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
Main Road Hunston Ceo
Storm discharge at pumping station
Company site name
MAIN ROAD HUNSTON CEO - 108280
EA ID / permit
SWS00540 · A01139
Outlet location
SU8605001630 (OS grid reference) · View on Apple Maps
WFD catchment
Bremere Rife (GB107041006610)
Shellfish water
Chichester Harbour (Chichester Channel)
2024 spills / hours
9 / 75
Long-term average
5.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 33 hours spilling →
Bremere Rife 4 33 down 56% 100%
Motney Hill WwTW
Storm tank at sewage works
Sewage works
Motney Hill
Company site name
MOTNEY HILL NO.2 SSO - 115456
EA ID / permit
SWS00587 · A00720
Outlet location
TQ8315069000 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
3 / 9.9
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 33 hours spilling →
The Medway Estaury 5 33 up 67% 100%
The Gillies Fareham CSO
Overflow on sewer network
Company site name
THE GILLIES FAREHAM CSO - 103266
EA ID / permit
SWS00860 · A00337
Outlet location
SU5722005970 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Shellfish water
Portsmouth Harbour
2024 spills / hours
8 / 33
Long-term average
13.2 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 33 hours spilling →
Blackbrook Stream 11 33 up 38% 100%
Maidstone Road Rainham CSO
Overflow on sewer network
Company site name
MAIDSTONE ROAD RAINHAM CSO - 108676
EA ID / permit
SWS00538 · EPR/DB3797AW
Outlet location
TQ8270067420 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
32 / 35
Long-term average
24.6 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 33 hours spilling →
The Otterham Creek 26 33 down 19% 100%
Gainsborough Drive Wwps, Herne Bay
Storm discharge at pumping station
Company site name
GAINSBOROUGH DRIVE HERNE BAY CEO - 111725
EA ID / permit
SWS00341 · A01477
Outlet location
TR2050068490 (OS grid reference) · View on Apple Maps
WFD catchment
Kent North (GB650704510000)
Bathing water
Herne Bay; Herne Bay Central
Shellfish water
Margate; Swalecliffe
2024 spills / hours
8 / 5.9
Long-term average
11.0 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 32 hours spilling →
North Sea via A Ditch 9 32 up 13% 74%
Godshill WwTW
Inlet overflow at sewage works
Sewage works
Godshill
Company site name
GODSHILL CSO - 115983
EA ID / permit
SWS00356 · W00147
Outlet location
SZ5257082660 (OS grid reference) · View on Apple Maps
WFD catchment
R. Eastern Yar (GB107101006220)
2024 spills / hours
32 / 85
Long-term average
15.8 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 32 hours spilling →
Tributary of Godshill Stream 8 32 down 75% 100%
Kingston Hollow WwTW
Inlet overflow at sewage works
Sewage works
Kingston Hollow
Company site name
KINGSTON HOLLOW CEO - 115990
EA ID / permit
SWS00482 · A01223
Outlet location
TQ4051008180 (OS grid reference) · View on Apple Maps
WFD catchment
Iford Marshes (GB107041013080)
2024 spills / hours
54 / 261
Long-term average
33.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 32 hours spilling →
Celery Sewer Trib.R. Ouse 19 32 down 65% 100%
Harestock Wastewater Treatment Work
Storm tank at sewage works
Sewage works
Harestock Wastewater Treatment Work
Company site name
HARESTOCK SSO - 115789
EA ID / permit
SWS00399 · W00235
Outlet location
SU4928031420 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (GB107042022580)
2024 spills / hours
98 / 2,042
Long-term average
19.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 32 hours spilling →
The River Itchen 4 32 down 96% 100%
Station Road Rainham CSO
Overflow on sewer network
Company site name
STATION ROAD RAINHAM CSO - 108738
EA ID / permit
SWS00827 · EPR/DB3797EY
Outlet location
TQ8270067420 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
7 / 60
Long-term average
13.2 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 32 hours spilling →
The Otterham Creek 30 32 up 329% 100%
School Lane Hamble Ceo
Storm discharge at pumping station
Company site name
SCHOOL LANE HAMBLE CEO - 108826
EA ID / permit
SWS00750 · A01376
Outlet location
SU4830006240 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water; Approaches to Southampton Water; Stanswood Bay
2024 spills / hours
20 / 97
Long-term average
10.6 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 32 hours spilling →
River Hamble 12 32 down 40% 100%
Buriton WwTW
Inlet overflow at sewage works
Sewage works
Buriton
Company site name
BURITON CEO - 116096
EA ID / permit
SWS00124 · W00325
Outlet location
SU7419020590 (OS grid reference) · View on Apple Maps
WFD catchment
Stanbridge Stream (GB107041012790)
2024 spills / hours
116 / 2,285
Long-term average
38.8 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 31 hours spilling →
Trib of Stanbridge Stream 4 31 down 97% 96%
Wards Hill Wastewater P S
Storm discharge at pumping station
Company site name
WARDS HILL ROAD MINSTER IOS CEO - 107413
EA ID / permit
SWS00909 · A00771
Outlet location
TQ9454073790 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES LOWER (GB530603911401)
Bathing water
Minster Leas; Sheerness
Shellfish water
Outer Thames; Southend; Outer Thames; Sheppey; Southend
2024 spills / hours
6 / 17
Long-term average
8.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 30 hours spilling →
Freshwater River 6 30 no change 100%
Green Lane Lyndhurst Ceo
Storm discharge at pumping station
Company site name
GREEN LANE LYNDHURST CEO - 108892
EA ID / permit
SWS00369 · A01397
Outlet location
SU3060007660 (OS grid reference) · View on Apple Maps
WFD catchment
R. Beaulieu (GB107042016340)
2024 spills / hours
12 / 33
Long-term average
6.1 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 30 hours spilling →
Matley Bog Stream 7 30 down 42% 100%
High Street Fareham CSO
Overflow on sewer network
Company site name
HIGH STREET FAREHAM CSO - 108439
EA ID / permit
SWS00425 · A01050
Outlet location
SU5833006720 (OS grid reference) · View on Apple Maps
WFD catchment
R. Wallington (GB107042016360)
Shellfish water
Portsmouth Harbour
2024 spills / hours
85 / 848
Long-term average
28.2 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 30 hours spilling →
Wallington River 12 30 down 86% 100%
East Boldre S.T.W.
Storm tank at sewage works
Sewage works
East Boldre S T W
Company site name
EAST BOLDRE SSO - 115911
EA ID / permit
SWS00267 · W00250
Outlet location
SU3801000700 (OS grid reference) · View on Apple Maps
WFD catchment
Hatchet Stream (GB107042011400)
Shellfish water
Beaulieu River; Lepe Middle Bank; Lymington and Sowley
2024 spills / hours
21 / 251
Long-term average
18.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 29 hours spilling →
Hatchet Stream 6 29 down 71% 100%
Green Lane Chilworth Ceo
Storm discharge at pumping station
Company site name
GREEN LANE CHILWORTH CEO - 108785
EA ID / permit
SWS00367 · A01290
Outlet location
SU4204018020 (OS grid reference) · View on Apple Maps
WFD catchment
Monks Brook (GB107042016310)
2024 spills / hours
2 / 20
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 29 hours spilling →
Unnamed Trib of River Itchen 6 29 up 200% 100%
Rookley PS
Storm discharge at pumping station
Company site name
PRICHETTS WAY ROOKLEY CEO - 108517
EA ID / permit
SWS00719 · A00673
Outlet location
SZ5100084100 (OS grid reference) · View on Apple Maps
WFD catchment
R. Medina (GB107101005990)
2024 spills / hours
18 / 69
Long-term average
41.8 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 29 hours spilling →
Freshwater River 9 29 down 50% 100%
William Street Rainham CSO
Overflow on sewer network
Company site name
WILLIAM STREET RAINHAM CSO - 108024
EA ID / permit
SWS00949 · A00132
Outlet location
TQ8300067130 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
21 / 22
Long-term average
23.8 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 29 hours spilling →
The River Medway 21 29 no change 100%
The Spots P.S. Alfriston
Storm discharge at pumping station
Company site name
ALFRISTON CEO - 108359
EA ID / permit
SWS00866 · A00727
Outlet location
TQ5219003100 (OS grid reference) · View on Apple Maps
WFD catchment
CUCKMERE (GB540704104800)
2024 spills / hours
156 / 2,487
Long-term average
74.2 spills a year (monitored since 2016)
High-spill reason (company)
Performance - GW inundation
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 29 hours spilling →
River Cuckmere 34 29 down 78% 100%
Kings Manor Ceo
Storm discharge at pumping station
Company site name
KINGS MANOR CEO - 108530
EA ID / permit
SWS00475 · NPSWQD008724
Outlet location
SZ3504088550 (OS grid reference) · View on Apple Maps
WFD catchment
WESTERN YAR (GB520710101800)
Shellfish water
Lymington and Sowley; Pennington; Newtown; Yarmouth
2024 spills / hours
18 / 81
Long-term average
7.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 29 hours spilling →
The Yar Estuary 9 29 down 50% 100%
West Hoathly Ceo
Storm discharge at pumping station
Company site name
WEST HOATHLY CEO - 108378
EA ID / permit
SWS00922 · A01040
Outlet location
TQ3644032390 (OS grid reference) · View on Apple Maps
WFD catchment
Cockhaise Brook (GB107041012740)
2024 spills / hours
3 / 7.6
Long-term average
21.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 28 hours spilling →
Cockhaise Brook 10 28 up 233% 99%
Quay Street, Fareham CSO
Overflow on sewer network
Company site name
QUAY STREET FAREHAM CSO - 108476
EA ID / permit
SWS00687 · A00334
Outlet location
SU5800005970 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Shellfish water
Portsmouth Harbour
2024 spills / hours
11 / 15
Long-term average
18.1 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 28 hours spilling →
Fareham Creek/Portsmouth Hbr 5 28 down 55% 100%
New Romney WwTW
Storm tank at sewage works
Sewage works
New Romney
Company site name
NEW ROMNEY SSO - 115759
EA ID / permit
SWS00596 · A01500
Outlet location
TR0738023950 (OS grid reference) · View on Apple Maps
WFD catchment
Dengemarsh Sewer (GB107040013450)
Bathing water
Littlestone; St Mary's Bay (Kent)
2024 spills / hours
24 / 357
Long-term average
13.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 28 hours spilling →
The Littlestone Sewer 2 28 down 92% 100%
Yarmouth PS
Storm discharge at pumping station
Company site name
THE INSTITUTE YARMOUTH CEO - 108564
EA ID / permit
SWS00977 · A00671
Outlet location
SZ3542089930 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Colwell Bay
Shellfish water
Lymington and Sowley; Pennington; Newtown; Yarmouth
2024 spills / hours
12 / 21
Long-term average
9.2 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 28 hours spilling →
The Solent 12 28 no change 100%
Mainland PS
Storm discharge at pumping station
Company site name
MAINLAND DRAYTON SSO - 115960
EA ID / permit
SWS00541 · A00656
Outlet location
SU6722004240 (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
15 / 32
Long-term average
12.4 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 28 hours spilling →
Ports Creek 11 28 down 27% 100%
Waterfrets Langton Green CSO
Storm discharge at pumping station
Company site name
WATERFRETS LANGTON GREEN CSO - 108753
EA ID / permit
SWS00913 · K02060
Outlet location
TQ5513040080 (OS grid reference) · View on Apple Maps
WFD catchment
Barden Mill Stream (GB106040018100)
2024 spills / hours
26 / 37
Long-term average
12.3 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 28 hours spilling →
Tributary of Barden Stream 19 28 down 27% 100%
Gorrell Outfall via Diamond Rd CSO
Storm discharge at pumping station
Company site name
DIAMOND ROAD WHITSTABLE CEO - 103279
EA ID / permit
SWS00359 · A00773
Outlet location
TR1088067500 (OS grid reference) · View on Apple Maps
WFD catchment
Whitstable Bay (GB640604290000)
Bathing water
Tankerton; West Beach, Whitstable
Shellfish water
Swale East; Swalecliffe
2024 spills / hours
23 / 87
Long-term average
17.9 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 27 hours spilling →
Tankerton Bay 14 27 down 39% 100%
Cowstead Lane No 2 and 3 Outfalls
Overflow on sewer network
Company site name
BEECHINGS WAY GILLINGHAM NO 4 CSO - 101998
EA ID / permit
SWS00219 · A00136
Outlet location
TQ8139067910 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
21 / 17
Long-term average
26.3 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 27 hours spilling →
The Medway Estuary 28 27 up 33% 100%
Langbridge PS
Storm discharge at pumping station
Company site name
LANGBRIDGE CEO - 108534
EA ID / permit
SWS00492 · A00226
Outlet location
SZ5602085910 (OS grid reference) · View on Apple Maps
WFD catchment
Eastern Yar (Lower) (GB107101005971)
2024 spills / hours
20 / 109
Long-term average
12.0 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 27 hours spilling →
Eastern Yar 7 27 down 65% 100%
Kings Hall Wps, Herne Bay
Storm discharge at pumping station
Company site name
KINGS HALL HERNE BAY CEO - 108096
EA ID / permit
SWS00474 · A00642
Outlet location
TR1889069140 (OS grid reference) · View on Apple Maps
WFD catchment
Kent North (GB650704510000)
Bathing water
Herne Bay; Herne Bay Central
Shellfish water
Swale East; Swalecliffe; Margate
2024 spills / hours
14 / 31
Long-term average
15.2 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 26 hours spilling →
North Sea 8 26 down 43% 91%
Chiddingstone Causeway Pumping Stn
Storm discharge at pumping station
Company site name
CHIDDINGSTONE CAUSEWAY CEO - 108598
EA ID / permit
SWS00176 · A00241
Outlet location
TQ5164046530 (OS grid reference) · View on Apple Maps
WFD catchment
Eden at Bough Beech (GB106040018160)
2024 spills / hours
12 / 46
Long-term average
10.7 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 26 hours spilling →
Trib of River Eden 6 26 down 50% 100%
Chatham Hill Outside 425 CSO
Overflow on sewer network
Company site name
CHATHAM HILL CHATHAM OUTSIDE 425 CSO - 108603
EA ID / permit
SWS00166 · A00927
Outlet location
TQ7562068140 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
– / –
Long-term average
21.1 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 26 hours spilling →
River Medway Estuary 13 26 48%
St James Cottage Balcombe CSO
Overflow on sewer network
Company site name
ST JAMES COTTAGE BALCOMBE CSO - 108896
EA ID / permit
SWS00812 · A01441
Outlet location
TQ3124030580 (OS grid reference) · View on Apple Maps
WFD catchment
Shell Brook upstream of Ardingly Reservoir (GB107041018000)
2024 spills / hours
16 / 43
Long-term average
11.8 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 25 hours spilling →
Unnamed Trib of Balcombe Lake 10 25 down 38% 88%
CSO at Town Quay PS Arundel
Storm discharge at pumping station
Company site name
TOWN QUAY ARUNDEL CEO - 108012
EA ID / permit
SWS00231 · A00860
Outlet location
TQ0192007010 (OS grid reference) · View on Apple Maps
WFD catchment
ARUN (GB540704105000)
Bathing water
Littlehampton
2024 spills / hours
14 / 23
Long-term average
7.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 25 hours spilling →
Freshwater River 20 25 up 43% 100%
Pevensey PS No 4 CSO
Storm discharge at pumping station
Company site name
RATTLE ROAD WESTHAM CEO - 108315
EA ID / permit
SWS00663 · A01068
Outlet location
TQ6290004620 (OS grid reference) · View on Apple Maps
WFD catchment
Langley Sewer at Eastbourne (GB107041006650)
Bathing water
Pevensey Bay
2024 spills / hours
7 / 26
Long-term average
12.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 25 hours spilling →
Freshwater River 4 25 down 43% 100%
Faversham WwTW
Storm tank at sewage works
Sewage works
Faversham
Company site name
FAVERSHAM SSO - 115409
EA ID / permit
SWS00303 · W00511
Outlet location
TR0268062340 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central; Swale East
2024 spills / hours
7 / 71
Long-term average
7.0 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 25 hours spilling →
Faversham Creek 5 25 down 29% 94%
Simeon Street CSO
Overflow on sewer network
Company site name
SIMEON STREET RYDE CSO - 100129
EA ID / permit
SWS00775 · A00759
Outlet location
SZ5987092490 (OS grid reference) · View on Apple Maps
WFD catchment
Monktonmead Brook (GB107101006120)
Bathing water
Ryde; Seagrove
Shellfish water
Cowes and Medina; Ryde; Spithead and Stokes Bay
2024 spills / hours
7 / 33
Long-term average
6.2 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 25 hours spilling →
Monktonmead Brook 5 25 down 29% 97%
Tunbridge Wells (North) WwTW
Storm tank at sewage works
Sewage works
Tunbridge Wells
Company site name
TUNBRIDGE WELLS NORTH SSO - 115819
EA ID / permit
SWS00885 · A00814
Outlet location
TQ6031042610 (OS grid reference) · View on Apple Maps
WFD catchment
Somerhill Stream (GB106040018410)
2024 spills / hours
14 / 126
Long-term average
11.4 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 25 hours spilling →
The Somerhill Stream 6 25 down 57% 100%
Farhalls Crescent Horsham CSO
Overflow on sewer network
Company site name
FARHALLS CRESCENT HORSHAM CSO - 102550
EA ID / permit
SWS00302 · N02115
Outlet location
TQ1896032650 (OS grid reference) · View on Apple Maps
WFD catchment
Boldings Brook (GB107041012910)
2024 spills / hours
14 / 48
Long-term average
21.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 25 hours spilling →
Freshwater River 12 25 down 14% 100%
Bramble Drive Hailsham CSO
Overflow on sewer network
Company site name
BRAMBLE DRIVE HAILSHAM CSO - 108379
EA ID / permit
SWS00089 · D01054
Outlet location
TQ5834009430 (OS grid reference) · View on Apple Maps
WFD catchment
Cuckmere between Arlington and Lower Horsebridge (GB107041012930)
2024 spills / hours
14 / 48
Long-term average
14.4 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 25 hours spilling →
Tributary Cuckmere River 9 25 down 36% 79%
Hawthorne Avenue Gillingham CSO
Overflow on sewer network
Company site name
HAWTHORNE AVENUE GILLINGHAM CSO - 102229
EA ID / permit
SWS00410 · A01314
Outlet location
TQ8146067890 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
57 / 65
Long-term average
43.6 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 24 hours spilling →
The River Medway 22 24 down 61% 86%
Turkey Road Wps, Bexhill on Sea
Storm discharge at pumping station
Company site name
TURKEY ROAD BEXHILL CEO - 108369
EA ID / permit
SWS00889 · A01190
Outlet location
TQ7235009220 (OS grid reference) · View on Apple Maps
WFD catchment
East Stream (GB107041012430)
2024 spills / hours
27 / 116
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 24 hours spilling →
Unnamed Trib of Wallers Haven 9 24 down 67% 100%
Selmeston Crossing S.P.S, Selmeston
Storm discharge at pumping station
Company site name
SELMESTON CEO - 108884
EA ID / permit
SWS00764 · A01253
Outlet location
TQ5123007450 (OS grid reference) · View on Apple Maps
WFD catchment
Glynde Reach (GB107041012510)
2024 spills / hours
13 / 28
Long-term average
9.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 24 hours spilling →
Unnamed Trib of Glynde Reach 6 24 down 54% 97%
Barrows Brook Eastchurch Ceo
Storm discharge at pumping station
Company site name
BARROWS BROOK EASTCHURCH CEO - 108109
EA ID / permit
SWS00044 · A01335
Outlet location
TR0043072530 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES LOWER (GB530603911401)
Bathing water
Leysdown
Shellfish water
Outer Thames; Sheppey; Swale East; Swalecliffe
2024 spills / hours
17 / 89
Long-term average
14.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 24 hours spilling →
Barrows Brook 8 24 down 53% 100%
Fort Cumberland Stormwater Tanks
Storm discharge at pumping station
Company site name
FORT CUMBERLAND ROAD EASTNEY SSO - 110658
EA ID / permit
SWS00325 · A00753
Outlet location
SZ6858099290 (OS grid reference) · View on Apple Maps
WFD catchment
LANGSTONE HARBOUR (GB580705130000)
Bathing water
Beachlands Central; Beachlands West; Eastney; Southsea East
Shellfish water
Chichester Harbour (Emsworth Channel); Langstone Harbour; Portsmouth Harbour; Spithead and Stokes Bay
2024 spills / hours
13 / 44
Long-term average
7.6 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 24 hours spilling →
Langstone Harbour 9 24 down 31% 100%
St Margarets Terrace Rye Ceo
Storm discharge at pumping station
Company site name
ST MARGARETS TERRACE RYE CSO - 108342
EA ID / permit
SWS00814 · NPSWQD010087
Outlet location
TQ9192720122 (OS grid reference) · View on Apple Maps
WFD catchment
ROTHER (GB540704016100)
2024 spills / hours
38 / 105
Long-term average
53.2 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 23 hours spilling →
The River Tillingham 27 23 down 29% 100%
West Common Road Fawley Ceo
Overflow on sewer network
Company site name
PENN CRESCENT HAYWARDS HEATH OUTSIDE 31 CSO - 108309
EA ID / permit
SWS00920 · A01272
Outlet location
SU4444000990 (OS grid reference) · View on Apple Maps
WFD catchment
Dark Water (GB107042011330)
2024 spills / hours
28 / 85
Long-term average
16.3 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 23 hours spilling →
Dark Water 13 23 down 54% 100%
Lower Road Woodchurch CSO
Overflow on sewer network
Company site name
LOWER ROAD WOODCHURCH CSO - 109408
EA ID / permit
SWS00519 · A01437
Outlet location
TQ9471034710 (OS grid reference) · View on Apple Maps
WFD catchment
Cradlebridge Petty Sewer (GB107040019530)
2024 spills / hours
21 / 111
Long-term average
11.2 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 23 hours spilling →
Trib of Cradlebridge Petty Swr 7 23 down 67% 100%
School Lane PS
Storm discharge at pumping station
Company site name
SCHOOL LANE NUTBOURNE CEO - 108299
EA ID / permit
SWS00751 · A01069
Outlet location
SU7769005390 (OS grid reference) · View on Apple Maps
WFD catchment
CHICHESTER HARBOUR (GB580705210000)
Shellfish water
Chichester Harbour (Chichester Channel); Chichester Harbour (Emsworth Channel); Chichester Harbour (Thornham Channel)
2024 spills / hours
1 / 1.3
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 23 hours spilling →
Ham Brook 2 23 up 100% 100%
Fernhill Close Crawley Down
Overflow on sewer network
Company site name
FERNHILL CLOSE CRAWLEY DOWN OUTSIDE 10 CSO - 108289
EA ID / permit
SWS00307 · A01066
Outlet location
TQ3460038190 (OS grid reference) · View on Apple Maps
WFD catchment
Eden Brook (GB106040018660)
2024 spills / hours
– / –
Long-term average
4.0 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 23 hours spilling →
Trib Felbridge Wtr & R Medway 4 23 18%

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.