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
Green Dragon Hotel CSO 481EC Overflow on sewer network Company site name GREEN DRAGON HOTEL CSO EA ID / permit UUP00846 · 01WAR0067 Outlet location SJ7021088750 (OS grid reference) · View on Apple Maps WFD catchment Bollin (Ashley Mill to Manchester Ship Canal) (GB112069061382) 2024 spills / hours 37 / 190 Long-term average 30.2 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 60 hours spilling →	River Bollin	19	60	down 49%	99%
Hesket Newmarket Pumping Station Storm discharge at pumping station Company site name Hesket Newmarket Pumping Station (02509) (ALL0119) EA ID / permit UUP00942 · 017680308 Outlet location NY3416038780 (OS grid reference) · View on Apple Maps WFD catchment Caldew (Hesket Newmarket) (GB102076073730) 2024 spills / hours 19 / 46 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 60 hours spilling →	River Caldew	26	60	up 37%	100%
Sledmoor Road CSO (MAN0387) Overflow on sewer network Company site name Sledmoor Road CSO EA ID / permit UUP01771 · 016982979 Outlet location SJ8141091950 (OS grid reference) · View on Apple Maps WFD catchment Mersey (upstream of Manchester Ship Canal) (GB112069061030) 2024 spills / hours 0 / 0.0 Long-term average 17.0 spills a year (monitored since 2024) 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 60 hours spilling →	River Mersey	34	60	up from 0	100%
Foxfield Sewage Pumping Station Storm discharge at pumping station Company site name Foxfield PS EA ID / permit UUP00756 · 017480180 Outlet location SD2096085270 (OS grid reference) · View on Apple Maps WFD catchment DUDDON (GB531207411800) Bathing water Haverigg 2024 spills / hours 18 / 151 Long-term average 19.0 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 60 hours spilling →	Duddon Estuary	13	60	down 28%	100%
Factory Lane CSO Overflow on sewer network Company site name Factory Lane CSO EA ID / permit UUP00711 · 017190147 Outlet location SD5399027460 (OS grid reference) · View on Apple Maps WFD catchment RIBBLE - transitional (GB531207112400) Bathing water St Annes Shellfish water Ribble 2024 spills / hours 26 / 94 Long-term average 30.1 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 60 hours spilling →	Boundary Brook, a tributary of the River Ribble	17	60	down 35%	97%
Whittle Brook PS Storm discharge at pumping station Company site name Whittle Brook PS EA ID / permit UUP02121 · EPRCP3822XM Outlet location SJ5773087300 (OS grid reference) · View on Apple Maps WFD catchment MERSEY - Transitional (GB531206908100) 2024 spills / hours 32 / 58 Long-term average 28.0 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 59 hours spilling →	Mersey Estuary	22	59	down 31%	100%
Preston New Road Overflow on sewer network Company site name Yew Tree Drive CSO EA ID / permit UUP01573 · 017091436 Outlet location SD6564029540 (OS grid reference) · View on Apple Maps WFD catchment Darwen - conf Roddlesworth to tidal (GB112071065300) 2024 spills / hours 34 / 54 Long-term average 62.0 spills a year (monitored since 2021) 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 59 hours spilling →	Trib of Arley Brook	36	59	up 6%	99%
Robin Hood (Leigh) Pumping Station Storm discharge at pumping station Company site name Robin Hood PS EA ID / permit UUP01668 · 016993569 Outlet location SJ6468098300 (OS grid reference) · View on Apple Maps WFD catchment Hey/Borsdane Brook (GB112069064520) 2024 spills / hours 57 / 54 Long-term average 53.4 spills a year (monitored since 2021) 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 59 hours spilling →	Hey Brook	36	59	down 37%	100%
Kirkhall Lane/Victoria Street CSO Overflow on sewer network Company site name Kirkhall Lane/Victoria Street CSO EA ID / permit UUP01083 · EPRQB3595RE Outlet location SD6501001510 (OS grid reference) · View on Apple Maps WFD catchment Westleigh Brook (GB112069060820) 2024 spills / hours 45 / 60 Long-term average 50.5 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 59 hours spilling →	Westleigh Brook	41	59	down 9%	100%
Regent Road (Bolton) CSO Overflow on sewer network Company site name Regent Road EA ID / permit UUP01645 · EPRQB3499VB Outlet location SD6732008590 (OS grid reference) · View on Apple Maps WFD catchment Middle Brook (GB112069064540) 2024 spills / hours 45 / 74 Long-term average 42.7 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 59 hours spilling →	Bessy Brook via SWS	25	59	down 44%	91%
Thewlis Street CSO Overflow on sewer network Company site name Thewlis Street CSO EA ID / permit UUP01926 · 01WAR0060 Outlet location SJ5950087910 (OS grid reference) · View on Apple Maps WFD catchment MERSEY - Transitional (GB531206908100) 2024 spills / hours 39 / 34 Long-term average 38.0 spills a year (monitored since 2024) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Comms failure / issue · Resolved - Dec Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 58 hours spilling →	River Mersey	37	58	down 5%	68%
Gathurst Lane Shevington CSO Storm discharge at pumping station Company site name Gathurst PS EA ID / permit UUP00783 · 017091564 Outlet location SD5401007370 (OS grid reference) · View on Apple Maps WFD catchment Douglas - Lower (GB112070064820) 2024 spills / hours 42 / 86 Long-term average 43.6 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 58 hours spilling →	River Douglas	24	58	down 43%	100%
Grange Over Sands WwTW Inlet overflow at sewage works Sewage works Grange Over Sands Company site name GRANGE-OVER-SANDS WwTW EA ID / permit UUP00826 · 017370128 Outlet location SD3926075060 (OS grid reference) · View on Apple Maps WFD catchment KENT - transitional (GB531207312000) Bathing water Morecambe North; Morecambe South 2024 spills / hours 57 / 44 Long-term average 53.8 spills a year (monitored since 2017) 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 58 hours spilling →	Kent Estuary (Morecambe Bay Estuary)	52	58	down 9%	100%
Scale Hall Pumping Station Storm discharge at pumping station Company site name Scale Hall PS EA ID / permit UUP01723 · 017270196 Outlet location SD4643062240 (OS grid reference) · View on Apple Maps WFD catchment LUNE - transitional (GB531207212100) Bathing water Morecambe South Shellfish water Morecambe Bay East; Lune (Broadfleet and Plover Scar) 2024 spills / hours 32 / 107 Long-term average 65.0 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 58 hours spilling →	River Lune Estuary (via surface water sewer)	17	58	down 47%	100%
Ladybridge Lane CSO Overflow on sewer network Company site name Ladybridge Lane (Near Ladybridge Brow) CSO EA ID / permit UUP01097 · 01BOL0118 Outlet location SD6864008920 (OS grid reference) · View on Apple Maps WFD catchment Middle Brook (GB112069064540) 2024 spills / hours 27 / 97 Long-term average 37.5 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 58 hours spilling →	Middle Brook	22	58	down 19%	100%
Lytham Pumping Station Storm discharge at pumping station Company site name Lytham PS EA ID / permit UUP01215 · 017160106 Outlet location SD3835027650 (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 46 / 119 Long-term average 47.3 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 57 hours spilling →	Liggard Brook/ Main Drain, a tributary of the River Ribble Estuary	28	57	down 39%	100%
Lancaster Rd Radcliffe Rd CSO 372CC Overflow on sewer network Company site name Lancaster/Radcliffe Road EA ID / permit UUP01100 · 01SAL0075 Outlet location SJ7840099700 (OS grid reference) · View on Apple Maps WFD catchment Irwell / Manchester Ship Canal (Irk to confluence with Upper Mersey) (GB112069061452) 2024 spills / hours 73 / 95 Long-term average 49.4 spills a year (monitored since 2020) 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 57 hours spilling →	Gilda Brook	50	57	down 32%	99%
Skelmersdale WwTW Storm tank at sewage works Sewage works Skelmersdale Company site name SKELMERSDALE WwTW EA ID / permit UUP01762 · 017020107 Outlet location SD4817412024 (OS grid reference) · View on Apple Maps WFD catchment Douglas - Lower (GB112070064820) Bathing water St Annes Shellfish water Ribble 2024 spills / hours 12 / 48 Long-term average 33.5 spills a year (monitored since 2017) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 57 hours spilling →	River Douglas	12	57	no change	100%
Cookesmere Lane Storm discharge at pumping station Company site name Cooksmere Lane PS EA ID / permit UUP00535 · 01CON0070 Outlet location SJ7502061790 (OS grid reference) · View on Apple Maps WFD catchment Croco (GB112068055460) 2024 spills / hours 16 / 71 Long-term average 16.1 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 57 hours spilling →	Trib of the River Croco	12	57	down 25%	100%
Golden Hill Lane CSO Overflow on sewer network EA ID / permit UUP00813 · 01SRI0022 Outlet location SD5292022820 (OS grid reference) · View on Apple Maps WFD catchment Lostock DS Farington Weir (GB112070064912) 2024 spills / hours 44 / 83 Long-term average 35.4 spills a year (monitored since 2021) 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 57 hours spilling →	River Lostock	32	57	down 27%	100%
Wallacre Road CSO Overflow on sewer network Company site name Wallacre Road CSO EA ID / permit UUP02007 · 016892470 Outlet location SJ2914991650 (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 34 / 65 Long-term average 33.8 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 56 hours spilling →	Bidston Stream a trib of the River Birket	31	56	down 9%	100%
Railway Farm CSO 25051 Overflow on sewer network Company site name Railway Farm Combined Sewer Overflow (Site ID 25051) (LAN0031) EA ID / permit UUP01604 · 017220120 Outlet location SD4808055240 (OS grid reference) · View on Apple Maps WFD catchment Conder (GB112072065900) Bathing water Morecambe South Shellfish water Lune (Broadfleet and Plover Scar) 2024 spills / hours 24 / 60 Long-term average 22.4 spills a year (monitored since 2017) Monitor below 90% Sensor failure / issue · Resolved - January after reporting year Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 56 hours spilling →	The River Conder	23	56	down 4%	75%
Hibel Road CSO 27075 Overflow on sewer network Company site name Hibel Road CSO EA ID / permit UUP00953 · 016982179 Outlet location SJ9177074450 (OS grid reference) · View on Apple Maps WFD catchment Bollin (Source to Dean) (GB112069061320) 2024 spills / hours 15 / 56 Long-term average 22.0 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 56 hours spilling →	River Bollin	18	56	up 20%	100%
Failsworth WwTW Inlet overflow at sewage works Sewage works Failsworth Company site name FAILSWORTH WwTW EA ID / permit UUP00714 · 016983268 Outlet location SJ8960099710 (OS grid reference) · View on Apple Maps WFD catchment Medlock (Lumb Brook to Irwell) (GB112069061152) 2024 spills / hours 36 / 151 Long-term average 39.8 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 56 hours spilling →	The River Medlock	8	56	down 78%	100%
Harrison Road Wagon and Horse CSO Overflow on sewer network Company site name Harrisons Road Wagon & Horses CSO EA ID / permit UUP00904 · 017091496 Outlet location SD6017012550 (OS grid reference) · View on Apple Maps WFD catchment Douglas - Upper (GB112070064850) 2024 spills / hours 34 / 89 Long-term average 54.1 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 56 hours spilling →	River Douglas	43	56	up 26%	100%
Cleveland Drive CSO Overflow on sewer network Company site name Cleveland Drive CSO EA ID / permit UUP00499 · 016983353 Outlet location SJ5854499576 (OS grid reference) · View on Apple Maps WFD catchment Millingford (Newton) Brook (GB112069061220) 2024 spills / hours 40 / 68 Long-term average 45.7 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 56 hours spilling →	Millingford Brook	35	56	down 13%	100%
Shore Road Network Pumping Station Storm discharge at pumping station Company site name Shore Road Wastewater Network PS(Site ID 49065) (WLN0008) EA ID / permit UUP01754 · 017081186 Outlet location SD4375023810 (OS grid reference) · View on Apple Maps WFD catchment RIBBLE - transitional (GB531207112400) Bathing water St Annes 2024 spills / hours 53 / 110 Long-term average 30.9 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 55 hours spilling →	Dunkirk Dib	33	55	down 38%	100%
Low Hesket WwTW Inlet overflow at sewage works Sewage works Low Hesket Company site name LOW HESKET WwTW EA ID / permit UUP01196 · 017670104 Outlet location NY4603045550 (OS grid reference) · View on Apple Maps WFD catchment Petteril d/s Blackrack Beck (GB102076074030) 2024 spills / hours 10 / 43 Long-term average 35.3 spills a year (monitored since 2020) Investigation Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 55 hours spilling →	River Petteril	24	55	up 140%	100%
Billy'S Lane CSO Overflow on sewer network Company site name Billy's Lane CSO EA ID / permit UUP00240 · 016982767 Outlet location SJ8703086160 (OS grid reference) · View on Apple Maps WFD catchment Micker Brook (GB112069060940) 2024 spills / hours 26 / 37 Long-term average 40.8 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 55 hours spilling →	Turves Brook,Trib Micker Brook	26	55	no change	99%
Albyn Street East CSO 33102 Overflow on sewer network Company site name Albyn Street East CSO EA ID / permit UUP00097 · 017160851 Outlet location SD5493029330 (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 5 / 32 Long-term average 12.9 spills a year (monitored since 2017) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 55 hours spilling →	Swill Brook Culvert, a tributary of River Ribble	4	55	down 20%	100%
Applegarth Storm discharge at pumping station Company site name Moor Lane PS / Rowton A41 CSO EA ID / permit UUP00125 · 01CHE0023 Outlet location SJ4473064730 (OS grid reference) · View on Apple Maps WFD catchment Finchetts Gutter (GB111067056930) 2024 spills / hours 19 / 164 Long-term average 11.0 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 55 hours spilling →	Caldy Brook River Dee	5	55	down 74%	93%
Kirkham Combined Sewer Overflow Overflow on sewer network Company site name Kirkham CSO EA ID / permit UUP01084 · 017180578 Outlet location SD4248032450 (OS grid reference) · View on Apple Maps WFD catchment Dow Brook (GB112071065670) Bathing water St Annes Shellfish water Ribble 2024 spills / hours 19 / 70 Long-term average 22.3 spills a year (monitored since 2017) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 55 hours spilling →	Carr Brook a tributary of Dow Brook	18	55	down 5%	100%
Honey Holme Lane CSO Overflow on sewer network Company site name Honey Holme Lane CSO EA ID / permit UUP00985 · 01BUR0014 Outlet location SD8694029140 (OS grid reference) · View on Apple Maps WFD catchment Calder - headwaters to conf Brun (GB112071065060) 2024 spills / hours 24 / 82 Long-term average 58.3 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 55 hours spilling →	River Calder	20	55	down 17%	99%
Pardshaw STW Storm tank at sewage works Sewage works Pardshaw Company site name PARDSHAW WwTW EA ID / permit UUP01506 · 017570049 Outlet location NY0990024680 (OS grid reference) · View on Apple Maps WFD catchment Marron (GB112075070540) 2024 spills / hours 54 / 90 Long-term average 49.6 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 54 hours spilling →	Black Beck	31	54	down 43%	100%
Front Street CSO 13521 Overflow on sewer network Company site name FRONT STREET CSO EA ID / permit UUP00765 · 01CON0047 Outlet location SJ7611060680 (OS grid reference) · View on Apple Maps WFD catchment Arclid Brook (GB112068055430) 2024 spills / hours 42 / 49 Long-term average 21.2 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 54 hours spilling →	Arclid Brook	40	54	down 5%	100%
Rilshaw Lane Pumping Station VRY004 Storm discharge at pumping station Company site name Rilshaw Lane PS EA ID / permit UUP01656 · 016881635 Outlet location SJ6703065880 (OS grid reference) · View on Apple Maps WFD catchment Weaver (Valley Brook to Winsford Flashes) (GB112068060462) 2024 spills / hours 78 / 368 Long-term average 62.4 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 54 hours spilling →	Ditch Course	21	54	down 73%	99%
Meathop Pumping Station Storm discharge at pumping station Company site name Meathop PS EA ID / permit UUP01272 · 017380417 Outlet location SD4415080530 (OS grid reference) · View on Apple Maps WFD catchment KENT - transitional (GB531207312000) 2024 spills / hours 0 / 0.0 Long-term average 12.3 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 54 hours spilling →	Meathop Marsh Drain	6	54	up from 0	100%
Sedgwick Pumping Station Storm discharge at pumping station Company site name Sedgewick PS EA ID / permit UUP01734 · 017370060 Outlet location SD5083087230 (OS grid reference) · View on Apple Maps WFD catchment Kent - conf Sprint to tidal (GB112073071460) 2024 spills / hours 37 / 43 Long-term average 21.9 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 54 hours spilling →	River Kent	41	54	up 11%	100%
Behind 33 the Orchard CSO 123KF Overflow on sewer network Company site name Behind 33 The Orchard CSO EA ID / permit UUP00215 · 01CHR0008 Outlet location SD4910019080 (OS grid reference) · View on Apple Maps WFD catchment Lostock DS Farington Weir (GB112070064912) 2024 spills / hours 21 / 93 Long-term average 25.0 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 54 hours spilling →	Trib of River Lostock	21	54	no change	98%
The Grange Congleton CSO Overflow on sewer network Company site name The Grange (Congleton) Combined Sewer Overflow (Site ID 132UW) (CON0032) EA ID / permit UUP01921 · 01CON0032 Outlet location SJ8604063240 (OS grid reference) · View on Apple Maps WFD catchment Dane (Cow Brook to Wheelock) (GB112068060190) 2024 spills / hours 72 / 145 Long-term average 54.7 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 53 hours spilling →	River Dane via SWS	40	53	down 44%	100%
Galloper Pool PS Storm discharge at pumping station Company site name Galloper Pool PS EA ID / permit UUP00769 · 017680341 Outlet location NY6150004601 (OS grid reference) · View on Apple Maps WFD catchment Lune - conf Birk Beck to conf Rawthey (GB112072071720) 2024 spills / hours 107 / 99 Long-term average 87.5 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 53 hours spilling →	Galloper Pool	18	53	down 83%	99%
Clover Road Butterworth Brow CSO Overflow on sewer network Company site name Clover Road/Butterworth Brow CSO EA ID / permit UUP00514 · 01CHR0023 Outlet location SD5683015940 (OS grid reference) · View on Apple Maps WFD catchment Yarrow DS Big Lodge Water (GB112070064952) 2024 spills / hours 71 / 177 Long-term average 61.7 spills a year (monitored since 2019) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 53 hours spilling →	SWS to River Yarrow	37	53	down 48%	97%
Sandle Bridge Ww Network PS Storm discharge at pumping station Company site name Sandle Bridge Wastewater Network PS EA ID / permit UUP01715 · 016892278 Outlet location SJ8072076830 (OS grid reference) · View on Apple Maps WFD catchment Birkin Brook - Source to Mobberley Brook (GB112069061340) 2024 spills / hours 8 / 27 Long-term average 5.7 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 53 hours spilling →	Pedley Brook	7	53	down 13%	97%
Manchester Rd Dalesford Rd 362EJ Overflow on sewer network Company site name Manchester Road/Dalesford Road EA ID / permit UUP01230 · 01ROS0011 Outlet location SD7890022521 (OS grid reference) · View on Apple Maps WFD catchment Irwell (Cowpe Bk to Rossendale STW) (GB112069064641) 2024 spills / hours 96 / 171 Long-term average 83.2 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 53 hours spilling →	Rvr Irwell via Langwood Brook	58	53	down 40%	99%
CSO Upstream of Brampton WwTW Overflow on sewer network Company site name Brampton CSO (Upstream of Carlisle WwTW) EA ID / permit UUP00586 · NPSWQD002928 Outlet location NY5087260894 (OS grid reference) · View on Apple Maps WFD catchment Irthing DS Crammel Linn Waterfall (GB102076073981) 2024 spills / hours 25 / 16 Long-term average 21.4 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 53 hours spilling →	Brampton Beck	33	53	up 32%	100%
Millgate CSO 35025 Overflow on sewer network Company site name Millgate CSO EA ID / permit UUP01321 · 01ROC0072 Outlet location SD9116014680 (OS grid reference) · View on Apple Maps WFD catchment Roch (Source to Spodden) (GB112069064720) 2024 spills / hours 43 / 95 Long-term average 64.0 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 53 hours spilling →	River Roch	26	53	down 40%	98%
Lowe Mill Lane (Hindley) CSO Overflow on sewer network Company site name Lowe Mill Lane (Hindley) CSO EA ID / permit UUP01201 · NPSWQD006473 Outlet location SD6193004410 (OS grid reference) · View on Apple Maps WFD catchment Hey/Borsdane Brook (GB112069064520) 2024 spills / hours 18 / 22 Long-term average 21.4 spills a year (monitored since 2021) 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 53 hours spilling →	Borsdane Brook	39	53	up 117%	100%
North Road CSO (212IL) Overflow on sewer network Company site name North Road CSO EA ID / permit UUP01405 · 016982640 Outlet location SK0309094530 (OS grid reference) · View on Apple Maps WFD catchment Crookhurst Beck (GB112075073660) 2024 spills / hours 31 / 109 Long-term average 53.1 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 52 hours spilling →	Unnamed Trib of Sandwith Beck	35	52	up 13%	99%
Delph New Road/Station Approach CSO Overflow on sewer network Company site name Delph New Road/Station SSO EA ID / permit UUP00628 · 016982525 Outlet location SD9873007430 (OS grid reference) · View on Apple Maps WFD catchment Tame (Source to Chew Brook) (GB112069064741) 2024 spills / hours 4 / 6.0 Long-term average 106.5 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 52 hours spilling →	River Tame	14	52	up 250%	96%
Great Harwood (Hynburn Rd)CSO 22017 Overflow on sewer network Company site name Great Harwood (Hyndbunr Rd) CSO EA ID / permit UUP00841 · 017160127 Outlet location SD7470032330 (OS grid reference) · View on Apple Maps WFD catchment Hyndburn Brook - Lower (GB112071065070) 2024 spills / hours 52 / 72 Long-term average 52.6 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 52 hours spilling →	Hyndburn Brook	37	52	down 29%	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.