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
Leiston - Waterloo Avenue CSO Overflow on sewer network Company site name Leiston - Waterloo Avenue CSO EA ID / permit AWS00729 · EPRNB3695WR Outlet location TM4523063300 (OS grid reference) · View on Apple Maps WFD catchment Leiston Beck (GB105035046271) 2024 spills / hours 9 / 3.0 Long-term average 11.2 spills a year (monitored since 2020) Monitor below 90% Comms failure / issue · Resolved - Oct Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	Leiston Beck	7	1.8	down 22%	82%
St Osyths CSO Overflow on sewer network Company site name OUNDLE ST OSYTHS LANE CSO EA ID / permit AWS01262 · AWNNF13662 Outlet location TL0461088770 (OS grid reference) · View on Apple Maps WFD catchment Nene - Islip to tidal (GB105032050381) 2024 spills / hours 1 / 0.3 Long-term average 3.0 spills a year (monitored since 2024) Monitor below 90% Telemetry or data archiving failure / issue · Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	River Nene	5	1.8	up 400%	7%
Great Dunmow STW Storm discharge at pumping station Company site name GT DUNMOW STW EA ID / permit AWS00495 · ASENF15793 Outlet location TL6353021350 (OS grid reference) · View on Apple Maps WFD catchment Chelmer (Gt. Easton - R. Can) (GB105037033950) 2024 spills / hours 10 / 26 Long-term average 6.5 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 Volume & pollution Estimate from 1.8 hours spilling →	Trib River Chelmer	3	1.8	down 70%	100%
Desborough-Near Corset Factory CSO Overflow on sewer network Company site name Desborough-Near Corset Factory Combined Sewer Overflow EA ID / permit AWS00333 · AWNNF13851 Outlet location SP8049082650 (OS grid reference) · View on Apple Maps WFD catchment Ise - Upper (GB105032045200) 2024 spills / hours 25 / 30 Long-term average 22.8 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	Unnamed Tributary of River Ise	6	1.8	down 76%	92%
Stowmarket Central CSO Overflow on sewer network Company site name STOWMARKET-CENTRAL OV EA ID / permit AWS01319 · ASENF1682 Outlet location TM0518058610 (OS grid reference) · View on Apple Maps WFD catchment Gipping (through Stowmarket) (GB105035046130) 2024 spills / hours 17 / 40 Long-term average 15.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	River Gipping	3	1.8	down 82%	100%
Roxton(School Lane) Pumping Station Storm discharge at pumping station Company site name ROXTON STW EA ID / permit AWS01069 · AWCNF11935 Outlet location TL1551754586 (OS grid reference) · View on Apple Maps WFD catchment Ouse (Roxton to Earith) (GB105033047921) 2024 spills / hours 33 / 607 Long-term average 18.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	Ditch Trib of River Great Ouse	4	1.8	down 88%	100%
SO Ramsey Overflow on sewer network Company site name RAMSEY-WHYTEFIELD RD SSO EA ID / permit AWS01153 · AW1NF199 Outlet location TL2892086070 (OS grid reference) · View on Apple Maps WFD catchment Middle Level (GB205033000050) 2024 spills / hours 20 / 57 Long-term average 13.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	Bury Brook	6	1.8	down 70%	99%
Southend - Belton Gardens PS Overflow on sewer network Company site name SOUTHEND CANEWDON ROAD SP EA ID / permit AWS01168 · S/WR81 Outlet location TQ8694085160 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Southend Westcliff Bay 2024 spills / hours 0 / 0.0 Long-term average 2.0 spills a year (monitored since 2024) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	Thames Estuary	4	1.8	up from 0	100%
Northampton Bridge Street CSO Overflow on sewer network Company site name NORTHAMPTON-BRIDGE ST OV EA ID / permit AWS00909 · EPRJB3297NS Outlet location SP7590060060 (OS grid reference) · View on Apple Maps WFD catchment Nene - conf Brampton Branch to conf Ise (GB105032045050) 2024 spills / hours 11 / 12 Long-term average 18.6 spills a year (monitored since 2019) Monitor below 90% Power failure / issue · Resolved - Dec Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.7 hours spilling →	River Nene	5	1.7	down 55%	75%
Castle Ashby STW Inlet overflow at sewage works Sewage works Castle Ashby EA ID / permit AWS00204 · AWNNF13072 Outlet location SP8592059860 (OS grid reference) · View on Apple Maps WFD catchment Castle Ashby Arm (Grendon Brook) (GB105032045030) 2024 spills / hours 28 / 82 Long-term average 13.0 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.7 hours spilling →	unnamed tributary Castle Ashby	8	1.7	down 71%	100%
St Neots STW Storm tank at sewage works Sewage works St Neots EA ID / permit AWS01259 · AW1NF909 Outlet location TL1928062030 (OS grid reference) · View on Apple Maps WFD catchment Ouse (Roxton to Earith) (GB105033047921) 2024 spills / hours 8 / 26 Long-term average 5.3 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.6 hours spilling →	River Ouse	6	1.6	down 25%	100%
Queens Road/Esplanade CSO Overflow on sewer network Company site name Frinton-on-Sea Queens Road/Esplanade Combined Sewer Overflow EA ID / permit AWS01021 · ASECS3311/12194 Outlet location TM2407019710 (OS grid reference) · View on Apple Maps WFD catchment Essex (GB650503520001) Bathing water Frinton 2024 spills / hours 2 / 0.7 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 Volume & pollution Estimate from 1.6 hours spilling →	The North Sea	1	1.6	down 50%	100%
London Rd PS Wymondham Storm discharge at pumping station Company site name WYMONDHAM-LONDON RD SP EA ID / permit AWS00762 · AEENF12207 Outlet location TG1096001150 (OS grid reference) · View on Apple Maps WFD catchment Tiffey (u/s Wymondham STW) (GB105034051180) 2024 spills / hours 2 / 1.5 Long-term average 3.3 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	River Tiffey	1	1.5	down 50%	100%
Ely Willow Walk TPS Storm discharge at pumping station Company site name Ely Willow Walk Terminal Pumping Station EA ID / permit AWS00411 · AECNF11328 Outlet location TL5477079990 (OS grid reference) · View on Apple Maps WFD catchment Ely Ouse (South Level) (GB205033000070) 2024 spills / hours 1 / 1.9 Long-term average 1.6 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	River Great Ouse	1	1.5	no change	100%
Sports Centre Mill Rd. Overflow on sewer network Company site name COLCHESTER-IPSWICH RD OV EA ID / permit AWS01224 · AW2NFC299 Outlet location TM0060028888 (OS grid reference) · View on Apple Maps WFD catchment Salary Brook (GB105037041320) 2024 spills / hours 6 / 2.0 Long-term average 5.5 spills a year (monitored since 2024) Monitor below 90% Power failure / issue · Scheduled Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	Tendring Streams	5	1.5	down 17%	69%
North Walsham-Bluebell Road CSO Overflow on sewer network Company site name North Walsham-Bluebell Road Combined Sewer Overflow EA ID / permit AWS00904 · AEENF12104 Outlet location TG2936030880 (OS grid reference) · View on Apple Maps WFD catchment North Walsham and Dilham Canal (disused) (GB105034055710) 2024 spills / hours 5 / 2.8 Long-term average 4.7 spills a year (monitored since 2020) Monitor below 90% Power failure / issue · Resolved - May Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	tributary River Ant	2	1.5	down 60%	85%
Rothwell Interchange Overflow on sewer network Company site name ROTHWELL MEADOW RD SSO EA ID / permit AWS01065 · AWNNF10495A Outlet location SP8174080630 (OS grid reference) · View on Apple Maps WFD catchment Slade Brook (GB105032045170) 2024 spills / hours 20 / 25 Long-term average 12.0 spills a year (monitored since 2024) Monitor below 90% Installation set-up/design issue · Resolved - Jul Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	Slade Brook River Ise	4	1.5	down 80%	72%
Wentworth - College Farm PS Storm discharge at pumping station Company site name WENTWORTH-COLLEGE FARM SP EA ID / permit AWS01467 · AW1NF1000 Outlet location TL4751078590 (OS grid reference) · View on Apple Maps WFD catchment Old Bedford River / River Delph (inc The Hundred Foot Washes) (GB205033000060) 2024 spills / hours 0 / 0.0 Long-term average 0.4 spills a year (monitored since 2021) Monitor below 90% Power failure / issue · Resolved - Jul Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	Folly River	1	1.5	up from 0	74%
Leiston - Main Street #2 CSO Overflow on sewer network Company site name Leiston - Main Street #2 CSO EA ID / permit AWS00724 · EPRNB3694VV Outlet location TM4523063300 (OS grid reference) · View on Apple Maps WFD catchment Leiston Beck (GB105035046271) 2024 spills / hours 3 / 0.8 Long-term average 5.8 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	Leiston Beck	5	1.5	up 67%	95%
CSO and EO at Pirton TPS Storm discharge at pumping station Company site name PIRTON TPS EA ID / permit AWS00305 · AWCNF2531 Outlet location TL1441932342 (OS grid reference) · View on Apple Maps WFD catchment Stondon Brook (GB105033037710) 2024 spills / hours 11 / 20 Long-term average 12.7 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	Tributary of the River Hiz	2	1.5	down 82%	99%
Thorpe Road PS Storm discharge at pumping station Company site name WEELEY-THORPE RD SP EA ID / permit AWS01374 · AW2NFE08367 Outlet location TM1520022600 (OS grid reference) · View on Apple Maps WFD catchment Holland Brook (GB105037077810) 2024 spills / hours 16 / 10 Long-term average 10.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	Trib Holland Brook	4	1.5	down 75%	99%
Lincoln Outer Circle Road CSO Overflow on sewer network Company site name LINCOLN-OUTER CIRCLE RD SSO EA ID / permit AWS00736 · ANNNF10242 Outlet location SK9974072520 (OS grid reference) · View on Apple Maps WFD catchment Witham - conf Catchwater Drain to conf Bain (GB205030062425) 2024 spills / hours 2 / 1.5 Long-term average 4.0 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	Greetwell Beck	2	1.5	no change	96%
Southend - Belton Gardens PS Overflow on sewer network Company site name SOUTHEND-RETREAT ROAD CSO EA ID / permit AWS01169 · S/WR80 Outlet location TQ8701084990 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Southend Westcliff Bay 2024 spills / hours 1 / 0.5 Long-term average 2.5 spills a year (monitored since 2024) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.5 hours spilling →	Thames Estuary	4	1.5	up 300%	98%
Podington STW Storm tank at sewage works Sewage works Podington EA ID / permit AWS00999 · AWNNF854/13029 Outlet location SP9397062830 (OS grid reference) · View on Apple Maps WFD catchment Knuston Brook (GB105032045060) 2024 spills / hours 2 / 3.5 Long-term average 3.5 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.4 hours spilling →	Knuston Brook River Nene	5	1.4	up 150%	100%
St Neots - Market Square CSO Overflow on sewer network Company site name St. Neots - Market Square CSO EA ID / permit AWS01258 · AW1NF2577 Outlet location TL1812060170 (OS grid reference) · View on Apple Maps WFD catchment Ouse (Roxton to Earith) (GB105033047921) 2024 spills / hours 32 / 75 Long-term average 27.1 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.4 hours spilling →	River Great Ouse	14	1.4	down 56%	95%
School Lane / Bedford Street CSO Overflow on sewer network Company site name Norwich School Lane/Bedford Street Combined Sewer Overflow EA ID / permit AWS01106 · EPREB3296NR Outlet location TG2302808869 (OS grid reference) · View on Apple Maps WFD catchment Wensum DS Norwich (GB105034055882) 2024 spills / hours 3 / 0.8 Long-term average 1.8 spills a year (monitored since 2018) Monitor below 90% Telemetry or data archiving failure / issue · Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	The River Wensum	4	1.3	up 33%	39%
Leiston - Main Street #3 CSO Overflow on sewer network Company site name Leiston - Main Street #3 CSO EA ID / permit AWS00725 · EPRNB3695AY Outlet location TM4523063300 (OS grid reference) · View on Apple Maps WFD catchment Leiston Beck (GB105035046271) 2024 spills / hours 8 / 2.5 Long-term average 9.5 spills a year (monitored since 2020) Monitor below 90% Comms failure / issue · Resolved - Oct Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Leiston Beck	5	1.3	down 38%	83%
Stevington EO/SSO Overflow on sewer network Company site name Stevington Church Road SSO EA ID / permit AWS01294 · AW1NF891 Outlet location SP9920053450 (OS grid reference) · View on Apple Maps WFD catchment Ouse (Newport Pagnell to Roxton) (GB105033047923) 2024 spills / hours 75 / 1,299 Long-term average 38.0 spills a year (monitored since 2024) Monitor below 90% Power failure / issue · Resolved - Jul Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Stevington Brook	1	1.3	down 99%	49%
Tolleshunt D'Arcy STW Other storm discharge asset type (with treatment) Company site name Tolleshunt D'Arcy Sewage Treatment Works EA ID / permit AWS01393 · ASENF1317 Outlet location TL9220010500 (OS grid reference) · View on Apple Maps WFD catchment BLACKWATER (GB520503714000) Treatment Reed bed 2024 spills / hours 14 / 24 Long-term average 8.6 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Bowstead Brook River Blackwate	3	1.3	down 79%	93%
Wellingborough Hatton Park No.1 CSO Overflow on sewer network Company site name WELLINGBOROUGH-HATTON PARK SSO EA ID / permit AWS01461 · AWNNF13849 Outlet location SP8940067650 (OS grid reference) · View on Apple Maps WFD catchment Swanspool Brook (GB105032045070) 2024 spills / hours 9 / 17 Long-term average 11.6 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Swanspool Brook	4	1.3	down 56%	92%
Bossington Lane CSO Overflow on sewer network Company site name LEIGHTON BUZD-BOSSINGTON LN OV EA ID / permit AWS00097 · AWCNF11354 Outlet location SP9170025530 (OS grid reference) · View on Apple Maps WFD catchment Ouzel US Caldecote Mill (GB105033037971) 2024 spills / hours 8 / 7.0 Long-term average 4.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	River Ouzel	1	1.3	down 88%	100%
Irchester (8050) SSO Overflow on sewer network EA ID / permit AWS00649 · AW5NF2036 Outlet location SP9281066050 (OS grid reference) · View on Apple Maps WFD catchment Knuston Brook (GB105032045060) 2024 spills / hours 21 / 53 Long-term average 12.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Trib River Nene	3	1.3	down 86%	99%
Rotterdam Road #1 CSO Overflow on sewer network Company site name Rotterdam Road #1 Combined Sewer Overflow EA ID / permit AWS01066 · EPRLB3996NV Outlet location TM5388092820 (OS grid reference) · View on Apple Maps WFD catchment Waveney (Ellingham Mill - Burgh St. Peter) (GB105034045903) 2024 spills / hours 1 / 0.3 Long-term average 3.0 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Inner Harbour (Tidal)	4	1.3	up 300%	90%
Station Rd Kelvedon Overflow on sewer network Company site name KELVEDON-STATION RD SO EA ID / permit AWS01281 · AW2NFC183 Outlet location TL8633019360 (OS grid reference) · View on Apple Maps WFD catchment Blackwater (Combined Essex) (GB105037041160) 2024 spills / hours 11 / 4.0 Long-term average 7.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Blackwater (Combined Essex)	4	1.3	down 64%	100%
Stibbington STW SSO Overflow on sewer network Company site name STIBBINGTON STIBOV MH2101 FDT EA ID / permit AWS01576 · Permit Applied For Outlet location TL0921298117 (OS grid reference) · View on Apple Maps WFD catchment Nene - Islip to tidal (GB105032050381) 2024 spills / hours 0 / 0.0 Long-term average 2.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Nene - Islip to tidal	2	1.3	up from 0	92%
Southend - Belton Gardens PS Storm discharge at pumping station Company site name Southend-Belton Gardens Pumping Station EA ID / permit AWS01161 · S/WR73 Outlet location TQ8347085420 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Leigh Bell Wharf 2024 spills / hours 2 / 7.0 Long-term average 3.0 spills a year (monitored since 2020) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Thames Estuary	1	1.3	down 50%	100%
Coggeshall Water Recycling Centre Storm tank at sewage works Sewage works Coggeshall Company site name COGGESHALL STW EA ID / permit AWS00252 · AW2NF151 Outlet location TL8596021370 (OS grid reference) · View on Apple Maps WFD catchment Blackwater (Combined Essex) (GB105037041160) 2024 spills / hours 6 / 8.8 Long-term average 2.8 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.2 hours spilling →	The River Blackwater Nt	2	1.2	down 67%	100%
Great Sampford STW Storm tank at sewage works Sewage works Great Sampford EA ID / permit AWS00506 · ASENF1084 Outlet location TL6316036250 (OS grid reference) · View on Apple Maps WFD catchment Pant (GB105037041180) 2024 spills / hours 2 / 0.2 Long-term average 2.0 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.2 hours spilling →	Tributary River Pant Nt	3	1.2	up 50%	99%
Peterborough River Lane CSO Overflow on sewer network Company site name Peterborough River Lane CSO EA ID / permit AWS00987 · AW5NF1794 Outlet location TL1883098210 (OS grid reference) · View on Apple Maps WFD catchment Nene - Islip to tidal (GB105032050381) 2024 spills / hours 21 / 13 Long-term average 25.9 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.2 hours spilling →	The River Nene	6	1.2	down 71%	100%
Northmarston Water Recylcing Centre Storm tank at sewage works Sewage works Northmarston Water Recylcing Centre Company site name NORTH MARSTON STW EA ID / permit AWS00921 · AW1NF/1459 Outlet location SP7680023070 (OS grid reference) · View on Apple Maps WFD catchment Claydon Brook Tributary (GB105033030550) 2024 spills / hours 5 / 2.0 Long-term average 19.0 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.2 hours spilling →	Tributary Claydon Brook Nt	4	1.2	down 20%	100%
Mistley School Lane MH9602 Lm Overflow on sewer network Company site name Mistley, School Lane CSO EA ID / permit AWS01578 · Permit Applied For Outlet location TM1178531868 (OS grid reference) · View on Apple Maps WFD catchment STOUR (ESSEX) (GB520503613602) 2024 spills / hours 19 / 370 Long-term average 7.0 spills a year (monitored since 2024) Monitor below 90% Comms failure / issue · Resolved - Dec Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.1 hours spilling →	River Stour	7	1.1	down 63%	78%
Martlesham Bridge Pumping Station Storm discharge at pumping station Company site name MARTLESHAM M BRIDGE SP EA ID / permit AWS00825 · ASENF2160 Outlet location TM2530047300 (OS grid reference) · View on Apple Maps WFD catchment Lark - Fynn (d/s confluence) (GB105035040300) Shellfish water Deben 2024 spills / hours 0 / 0.0 Long-term average 1.3 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 1.1 hours spilling →	The River Fynn	6	1.1	up from 0	100%
Norwich St Faiths Lane CSO Overflow on sewer network Company site name Norwich St.Faiths Lane Combined Sewer Overflow EA ID / permit AWS00945 · EPRGB3293VQ Outlet location TG2386008590 (OS grid reference) · View on Apple Maps WFD catchment Wensum DS Norwich (GB105034055882) 2024 spills / hours 26 / 6.3 Long-term average 33.8 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.1 hours spilling →	The River Wensum	6	1.1	down 77%	100%
Southend - Belton Gardens PS Overflow on sewer network Company site name Southend Burdett Road Combined Sewer Overflow EA ID / permit AWS01178 · S/WR86 Outlet location TQ8919084880 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Southend Jubilee Shellfish water Foulness 2024 spills / hours 4 / 0.7 Long-term average 5.7 spills a year (monitored since 2019) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.1 hours spilling →	The Thames Estuary	7	1.1	up 75%	100%
Felsted(Lr Chelmer) STW Storm tank at sewage works Sewage works Felsted Company site name Felsted Sewage Treatment Works EA ID / permit AWS00428 · AW2NF911 Outlet location TL6681020660 (OS grid reference) · View on Apple Maps WFD catchment Stebbing Brook (GB105037041190) 2024 spills / hours 0 / 0.0 Long-term average 8.8 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.0 hours spilling →	Stebbing Brook River Chelmer N	1	1.0	up from 0	100%
Apethorpe SPS Storm discharge at pumping station Company site name APETHORPE SP EA ID / permit AWS00020 · AW5NF5348 Outlet location TL0278095370 (OS grid reference) · View on Apple Maps WFD catchment Willow Brook (Nene) (GB105032050290) 2024 spills / hours 29 / 498 Long-term average 14.3 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.0 hours spilling →	Willow Brook	2	1.0	down 93%	100%
Sampson Road SPS Storm discharge at pumping station Company site name BRIGHTLINGSEA-SAMPSONS RD SP EA ID / permit AWS01090 · AW2NFE02584 Outlet location TM0830018200 (OS grid reference) · View on Apple Maps WFD catchment Colne Essex (GB520503713800) Shellfish water Colne 2024 spills / hours 1 / 1.3 Long-term average 3.0 spills a year (monitored since 2023) Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.0 hours spilling →	Unnamed trib Brightlingsea Bro	2	1.0	up 100%	100%
Lt Harrowden SSO (6503) Overflow on sewer network Company site name LITTLE HARROWDEN SSO EA ID / permit AWS00790 · AW5NF2032 Outlet location SP8667071530 (OS grid reference) · View on Apple Maps WFD catchment Hardwick Brook (GB105032045100) 2024 spills / hours 109 / 834 Long-term average 56.0 spills a year (monitored since 2024) Monitor below 90% Power failure / issue · Resolved - Sep Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.0 hours spilling →	Trib River Nene	3	1.0	down 97%	89%
Norwich - Barrack Street CSO Overflow on sewer network Company site name NORWICH-BARRACK STREET SSO EA ID / permit AWS00924 · EPRMB3699EK Outlet location TG2342009170 (OS grid reference) · View on Apple Maps WFD catchment Wensum DS Norwich (GB105034055882) 2024 spills / hours 3 / 0.8 Long-term average 4.7 spills a year (monitored since 2020) Monitor below 90% Comms failure / issue · Scheduled Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.0 hours spilling →	River Wensum	3	1.0	no change	90%
Hunstanton South End Road TPS Storm discharge at pumping station Company site name Hunstanton South End Road Terminal Pumping Station EA ID / permit AWS00630 · AECCS10416 Outlet location TF6600040160 (OS grid reference) · View on Apple Maps WFD catchment Wash Outer (GB640523160000) 2024 spills / hours 3 / 2.5 Long-term average 14.3 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 1.0 hours spilling →	The Wash	2	1.0	down 33%	100%

Sewage treatment works

Storm tanks and inlet overflows at each Anglian Water sewage works. The figures are 2025 spills.

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