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
Old Road West Gravesend CSO
Overflow on sewer network
Company site name
OLD ROAD WEST GRAVESEND CSO - 108693
EA ID / permit
SWS00627 · CASM.0008
Outlet location
TQ6481074520 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
9 / 8.0
Long-term average
8.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 10 hours spilling →
Tidal River Thames 16 10 up 78% 100%
Kings Road Emsworth CSO
Overflow on sewer network
Company site name
KINGS ROAD EMSWORTH CSO - 109298
EA ID / permit
SWS00476 · H02829
Outlet location
SU7427105341 (OS grid reference) · View on Apple Maps
WFD catchment
CHICHESTER HARBOUR (GB580705210000)
Shellfish water
Chichester Harbour (Emsworth Channel); Chichester Harbour (Thornham Channel); Langstone Harbour
2024 spills / hours
4 / 32
Long-term average
5.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 10 hours spilling →
Nore Rithe/Emsworth Harbour 2 10 down 50% 100%
Dambridge Wingham WwTW
Storm tank at sewage works
Sewage works
Dambridge Wingham
Company site name
DAMBRIDGE WINGHAM SSO - 115797
EA ID / permit
SWS00244 · W00519
Outlet location
TR2533057530 (OS grid reference) · View on Apple Maps
WFD catchment
Wingham River (GB107040019570)
2024 spills / hours
4 / 10.0
Long-term average
3.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 10 hours spilling →
Wingham River 4 10 no change 99%
Cricket Salts Rye Ceo
Storm discharge at pumping station
Company site name
CRICKET SALTS RYE CEO - 111926
EA ID / permit
SWS00224 · NPSWQD010089
Outlet location
TQ9246020890 (OS grid reference) · View on Apple Maps
WFD catchment
ROTHER (GB540704016100)
2024 spills / hours
32 / 81
Long-term average
26.0 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 10.0 hours spilling →
The River Rother 19 10.0 down 41% 99%
Woodchurch Crescent Gillingham CSO
Overflow on sewer network
Company site name
WOODCHURCH CRESCENT GILLINGHAM CSO - 103116
EA ID / permit
SWS00964 · A01322
Outlet location
TQ8146067890 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
24 / 11
Long-term average
22.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 10.0 hours spilling →
The River Medway Estuary 16 10.0 down 33% 100%
East Dean WwTW
Storm tank at sewage works
Sewage works
East Dean
Company site name
EAST DEAN SSO - 115829
EA ID / permit
SWS00268 · W00329
Outlet location
TV5576096310 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Birling Gap
2024 spills / hours
16 / 39
Long-term average
8.7 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.7 hours spilling →
Groundwaters via Infiltration 4 9.7 down 75% 99%
Harrietsham WwTW
Storm tank at sewage works
Sewage works
Harrietsham
Company site name
HARRIETSHAM SSO - 115874
EA ID / permit
SWS00400 · A00601
Outlet location
TQ8671052040 (OS grid reference) · View on Apple Maps
WFD catchment
Len (GB106040018430)
2024 spills / hours
2 / 16
Long-term average
4.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.7 hours spilling →
The River Len 1 9.7 down 50% 96%
Tankerton Bay Outfall
Overflow on sewer network
Company site name
TANKERTON CIRCUS CSO - 103281
EA ID / permit
SWS00848 · A00774
Outlet location
TR1156067390 (OS grid reference) · View on Apple Maps
WFD catchment
Whitstable Bay (GB640604290000)
Bathing water
Ventnor; West Beach, Whitstable
Shellfish water
Swale East; Swalecliffe
2024 spills / hours
24 / 12
Long-term average
15.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 9.7 hours spilling →
Controlled Sea 14 9.7 down 42% 99%
Rushlake Green WwTW
Inlet overflow at sewage works
Sewage works
Rushlake Green
Company site name
RUSHLAKE GREEN CSO - 116000
EA ID / permit
SWS00726 · NPSWQD003871
Outlet location
TQ6285018040 (OS grid reference) · View on Apple Maps
WFD catchment
Nunningham Stream (GB107041012610)
2024 spills / hours
10 / 62
Long-term average
4.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.6 hours spilling →
Clippingham Stream 1 9.6 down 90% 100%
Tankerton Bay Outfall
Overflow on sewer network
Company site name
NORTHWOOD ROAD WHITSTABLE NO 2 CSO - 103280
EA ID / permit
SWS00847 · A00774
Outlet location
TR1156067390 (OS grid reference) · View on Apple Maps
WFD catchment
Whitstable Bay (GB640604290000)
Bathing water
Ventnor; West Beach, Whitstable
Shellfish water
Swale East; Swalecliffe
2024 spills / hours
11 / 7.6
Long-term average
10.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.6 hours spilling →
Controlled Sea 11 9.6 no change 100%
Cliff End Wwps Seaford
Storm discharge at pumping station
Company site name
CLIFF END SEAFORD CEO - 101257
EA ID / permit
SWS00184 · A01231
Outlet location
TV4871098100 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Seaford
2024 spills / hours
18 / 23
Long-term average
7.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.6 hours spilling →
English Channel 11 9.6 down 39% 100%
Chapel Wharf Wps
Storm discharge at pumping station
Company site name
ALBERT ROAD CHAPEL DEPOT CEO - 108788
EA ID / permit
SWS00160 · A01146
Outlet location
SU4315011470 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
40 / 336
Long-term average
13.1 spills a year (monitored since 2016)
Monitor below 90%
Comms failure / issue · Resolved - Sep
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.5 hours spilling →
River Itchen Estuary 3 9.5 down 93% 26%
Cow Lane/Elms Vale Road Tank
Overflow on sewer network
Company site name
FOLKESTONE ROAD DOVER CSO - 100263
EA ID / permit
SWS00212 · A00718
Outlet location
TR3052041190 (OS grid reference) · View on Apple Maps
WFD catchment
Dour from Kearsney to Dover (GB107040073310)
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
Volume & pollution
Estimate from 9.5 hours spilling →
Freshwater River 6 9.5 up from 0 100%
Millbrook WwTW
Inlet overflow at sewage works
Sewage works
Millbrook
Company site name
MILLBROOK CSO - 116169
EA ID / permit
SWS00578 · A00016
Outlet location
SU3871011760 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
23 / 75
Long-term average
8.6 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.4 hours spilling →
The River Test 6 9.4 down 74% 100%
Eastbourne WwTW
Inlet overflow at sewage works
Sewage works
Eastbourne
Company site name
EASTBOURNE NO.2 CEO - 115459
EA ID / permit
SWS00275 · A01106
Outlet location
TQ6430000900 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Eastbourne; Pevensey Bay
2024 spills / hours
4 / 7.5
Long-term average
24.8 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
Volume & pollution
Estimate from 9.3 hours spilling →
The English Channel 5 9.3 up 25% 70%
St Helens Down, Hastings CSO
Overflow on sewer network
Company site name
ST HELENS DOWN HASTINGS CSO - 109050
EA ID / permit
SWS00808 · A01184
Outlet location
TQ8184009251 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Hastings Pelham Beach; St Leonards
2024 spills / hours
15 / 22
Long-term average
10.8 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.1 hours spilling →
English Channel, via Sewer 12 9.1 down 20% 100%
Breadlands Road Ashford CSO
Overflow on sewer network
Company site name
BREADLANDS ROAD ASHFORD CSO - 108758
EA ID / permit
SWS00091 · A00902
Outlet location
TR0242041270 (OS grid reference) · View on Apple Maps
WFD catchment
Aylesford Stream (GB107040019650)
2024 spills / hours
6 / 5.0
Long-term average
7.0 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 9.0 hours spilling →
Trib of the East Stour River 10 9.0 up 67% 79%
Margate Headworks
Storm discharge at pumping station
Company site name
MARGATE LONG CEO - 116100
EA ID / permit
SWS00549 · A01213
Outlet location
TR3885073460 (OS grid reference) · View on Apple Maps
WFD catchment
Kent North (GB650704510000)
Bathing water
Botany Bay, Broadstairs; Broadstairs, Stone Bay; Joss Bay, Broadstairs; Margate Fulsam Rock; Margate The Bay; Walpole Bay, Margate
Shellfish water
Margate
2024 spills / hours
4 / 7.3
Long-term average
5.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.8 hours spilling →
The North Sea 3 8.8 down 25% 99%
York Road Bexhill Ceo
Storm discharge at pumping station
Company site name
YORK ROAD BEXHILL CSO - 111906
EA ID / permit
SWS00978 · A01265
Outlet location
TQ7649008220 (OS grid reference) · View on Apple Maps
WFD catchment
Combe Haven between Powdermill Str conf and Coast (GB107041012480)
Bathing water
Bexhill; St Leonards
2024 spills / hours
14 / 42
Long-term average
10.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.7 hours spilling →
Combe Haven 5 8.7 down 64% 99%
College Street Petersfield CSO
Overflow on sewer network
Company site name
COLLEGE STREET PETERSFIELD CSO - 108414
EA ID / permit
SWS00192 · A00363
Outlet location
SU7490023360 (OS grid reference) · View on Apple Maps
WFD catchment
Western Rother (Upstream Petersfield) (GB107041012840)
2024 spills / hours
2 / 2.9
Long-term average
2.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.5 hours spilling →
Unnamed Strm to Tilmore Brook 4 8.5 up 100% 98%
Waites Lane CSO
Overflow on sewer network
Company site name
WAITES LANE FAIRLIGHT CSO - 108374
EA ID / permit
SWS00904 · K01523
Outlet location
TQ8752012200 (OS grid reference) · View on Apple Maps
WFD catchment
Marsham and Pannel Sewers (GB107040013390)
2024 spills / hours
20 / 40
Long-term average
12.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 8.4 hours spilling →
Trib of the Marsham Sewer 10 8.4 down 50% 100%
Taylors Lane Bosham, Wwps
Storm discharge at pumping station
Company site name
TAYLORS LANE BOSHAM PUMPED SSO - 116066
EA ID / permit
SWS00853 · A01219
Outlet location
SU8100003760 (OS grid reference) · View on Apple Maps
WFD catchment
CHICHESTER HARBOUR (GB580705210000)
Shellfish water
Chichester Harbour (Chichester Channel)
2024 spills / hours
22 / 193
Long-term average
10.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.3 hours spilling →
Chichester Harbour 3 8.3 down 86% 100%
Coldwaltham WwTW
Inlet overflow at sewage works
Sewage works
Coldwaltham
Company site name
COLDWALTHAM CSO - 116054
EA ID / permit
SWS00191 · W00379
Outlet location
TQ0219015840 (OS grid reference) · View on Apple Maps
WFD catchment
ARUN (GB540704105000)
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
Volume & pollution
Estimate from 8.2 hours spilling →
A Tributary of the River Arun 1 8.2 up from 0 100%
Memorial Park Romsey Ceo
Storm discharge at pumping station
Company site name
MEMORIAL PARK ROMSEY CEO - 110235
EA ID / permit
SWS00563 · EPR/LB3797AB
Outlet location
SU3488020780 (OS grid reference) · View on Apple Maps
WFD catchment
R. Test (GB107042016460)
2024 spills / hours
4 / 34
Long-term average
1.1 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.1 hours spilling →
River Test 1 8.1 down 75% 75%
South Street Chailey SPS
Storm discharge at pumping station
Company site name
SOUTH STREET CHAILEY CEO - 108337
EA ID / permit
SWS00791 · A01407
Outlet location
TQ3922018510 (OS grid reference) · View on Apple Maps
WFD catchment
Longford Stream (GB107041012960)
2024 spills / hours
5 / 20
Long-term average
4.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.1 hours spilling →
Longford Stream 1 8.1 down 80% 99%
Blechynden Terrace Southampton CSO
Overflow on sewer network
Company site name
BLECHYNDEN TERRACE SOUTHAMPTON CSO - 108396
EA ID / permit
SWS00073 · A01288
Outlet location
SU4150011090 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
9 / 11
Long-term average
11.6 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.1 hours spilling →
River Test 6 8.1 down 33% 100%
Park Road Chandlers Ford CSO
Overflow on sewer network
Company site name
PARK ROAD CHANDLERS FORD CSO - 108449
EA ID / permit
SWS00642 · H01072
Outlet location
SU4342020980 (OS grid reference) · View on Apple Maps
WFD catchment
Monks Brook (GB107042016310)
2024 spills / hours
4 / 9.7
Long-term average
2.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.0 hours spilling →
Monks Brook 3 8.0 down 25% 100%
Iwade Combined Emergency Overflow
Storm discharge at pumping station
Company site name
IWADE CEO - 108662
EA ID / permit
SWS00466 · K01547
Outlet location
TQ9005067790 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
1 / 0.2
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
Volume & pollution
Estimate from 8.0 hours spilling →
Ditch Leading to River Swale 2 8.0 up 100% 100%
Sea Lane CSO Goring Worthing
Storm discharge at pumping station
Company site name
SEA LANE GORING CSO - 109115
EA ID / permit
SWS00752 · A01478
Outlet location
TQ1124001710 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Worthing; Goring Beach
2024 spills / hours
13 / 60
Long-term average
6.3 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 8.0 hours spilling →
English Channel 4 8.0 down 69% 100%
Trafalgar Way Stockbridge Ceo
Storm discharge at pumping station
Company site name
TRAFALGAR WAY STOCKBRIDGE CEO - 108500
EA ID / permit
SWS00884 · A01307
Outlet location
SU3584034940 (OS grid reference) · View on Apple Maps
WFD catchment
R. Test (Middle) (GB107042022670)
2024 spills / hours
5 / 16
Long-term average
3.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.9 hours spilling →
River Test 2 7.9 down 60% 100%
Lake Road Combined Sewer Overflow
Overflow on sewer network
Company site name
LAKE ROAD TUNBRIDGE WELLS CSO - 111357
EA ID / permit
SWS00487 · A01431
Outlet location
TQ5723039990 (OS grid reference) · View on Apple Maps
WFD catchment
Barden Mill Stream (GB106040018100)
2024 spills / hours
11 / 21
Long-term average
10.5 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 7.7 hours spilling →
The Hurstwood Stream 9 7.7 down 18% 100%
Fairthorne Manor Ceo
Storm discharge at pumping station
Company site name
FAIRTHORNE MANOR CEO - 108834
EA ID / permit
SWS00298 · A01384
Outlet location
SU5234012140 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
2024 spills / hours
8 / 49
Long-term average
4.1 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.7 hours spilling →
Shawfords Lake 3 7.7 down 63% 100%
Whitford Bridge CSO
Overflow on sewer network
Company site name
WHITFORD BRIDGE NORTHWOOD CSO - 101029
EA ID / permit
SWS00942 · A00730
Outlet location
SZ4746093530 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Cowes; Gurnard
Shellfish water
Cowes and Medina; Lepe Middle Bank; Lymington and Sowley; Newtown
2024 spills / hours
4 / 7.1
Long-term average
1.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.5 hours spilling →
Gurnard Luck Stream 4 7.5 no change 100%
Bog Farm Brabourne Lees Ceo
Storm discharge at pumping station
Company site name
BOG FARM BRABOURNE LEES CEO - 108588
EA ID / permit
SWS00076 · W00580
Outlet location
TR0830040100 (OS grid reference) · View on Apple Maps
WFD catchment
East Stour (GB107040019640)
2024 spills / hours
4 / 7.1
Long-term average
5.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.5 hours spilling →
Trib of the East Stour River 6 7.5 up 50% 100%
Budds Farm Havant Ceo
Inlet overflow at sewage works
Sewage works
Budds Farm Havant Ceo
Company site name
BUDDS FARM HAVANT SE7 CEO - 116073
EA ID / permit
SWS00120 · A00752
Outlet location
SU7067005670 (OS grid reference) · View on Apple Maps
WFD catchment
LANGSTONE HARBOUR (GB580705130000)
Shellfish water
Chichester Harbour (Emsworth Channel); Langstone Harbour; Portsmouth Harbour
2024 spills / hours
5 / 14
Long-term average
3.6 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 7.5 hours spilling →
Brockhampton Creek 3 7.5 down 40% 100%
Hope Beach Wps
Storm discharge at pumping station
Company site name
HOPE BEACH SHANKLIN NEW CEO - 109389
EA ID / permit
SWS00445 · A01109
Outlet location
SZ5906081850 (OS grid reference) · View on Apple Maps
WFD catchment
Isle of Wight East (GB650705530000)
Bathing water
Sandown; Shanklin; Yaverland
2024 spills / hours
21 / 94
Long-term average
11.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.3 hours spilling →
English Channel 9 7.3 down 57% 100%
Lower Waites Lane Fairlight CSO
Overflow on sewer network
Company site name
LOWER WAITES LANE FAIRLIGHT NO 2 CSO - 108277
EA ID / permit
SWS00295 · K01519
Outlet location
TQ8812012270 (OS grid reference) · View on Apple Maps
WFD catchment
Marsham and Pannel Sewers (GB107040013390)
2024 spills / hours
15 / 48
Long-term average
12.3 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 7.2 hours spilling →
Tributary of Marsham Sewer 10 7.2 down 33% 100%
Newbridge Road Newbridge Ceo
Storm discharge at pumping station
Company site name
NEWBRIDGE ROAD NEWBRIDGE CEO - 108542
EA ID / permit
SWS00598 · W00196
Outlet location
SZ4133087520 (OS grid reference) · View on Apple Maps
WFD catchment
Caul Bourne (GB107101006020)
Shellfish water
Newtown; Yarmouth
2024 spills / hours
29 / 58
Long-term average
8.3 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.1 hours spilling →
Caul Bourne 3 7.1 down 90% 100%
Margate Headworks
Storm discharge at pumping station
Company site name
MARGATE SHORT CEO - 116101
EA ID / permit
SWS00550 · A01213
Outlet location
TR3885073460 (OS grid reference) · View on Apple Maps
WFD catchment
Kent North (GB650704510000)
Bathing water
Botany Bay, Broadstairs; Broadstairs, Stone Bay; Joss Bay, Broadstairs; Margate Fulsam Rock; Margate The Bay; Walpole Bay, Margate
Shellfish water
Margate
2024 spills / hours
3 / 3.5
Long-term average
3.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 7.0 hours spilling →
The North Sea 3 7.0 no change 99%
Bury Road Gosport Ceo
Storm discharge at pumping station
Company site name
BURY ROAD GOSPORT CEO - 108846
EA ID / permit
SWS00129 · A01382
Outlet location
SZ6075099260 (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
4 / 2.4
Long-term average
1.7 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
Volume & pollution
Estimate from 6.9 hours spilling →
Workhouse Lake 4 6.9 no change 100%
Bridgefoot Pumping Station
Storm discharge at pumping station
Company site name
BRIDGEFOOT KIRDFORD CEO - 108193
EA ID / permit
SWS00096 · A00619
Outlet location
TQ0166026320 (OS grid reference) · View on Apple Maps
WFD catchment
R. Kird (GB107041012300)
2024 spills / hours
2 / 12
Long-term average
6.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.9 hours spilling →
Freshwater River 1 6.9 down 50% 100%
Portsmouth Lane CSO
Storm discharge at pumping station
Company site name
PORTSMOUTH LANE LINDFIELD CEO - 108316
EA ID / permit
SWS00673 · A01013
Outlet location
TQ3377025730 (OS grid reference) · View on Apple Maps
WFD catchment
Scrase Bridge Stream at Haywards Heath (GB107041012680)
2024 spills / hours
6 / 19
Long-term average
3.4 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 6.8 hours spilling →
Freshwater River 2 6.8 down 67% 100%
Northfleet WwTW
Storm tank at sewage works
Sewage works
Northfleet
Company site name
NORTHFLEET SSO - 115753
EA ID / permit
SWS00618 · CSSC.0411
Outlet location
TQ6178074920 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
5 / 11
Long-term average
3.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.8 hours spilling →
Tidal River Thames 2 6.8 down 60% 100%
Garnier Road
Storm discharge at pumping station
Company site name
GARNIER ROAD WINCHESTER CEO - 108433
EA ID / permit
SWS00344 · H01523
Outlet location
SU4802028200 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (GB107042022580)
2024 spills / hours
2 / 7.1
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
Volume & pollution
Estimate from 6.7 hours spilling →
Freshwater River 2 6.7 no change 99%
Milford Road Pennington WwTW
Inlet overflow at sewage works
Sewage works
Milford Road Pennington
Company site name
MILFORD ROAD PENNINGTON CEO - 116102
EA ID / permit
SWS00655 · A00665
Outlet location
SZ3315091870 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Shellfish water
Lymington and Sowley; Pennington; Yarmouth
2024 spills / hours
6 / 43
Long-term average
1.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.5 hours spilling →
The Solent 1 6.5 down 83% 100%
Sirdar Road Southampton CSO
Overflow on sewer network
Company site name
SIRDAR ROAD SOUTHAMPTON CSO - 108794
EA ID / permit
SWS00777 · A01294
Outlet location
SU4359014960 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
33 / 81
Long-term average
21.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.5 hours spilling →
River Itchen 17 6.5 down 48% 100%
Eastchurch WwTW
Storm tank at sewage works
Sewage works
Eastchurch
Company site name
EASTCHURCH SSO - 115408
EA ID / permit
SWS00276 · W00512
Outlet location
TQ9816067380 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central; Swale East
2024 spills / hours
4 / 13
Long-term average
6.6 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.4 hours spilling →
The Windmill Creek 2 6.4 down 50% 100%
Little Groves Leysdown on Sea Wwps
Storm discharge at pumping station
Company site name
LITTLE GROVES LEYSDOWN ON SEA CEO - 108117
EA ID / permit
SWS00511 · A01378
Outlet location
TR0296070860 (OS grid reference) · View on Apple Maps
WFD catchment
Whitstable Bay (GB640604290000)
Bathing water
Leysdown
Shellfish water
Sheppey; Swale Central; Swale East; Swalecliffe
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
Volume & pollution
Estimate from 6.3 hours spilling →
The North Sea (via Drain) 2 6.3 up from 0 100%
Riding Lane Hildenborough CSO
Overflow on sewer network
Company site name
RIDING LANE HILDENBOROUGH CSO - 108716
EA ID / permit
SWS00708 · A00416
Outlet location
TQ5687049550 (OS grid reference) · View on Apple Maps
WFD catchment
Hilden Brook (GB106040018170)
2024 spills / hours
0 / 0.0
Long-term average
5.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 6.3 hours spilling →
The Hilden Brook 3 6.3 up from 0 97%
Western Road Haywards Heath CSO
Overflow on sewer network
Company site name
WESTERN ROAD HAYWARDS HEATH CSO - 108811
EA ID / permit
SWS00931 · A01096
Outlet location
TQ3399023930 (OS grid reference) · View on Apple Maps
WFD catchment
Scrase Bridge Stream at Haywards Heath (GB107041012680)
2024 spills / hours
7 / 6.6
Long-term average
4.8 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 6.3 hours spilling →
Trib. of Scrase Bridge Stream 7 6.3 no change 100%

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.