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
Kerves Lane Horsham Wps
Storm discharge at pumping station
Company site name
KERVES LANE HORSHAM CSO - 108321
EA ID / permit
SWS00471 · A01269
Outlet location
TQ1834029400 (OS grid reference) · View on Apple Maps
WFD catchment
R. Arun Source (GB107041012920)
2024 spills / hours
17 / 67
Long-term average
11.3 spills a year (monitored since 2017)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 49 hours spilling →
Horn Brook 7 49 down 59% 99%
Hurstwood Tunbridge Wells Ceo
Storm discharge at pumping station
Company site name
HURSTWOOD TUNBRIDGE WELLS CEO - 108661
EA ID / permit
SWS00002 · A00237
Outlet location
TQ5695040020 (OS grid reference) · View on Apple Maps
WFD catchment
Barden Mill Stream (GB106040018100)
2024 spills / hours
33 / 81
Long-term average
21.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 49 hours spilling →
Barden Mill Stream 16 49 down 52% 99%
Lawn Road/Osbourne Road
Overflow on sewer network
Company site name
LAWN ROAD SOUTHAMPTON CSO - 108450
EA ID / permit
SWS00497 · A00372
Outlet location
SU4309013520 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
4 / 1.3
Long-term average
3.3 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 49 hours spilling →
Itchen Estuary 11 49 up 175% 46%
Glebe Road Fernhurst CSO
Overflow on sewer network
Company site name
GLEBE ROAD FERNHURST CSO - 108077
EA ID / permit
SWS00349 · A00008
Outlet location
SU8976028220 (OS grid reference) · View on Apple Maps
WFD catchment
R. Lod (GB107041012830)
2024 spills / hours
16 / 44
Long-term average
16.7 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 48 hours spilling →
Trib of the R. Rother West 11 48 down 31% 97%
Bulwarks Sewage Pumping Station
Storm discharge at pumping station
Company site name
THE BULWARK SANDWICH CEO - 107367
EA ID / permit
SWS00122 · A00622
Outlet location
TR3355058150 (OS grid reference) · View on Apple Maps
WFD catchment
STOUR (KENT) (GB520704004700)
2024 spills / hours
7 / 3.9
Long-term average
11.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 48 hours spilling →
Tidal River Stour 20 48 up 186% 97%
Beaulieu Village PS
Storm discharge at pumping station
Company site name
FIRE STATION LANE BEAULIEU CEO - 108394
EA ID / permit
SWS00050 · W00215
Outlet location
SU3882002290 (OS grid reference) · View on Apple Maps
WFD catchment
BEAULIEU RIVER (GB520704201400)
Shellfish water
Beaulieu River; Lepe Middle Bank; Lymington and Sowley
2024 spills / hours
5 / 26
Long-term average
2.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 48 hours spilling →
Beaulieu River Estuary 6 48 up 20% 99%
Bolney Sewage Pumping Station
Storm discharge at pumping station
Company site name
CHAPEL ROAD BOLNEY CEO - 108202
EA ID / permit
SWS00079 · A00650
Outlet location
TQ2573021470 (OS grid reference) · View on Apple Maps
WFD catchment
Bolney Sewer (GB107041012250)
2024 spills / hours
14 / 76
Long-term average
8.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 47 hours spilling →
Freshwater River 6 47 down 57% 99%
Pound Road Bursledon Ceo
Storm discharge at pumping station
Company site name
POUND ROAD BURSLEDON CEO - 108878
EA ID / permit
SWS00675 · A01281
Outlet location
SU4724010000 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water; Approaches to Southampton Water
2024 spills / hours
95 / 438
Long-term average
22.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 47 hours spilling →
Unnamed Trib of River Itchen 6 47 down 94% 100%
Fareham Road Gosport Outside 359CSO
Overflow on sewer network
Company site name
FAREHAM ROAD GOSPORT OUTSIDE 359 CSO - 108505
EA ID / permit
SWS00974 · H01635
Outlet location
SU5835004600 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Shellfish water
Portsmouth Harbour
2024 spills / hours
29 / 76
Long-term average
37.1 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 47 hours spilling →
Portsmouth Harbour 26 47 down 10% 100%
Empress Rd Denton Catch Chamb' CS0
Other storm discharge asset type
Company site name
EMPRESS ROAD DENTON CATCH CHAMBERS 1 CSO - 116097
EA ID / permit
SWS00287 · CASM.0006
Outlet location
TQ6642074330 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
20 / 44
Long-term average
17.1 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 47 hours spilling →
The Thames Estuary (Tidal) 21 47 up 5% 100%
Church Lane Botley Ceo
Storm discharge at pumping station
Company site name
CHURCH LANE BOTLEY CEO - 108413
EA ID / permit
SWS00180 · A01423
Outlet location
SU5144012650 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
2024 spills / hours
2 / 13
Long-term average
2.1 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 47 hours spilling →
River Hamble 5 47 up 150% 100%
Bexhill Down Tank CSO
Overflow on sewer network
Company site name
BEXHILL DOWN CSO - 107638
EA ID / permit
SWS00062 · A00743
Outlet location
TQ7375008040 (OS grid reference) · View on Apple Maps
WFD catchment
East Stream (GB107041012430)
Bathing water
Bexhill
2024 spills / hours
21 / 148
Long-term average
11.9 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 46 hours spilling →
Controlled Sea 6 46 down 71% 100%
Main Road Fishbourne CSO
Storm discharge at pumping station
Company site name
OLD PORTSMOUTH ROAD CSO - 111371
EA ID / permit
SWS00539 · NPSWQD000450
Outlet location
SU8348004690 (OS grid reference) · View on Apple Maps
WFD catchment
CHICHESTER HARBOUR (GB580705210000)
Shellfish water
Chichester Harbour (Chichester Channel)
2024 spills / hours
19 / 179
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 46 hours spilling →
Trib of Chichester Harbour 8 46 down 58% 100%
Galley Hill Bexhill Ceo
Storm discharge at pumping station
Company site name
GALLEY HILL BEXHILL CSO - 116162
EA ID / permit
SWS00342 · A00740
Outlet location
TQ7565007500 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Bexhill
2024 spills / hours
14 / 122
Long-term average
16.2 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 46 hours spilling →
English Channel 5 46 down 64% 100%
Mill Square Wootton CSO
Overflow on sewer network
Company site name
MILL SQUARE WOOTTON CSO - 110327
EA ID / permit
SWS00575 · A01285
Outlet location
SZ5471092010 (OS grid reference) · View on Apple Maps
WFD catchment
WOOTTON CREEK (GB520710101900)
Shellfish water
Cowes and Medina; Ryde
2024 spills / hours
50 / 230
Long-term average
21.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 45 hours spilling →
Wootton Creek 23 45 down 54% 100%
Berengrave/Chalky Bk Gillingham CS0
Overflow on sewer network
Company site name
BERENGRAVE CHALKY BANK ROAD GILLINGHAM CSO - 109038
EA ID / permit
SWS00057 · A01318
Outlet location
TQ8270067420 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
25 / 33
Long-term average
21.6 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 45 hours spilling →
River Medway 18 45 down 28% 95%
Westbere WwTW
Storm tank at sewage works
Sewage works
Westbere
Company site name
WESTBERE SSO - 115802
EA ID / permit
SWS00927 · W00541
Outlet location
TR2035060610 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between A2 and West Stourmouth (GB107040019743)
2024 spills / hours
35 / 355
Long-term average
29.1 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 45 hours spilling →
The Great Stour 7 45 down 80% 98%
Northgate Rochester CSO
Overflow on sewer network
Company site name
NORTHGATE ROCHESTER CSO - 108692
EA ID / permit
SWS00619 · A00946
Outlet location
TQ7479068490 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
68 / 112
Long-term average
19.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 44 hours spilling →
Tidal Estuary of River Medway 24 44 down 65% 99%
Lurgashall WwTW
Inlet overflow at sewage works
Sewage works
Lurgashall
Company site name
LURGASHALL SSO - 115872
EA ID / permit
SWS00528 · W00069
Outlet location
SU9390026710 (OS grid reference) · View on Apple Maps
WFD catchment
R. Lod (GB107041012830)
2024 spills / hours
18 / 165
Long-term average
8.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 44 hours spilling →
Tributary of River Lod 8 44 down 56% 100%
Coopers Green PS, Uckfield
Storm discharge at pumping station
Company site name
COOPERS GREEN CEO - 108210
EA ID / permit
SWS00201 · A01097
Outlet location
TQ4780023230 (OS grid reference) · View on Apple Maps
WFD catchment
Tributary of River Uck north of Uckfield (GB107041012700)
2024 spills / hours
28 / 91
Long-term average
13.8 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 44 hours spilling →
Freshwater River 14 44 down 50% 100%
Hoo Wwps
Storm discharge at pumping station
Company site name
HOO ST WERBURGH SSO - 115968
EA ID / permit
SWS00442 · A00852
Outlet location
TQ7925071660 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
27 / 257
Long-term average
10.0 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 43 hours spilling →
River Medway Estuary 11 43 down 59% 94%
Thorely Road Bouldner Ceo
Storm discharge at pumping station
Company site name
THORLEY ROAD BOULDNOR CEO - 110277
EA ID / permit
SWS00084 · A00222
Outlet location
SZ3604089560 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Colwell Bay; Totland Bay
Shellfish water
Lymington and Sowley; Pennington; Newtown; Yarmouth
2024 spills / hours
19 / 31
Long-term average
10.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 43 hours spilling →
Trib of Thorely Brook 13 43 down 32% 100%
Pump Lane Gillingham Tank CSO
Overflow on sewer network
Company site name
PUMP LANE GILLINGHAM TANK CSO - 102333
EA ID / permit
SWS00684 · A00466
Outlet location
TQ8138067930 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
14 / 20
Long-term average
16.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 42 hours spilling →
River Medway Estuary 15 42 up 7% 100%
South Ashford P.S.
Storm discharge at pumping station
Company site name
SOUTH STOUR AVENUE SOUTH ASHFORD CEO - 108731
EA ID / permit
SWS00789 · K01509
Outlet location
TR0128041940 (OS grid reference) · View on Apple Maps
WFD catchment
East Stour (GB107040019640)
2024 spills / hours
51 / 436
Long-term average
21.8 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 42 hours spilling →
Freshwater River 7 42 down 86% 100%
Hamblewood Botley CSO
Overflow on sewer network
Company site name
HAMBLEWOOD BOTLEY CSO - 108845
EA ID / permit
SWS00395 · A01364
Outlet location
SU5151012970 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
2024 spills / hours
7 / 7.0
Long-term average
9.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 42 hours spilling →
River Hamble 13 42 up 86% 100%
Canterbury Wastewater Treatment Wks
Storm tank at sewage works
Sewage works
Canterbury Wastewater Treatment Wks
Company site name
CANTERBURY SSO - 115781
EA ID / permit
SWS00139 · W00532
Outlet location
TR1663059880 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between A2 and West Stourmouth (GB107040019743)
2024 spills / hours
20 / 202
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 42 hours spilling →
River Great Stour 7 42 down 65% 100%
Rumbolds Lane Haywards Heath Ceo
Storm discharge at pumping station
Company site name
RUMBOLDS LANE HAYWARDS HEATH CSO - 108326
EA ID / permit
SWS00725 · NPSWQD003870
Outlet location
TQ3257022620 (OS grid reference) · View on Apple Maps
WFD catchment
R. Adur East (GB107041012220)
2024 spills / hours
10 / 68
Long-term average
11.3 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 42 hours spilling →
River Adur via SWS 13 42 up 30% 100%
Templars Way Chandlers Ford Ceo
Storm discharge at pumping station
Company site name
TEMPLARS WAY CHANDLERS FORD CEO - 108399
EA ID / permit
SWS00854 · A01283
Outlet location
SU4278019160 (OS grid reference) · View on Apple Maps
WFD catchment
Monks Brook (GB107042016310)
2024 spills / hours
9 / 69
Long-term average
5.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 41 hours spilling →
Monks Brook via Drain 6 41 down 33% 100%
Prince Consort Wps
Storm discharge at pumping station
Company site name
PRINCE CONSORT RYDE CEO - 108043
EA ID / permit
SWS00676 · A00768
Outlet location
SZ5903093450 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Ryde
Shellfish water
Cowes and Medina; Ryde; Spithead and Stokes Bay
2024 spills / hours
39 / 239
Long-term average
20.2 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 41 hours spilling →
The Solent 32 41 down 18% 100%
Uckfield Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Uckfield
Company site name
UCKFIELD SSO - 115857
EA ID / permit
SWS00892 · A00534
Outlet location
TQ4630020400 (OS grid reference) · View on Apple Maps
WFD catchment
Ridgewood Stream (GB107041012630)
2024 spills / hours
19 / 178
Long-term average
15.3 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 41 hours spilling →
The Ridgewood Stream 6 41 down 68% 98%
High Street Uckfield CSO
Overflow on sewer network
Company site name
HIGH STREET UCKFIELD CSO - 108371
EA ID / permit
SWS00431 · A01077
Outlet location
TQ4727020910 (OS grid reference) · View on Apple Maps
WFD catchment
River Uck at Uckfield (GB107041012660)
2024 spills / hours
26 / 30
Long-term average
35.7 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 40 hours spilling →
Freshwater River 16 40 down 38% 99%
South Street Ditchling CSO
Overflow on sewer network
Company site name
SOUTH STREET DITCHLING CSO - 109528
EA ID / permit
SWS00792 · A01256
Outlet location
TQ3254015060 (OS grid reference) · View on Apple Maps
WFD catchment
Herrings Stream (GB107041012150)
2024 spills / hours
1 / 2.0
Long-term average
17.0 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 40 hours spilling →
Unnamed Trib. Herrings Stream 18 40 up 1700% 48%
Bolney Wood Pumping Station Ceo
Storm discharge at pumping station
Company site name
BOLNEY WOOD HAILSHAM CEO - 108191
EA ID / permit
SWS00080 · W00475
Outlet location
TQ5826008370 (OS grid reference) · View on Apple Maps
WFD catchment
Pevensey Haven between Rickney and Pevensey (GB107041006670)
2024 spills / hours
33 / 166
Long-term average
24.3 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 40 hours spilling →
Freshwater River 17 40 down 48% 100%
Castle Terrace CSO (Hawkhurst)
Overflow on sewer network
Company site name
CASTLE TERRACE HAWKHURST CSO - 108597
EA ID / permit
SWS00147 · A00168
Outlet location
TQ7618031230 (OS grid reference) · View on Apple Maps
WFD catchment
Hexden Channel (GB107040019670)
2024 spills / hours
59 / 407
Long-term average
64.6 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 40 hours spilling →
Tributary of Hexden Channel 14 40 down 76% 100%
Market Hill Cowes CSO
Storm discharge at pumping station
Company site name
MARKET HILL COWES CSO - 109299
EA ID / permit
SWS00553 · A01301
Outlet location
SZ4970096290 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Cowes; Gurnard
Shellfish water
Central Solent; Cowes and Medina; Lepe Middle Bank; Stanswood Bay
2024 spills / hours
21 / 34
Long-term average
45.6 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
The River Medina 23 39 up 10% 100%
Ashurst Bridge Ceo
Storm discharge at pumping station
Company site name
ASHURST BRIDGE CEO - 108393
EA ID / permit
SWS00030 · A01304
Outlet location
SU3452012490 (OS grid reference) · View on Apple Maps
WFD catchment
Bartley Water (GB107042016730)
2024 spills / hours
25 / 280
Long-term average
8.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
Bartley Water 6 39 down 76% 100%
Kilndown S.T.W.
Inlet overflow at sewage works
Sewage works
Kilndown S T W
Company site name
KILNDOWN CSO - 116040
EA ID / permit
SWS00472 · A00005
Outlet location
TQ7070035050 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Rother from Robertsbridge to Iden (GB107040013640)
2024 spills / hours
13 / 94
Long-term average
25.0 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 39 hours spilling →
Chalybeate Spring 9 39 down 31% 100%
CSO at Station Road - Forest Row
Overflow on sewer network
Company site name
STATION ROAD FOREST ROW CSO - 108345
EA ID / permit
SWS00229 · A01033
Outlet location
TQ4285035160 (OS grid reference) · View on Apple Maps
WFD catchment
Medway at Weir Wood (GB106040018070)
2024 spills / hours
29 / 207
Long-term average
26.2 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 38 hours spilling →
River Medway 14 38 down 52% 49%
Thetis Wharf PS
Storm discharge at pumping station
Company site name
MEDINA ROAD COWES CEO - 108537
EA ID / permit
SWS00869 · A00638
Outlet location
SZ5000095750 (OS grid reference) · View on Apple Maps
WFD catchment
MEDINA (GB520710101600)
Bathing water
Cowes; Gurnard
Shellfish water
Central Solent; Cowes and Medina; Spithead and Stokes Bay; Stanswood Bay
2024 spills / hours
13 / 9.7
Long-term average
17.9 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 38 hours spilling →
Medina Estuary 48 38 up 269% 100%
Hurst Green WwTW
Storm tank at sewage works
Sewage works
Hurst Green
Company site name
HURST GREEN SSO - 115717
EA ID / permit
SWS00457 · A01218
Outlet location
TQ7267026230 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Rother from Robertsbridge to Iden (GB107040013640)
2024 spills / hours
7 / 75
Long-term average
12.7 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 37 hours spilling →
Tributary of River Rother 6 37 down 14% 100%
Hambledon Pumping Station
Storm discharge at pumping station
Company site name
PETWORTH ROAD HAMBLEDON CEO - 109386
EA ID / permit
SWS00393 · A01129
Outlet location
SU9596037510 (OS grid reference) · View on Apple Maps
WFD catchment
Loxwood Stm-Hambledon Trb (GB107041017980)
2024 spills / hours
8 / 63
Long-term average
4.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 37 hours spilling →
Unnamed Tributary River Arun 4 37 down 50% 100%
Elmhurst Road (Compass Point) CSO
Overflow on sewer network
Company site name
ELMHURST ROAD FAREHAM CSO - 108425
EA ID / permit
SWS00286 · A00333
Outlet location
SU5779005790 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Shellfish water
Portsmouth Harbour
2024 spills / hours
21 / 33
Long-term average
17.2 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 37 hours spilling →
Black Brook 19 37 down 10% 100%
Holden Corner Tunbridge Wells CSO
Overflow on sewer network
Company site name
HOLDEN CORNER TUNBRIDGE WELLS CSO - 108656
EA ID / permit
SWS00440 · K02126
Outlet location
TQ5743042230 (OS grid reference) · View on Apple Maps
WFD catchment
Barden Mill Stream (GB106040018100)
2024 spills / hours
30 / 35
Long-term average
20.9 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 37 hours spilling →
Barden Mill Stream 37 37 up 23% 100%
Newick WwTW
Inlet overflow at sewage works
Sewage works
Newick
Company site name
NEWICK CSO - 115996
EA ID / permit
SWS00601 · W00358
Outlet location
TQ4254022000 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Ouse (GB107041012710)
2024 spills / hours
28 / 201
Long-term average
17.9 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 36 hours spilling →
River Ouse 18 36 down 36% 100%
South Street Queenborough Ceo
Storm discharge at pumping station
Company site name
SOUTH STREET QUEENBOROUGH CEO - 108732
EA ID / permit
SWS00795 · A00261
Outlet location
TQ9077072140 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Bathing water
Sheerness
Shellfish water
Sheppey; Southend
2024 spills / hours
22 / 38
Long-term average
21.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 36 hours spilling →
The River Swale Estuary 19 36 down 14% 100%
Hook Park Wps
Storm discharge at pumping station
Company site name
HOOK PARK NO.2 CEO - 108444
EA ID / permit
SWS00444 · A01486
Outlet location
SU5023004010 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Bathing water
Hillhead
Shellfish water
Southampton Water; Central Solent; Stanswood Bay; Approaches to Southampton Water
2024 spills / hours
4 / 28
Long-term average
2.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 35 hours spilling →
Southampton Water 5 35 up 25% 100%
Punnetts Town Wps
Storm discharge at pumping station
Company site name
PUNNETTS TOWN CEO - 108320
EA ID / permit
SWS00686 · A01250
Outlet location
TQ6295020340 (OS grid reference) · View on Apple Maps
WFD catchment
Cuckmere from Warbleton to Lower Horsebridge (GB107041012390)
2024 spills / hours
21 / 109
Long-term average
18.8 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 35 hours spilling →
Trib of Warbleton Stream 12 35 down 43% 100%
Burwash Village WwTW
Storm tank at sewage works
Sewage works
Burwash Village
Company site name
BURWASH VILLAGE SSO - 115930
EA ID / permit
SWS00128 · W00122
Outlet location
TQ6853026050 (OS grid reference) · View on Apple Maps
WFD catchment
Rother between Witherenden Hill and Etchingham (GB107040013590)
2024 spills / hours
23 / 172
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 35 hours spilling →
Trib of the River Rother 8 35 down 65% 100%
Rye Road
Storm discharge at pumping station
Company site name
RYE FOREIGN CEO - 108328
EA ID / permit
SWS00728 · W00566
Outlet location
TQ9015022600 (OS grid reference) · View on Apple Maps
WFD catchment
Tillingham (GB107040013560)
2024 spills / hours
25 / 371
Long-term average
17.5 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 34 hours spilling →
Freshwater River 4 34 down 84% 100%
Grove Road Gosport Ceo
Storm discharge at pumping station
Company site name
GROVE ROAD GOSPORT CEO - 108833
EA ID / permit
SWS00374 · A01362
Outlet location
SU6099000960 (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
18 / 70
Long-term average
16.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing, 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 34 hours spilling →
Portsmouth Harbour 8 34 down 56% 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.