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
Bancroft Recreation Ground CSO Overflow on sewer network Company site name HITCHIN-BANCROFT REC SSO EA ID / permit AWS00047 · AW1NF1886 Outlet location TL1871029560 (OS grid reference) · View on Apple Maps WFD catchment Hiz (through Hitchin) (GB105033037680) 2024 spills / hours 2 / 3.0 Long-term average 0.8 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	River Hiz	0	0.0	down 100%	100%
Biggleswade Dark Lane CSO Overflow on sewer network Company site name Biggleswade Dark Lane Combined Sewer Overflow EA ID / permit AWS00086 · AWCNF11839 Outlet location TL1861044840 (OS grid reference) · View on Apple Maps WFD catchment Ivel (DS Langford to Roxton) (GB105033038170) 2024 spills / hours 0 / 0.0 Long-term average 6.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	The River Ivel	0	0.0	no change	100%
Brackley Bridge Street CSO Overflow on sewer network Company site name BRACKLEY-BRIDGE ST SSO EA ID / permit AWS00111 · AW1NF1017 Outlet location SP5843036410 (OS grid reference) · View on Apple Maps WFD catchment Hinton Stream (GB105033037950) 2024 spills / hours 1 / 0.3 Long-term average 2.8 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Hinton Stream	0	0.0	down 100%	99%
Bracondale Combined Sewer Overflow Overflow on sewer network Company site name NORWICH, BRACONDALE CSO EA ID / permit AWS00114 · EPRHB3693DN Outlet location TG2443006980 (OS grid reference) · View on Apple Maps WFD catchment Yare (Tiffey to Wensum) (GB105034051281) 2024 spills / hours 0 / 0.0 Long-term average 10.5 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	The River Yare	0	0.0	no change	99%
Broughton-Townhill CSO Overflow on sewer network Company site name BROUGHTON-TOWNHILL(MH4103) EA ID / permit AWS00163 · ANNNF13537 Outlet location SE9657009210 (OS grid reference) · View on Apple Maps WFD catchment Ancholme from Bishopbridge to the Humber (GB104029067520) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	The Moor Beck	0	0.0	no change	100%
Castlethorpe SO Overflow on sewer network Company site name CASTLETHORPE-CHEQUERS FARM SSO EA ID / permit AWS00208 · AW1NF86 Outlet location SP7982144098 (OS grid reference) · View on Apple Maps WFD catchment Tove (DS Greens Norton) (GB105033038180) 2024 spills / hours 1 / 0.8 Long-term average 0.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Unknown Trib	0	0.0	down 100%	100%
Chester Road CSO Overflow on sewer network Company site name WELLINGBOROUGH-CHESTER ROAD EA ID / permit AWS00225 · AW5NF1805 Outlet location SP9015067660 (OS grid reference) · View on Apple Maps WFD catchment Swanspool Brook (GB105032045070) 2024 spills / hours 3 / 1.0 Long-term average 5.0 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Swanspool Brook	0	0.0	down 100%	93%
Coggeshall East Street Ro 18 CSO Overflow on sewer network Company site name COGGESHALL-EAST ST R O #18 OV EA ID / permit AWS00251 · AW2NFE02579 Outlet location TL8513022480 (OS grid reference) · View on Apple Maps WFD catchment Blackwater (Combined Essex) (GB105037041160) 2024 spills / hours 1 / 3.5 Long-term average 0.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Trib River Blackwater	0	0.0	down 100%	100%
Cosgrove 23 Main Street CSO Overflow on sewer network Company site name Cosgrove 23 Main Street Combined Sewer Overflow EA ID / permit AWS00281 · EPRRB3295WE Outlet location SP7985042670 (OS grid reference) · View on Apple Maps WFD catchment Tove (DS Greens Norton) (GB105033038180) 2024 spills / hours 12 / 33 Long-term average 5.0 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	River Tove	0	0.0	down 100%	100%
Dennis Sneezum Court CSO Overflow on sewer network Company site name DOWNHAM MARKET-DENIS SNZM SSO EA ID / permit AWS00326 · AECNF10445 Outlet location TF6088002960 (OS grid reference) · View on Apple Maps WFD catchment Relief Channel (GB205033047665) 2024 spills / hours 5 / 2.5 Long-term average 4.8 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	unnamed tributary Relief Chann	0	0.0	down 100%	100%
Hartwell Colmar Kennels CSO Overflow on sewer network Company site name HARTWELL-COLMAR KENNELS SSO EA ID / permit AWS00565 · AWCNF/3934/11676 Outlet location SP7769050600 (OS grid reference) · View on Apple Maps WFD catchment Tove (DS Greens Norton) (GB105033038180) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Trib of River Tove	0	0.0	no change	100%
Hawkwell - Rectory Road CSO Overflow on sewer network Company site name HAWKWELL-RECTORY RD HAWKWELL EA ID / permit AWS00575 · AW2NFE10166 Outlet location TQ8578091850 (OS grid reference) · View on Apple Maps WFD catchment Roach (GB105037028742) 2024 spills / hours 0 / 0.0 Long-term average 0.6 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Hawkwell Brook	0	0.0	no change	98%
Irchester SWS Overflow on sewer network Company site name Irchester Station Road SSO EA ID / permit AWS00651 · AW5NF512 Outlet location SP9358066150 (OS grid reference) · View on Apple Maps WFD catchment Knuston Brook (GB105032045060) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Trib River Nene & Knutsford Bk	0	0.0	no change	99%
Irthlingborough Road Overflow on sewer network Company site name WELLINGBOROUGH -IRTHLINGBOROUGH RD CSO#2 EA ID / permit AWS00657 · AWNNF13850 Outlet location SP9066067330 (OS grid reference) · View on Apple Maps WFD catchment Ise - Lower (GB105032045140) 2024 spills / hours 2 / 1.5 Long-term average 1.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	The River Ise	0	0.0	down 100%	92%
Kibworth Harborough Road CSO Overflow on sewer network Company site name Kibworth Harborough Road CSO EA ID / permit AWS00674 · AWNNF13411 Outlet location SP6871094040 (OS grid reference) · View on Apple Maps WFD catchment Langton Brook (GB105031045620) 2024 spills / hours 2 / 0.5 Long-term average 1.0 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Tributary of Langton Brook	0	0.0	down 100%	100%
Louth-Kenwick CSO Overflow on sewer network Company site name LOUTH-KENWICK ROAD SSO EA ID / permit AWS00778 · ANNNF1763 Outlet location TF3381086420 (OS grid reference) · View on Apple Maps WFD catchment South Dike and Grayfleet Drain (GB105029061680) 2024 spills / hours 0 / 0.0 Long-term average 2.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Stewton Beck	0	0.0	no change	100%
Lusher Rise Stormwater Sewer Overflow on sewer network Company site name WENSUM VALLEY-LUSHER RISE SSO EA ID / permit AWS00793 · AW4NF519XM Outlet location TG2330009000 (OS grid reference) · View on Apple Maps WFD catchment Wensum DS Norwich (GB105034055882) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Wensum Ds Norwich	0	0.0	no change	98%
Lynn Road CSO Overflow on sewer network Company site name DOWNHAM MKT-LYNN ROAD OV EA ID / permit AWS00795 · AECNF/260/10446 Outlet location TF6067003930 (OS grid reference) · View on Apple Maps WFD catchment Relief Channel (GB205033047665) 2024 spills / hours 1 / 0.3 Long-term average 1.7 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	unnamed tributary of Relief Ch	0	0.0	down 100%	97%
Meadowbrook Road SSO Overflow on sewer network Company site name KIBWORTH-MEADOWSBROOK RD SSO EA ID / permit AWS00829 · AW5NF1870 Outlet location SP6700093800 (OS grid reference) · View on Apple Maps WFD catchment Sence from Burton Brook to Countesthorpe Brook (GB104028046620) 2024 spills / hours 2 / 0.5 Long-term average 1.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Langton Brook	0	0.0	down 100%	100%
Norwich - New Mills CSO Overflow on sewer network Company site name NORWICH-NEW MILLS SSO EA ID / permit AWS00929 · EPRMB3699AM Outlet location TG2259009020 (OS grid reference) · View on Apple Maps WFD catchment Wensum DS Norwich (GB105034055882) 2024 spills / hours 0 / 0.0 Long-term average 0.7 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	River Wensum	0	0.0	no change	99%
Norwich Oak Lane CSO Overflow on sewer network Company site name NORWICH - OAK LANE EA ID / permit AWS00940 · EPREB3099AK Outlet location TG2253309507 (OS grid reference) · View on Apple Maps WFD catchment Wensum DS Norwich (GB105034055882) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	The River Wensum	0	0.0	no change	92%
Norwich Road CSO'S (#1 & #2) Overflow on sewer network Company site name LOWESTOFT-NORWICH RD SO EA ID / permit AWS00943 · ASETS16992 Outlet location TM5378092850 (OS grid reference) · View on Apple Maps WFD catchment Waveney (Ellingham Mill - Burgh St. Peter) (GB105034045903) 2024 spills / hours 0 / 0.0 Long-term average 2.6 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Inner Harbour	0	0.0	no change	100%
Peteborough North Minster CSO Overflow on sewer network Company site name Peterborough North Minster Combined Sewer Overflow EA ID / permit AWS00981 · AW5NF620 Outlet location TL1969098020 (OS grid reference) · View on Apple Maps WFD catchment Nene - Islip to tidal (GB105032050381) 2024 spills / hours 3 / 3.7 Long-term average 2.6 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	The River Nene	0	0.0	down 100%	100%
Peterborough - Ullswater Ave CSO Overflow on sewer network Company site name Peterborough - Ullswater Avenue Combined Sewer Overflow EA ID / permit AWS00984 · AW5NF1795 Outlet location TF1780002920 (OS grid reference) · View on Apple Maps WFD catchment Folly River (including Werrington and Marholm Brooks) (GB105031050560) 2024 spills / hours 5 / 13 Long-term average 2.4 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Werrington Brook	0	0.0	down 100%	99%
Rutland Terrace CSO Overflow on sewer network Company site name Stamford - Rutland Terrace Combined Sewer Overflow EA ID / permit AWS01082 · NPSWQD005875 Outlet location TF0258006860 (OS grid reference) · View on Apple Maps WFD catchment Welland - conf Langton Bk to conf Gwash (GB105031050580) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Mill Stream	0	0.0	no change	100%
Salcey Forest SO Overflow on sewer network Company site name HARTWELL-SALCEY FOREST SSO EA ID / permit AWS01089 · AWCNF10021 Outlet location SP7878050930 (OS grid reference) · View on Apple Maps WFD catchment Tove (DS Greens Norton) (GB105033038180) 2024 spills / hours 1 / 0.3 Long-term average 0.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Salcey Brook	0	0.0	down 100%	99%
Sewer at Harwich Road Overflow on sewer network Company site name THORPE LE SOKEN-RICE BR OV EA ID / permit AWS01113 · AW2NFE01682 Outlet location TM1795021170 (OS grid reference) · View on Apple Maps WFD catchment Holland Brook (GB105037077810) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Holland Brook	0	0.0	no change	99%
SSO St Andrews Church Overflow on sewer network Company site name WEST DEEPING - MH951 SSO EA ID / permit AWS01248 · AW5NF1809 Outlet location TF1091008590 (OS grid reference) · View on Apple Maps WFD catchment Welland - conf Gwash to conf Greatford Cut (GB105031050600) 2024 spills / hours 1 / 4.0 Long-term average 0.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	River Welland	0	0.0	down 100%	100%
Thaxted Road/Victoria Ave CSO Overflow on sewer network Company site name SAFFRON WALDEN-VICTORIA THX OV EA ID / permit AWS01355 · EPRNB3691VH Outlet location TL5449038150 (OS grid reference) · View on Apple Maps WFD catchment Slade (GB105033037580) 2024 spills / hours 7 / 3.0 Long-term average 2.2 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	The Slade	0	0.0	down 100%	100%
Trimingham Overflow on sewer network Company site name TRIMINGHAM-RESERVOIR OV EA ID / permit AWS01403 · AW4NF881X Outlet location TG2680038900 (OS grid reference) · View on Apple Maps WFD catchment Mun (GB105034055900) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	River Mun	0	0.0	no change	100%
Victoria Road CSO Overflow on sewer network Company site name DISS - VICTORIA ROAD CSO (MORRISONS) EA ID / permit AWS01423 · AEENF20069 Outlet location TM1170079420 (OS grid reference) · View on Apple Maps WFD catchment Waveney (u/s Frenze Beck) (GB105034045820) 2024 spills / hours 1 / 0.3 Long-term average 0.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	River Waveney	0	0.0	down 100%	100%
Clacton Collingwood Rd/Wash Ln CSO Overflow on sewer network Company site name Clacton Collingwood Road / Wash Lane Combined Sewer Overflow EA ID / permit AWS00236 · ASECS12233 Outlet location TM1710013910 (OS grid reference) · View on Apple Maps WFD catchment Essex (GB650503520001) Bathing water Clacton Beach Martello Tower 2024 spills / hours 2 / 0.3 Long-term average 2.0 spills a year (monitored since 2019) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period	The North Sea	0	0.0	down 100%	100%
Clacton Sea Front / Gunfleet CSO Overflow on sewer network Company site name Clacton Sea Front / Gunfleet CSO EA ID / permit AWS00239 · ASECS12230 Outlet location TM1943015510 (OS grid reference) · View on Apple Maps WFD catchment Essex (GB650503520001) Bathing water Clacton 2024 spills / hours 2 / 15 Long-term average 12.3 spills a year (monitored since 2019) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period	The North Sea	0	0.0	down 100%	100%
Clarendon / Holland Road CSO Overflow on sewer network Company site name Clarendon/Holland Road Combined Sewer Overflow EA ID / permit AWS00242 · ASECS33328/12234 Outlet location TM1951015350 (OS grid reference) · View on Apple Maps WFD catchment Essex (GB650503520001) Bathing water Clacton 2024 spills / hours 0 / 0.0 Long-term average 4.9 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period	N.Sea via Gunfleet Long Sea Ou	0	0.0	no change	100%
Jaywick Brooklands Gardens PS Storm discharge at pumping station Company site name Jaywick Brooklands Gardens Pumping Station EA ID / permit AWS00662 · ASENF3334/12238 Outlet location TM1417013120 (OS grid reference) · View on Apple Maps WFD catchment Essex (GB650503520001) Bathing water Jaywick 2024 spills / hours 3 / 0.1 Long-term average 2.3 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period	Trib the North Sea	0	0.0	down 100%	100%
Southend - Belton Gardens PS Storm discharge at pumping station Company site name SOUTHEND-SHOEBURY RAMPARTST SP EA ID / permit AWS01187 · S/WR91 Outlet location TQ9420084650 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Shoebury East 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2024) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period	Thames Estuary	0	0.0	no change	100%
Southend Prittle Brook Storage Tank Overflow on sewer network Company site name SOUTHEND-CHALKWELL/RIDGEWAY OV EA ID / permit AWS01191 · S/WR480 Outlet location TQ8535085460 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Southend Chalkwell; Leigh Bell Wharf; Southend Westcliff Bay 2024 spills / hours 7 / 16 Long-term average 3.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period	Thames Estuary	0	0.0	down 100%	100%
Southend Prittle Brook Storage Tank Overflow on sewer network Company site name SOUTHEND-CHALKWELL/RIDGEWAY OV EA ID / permit AWS01192 · S/WR480 Outlet location TQ8535085460 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Southend Chalkwell; Leigh Bell Wharf; Southend Westcliff Bay 2024 spills / hours 1 / 0.5 Long-term average 0.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period	Thames Estuary	0	0.0	down 100%	100%
Southgate Ca. Ingoldmells Storm discharge at pumping station Company site name INGOLDMELLS-SOUTH GATE CAMP EA ID / permit AWS01198 · ANNNF2604 Outlet location TF5700068400 (OS grid reference) · View on Apple Maps WFD catchment Ingoldmells Main Drain (GB105029061700) Bathing water Ingoldmells South 2024 spills / hours 1 / 6.1 Long-term average 1.8 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period	Trib to Ingoldmells Main Drain	0	0.0	down 100%	100%
Sudbury - Cornard Road PS Storm discharge at pumping station Company site name SUDBURY-CORNARD RD SP EA ID / permit AWS01330 · ASENF3456/12336 Outlet location TL8801040920 (OS grid reference) · View on Apple Maps WFD catchment Stour (Wixoe - Lamarsh) (GB105036040941) Bathing water Friars Meadow, River Stour 2024 spills / hours 5 / 3.3 Long-term average 6.4 spills a year (monitored since 2021) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period	Tributary of River Stour	0	0.0	down 100%	100%
Chalkwell Esplanade Outfall Overflow on sewer network Company site name SOUTHEND-CHALKWELL/RIDGEWAY OV EA ID / permit AWS00212 · S/WR480 Outlet location TQ8575085280 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Southend Chalkwell 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2024) Monitor below 90% Telemetry or data archiving failure / issue · Not Applicable - Ongoing investigation Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period	Thames Estuary	–	–		0%
Southend - Belton Gardens PS Overflow on sewer network Company site name SOUTHEND-QUEENSWAY CSO EA ID / permit AWS01175 · S/WR84 Outlet location TQ8880084990 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Southend Jubilee; Southend Three Shells 2024 spills / hours 4 / 1.5 Long-term average 2.0 spills a year (monitored since 2024) Monitor below 90% Comms failure / issue · Resolved - Mar Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period	Thames Estuary	0	0.0	down 100%	70%

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.