Storm overflow register · 2025 annual return

Anglian Water storm overflows, 2025

Anglian Water reported 1,442 storm overflows in England for 2025. Together they recorded 17,322 spills over 105,806 hours, an average of 12.0 spills per overflow against 20.4 across England. That ranks 1 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 61% on 2024.

244 overflows did not spill · 38 spilled more than 60 times · 1,323 had monitors working for 90% of the year or more · 419 sewage treatment works with overflows

Hours spilling by month, 2025

Hours spilling, all Anglian Water overflows, from the start/stop records. Spills running across a month end are split between the months.

All Anglian Water 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
Great Easton(Leics) STW Storm tank at sewage works Sewage works Great Easton Company site name GREAT EASTON STW (LEICS) EA ID / permit AWS00497 · AW5NF768 Outlet location SP8534092510 (OS grid reference) · View on Apple Maps WFD catchment Welland - conf Langton Bk to conf Gwash (GB105031050580) 2024 spills / hours 183 / 3,776 Long-term average 123.4 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,895 hours spilling →	River Welland Nt	111	1,895	down 39%	100%
Foxton (Cambs) WRC Inlet overflow at sewage works Sewage works Foxton Company site name Foxton WRC (Cambs) EA ID / permit AWS01557 · AW1NF/964 Outlet location TL4014049560 (OS grid reference) · View on Apple Maps WFD catchment Rhee (DS Wendy) (GB105033037610) 2024 spills / hours 188 / 4,487 Long-term average 145.0 spills a year (monitored since 2024) High-spill reason (company) Performance - SW Infiltration Monitor below 90% Telemetry or data archiving failure / issue · Resolved - January after reporting year Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed, Bathing Water and/or Shellfish Water investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 1,645 hours spilling →	River Rhee	102	1,645	down 46%	87%
Nettleham STW Storm tank at sewage works Sewage works Nettleham EA ID / permit AWS00873 · ANNNF13387 Outlet location TF0192075880 (OS grid reference) · View on Apple Maps WFD catchment Nettleham Beck (GB105030062210) 2024 spills / hours 114 / 2,090 Long-term average 105.5 spills a year (monitored since 2022) 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 1,585 hours spilling →	Nettleham Beck	109	1,585	down 4%	100%
Great Oxendon STW Storm tank at sewage works Sewage works Great Oxendon EA ID / permit AWS00505 · AWNNF13652 Outlet location SP7360082300 (OS grid reference) · View on Apple Maps WFD catchment Ise - Upper (GB105032045200) 2024 spills / hours 154 / 3,206 Long-term average 109.0 spills a year (monitored since 2022) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 1,548 hours spilling →	River Ise	88	1,548	down 43%	95%
Ramsey Water Recycling Centre Storm tank at sewage works Sewage works Ramsey Company site name RAMSEY STW EA ID / permit AWS01027 · AWCNF1171 Outlet location TL2852086300 (OS grid reference) · View on Apple Maps WFD catchment Middle Level (GB205033000050) 2024 spills / hours 236 / 3,430 Long-term average 175.0 spills a year (monitored since 2023) 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 1,432 hours spilling →	The Ramsey High Lode	145	1,432	down 39%	99%
Pertenhall STW Storm tank at sewage works Sewage works Pertenhall EA ID / permit AWS00980 · AW1NF2724 Outlet location TL0879864594 (OS grid reference) · View on Apple Maps WFD catchment Pertenhall Brook (GB105033042960) 2024 spills / hours 165 / 3,275 Long-term average 96.6 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,273 hours spilling →	Keysoe Brook. River Kym Nt	80	1,273	down 52%	99%
Whaddon Water Recycling Centre Storm tank at sewage works Sewage works Whaddon Company site name WHADDON STW EA ID / permit AWS01486 · AWCNF11058 Outlet location SP8114034430 (OS grid reference) · View on Apple Maps WFD catchment Weald Brook (GB105033037870) 2024 spills / hours 171 / 3,244 Long-term average 118.0 spills a year (monitored since 2020) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,250 hours spilling →	Calverton Brook	73	1,250	down 57%	100%
Welton N'Hant Water Recycling Cntr Storm tank at sewage works Sewage works Welton N Hant Water Recycling Cntr Company site name WELTON STW (NORTHANTS) EA ID / permit AWS01466 · AW5NF204 Outlet location SP5886065640 (OS grid reference) · View on Apple Maps WFD catchment Welton Village Trib, Whilton branch of R. Nene (GB105032045360) 2024 spills / hours 247 / 5,500 Long-term average 135.5 spills a year (monitored since 2022) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,239 hours spilling →	Whilton Branch R Nene (Nt)	99	1,239	down 60%	99%
Hollowell Water Recycling Centre Storm tank at sewage works Sewage works Hollowell Company site name HOLLOWELL STW EA ID / permit AWS00611 · AW5NF254 Outlet location SP6947071890 (OS grid reference) · View on Apple Maps WFD catchment Hollowell Arm of Spratton Brook (GB105032045510) 2024 spills / hours 191 / 3,585 Long-term average 103.0 spills a year (monitored since 2022) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,190 hours spilling →	Brampton Branch R.Nene Nt	61	1,190	down 68%	100%
Hallaton STW Storm tank at sewage works (with treatment) Sewage works Hallaton EA ID / permit AWS00552 · AWNNF1287 Outlet location SP7950096000 (OS grid reference) · View on Apple Maps WFD catchment Medbourne Brook (GB105031050520) Treatment Reed bed 2024 spills / hours 220 / 2,994 Long-term average 162.5 spills a year (monitored since 2022) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 1,126 hours spilling →	Medbourne Brook River Welland	155	1,126	down 30%	100%
Newnham(Northants) WRC Storm tank at sewage works Sewage works Newnham Company site name NEWNHAM STW (NORTHANTS) EA ID / permit AWS00878 · AW5NF400 Outlet location SP5827059150 (OS grid reference) · View on Apple Maps WFD catchment Nene - headwaters to conf Whilton Branch (GB105032045310) 2024 spills / hours 137 / 2,455 Long-term average 82.0 spills a year (monitored since 2020) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement UWWTR improvement ongoing, Operational improvement completed Volume & pollution Estimate from 1,099 hours spilling →	Kislingbury Branch R.Nene Nt	76	1,099	down 45%	100%
Hanslope STW Storm tank at sewage works Sewage works Hanslope EA ID / permit AWS00554 · AW1NF1066 Outlet location SP7945047290 (OS grid reference) · View on Apple Maps WFD catchment Tove (DS Greens Norton) (GB105033038180) 2024 spills / hours 152 / 2,515 Long-term average 103.0 spills a year (monitored since 2023) High-spill reason (company) Performance - Partial / no capacity due to blockage or restriction (e.g. roots / grid) - maintenance issue Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 984 hours spilling →	River Tove	69	984	down 55%	99%
Leadenham STW Storm tank at sewage works Sewage works Leadenham EA ID / permit AWS00718 · ANNNF13061 Outlet location SK9540053220 (OS grid reference) · View on Apple Maps WFD catchment Brant - Lower (GB105030056770) 2024 spills / hours 118 / 2,117 Long-term average 64.8 spills a year (monitored since 2022) High-spill reason (company) Performance - Other maintenance / capital works (e.g. jetting) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 935 hours spilling →	unnamed tributary R Brant	49	935	down 58%	100%
Marston Moretaine WRC Storm tank at sewage works Sewage works Marston Moretaine Company site name MARSTON MORETAINE STW EA ID / permit AWS00823 · AW1NF3013 Outlet location TL0024041960 (OS grid reference) · View on Apple Maps WFD catchment Elstow Brook (US Shortstown) (GB105033038050) 2024 spills / hours 147 / 2,253 Long-term average 108.7 spills a year (monitored since 2023) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 914 hours spilling →	Marston Brook	76	914	down 48%	100%
Deeping Water Recycling Centre Storm tank at sewage works Sewage works Deeping Company site name Deeping Water Recycling Centre EA ID / permit AWS00324 · ANNNF13012 Outlet location TF1711008150 (OS grid reference) · View on Apple Maps WFD catchment Welland - conf Greatford Cut to tidal (GB205031050685) 2024 spills / hours 131 / 1,473 Long-term average 67.6 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 789 hours spilling →	River Welland	53	789	down 60%	99%
Knossington STW Inlet overflow at sewage works Sewage works Knossington EA ID / permit AWS00706 · AWNNF13148 Outlet location SK8070007820 (OS grid reference) · View on Apple Maps WFD catchment South Gwash (GB105031050480) 2024 spills / hours 5 / 44 Long-term average 41.0 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 780 hours spilling →	unnamed stream River Gwash	93	780	up 1760%	100%
Thealby STW Inlet overflow at sewage works Sewage works Thealby EA ID / permit AWS01362 · AW3NF383 Outlet location SE8950018200 (OS grid reference) · View on Apple Maps WFD catchment Winterton Beck from Source to the Humber (GB104029067660) 2024 spills / hours 90 / 766 Long-term average 85.0 spills a year (monitored since 2024) High-spill reason (company) Performance - Other maintenance / capital works (e.g. jetting) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 770 hours spilling →	Unknown trib.	80	770	down 11%	99%
Harlestone PS Storm discharge at pumping station Company site name HARLESTONE SP EA ID / permit AWS00562 · AWENF2360 Outlet location SP7130066200 (OS grid reference) · View on Apple Maps WFD catchment Church Brampton Arm (GB105032045380) 2024 spills / hours 157 / 3,379 Long-term average 103.5 spills a year (monitored since 2024) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 762 hours spilling →	R Nene (Whilton Branch)	50	762	down 68%	100%
Thorpe Malsor STW Inlet overflow at sewage works Sewage works Thorpe Malsor EA ID / permit AWS01373 · AWNNF13638 Outlet location SP8366078750 (OS grid reference) · View on Apple Maps WFD catchment Loddington Arm (Ise) (GB105032045150) 2024 spills / hours 192 / 2,015 Long-term average 146.3 spills a year (monitored since 2023) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 757 hours spilling →	Shutlanger Brook	118	757	down 39%	98%
Buckden Water Recycling Centre Storm tank at sewage works Sewage works Buckden Company site name BUCKDEN STW EA ID / permit AWS00164 · AWCNF11413 Outlet location TL1997067050 (OS grid reference) · View on Apple Maps WFD catchment Diddington Brook (GB105033043310) 2024 spills / hours 162 / 3,033 Long-term average 116.0 spills a year (monitored since 2023) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 731 hours spilling →	Tributary of Diddington Brook	66	731	down 59%	100%
Bozeat STW Storm tank at sewage works Sewage works Bozeat EA ID / permit AWS00110 · AW5NF421 Outlet location SP9020759231 (OS grid reference) · View on Apple Maps WFD catchment Grendon Brook (GB105032045040) 2024 spills / hours 98 / 1,494 Long-term average 60.2 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 720 hours spilling →	Grendon Brook River Nene	60	720	down 39%	94%
Ryhall Water Recycling Centre Storm tank at sewage works Sewage works Ryhall Company site name RYHALL STW EA ID / permit AWS01084 · AW5NF5213 Outlet location TF0404010700 (OS grid reference) · View on Apple Maps WFD catchment Gwash (GB105031050610) 2024 spills / hours 81 / 1,002 Long-term average 42.0 spills a year (monitored since 2022) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 706 hours spilling →	River Gwash	62	706	down 23%	100%
South Rauceby Water Recycling Centr Inlet overflow at sewage works Sewage works South Rauceby Water Recycling Centr Company site name South Rauceby Water Recycling Centre EA ID / permit AWS01160 · AW3NF148 Outlet location TF0316044850 (OS grid reference) · View on Apple Maps WFD catchment Slea (GB105030056670) 2024 spills / hours 91 / 388 Long-term average 81.0 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 672 hours spilling →	The Beck to a Trib of River Sl	71	672	down 22%	98%
Metheringham STW Storm tank at sewage works Sewage works Metheringham EA ID / permit AWS00839 · AW3NFF821 Outlet location TF0799061390 (OS grid reference) · View on Apple Maps WFD catchment Metheringham Beck (GB105030056210) 2024 spills / hours 93 / 1,237 Long-term average 76.2 spills a year (monitored since 2021) High-spill reason (company) Performance - Other maintenance / capital works (e.g. jetting) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 668 hours spilling →	Car Dyke Meth'gham Delph Rive	55	668	down 41%	100%
Silverstone STW Storm tank at sewage works Sewage works Silverstone EA ID / permit AWS01136 · AWCNF1191 Outlet location SP6708045490 (OS grid reference) · View on Apple Maps WFD catchment Silverstone Brook (GB105033038250) 2024 spills / hours 152 / 2,071 Long-term average 107.2 spills a year (monitored since 2020) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 660 hours spilling →	Tributary River Tove River Gre	69	660	down 55%	100%
Akeley (Ex STW) PS Storm discharge at pumping station Company site name AKELEY (EX STW) SP EA ID / permit AWS00010 · AWCNF417/10279 Outlet location SP7106038010 (OS grid reference) · View on Apple Maps WFD catchment Leckhampstead Brook (GB105033037960) 2024 spills / hours 110 / 1,937 Long-term average 67.4 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 653 hours spilling →	Leckhampstead Brook	47	653	down 57%	100%
Market Harborough-Riverside Road Storm tank at sewage works Sewage works Market Harborough Riverside Road Company site name MARKET HARBOROUGH STW EA ID / permit AWS00816 · AW5NF739A Outlet location SP7588088840 (OS grid reference) · View on Apple Maps WFD catchment Welland - conf Jordan to conf Langton Bk (GB105031045610) 2024 spills / hours 65 / 933 Long-term average 61.8 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 653 hours spilling →	River Welland Nt	48	653	down 26%	99%
Elm Hill Overflow Overflow on sewer network Company site name NORWICH-FYE BRIDGE (N) SSO EA ID / permit AWS00398 · AW4NF519XK Outlet location TG2330009000 (OS grid reference) · View on Apple Maps WFD catchment Wensum DS Norwich (GB105034055882) 2024 spills / hours 79 / 617 Long-term average 65.0 spills a year (monitored since 2023) 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 643 hours spilling →	Wensum Ds Norwich	70	643	down 11%	100%
Chelveston - Water Lane PS Storm discharge at pumping station Company site name CHELVESTON-WATER LANE SP EA ID / permit AWS00224 · AWNNF2203 Outlet location SP9873069530 (OS grid reference) · View on Apple Maps WFD catchment Chelveston Brook (GB105032045090) 2024 spills / hours 124 / 2,445 Long-term average 69.4 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 625 hours spilling →	River Nene	44	625	down 65%	100%
Fiskerton STW Storm tank at sewage works Sewage works Fiskerton EA ID / permit AWS00439 · ANNNF13086 Outlet location TF0535071800 (OS grid reference) · View on Apple Maps WFD catchment Witham - conf Catchwater Drain to conf Bain (GB205030062425) 2024 spills / hours 59 / 871 Long-term average 57.7 spills a year (monitored since 2023) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 620 hours spilling →	tributary North Delph	42	620	down 29%	100%
Witcham STW Storm tank at sewage works Sewage works Witcham Company site name WITCHAM WRC EA ID / permit AWS01521 · AECNF1958 Outlet location TL4707079610 (OS grid reference) · View on Apple Maps WFD catchment Old Bedford River / River Delph (inc The Hundred Foot Washes) (GB205033000060) 2024 spills / hours 29 / 344 Long-term average 33.0 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 615 hours spilling →	Witcham Catchwater River Ouse	42	615	up 45%	98%
Bolnhurst STW Storm tank at sewage works Sewage works Bolnhurst Company site name Bolnhurst WRC EA ID / permit AWS00096 · AW1NF2802 Outlet location TL0900060460 (OS grid reference) · View on Apple Maps WFD catchment Duloe Brook (GB105033043260) 2024 spills / hours 82 / 1,286 Long-term average 38.3 spills a year (monitored since 2022) High-spill reason (company) Performance - Other maintenance / capital works (e.g. jetting) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 611 hours spilling →	Duloe Brook	40	611	down 51%	100%
Titchmarsh Water Recycling Centre Storm tank at sewage works Sewage works Titchmarsh Company site name TITCHMARSH STW EA ID / permit AWS01389 · AW5NF/5212 Outlet location TL0321079760 (OS grid reference) · View on Apple Maps WFD catchment Thorpe Waterville Brook (GB105032045190) 2024 spills / hours 124 / 2,221 Long-term average 81.3 spills a year (monitored since 2022) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 611 hours spilling →	Thorpe Brook River Nene Nt	42	611	down 66%	100%
Whaddon PS Storm discharge at pumping station Company site name NASH-WHADDON ROAD (NEW) SP EA ID / permit AWS01553 · AWENF/2485 Outlet location SP7853034500 (OS grid reference) · View on Apple Maps WFD catchment Beachampton Brook (GB105033037850) 2024 spills / hours 70 / 1,013 Long-term average 52.3 spills a year (monitored since 2023) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 571 hours spilling →	Beachampton Brook	36	571	down 49%	100%
Dickleburgh Water Recycling Centre Storm tank at sewage works Sewage works Dickleburgh Company site name DICKLEBURGH-RECTORY RD STW EA ID / permit AWS00337 · AEENF2055 Outlet location TM1714082750 (OS grid reference) · View on Apple Maps WFD catchment Dickleburgh Stream (GB105034045850) 2024 spills / hours 69 / 1,243 Long-term average 50.4 spills a year (monitored since 2021) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 564 hours spilling →	River Frenze River Waveney Nt	47	564	down 32%	100%
Barton-Upon-Humber WRC Storm tank at sewage works Sewage works Barton Upon Humber Company site name BARTON ON HUMBER STW EA ID / permit AWS00062 · ANNTS13006 Outlet location TA0352023530 (OS grid reference) · View on Apple Maps WFD catchment HUMBER MIDDLE (GB530402609202) 2024 spills / hours 25 / 566 Long-term average 38.8 spills a year (monitored since 2022) High-spill reason (company) Performance - Pump failure / issue Monitor below 90% Telemetry or data archiving failure / issue · Resolved - Aug Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 559 hours spilling →	R Humber	46	559	up 84%	38%
Stanbridgeford WRC Storm tank at sewage works Sewage works Stanbridgeford Company site name STANBRIDGEFORD STW EA ID / permit AWS01274 · AW1NF2574 Outlet location SP9609022800 (OS grid reference) · View on Apple Maps WFD catchment Ouzel Brook (GB105033030530) 2024 spills / hours 160 / 3,249 Long-term average 108.3 spills a year (monitored since 2023) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 554 hours spilling →	Ouzel Brook & Trib Ouzel Bk Nt	39	554	down 76%	100%
Pumping Stn at Ivinghoe Aston STW Storm discharge at pumping station Company site name IVINGHOE ASTON STW EA ID / permit AWS01016 · AWCNF10310 Outlet location SP9467018690 (OS grid reference) · View on Apple Maps WFD catchment Whistle Brook (GB105033030490) 2024 spills / hours 131 / 2,081 Long-term average 88.0 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 550 hours spilling →	Coombe Bottom Brook, R Ouzel	45	550	down 66%	100%
Hibaldstow Water Recycling Centre Storm tank at sewage works Sewage works Hibaldstow Company site name HIBALDSTOW STW EA ID / permit AWS00592 · AW3NFF200 Outlet location SE9800004700 (OS grid reference) · View on Apple Maps WFD catchment Ancholme from Bishopbridge to the Humber (GB104029067520) 2024 spills / hours 54 / 1,036 Long-term average 33.5 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 540 hours spilling →	Hibaldstow Catchwater River An	26	540	down 52%	100%
Dunholme Water Recycling Centre Storm tank at sewage works Sewage works Dunholme Company site name DUNHOLME STW EA ID / permit AWS00359 · ANNNF10274 Outlet location TF0346079630 (OS grid reference) · View on Apple Maps WFD catchment Barlings Eau (GB105030062290) 2024 spills / hours 55 / 749 Long-term average 47.6 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 539 hours spilling →	Dunholme Beck	42	539	down 24%	100%
Coningsby Water Recycling Centre Storm tank at sewage works Sewage works Coningsby Company site name CONINGSBY STW EA ID / permit AWS00274 · ANNNF1049 Outlet location TF2144056720 (OS grid reference) · View on Apple Maps WFD catchment Bain - Lower (GB105030062450) 2024 spills / hours 87 / 1,423 Long-term average 67.2 spills a year (monitored since 2020) High-spill reason (company) Data collection - Tidal / river inundation Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 537 hours spilling →	River Bain	38	537	down 56%	100%
Everdon STW Inlet overflow at sewage works Sewage works Everdon EA ID / permit AWS00416 · AWNNF13345 Outlet location SP6031057730 (OS grid reference) · View on Apple Maps WFD catchment Everdon Brook (GB105032045290) 2024 spills / hours 183 / 1,925 Long-term average 96.4 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Comms failure / issue · Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 531 hours spilling →	Everden Brook River Nene	62	531	down 66%	84%
Grimsby Pyewipe WRC and TPS Inlet overflow at sewage works Sewage works Grimsby Pyewipe And Tps Company site name GRIMSBY-PYEWIPE SO WRC EA ID / permit AWS00529 · AW3TS519 Outlet location TA2828013140 (OS grid reference) · View on Apple Maps WFD catchment HUMBER LOWER (GB530402609201) 2024 spills / hours 198 / 932 Long-term average 171.5 spills a year (monitored since 2022) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 506 hours spilling →	The River Humber	155	506	down 22%	100%
Ulceby STW Storm tank at sewage works Sewage works Ulceby EA ID / permit AWS01414 · ANNNF13085 Outlet location TA1115016540 (OS grid reference) · View on Apple Maps WFD catchment Skitter Beck / East Halton Beck (GB104029067655) 2024 spills / hours 40 / 551 Long-term average 58.0 spills a year (monitored since 2022) High-spill reason (company) Performance - Partial / no capacity due to blockage or restriction (e.g. roots / grid) - maintenance issue Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 506 hours spilling →	tributary Skitter Beck	36	506	down 10%	100%
Towcester Water Recycling Centre Storm tank at sewage works Sewage works Towcester Company site name TOWCESTER STW EA ID / permit AWS01401 · AW1NF63 Outlet location SP7155048690 (OS grid reference) · View on Apple Maps WFD catchment Tove (DS Greens Norton) (GB105033038180) 2024 spills / hours 119 / 2,305 Long-term average 53.0 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 504 hours spilling →	River Tove River Great Ouse N	31	504	down 74%	94%
Glooston Water Recycling Centre Inlet overflow at sewage works Sewage works Glooston Company site name Glooston Water Recycling Centre EA ID / permit AWS00471 · AW5NF425 Outlet location SP7452095590 (OS grid reference) · View on Apple Maps WFD catchment Stonton Brook (GB105031050460) 2024 spills / hours 132 / 1,814 Long-term average 88.0 spills a year (monitored since 2024) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 499 hours spilling →	Tributary of the River Welland	44	499	down 67%	100%
Horncastle Water Recycling Centre Storm tank at sewage works Sewage works Horncastle Company site name HORNCASTLE STW EA ID / permit AWS00617 · ANNNF10519 Outlet location TF2595067440 (OS grid reference) · View on Apple Maps WFD catchment Bain - Lower (GB105030062450) 2024 spills / hours 69 / 1,331 Long-term average 52.0 spills a year (monitored since 2023) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 493 hours spilling →	Old River Bain	34	493	down 51%	100%
Corby STW Storm tank at sewage works Sewage works Corby EA ID / permit AWS00278 · AW5NF5179 Outlet location SP9076088840 (OS grid reference) · View on Apple Maps WFD catchment Southern Stream (GB105032045580) 2024 spills / hours 82 / 1,250 Long-term average 64.3 spills a year (monitored since 2023) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 489 hours spilling →	Willow Brook (Southern Stream)	35	489	down 57%	99%
Hemswell Raf Camp STW Storm tank at sewage works Sewage works Hemswell Raf Camp Company site name Hemswell (RAF) Camp Sewage Treatment Works EA ID / permit AWS00588 · ANNNF2068 Outlet location SK9569089940 (OS grid reference) · View on Apple Maps WFD catchment Black Dyke (trib of Ancholme) (GB104029061890) 2024 spills / hours 42 / 442 Long-term average 33.2 spills a year (monitored since 2021) High-spill reason (company) Performance - Other maintenance / capital works (e.g. jetting) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 488 hours spilling →	Trib. of Black Dyke Nt	48	488	up 14%	100%
Louth STW Storm tank at sewage works Sewage works Louth EA ID / permit AWS00772 · ANNNF1131 Outlet location TF3589090320 (OS grid reference) · View on Apple Maps WFD catchment Louth Canal (GB104029061990) 2024 spills / hours 53 / 494 Long-term average 49.8 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 486 hours spilling →	Louth Canal	40	486	down 25%	100%

Sewage treatment works

Storm tanks and inlet overflows at each Anglian Water 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.