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

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.

Overflow	Discharges to	Spills 2025	Hours 2025	Spills vs 2024	Monitor uptime
Norbeck Park A CSO (Site 023A9) Overflow on sewer network Company site name Norbeck Park A CSO EA ID / permit UUP01403 · 017480286 Outlet location NY0114015370 (OS grid reference) · View on Apple Maps WFD catchment Keekle (lower) (GB112074070000) 2024 spills / hours 56 / 46 Long-term average 60.3 spills a year (monitored since 2018) Monitor below 90% Sensor failure / issue · Resolved - Dec Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 15 hours spilling →	Norbeck	29	15	down 48%	87%
Watery Lane Douglas St CSO PRE0110 Overflow on sewer network Company site name Watery Lane/Douglas Street CSO EA ID / permit UUP02058 · 017180544 Outlet location SD5014029280 (OS grid reference) · View on Apple Maps WFD catchment RIBBLE_Transitional (GB531207112400) 2024 spills / hours 3 / 2.4 Long-term average 2.5 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	Chain Caul Culvert Into Ribble	2	14	down 33%	100%
Chadderton High Level PS Storm discharge at pumping station Company site name The Causeway (Chadderton) Wastewater Network Pumping Station EA ID / permit UUP01914 · 016983315 Outlet location SD8910004470 (OS grid reference) · View on Apple Maps WFD catchment Wince Brook (GB112069061120) 2024 spills / hours 17 / 55 Long-term average 43.4 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	Wince Brook	11	14	down 35%	98%
Hall Moss Lane PS Storm discharge at pumping station Company site name Hall Moss Lane PS EA ID / permit UUP00883 · 016992842 Outlet location SJ8801083850 (OS grid reference) · View on Apple Maps WFD catchment Dean (Bollington to Bollin) (GB112069061360) 2024 spills / hours 0 / 0.0 Long-term average 1.0 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	Spath Brook	2	14	up from 0	100%
Winsford Wastewater Treatment Works Inlet overflow at sewage works Sewage works Winsford Company site name WINSFORD WwTW EA ID / permit UUP02147 · 016810116 Outlet location SJ6542967426 (OS grid reference) · View on Apple Maps WFD catchment Weaver (Winsford Flashes to Dane) (GB112068060463) 2024 spills / hours 33 / 74 Long-term average 37.4 spills a year (monitored since 2017) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	River Weaver	12	14	down 64%	100%
Waterfold Lane CSO Overflow on sewer network Company site name Waterfold Lane CSO EA ID / permit UUP02044 · 01ROC0032 Outlet location SD8170010050 (OS grid reference) · View on Apple Maps WFD catchment Roch (Spodden to Irwell) (GB112069064600) 2024 spills / hours 32 / 17 Long-term average 92.7 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 14 hours spilling →	River Roch	30	14	down 6%	96%
Hindle Street CSO Overflow on sewer network Company site name Hindle Street CSO EA ID / permit UUP00971 · 017190774 Outlet location SD6901022680 (OS grid reference) · View on Apple Maps WFD catchment Darwen - headwaters to conf Davy Field Bk (GB112071065240) 2024 spills / hours 18 / 10 Long-term average 23.0 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	River Darwen via SWS	14	14	down 22%	100%
Parr Bridge/Mosley Common Rd CSO Overflow on sewer network Company site name Parr Bridge/Mosley Common Road CSO EA ID / permit UUP01519 · 016982787 Outlet location SD7137001500 (OS grid reference) · View on Apple Maps WFD catchment Astley Brook (Mersey) (GB112069061100) 2024 spills / hours 13 / 16 Long-term average 20.0 spills a year (monitored since 2020) Monitor below 90% Sensor failure / issue · Resolved - Jul Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	Honksford Brook	8	14	down 38%	90%
Adlington Road CSO (271A4) Overflow on sewer network Company site name Adlington Road (Bollington Park) CSO EA ID / permit UUP00084 · 01MAC0120 Outlet location SJ9310078010 (OS grid reference) · View on Apple Maps WFD catchment Dean (Bollington to Bollin) (GB112069061360) 2024 spills / hours 36 / 44 Long-term average 31.8 spills a year (monitored since 2020) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 14 hours spilling →	River Dean	7	14	down 81%	96%
Watery Lane Former PS CSO 339DQ Overflow on sewer network Company site name Watery Lane PS CSO EA ID / permit UUP01350 · 017180543 Outlet location SD5013629292 (OS grid reference) · View on Apple Maps WFD catchment RIBBLE_Transitional (GB531207112400) Bathing water St Annes 2024 spills / hours 3 / 2.2 Long-term average 2.4 spills a year (monitored since 2018) Monitor below 90% Installation set-up/design issue · Resolved - Sep Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	River Ribble	2	14	down 33%	70%
Skirwith PS (Was WwTW) Storm discharge at pumping station Company site name Skirwith PS EA ID / permit UUP01767 · EPRFP3523KN Outlet location NY6062032750 (OS grid reference) · View on Apple Maps WFD catchment Briggle Beck (GB102076073800) 2024 spills / hours 4 / 9.8 Long-term average 10.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 14 hours spilling →	Briggle Beck	7	14	up 75%	100%
O/S 1 Teversham CSO Overflow on sewer network Company site name Outside 1 Teversham EA ID / permit UUP01486 · 017081271 Outlet location SD4785006970 (OS grid reference) · View on Apple Maps WFD catchment Tawd (GB112070064790) 2024 spills / hours 20 / 22 Long-term average 28.0 spills a year (monitored since 2018) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 14 hours spilling →	Pond tributary of River Tawd via surface water sewer	11	14	down 45%	97%
Meadowfield Gosforth CSO Overflow on sewer network Company site name Meadowfield Gosforth Combined Sewer Overflow (Site ID 02631) (COP0030) EA ID / permit UUP01271 · 017480395 Outlet location NY0685003370 (OS grid reference) · View on Apple Maps WFD catchment Bleng (GB112074070090) Bathing water Seascale 2024 spills / hours 14 / 6.6 Long-term average 15.6 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	Esk (W)	28	14	up 100%	100%
Albert Royds Street CSO Overflow on sewer network Company site name Albert Royds Street CSO EA ID / permit UUP00095 · EPRQB3591WC Outlet location SD9100014400 (OS grid reference) · View on Apple Maps WFD catchment Roch (Source to Spodden) (GB112069064720) 2024 spills / hours 1 / 8.8 Long-term average 11.7 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 14 hours spilling →	River Roch	2	14	up 100%	91%
Higher Folds (Queensway) PS (50029) Storm discharge at pumping station Company site name Higher Folds (Queensway) PS EA ID / permit UUP01600 · 01WIG0101 Outlet location SD6746000370 (OS grid reference) · View on Apple Maps WFD catchment Bedford Brook (GB112069060810) 2024 spills / hours 9 / 14 Long-term average 11.0 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	Pen Leach Brook	12	14	up 33%	100%
Windmill Lane CSO 44012 Overflow on sewer network Company site name Windmill Lane CSO EA ID / permit UUP02141 · 016983013 Outlet location SJ9115094820 (OS grid reference) · View on Apple Maps WFD catchment Tame (Swineshaw Brook to Mersey) (GB112069061112) 2024 spills / hours 16 / 35 Long-term average 18.4 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 14 hours spilling →	Denton Brook via Clvr Wcourse	9	14	down 44%	98%
Chestnut Road CSO Overflow on sewer network Company site name Chestnut Road CSO EA ID / permit UUP00465 · 01WIG0013 Outlet location SD5877006571 (OS grid reference) · View on Apple Maps WFD catchment Douglas - Mid (GB112070064780) 2024 spills / hours 11 / 8.9 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 14 hours spilling →	River Douglas via SWS	14	14	up 27%	96%
Princess St/Whitworth St CSO 282MN Overflow on sewer network Company site name Princess Street/Whitworth Street CSO EA ID / permit UUP01584 · 016982950 Outlet location SJ8433097521 (OS grid reference) · View on Apple Maps WFD catchment Medlock (Lumb Brook to Irwell) (GB112069061152) 2024 spills / hours 12 / 15 Long-term average 12.8 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 14 hours spilling →	River Medlock via SWS	12	14	no change	100%
Dobcross New Road CSO Overflow on sewer network Company site name Dobcross New Road CSO EA ID / permit UUP00643 · 016982509 Outlet location SD9904006320 (OS grid reference) · View on Apple Maps WFD catchment Tame (Source to Chew Brook) (GB112069064741) 2024 spills / hours 9 / 5.3 Long-term average 13.5 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	River Tame	4	13	down 56%	100%
Fishergate Hill CSO Chamber C8 Overflow on sewer network Company site name Fishergate Hill CSO EA ID / permit UUP00740 · 017190876 Outlet location SD5283728977 (OS grid reference) · View on Apple Maps WFD catchment RIBBLE_Transitional (GB531207112400) Bathing water St Annes 2024 spills / hours 0 / 0.0 Long-term average 10.0 spills a year (monitored since 2017) Monitor below 90% Installation set-up/design issue · Resolved - Oct Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	River Ribble via Chain Caul culvert	3	13	up from 0	61%
Stonehill Trading Estate CSO Overflow on sewer network Company site name Stonehill Trading Estate CSO EA ID / permit UUP01873 · 016993835 Outlet location SD7401104787 (OS grid reference) · View on Apple Maps WFD catchment Irwell (Croal to Irk) (GB112069061451) 2024 spills / hours 1 / 0.2 Long-term average 4.5 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	Singing Clough Brook	5	13	up 400%	99%
Glen House CSO Overflow on sewer network EA ID / permit UUP00805 · 01ALL0016 Outlet location NY0561028770 (OS grid reference) · View on Apple Maps WFD catchment Marron (GB112075070540) 2024 spills / hours 47 / 76 Long-term average 38.5 spills a year (monitored since 2019) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 13 hours spilling →	Unnamed Trib of River Marron	20	13	down 57%	98%
Middleton Road/Victoria Avenue CSO Overflow on sewer network Company site name MIDDLETON ROAD / VICTORIA AVENUE CSO EA ID / permit UUP01300 · 01MAN0096 Outlet location SD8386004060 (OS grid reference) · View on Apple Maps WFD catchment Irk (Wince to Irwell) (GB112069061131) 2024 spills / hours 5 / 5.0 Long-term average 49.8 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	Tributary of River Irk	4	13	down 20%	100%
230 London Road CSO Overflow on sewer network Company site name 230 London Road CSO EA ID / permit UUP00021 · 01VRY0074 Outlet location SJ6598073260 (OS grid reference) · View on Apple Maps WFD catchment Dane (Wheelock to Weaver) (GB112068060470) 2024 spills / hours 23 / 12 Long-term average 26.0 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 13 hours spilling →	River Dane via SWS	21	13	down 9%	100%
White Horse Yard CSO 022X9 Overflow on sewer network Company site name White Horse Yard CSO EA ID / permit UUP02112 · 01ALL0028 Outlet location NY1503041820 (OS grid reference) · View on Apple Maps WFD catchment Ellen (lower) (GB112075073640) 2024 spills / hours 32 / 15 Long-term average 33.0 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 13 hours spilling →	To Railway Track Drain	33	13	up 3%	96%
Spring Vale Combined Sewer Overflow Overflow on sewer network Company site name Spring Vale CSO EA ID / permit UUP01805 · 016982642 Outlet location SD8753006030 (OS grid reference) · View on Apple Maps WFD catchment Irk (Sourtce to Wince Brook) (GB112069061161) 2024 spills / hours 7 / 10 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 13 hours spilling →	River Irk	9	13	up 29%	97%
Mill Lane (Golborne) CSO Overflow on sewer network Company site name Mill Lane (Golborne) CSO EA ID / permit UUP01308 · 016983354 Outlet location SJ6060097290 (OS grid reference) · View on Apple Maps WFD catchment Millingford (Newton) Brook (GB112068055360) 2024 spills / hours 12 / 67 Long-term average 13.0 spills a year (monitored since 2021) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 13 hours spilling →	Newton Brook	2	13	down 83%	97%
Brinksway Bridge/Gville Street CSO Overflow on sewer network Company site name Brinksway Bridge/Grenville Street CSO EA ID / permit UUP00327 · 016982764 Outlet location SJ8850090020 (OS grid reference) · View on Apple Maps WFD catchment Mersey (upstream of Manchester Ship Canal) (GB112069061030) 2024 spills / hours 1 / 0.8 Long-term average 4.8 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	River Mersey	2	13	up 100%	99%
Dent Road Comibined Sewer Overflow Overflow on sewer network Company site name Dent Road CSO EA ID / permit UUP00629 · 01COP0037 Outlet location NY0075008870 (OS grid reference) · View on Apple Maps WFD catchment Ehen (lower) (GB112074069980) Bathing water St Bees 2024 spills / hours 24 / 7.5 Long-term average 26.3 spills a year (monitored since 2017) High-spill reason (company) Data collection - Confirmed exceptional weather Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	River Ehen	34	13	up 42%	99%
Queens Road Combined Sewer Overflow Overflow on sewer network Company site name QUEENS ROAD CSO EA ID / permit UUP01596 · NPSWQD010957 Outlet location SD8575000490 (OS grid reference) · View on Apple Maps WFD catchment Irk (Wince to Irwell) (GB112069061131) 2024 spills / hours 19 / 17 Long-term average 29.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	Moss Brook	15	13	down 21%	100%
Bromley Rd Coronation Rd CSO 131GZ Overflow on sewer network Company site name BROMLEY ROAD / CORONATION ROAD CSO EA ID / permit UUP00338 · 01CON0031 Outlet location SJ8638063260 (OS grid reference) · View on Apple Maps WFD catchment Dane (Cow Brook to Wheelock) (GB112068060190) 2024 spills / hours 70 / 161 Long-term average 65.0 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 13 hours spilling →	River Dane via SWS	23	13	down 67%	96%
Whitworth SSO Overflow on sewer network Company site name Cowm Park Way South EA ID / permit UUP02123 · 016950443 Outlet location SD8830017880 (OS grid reference) · View on Apple Maps WFD catchment Spodden (GB112069064730) 2024 spills / hours 5 / 9.0 Long-term average 4.0 spills a year (monitored since 2024) Monitor below 90% Sensor failure / issue · Resolved - Sep Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	River Spodden	3	13	down 40%	71%
97 Wood Lane CSO Overflow on sewer network Company site name 97 Wood Lane CSO EA ID / permit UUP00066 · 016892443 Outlet location SJ2555788174 (OS grid reference) · View on Apple Maps WFD catchment The Birket including Arrowe Brook and Fender (GB112068060530) 2024 spills / hours 18 / 22 Long-term average 16.5 spills a year (monitored since 2024) Monitor below 90% Sensor failure / issue · Resolved - Apr Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	Arrowe Brook Trib R. Birkett	15	13	down 17%	83%
Church Wharfe CSO 073BW Overflow on sewer network Company site name CHURCH WHARF CSO EA ID / permit UUP00489 · 01BOL0131 Outlet location SD7215009280 (OS grid reference) · View on Apple Maps WFD catchment Middle Brook (GB112069064540) 2024 spills / hours 30 / 15 Long-term average 38.8 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 13 hours spilling →	Clvrt Sec River Croal Minor	21	13	down 30%	100%
Gorse St Combined Sewer Overflow Overflow on sewer network Company site name Gorse Street CSO EA ID / permit UUP00815 · NPSWQD010750 Outlet location SD6988328677 (OS grid reference) · View on Apple Maps WFD catchment Blakewater (GB112071065310) 2024 spills / hours 25 / 20 Long-term average 60.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	River Darwen	18	13	down 28%	100%
Garstang Road Bridge CSO 333EH Overflow on sewer network Company site name Garstang Road Bridge CSO EA ID / permit UUP00775 · 017190865 Outlet location SD5327031770 (OS grid reference) · View on Apple Maps WFD catchment Savick Brook (GB112071065470) Bathing water St Annes 2024 spills / hours 12 / 12 Long-term average 11.3 spills a year (monitored since 2017) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	Savick Brook	11	13	down 8%	99%
Moss Bank Way/Chippings W Overflow on sewer network Company site name Moss Bank Way/Chippings Road CSO EA ID / permit UUP01346 · 01BOL0077 Outlet location SD6894010890 (OS grid reference) · View on Apple Maps WFD catchment Astley Brook (Irwell) (GB112069064560) 2024 spills / hours 82 / 602 Long-term average 45.0 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	Astley Brook	8	13	down 90%	99%
Stanney Road CSO Overflow on sewer network Company site name Stanney Road CSO EA ID / permit UUP01844 · NPSWQD010735 Outlet location SD9127013620 (OS grid reference) · View on Apple Maps WFD catchment Roch (Source to Spodden) (GB112069064720) 2024 spills / hours 8 / 8.7 Long-term average 6.8 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 13 hours spilling →	Stanney Brook	4	13	down 50%	100%
Owen Road Combined Sewer Overflow Overflow on sewer network Company site name Owen Road CSO EA ID / permit UUP01494 · 017280424 Outlet location SD4788062360 (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 8 / 3.8 Long-term average 6.3 spills a year (monitored since 2017) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 12 hours spilling →	River Lune	9	12	up 13%	100%
Hag End Brow CSO Overflow on sewer network Company site name Hag End Brow CSO EA ID / permit UUP00872 · 016993783 Outlet location SD7327008350 (OS grid reference) · View on Apple Maps WFD catchment Tonge (GB112069064530) 2024 spills / hours 30 / 18 Long-term average 41.2 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 12 hours spilling →	River Tonge	19	12	down 37%	99%
Holden Fold Lane CSO Overflow on sewer network Company site name Holden Fold Lane CSO EA ID / permit UUP00974 · 016941057 Outlet location SD9161007190 (OS grid reference) · View on Apple Maps WFD catchment Irk (Sourtce to Wince Brook) (GB112069061161) 2024 spills / hours 13 / 12 Long-term average 14.0 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 12 hours spilling →	Luzley Brrok	10	12	down 23%	100%
Brinnington Rise CSO 431GD Overflow on sewer network Company site name Brinnington Rise CSO EA ID / permit UUP00328 · 016940358 Outlet location SJ9064091850 (OS grid reference) · View on Apple Maps WFD catchment Tame (Swineshaw Brook to Mersey) (GB112069061112) 2024 spills / hours 6 / 10 Long-term average 7.6 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 12 hours spilling →	River Tame	4	12	down 33%	99%
Gilford Park CSO (10542) Overflow on sewer network Company site name Gilford Park CSO EA ID / permit UUP00790 · 017670037 Outlet location NY4138053680 (OS grid reference) · View on Apple Maps WFD catchment Petteril d/s Blackrack Beck (GB102076074030) 2024 spills / hours 10 / 11 Long-term average 12.2 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 12 hours spilling →	River Petteril	13	12	up 30%	100%
108-110 Water Street CSO (BRY0139) Overflow on sewer network Company site name 106 Water Street CSO (099KN) EA ID / permit UUP02252 · EPRJB3598EB Outlet location SD7799307387 (OS grid reference) · View on Apple Maps WFD catchment Manchester, Bolton and Bury Canal (GB71210501) 2024 spills / hours 10 / 18 Long-term average 8.5 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 12 hours spilling →	Manchester, Bolton & Bury Canal	7	12	down 30%	98%
Melbourne Terrace CSO Overflow on sewer network Company site name Melbourne Terrace CSO EA ID / permit UUP01279 · 01ALL0089 Outlet location NX9957025470 (OS grid reference) · View on Apple Maps WFD catchment Solway Outer South (GB641211630003) 2024 spills / hours 21 / 4.7 Long-term average 27.4 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 12 hours spilling →	Unnamed Trib of River Wyre	25	12	up 19%	100%
Punch Bowl Hotel (Askham) CSO Overflow on sewer network Company site name Punch Bowl Hotel (Askham) CSO EA ID / permit UUP01590 · 01EDE0008 Outlet location NY5159023780 (OS grid reference) · View on Apple Maps WFD catchment Lowther (Lower) (GB102076071010) 2024 spills / hours 17 / 30 Long-term average 15.4 spills a year (monitored since 2021) Monitor below 90% Comms failure / issue · Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 12 hours spilling →	Askham Beck	17	12	no change	82%
Whitegates Pumping Station Storm discharge at pumping station Company site name Whitegates pumping station (41004) (STA0099) EA ID / permit UUP02116 · 016881660 Outlet location SJ8874060170 (OS grid reference) · View on Apple Maps WFD catchment Biddulph Brook (GB112068055360) 2024 spills / hours 5 / 12 Long-term average 10.9 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 12 hours spilling →	Biddulph Brook	5	12	no change	100%
Hollinwood Cemetery CSO Overflow on sewer network Company site name Hollinwood Cemetry CSO EA ID / permit UUP00975 · 01OLD0074 Outlet location SD9116001881 (OS grid reference) · View on Apple Maps WFD catchment Medlock (Lumb Brook to Irwell) (GB112069061152) 2024 spills / hours 5 / 5.2 Long-term average 15.3 spills a year (monitored since 2020) Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 12 hours spilling →	Lords Brook	5	12	no change	99%
Bickershaw Lane CSO 501D5 Overflow on sewer network Company site name Bickershaw Lane Opposite Pear Tree CSO EA ID / permit UUP00229 · 016982784 Outlet location SD6161002240 (OS grid reference) · View on Apple Maps WFD catchment Hey/Borsdane Brook (GB112069064520) 2024 spills / hours 9 / 16 Long-term average 17.8 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 12 hours spilling →	Trib Brookside Brook	8	12	down 11%	100%
South of Peel Terrace CSO Overflow on sewer network Company site name South of Peel Terrace, Chester Road, MHT (Outlet 2) EA ID / permit UUP01788 · 01TRA0052 Outlet location SJ7945093410 (OS grid reference) · View on Apple Maps WFD catchment Mersey (upstream of Manchester Ship Canal) (GB112069061030) 2024 spills / hours – / – 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 12 hours spilling →	River Mersey	3	12		98%

Sewage treatment works

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

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