Storm overflow register · 2025 annual return

Southern Water storm overflows, 2025

Southern Water reported 977 storm overflows in England for 2025. Together they recorded 15,554 spills over 114,868 hours, an average of 15.9 spills per overflow against 20.4 across England. That ranks 4 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 47% on 2024.

175 overflows did not spill · 42 spilled more than 60 times · 862 had monitors working for 90% of the year or more · 215 sewage treatment works with overflows

Hours spilling by month, 2025

010k20k30k40kJan 2025: 38,729 hours spillingJanFeb 2025: 17,875 hours spillingFebMar 2025: 4,010 hours spillingMarApr 2025: 1,990 hours spillingAprMay 2025: 746 hours spillingMayJun 2025: 804 hours spillingJunJul 2025: 2,044 hours spillingJulAug 2025: 883 hours spillingAugSep 2025: 4,161 hours spillingSepOct 2025: 8,831 hours spillingOctNov 2025: 6,321 hours spillingNovDec 2025: 28,488 hours spillingDec
Hours spilling, all Southern Water overflows, from the start/stop records. Spills running across a month end are split between the months.

All Southern Water storm overflows

Sorted by hours spilling. Open an overflow for its permit, location, reasons for high spills and improvement status.

OverflowDischarges toSpills 2025Hours 2025Spills vs 2024Monitor uptime
Eastbourne WwTW
Inlet overflow at sewage works
Sewage works
Eastbourne
Company site name
EASTBOURNE FORMULA A CEO - 115458
EA ID / permit
SWS00274 · A01106
Outlet location
TQ6430000900 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Eastbourne; Pevensey Bay
2024 spills / hours
0 / 0.0
Long-term average
1.0 spills a year (monitored since 2016)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - May
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The English Channel 0 0.0 no change 70%
Eight Acres Romsey CSO
Overflow on sewer network
Company site name
EIGHT ACRES ROMSEY CSO - 110234
EA ID / permit
SWS00285 · A01296
Outlet location
SU3651021360 (OS grid reference) · View on Apple Maps
WFD catchment
Tadburn Lake (GB107042016490)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Monitor below 90%
Comms failure / issue · Scheduled
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tadburn Lake 0 0.0 no change 49%
Enfield Road Leigh Wps
Storm discharge at pumping station
Company site name
ENSFIELD ROAD LEIGH CEO - 108669
EA ID / permit
SWS00290 · A00251
Outlet location
TQ5504045520 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Eden Confluence to Yalding (GB106040018182)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Medway 0 0.0 no change 100%
Fishermans Cottage CSO
Overflow on sewer network
Company site name
SHANKLIN CHINE CSO - 108046
EA ID / permit
SWS00313 · A01110
Outlet location
SZ5855081050 (OS grid reference) · View on Apple Maps
WFD catchment
Isle of Wight East (GB650705530000)
Bathing water
Sandown; Shanklin
2024 spills / hours
0 / 0.0
Long-term average
1.6 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
English Channel 0 0.0 no change 100%
Fishery Lane PS
Storm discharge at pumping station
Company site name
FISHERY LANE HAYLING ISLAND NO 2 CEO - 108429
EA ID / permit
SWS00314 · A00355
Outlet location
SZ7373098710 (OS grid reference) · View on Apple Maps
WFD catchment
CHICHESTER HARBOUR (GB580705210000)
Bathing water
Beachlands Central; Beachlands West; Eastoke; West Wittering
Shellfish water
Chichester Harbour (Emsworth Channel); Chichester Harbour (Thornham Channel); Langstone Harbour
2024 spills / hours
0 / 0.0
Long-term average
0.6 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Chichester Harbour 0 0.0 no change 100%
Flowers Brook Transfer PS
Storm discharge at pumping station
Company site name
FLOWERS BROOK VENTNOR CEO - 108894
EA ID / permit
SWS00320 · A00701
Outlet location
SZ5522076970 (OS grid reference) · View on Apple Maps
WFD catchment
Isle of Wight East (GB650705530000)
Bathing water
Ventnor
2024 spills / hours
0 / 0.0
Long-term average
0.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
English Channel 0 0.0 no change 100%
Fort Road Wastewater PS
Storm discharge at pumping station
Company site name
FORT ROAD NEWHAVEN WEST SSO - 115953
EA ID / permit
SWS00326 · A01174
Outlet location
TQ4502000310 (OS grid reference) · View on Apple Maps
WFD catchment
OUSE (GB540704104900)
Bathing water
Seaford
2024 spills / hours
2 / 7.4
Long-term average
0.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Ouse (Estuary) 0 0.0 down 100% 100%
Fullerton Wastewater Treatment Work
Storm tank at sewage works
Sewage works
Fullerton Wastewater Treatment Work
Company site name
FULLERTON SSO - 115765
EA ID / permit
SWS00338 · A00804
Outlet location
SU3816039170 (OS grid reference) · View on Apple Maps
WFD catchment
R. Test (GB107042022750)
2024 spills / hours
74 / 1,314
Long-term average
12.1 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
The River Test 0 0.0 down 100% 100%
Glenfield Avenue CSO
Overflow on sewer network
Company site name
GLENFIELD AVENUE SOUTHAMPTON CSO - 108435
EA ID / permit
SWS00350 · A00981
Outlet location
SU4485013650 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (GB107042022580)
Shellfish water
Southampton Water
2024 spills / hours
1 / 0.1
Long-term average
0.7 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Midden 0 0.0 down 100% 72%
Glynde South Ceo
Storm discharge at pumping station
Company site name
GLYNDE SOUTH CEO - 108239
EA ID / permit
SWS00353 · A01015
Outlet location
TQ4564008590 (OS grid reference) · View on Apple Maps
WFD catchment
Glynde Reach (GB107041012510)
2024 spills / hours
12 / 101
Long-term average
6.7 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Glynde Reach Trib River Ouse 0 0.0 down 100% 100%
Godinton Road Ashford CSO
Overflow on sewer network
Company site name
GODINTON ROAD ASHFORD CSO - 108639
EA ID / permit
SWS00355 · A00903
Outlet location
TR0025042730 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Great Stour (GB107040019660)
2024 spills / hours
2 / 2.0
Long-term average
0.3 spills a year (monitored since 2019)
Monitor below 90%
Comms failure / issue · Resolved - Jul
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Trib of the Great Stour 0 0.0 down 100% 70%
Gordon Square SPS
Overflow on sewer network
Company site name
CYPRUS ROAD FAVERSHAM SWP - 107439
EA ID / permit
SWS00358 · A00840
Outlet location
TR0210961594 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central; Swale East
2024 spills / hours
0 / 0.0
Long-term average
0.6 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Cooksditch Stream 0 0.0 no change 100%
Granville Road Eastbourne CSO
Overflow on sewer network
Company site name
GRANVILLE ROAD EASTBOURNE CSO - 108241
EA ID / permit
SWS00361 · A01257
Outlet location
TV6140098170 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Eastbourne
2024 spills / hours
2 / 0.7
Long-term average
0.6 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Surface to English Channel 0 0.0 down 100% 100%
Gravesend WwTW
Other storm discharge asset type
Company site name
GRAVESEND NO.2 SSO - 115455
EA ID / permit
SWS00363 · CATM.2969
Outlet location
TQ6693074340 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
0 / 0.0
Long-term average
1.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tidal River Thames 0 0.0 no change 100%
Green Lane Hayling Island CSO
Overflow on sewer network
Company site name
GREEN LANE HAYLING ISLAND CSO - 108769
EA ID / permit
SWS00368 · A01274
Outlet location
SZ7135098960 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Beachlands Central; Beachlands West; Eastoke
Shellfish water
Chichester Harbour (Emsworth Channel); Langstone Harbour
2024 spills / hours
1 / 3.8
Long-term average
1.2 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Hayling Bay 0 0.0 down 100% 84%
Grosvenor Recreation Ground
Overflow on sewer network
Company site name
GROSVENOR REC GROUND TUNBRIDGE WELLS CSO - 108644
EA ID / permit
SWS00371 · A00459
Outlet location
TQ5920040800 (OS grid reference) · View on Apple Maps
WFD catchment
Somerhill Stream (GB106040018410)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Somerhill Stream 0 0.0 no change 41%
Grove Road Strood CSO
Overflow on sewer network
Company site name
GROVE ROAD STROOD CSO - 108645
EA ID / permit
SWS00375 · K02115
Outlet location
TQ7420069310 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
1 / 0.1
Long-term average
2.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medway Estuary 0 0.0 down 100% 92%
Gruneison Road Storm PS
Overflow on sewer network
Company site name
WINSTANLEY ROAD PORTSMOUTH CSO - 108504
EA ID / permit
SWS00379 · W00279
Outlet location
SU6407002560 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Portsmouth Harbour; Spithead and Stokes Bay
2024 spills / hours
2 / 0.7
Long-term average
1.1 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Portsmouth Harbour 0 0.0 down 100% 85%
Hardway Ceo, Priory Road, Gosport
Storm discharge at pumping station
Company site name
HARDWAY CEO - 108830
EA ID / permit
SWS00398 · A01366
Outlet location
SU6133001620 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Central Solent; Cowes and Medina; Portsmouth Harbour; Ryde; Spithead and Stokes Bay
2024 spills / hours
2 / 2.1
Long-term average
1.0 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Portsmouth Harbour 0 0.0 down 100% 100%
Hartley Road Cranbrook CSO
Overflow on sewer network
Company site name
HARTLEY ROAD CRANBROOK CSO - 111152
EA ID / permit
SWS00405 · A01469
Outlet location
TQ7618034980 (OS grid reference) · View on Apple Maps
WFD catchment
Hammer Stream (GB106040018290)
2024 spills / hours
0 / 0.0
Long-term average
0.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Unnamed Trib of Hammer Stream 0 0.0 no change 99%
Hazebrouck Road Faversham Wwps
Storm discharge at pumping station
Company site name
HAZEBROUCK ROAD FAVERSHAM CEO - 108683
EA ID / permit
SWS00411 · A01409
Outlet location
TR0041061380 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central; Swale East
2024 spills / hours
0 / 0.0
Long-term average
0.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Faversham Creek (via Drain) 0 0.0 no change 100%
High Street Polegate
Overflow on sewer network
Company site name
HIGH STREET POLEGATE CSO - 108249
EA ID / permit
SWS00427 · D01056
Outlet location
TQ5817004760 (OS grid reference) · View on Apple Maps
WFD catchment
Langley Sewer at Eastbourne (GB107041006650)
2024 spills / hours
1 / 0.1
Long-term average
0.3 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Freshwater River 0 0.0 down 100% 40%
High Street Rainham CSO
Overflow on sewer network
Company site name
HIGH STREET RAINHAM CSO - 108652
EA ID / permit
SWS00429 · A01460
Outlet location
TQ8270067420 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
0 / 0.0
Long-term average
0.8 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Medway 0 0.0 no change 76%
High Street Rochester CSO
Overflow on sewer network
Company site name
HIGH STREET ROCHESTER CSO - 108877
EA ID / permit
SWS00430 · A00992
Outlet location
TQ7469068440 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
7 / 11
Long-term average
4.4 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medway Estuary 0 0.0 down 100% 14%
High Street/Briton Street CSO
Overflow on sewer network
Company site name
HIGH STREET SOUTHAMPTON CSO - 108440
EA ID / permit
SWS00432 · A00371
Outlet location
SU4207010840 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
0 / 0.0
Long-term average
0.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Test Estuary 0 0.0 no change 100%
Hill House Rye Ceo
Storm discharge at pumping station
Company site name
HILL HOUSE RYE CEO - 108252
EA ID / permit
SWS00435 · A00286
Outlet location
TQ9166020860 (OS grid reference) · View on Apple Maps
WFD catchment
Tillingham (GB107040013560)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Tillingham 0 0.0 no change 100%
Holbrook Road/Pyning Street CSO
Overflow on sewer network
Company site name
HOLBROOK ROAD PORTSMOUTH CSO - 108443
EA ID / permit
SWS00439 · A00357
Outlet location
SU6482000620 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Portsmouth Harbour; Spithead and Stokes Bay
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Portsmouth Harbour 0 0.0 no change 100%
Horebeech Lane Pumping Station
Storm discharge at pumping station
Company site name
HOREBEECH LANE HORAM CEO - 108254
EA ID / permit
SWS00446 · A00696
Outlet location
TQ5844016780 (OS grid reference) · View on Apple Maps
WFD catchment
Cuckmere from Warbleton to Lower Horsebridge (GB107041012390)
2024 spills / hours
44 / 566
Long-term average
27.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Freshwater River 0 0.0 down 100% 100%
Horsted Keynes WwTW
Inlet overflow at sewage works
Sewage works
Horsted Keynes
Company site name
HORSTED KEYNES CEO - 115988
EA ID / permit
SWS00451 · A00192
Outlet location
TQ3760028280 (OS grid reference) · View on Apple Maps
WFD catchment
Cockhaise Brook (GB107041012740)
2024 spills / hours
0 / 0.0
Long-term average
1.3 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Cockhaise Brook 0 0.0 no change 100%
Houghton Road Stockbridge Ceo
Storm discharge at pumping station
Company site name
HOUGHTON ROAD STOCKBRIDGE CEO - 108487
EA ID / permit
SWS00454 · A01306
Outlet location
SU3520034970 (OS grid reference) · View on Apple Maps
WFD catchment
R. Test (Middle) (GB107042022670)
2024 spills / hours
5 / 6.1
Long-term average
0.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Test 0 0.0 down 100% 100%
Ingleside Netley Pumping Station
Storm discharge at pumping station
Company site name
INGLESIDE NETLEY CEO - 108447
EA ID / permit
SWS00463 · A00204
Outlet location
SU4647008890 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water; Approaches to Southampton Water
2024 spills / hours
0 / 0.0
Long-term average
0.1 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tributary to Spear Pond Gully 0 0.0 no change 100%
Junction East of Fairplace Hill
Overflow on sewer network
Company site name
LONDON ROAD BURGESS HILL CSO - 109221
EA ID / permit
SWS00470 · W00421
Outlet location
TQ3113020180 (OS grid reference) · View on Apple Maps
WFD catchment
R. Adur East (GB107041012220)
2024 spills / hours
0 / 0.0
Long-term average
0.3 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Freshwater River 0 0.0 no change 88%
Kings Somborne WwTW
Inlet overflow at sewage works
Sewage works
Kings Somborne
Company site name
KINGS SOMBORNE CEO - 115989
EA ID / permit
SWS00477 · W00237
Outlet location
SU3373028750 (OS grid reference) · View on Apple Maps
WFD catchment
R. Test (Middle) (GB107042022670)
2024 spills / hours
0 / 0.0
Long-term average
3.1 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Tributary of the River Test 0 0.0 no change 100%
Kite Hill Wootton Ceo
Storm discharge at pumping station
Company site name
KITE HILL WOOTTON CEO - 108531
EA ID / permit
SWS00484 · A01420
Outlet location
SZ5478091950 (OS grid reference) · View on Apple Maps
WFD catchment
Blackbridge Brook (GB107101006100)
Shellfish water
Cowes and Medina; Ryde
2024 spills / hours
33 / 284
Long-term average
21.4 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
The Wootton Creek 0 0.0 down 100% 100%
Knightrider Street CSO
Overflow on sewer network
Company site name
KNIGHTRIDER STREET MAIDSTONE CSO - 108667
EA ID / permit
SWS00485 · K02071
Outlet location
TQ7596055370 (OS grid reference) · View on Apple Maps
WFD catchment
Medway at Maidstone (GB106040018440)
2024 spills / hours
1 / 0.1
Long-term average
1.4 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Medway 0 0.0 down 100% 48%
Lees Lane Gosport Ceo
Storm discharge at pumping station
Company site name
LEES LANE GOSPORT CEO - 108828
EA ID / permit
SWS00499 · A01368
Outlet location
SU6104000663 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Central Solent; Portsmouth Harbour; Ryde; Spithead and Stokes Bay
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Portsmouth Harbour 0 0.0 no change 100%
Leigh Road Hildenborough CSO
Overflow on sewer network
Company site name
LEIGH ROAD HILDENBOROUGH CSO - 109117
EA ID / permit
SWS00500 · A01348
Outlet location
TQ5708048120 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Eden Confluence to Yalding (GB106040018182)
2024 spills / hours
0 / 0.0
Long-term average
0.8 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
A Trib of the River Medway 0 0.0 no change 76%
Lenham Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Lenham
Company site name
LENHAM SSO - 115820
EA ID / permit
SWS00501 · W00517
Outlet location
TQ9048050880 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Great Stour (GB107040019660)
2024 spills / hours
1 / 9.3
Long-term average
2.8 spills a year (monitored since 2016)
Monitor below 90%
Comms failure / issue · Resolved - Jul
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tributary of the Great Stour 0 0.0 down 100% 49%
Locksgreen PS CSO
Storm discharge at pumping station
Company site name
LOCKS GREEN PORCHFIELD CEO - 108536
EA ID / permit
SWS00514 · A01140
Outlet location
SZ4435090630 (OS grid reference) · View on Apple Maps
WFD catchment
NEWTOWN RIVER (GB520710101700)
Shellfish water
Cowes and Medina; Lymington and Sowley; Newtown
2024 spills / hours
0 / 0.0
Long-term average
0.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tributary of Clamerkin Brook 0 0.0 no change 100%
Lower Road, Lower Halstow Ceo
Storm discharge at pumping station
Company site name
LOWER ROAD LOWER HALSTOW CEO - 108748
EA ID / permit
SWS00520 · A00605
Outlet location
TQ8596067310 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
0 / 0.0
Long-term average
0.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The Halstow Creek: Trib Medway 0 0.0 no change 96%
Lumley Road Pumping Station
Storm discharge at pumping station
Company site name
LUMLEY ROAD LUMLEY CEO - 108278
EA ID / permit
SWS00526 · A00291
Outlet location
SU7518006240 (OS grid reference) · View on Apple Maps
WFD catchment
R. Ems (GB107041012370)
Shellfish water
Chichester Harbour (Chichester Channel); Chichester Harbour (Emsworth Channel); Chichester Harbour (Thornham Channel); Langstone Harbour
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Ems 0 0.0 no change 100%
Magpie Hall Road Outside 60 CSO
Overflow on sewer network
Company site name
MAGPIE HALL ROAD CHATHAM OUTSIDE 60 CSO - 108673
EA ID / permit
SWS00536 · A01458
Outlet location
TQ7562068130 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Medway Estuary 0 0.0 no change 65%
Maple Walk Tank CSO
Overflow on sewer network
Company site name
MAPLE WALK BEXHILL CSO - 102404
EA ID / permit
SWS00546 · A00745
Outlet location
TQ7075007290 (OS grid reference) · View on Apple Maps
WFD catchment
East Stream (GB107041012430)
Bathing water
Norman`s Bay
2024 spills / hours
0 / 0.0
Long-term average
1.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Freshwater River 0 0.0 no change 95%
Marine Terrace C S O
Storm discharge at pumping station
Company site name
MARINE TERRACE MARGATE CSO - 107369
EA ID / permit
SWS00552 · A00782
Outlet location
TR3516070980 (OS grid reference) · View on Apple Maps
WFD catchment
Kent North (GB650704510000)
Bathing water
Margate Fulsam Rock; Margate The Bay; St Mildred's Bay, Westgate; Walpole Bay, Margate; West Bay, Westgate; Westbrook Bay, Margate
Shellfish water
Margate
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Controlled Sea 0 0.0 no change 100%
Marlborough Gardens Hedge End Ceo
Storm discharge at pumping station
Company site name
MARLBOROUGH GARDENS HEDGE END CEO - 110195
EA ID / permit
SWS00554 · A01369
Outlet location
SU4928015270 (OS grid reference) · View on Apple Maps
WFD catchment
Horton Heath Stream (GB107042016270)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Moorgreen Stream 0 0.0 no change 100%
Martello Road Seaford CSO
Storm discharge at pumping station
Company site name
MARTELLO ROAD SEAFORD CSO - 108081
EA ID / permit
SWS00558 · A01001
Outlet location
TV4871098100 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Seaford
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
English Channel at Seaford Bay 0 0.0 no change 100%
Marys Cottage
Overflow on sewer network
Company site name
VALE ROAD MAYFIELD CSO - 108285
EA ID / permit
SWS00560 · A01000
Outlet location
TQ5864026460 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Rother, Coggins Mill to Five Ashes (GB107040013490)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Freshwater River 0 0.0 no change 100%
Medway Road CSO
Overflow on sewer network
Company site name
MEDWAY ROAD GILLINGHAM CSO - 108876
EA ID / permit
SWS00561 · A01151
Outlet location
TQ7784069770 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
0 / 0.0
Long-term average
0.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Saline Estuary 0 0.0 no change 100%
Middlecroft Lane Gosport CSO
Overflow on sewer network
Company site name
MIDDLECROFT LANE GOSPORT CSO - 108848
EA ID / permit
SWS00565 · A01447
Outlet location
SU6102000650 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Central Solent; Portsmouth Harbour; Ryde; Spithead and Stokes Bay
2024 spills / hours
0 / 0.0
Long-term average
0.9 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Portsmouth Harbour 0 0.0 no change 100%
Millway Sittingbourne CSO
Overflow on sewer network
Company site name
MILL WAY SITTINGBOURNE CSO - 108685
EA ID / permit
SWS00580 · A00443
Outlet location
TQ9079064450 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central
2024 spills / hours
1 / 0.3
Long-term average
1.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Milton Creek 0 0.0 down 100% 95%

Sewage treatment works

Storm tanks and inlet overflows at each Southern 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.