Grimsargh CSO 333LG
Overflow on sewer network
Company site name
Grimsargh CSO
EA ID / permit
UUP00864 · 01PRE0061
Outlet location
SD5896034240 (OS grid reference) · View on Apple Maps
WFD catchment
Ribble - conf Calder to tidal (GB112071065500)
2024 spills / hours
2 / 0.1
Long-term average
20.4 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Trib Tun Brook 0 0.0 down 100% 96%
Bury New Road/Waterloo Road CSO
Overflow on sewer network
Company site name
Bury New Road/Waterloo Road CSO
EA ID / permit
UUP00382 · 016982984
Outlet location
SJ8349099550 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Croal to Irk) (GB112069061451)
2024 spills / hours
1 / 0.2
Long-term average
22.2 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Irwell 0 0.0 down 100% 100%
New Hall Hey Bridge CSO
Overflow on sewer network
Company site name
New Hall Hey Bridge CSO
EA ID / permit
UUP01377 · 016982933
Outlet location
SD8095022410 (OS grid reference) · View on Apple Maps
WFD catchment
Irwell (Cowpe Bk to Rossendale STW) (GB112069064641)
2024 spills / hours
1 / 0.2
Long-term average
22.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Irwell 0 0.0 down 100% 100%
560 Manchester Road CSO
Overflow on sewer network
Company site name
580 Manchester Road CSO
EA ID / permit
UUP00050 · 01HYN0038
Outlet location
SD7755026110 (OS grid reference) · View on Apple Maps
WFD catchment
Hyndburn (GB112071065040)
2024 spills / hours
0 / 0.0
Long-term average
23.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Via Culvert to Woodnook Water 0 0.0 no change 99%
Marple Road CSO (432EV) (STK0096)
Overflow on sewer network
Company site name
Marple Road CSO
EA ID / permit
UUP01256 · 016982662
Outlet location
SJ9266088870 (OS grid reference) · View on Apple Maps
WFD catchment
Poise Brook (GB112069060950)
2024 spills / hours
14 / 9.0
Long-term average
24.3 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Poise Brook 0 0.0 down 100% 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.