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
Seaside Road Hastings NO1 Ceo
Storm discharge at pumping station
Company site name
SEASIDE ROAD HASTINGS NO 1 SSO - 107639
EA ID / permit
SWS00756 · A00793
Outlet location
TQ7851008580 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Hastings Pelham Beach; St Leonards
2024 spills / hours
3 / 9.9
Long-term average
1.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.2 hours spilling →
English Channel 2 6.2 down 33% 100%
Berwick WwTW
Storm tank at sewage works
Sewage works
Berwick
Company site name
BERWICK SSO - 115848
EA ID / permit
SWS00058 · W00360
Outlet location
TQ5297006710 (OS grid reference) · View on Apple Maps
WFD catchment
Cuckmere from Alfriston to Arlington (GB107041012330)
2024 spills / hours
24 / 256
Long-term average
12.5 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 6.1 hours spilling →
River Cuckmere 4 6.1 down 83% 100%
Thornham WwTW
Inlet overflow at sewage works
Sewage works
Thornham
Company site name
THORNHAM FORMULA A CSO - 115370
EA ID / permit
SWS00870 · W00354
Outlet location
SU7582004730 (OS grid reference) · View on Apple Maps
WFD catchment
Great Deep (GB610070074000)
Shellfish water
Chichester Harbour (Chichester Channel); Chichester Harbour (Emsworth Channel); Chichester Harbour (Thornham Channel); Langstone Harbour
2024 spills / hours
5 / 28
Long-term average
3.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.9 hours spilling →
Chichester Hbr via Little Deep 4 5.9 down 20% 100%
Crawley Court Gravesend CSO
Overflow on sewer network
Company site name
CRAWLEY COURT GRAVESEND CSO - 115015
EA ID / permit
SWS00223 · D00074
Outlet location
TQ6457074480 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
28 / 13
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 5.9 hours spilling →
Thames Estuary 11 5.9 down 61% 100%
Abbeyfields Faversham CSO
Overflow on sewer network
Company site name
ABBEYFIELDS FAVERSHAM CSO - 108641
EA ID / permit
SWS00006 · A00920
Outlet location
TR0232062150 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central; Swale East; Swale Central; Swale East; Swale Central; Swale East; Swale Central; Swale East
2024 spills / hours
8 / 3.2
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 5.8 hours spilling →
Faversham Creek 12 5.8 up 50% 100%
Buckland East Tank
Overflow on sewer network
Company site name
LOWER ROAD DOVER CSO - 108908
EA ID / permit
SWS00118 · A00715
Outlet location
TR3003043020 (OS grid reference) · View on Apple Maps
WFD catchment
Dour from Kearsney to Dover (GB107040073310)
2024 spills / hours
17 / 171
Long-term average
7.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.8 hours spilling →
Freshwater River 8 5.8 down 53% 100%
Ardingly WwTW, Ardingly
Inlet overflow at sewage works
Sewage works
Ardingly Ardingly
Company site name
ARDINGLY CSO - 111045
EA ID / permit
SWS00022 · A01239
Outlet location
TQ3503028600 (OS grid reference) · View on Apple Maps
WFD catchment
Ouse from Ardingly Resevoir to Lindfield (GB107041012720)
2024 spills / hours
4 / 7.9
Long-term average
2.2 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.7 hours spilling →
Lywood Stream Trib. River Ouse 3 5.7 down 25% 98%
Dallaway Gdns E Grinstead CSO
Overflow on sewer network
Company site name
DALLAWAY GARDENS EAST GRINSTEAD CSO - 108319
EA ID / permit
SWS00243 · A01075
Outlet location
TQ3895037980 (OS grid reference) · View on Apple Maps
WFD catchment
Medway at Weir Wood (GB106040018070)
2024 spills / hours
10 / 6.5
Long-term average
10.9 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.7 hours spilling →
Unnamed Tributary of R Medway 4 5.7 down 60% 99%
Martyrs Field CSO
Overflow on sewer network
Company site name
MARTYRS FIELD ASHFORD CSO - 108681
EA ID / permit
SWS00559 · A00390
Outlet location
TR0160042850 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between Ashford and Wye (GB107040019741)
2024 spills / hours
9 / 77
Long-term average
6.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.6 hours spilling →
The East Stour 4 5.6 down 56% 100%
Second Avenue No 2 CSO
Overflow on sewer network
Company site name
SECOND AVENUE CHATHAM NO 2 CSO - 108726
EA ID / permit
SWS00760 · A00934
Outlet location
TQ7562068140 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
16 / 12
Long-term average
12.9 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.6 hours spilling →
River Medway Estuary 11 5.6 down 31% 84%
Lower Twydall Lane Gillingham CSO
Overflow on sewer network
Company site name
LOWER TWYDALL LANE GILLINGHAM CSO - 101648
EA ID / permit
SWS00522 · A01320
Outlet location
TQ8146067890 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
6 / 38
Long-term average
18.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.6 hours spilling →
River Medway 15 5.6 up 150% 100%
CSO at Goddington Road Strood
Overflow on sewer network
Company site name
GODDINGTON ROAD STROOD CSO - 108638
EA ID / permit
SWS00228 · A00968
Outlet location
TQ7418069310 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
2 / 2.8
Long-term average
13.2 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.6 hours spilling →
The River Medway 13 5.6 up 550% 80%
Rock-A-Nore Ceo
Storm discharge at pumping station
Company site name
ROCK A NORE HASTINGS CEO - 110200
EA ID / permit
SWS00714 · A00693
Outlet location
TQ8304009540 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Hastings Pelham Beach; St Leonards
2024 spills / hours
1 / 4.4
Long-term average
4.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.6 hours spilling →
English Channel 2 5.6 up 100% 100%
Westcliff Pumping Station
Storm discharge at pumping station
Company site name
SPENCER SQUARE RAMSGATE CSO - 116124
EA ID / permit
SWS00929 · A00636
Outlet location
TR3787063760 (OS grid reference) · View on Apple Maps
WFD catchment
Kent North (GB650704510000)
Bathing water
Ramsgate Western Undercliffe; Ramsgate Sands
2024 spills / hours
0 / 0.0
Long-term average
1.8 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 5.5 hours spilling →
Controlled Sea 2 5.5 up from 0 98%
Boarley Lane Penenden Heath Ceo
Storm discharge at pumping station
Company site name
BOARLEY LANE PENENDEN HEATH CEO - 108587
EA ID / permit
SWS00074 · A00632
Outlet location
TQ7546058300 (OS grid reference) · View on Apple Maps
WFD catchment
Medway at Maidstone (GB106040018440)
2024 spills / hours
19 / 95
Long-term average
12.5 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.3 hours spilling →
Freshwater River 5 5.3 down 74% 100%
Commercial Road/Rudmore Road CSO
Overflow on sewer network
Company site name
MILE END ROAD PORTSMOUTH NO 1 CSO - 108415
EA ID / permit
SWS00194 · A00971
Outlet location
SU6393001850 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Portsmouth Harbour; Spithead and Stokes Bay
2024 spills / hours
7 / 17
Long-term average
6.6 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 5.2 hours spilling →
Portsmouth Harbour 4 5.2 down 43% 100%
Coombs Hastings Ceo
Storm discharge at pumping station
Company site name
COOMBS HASTINGS CEO - 110211
EA ID / permit
SWS00200 · A00692
Outlet location
TQ8049008850 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Hastings Pelham Beach; St Leonards
2024 spills / hours
16 / 86
Long-term average
8.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.1 hours spilling →
The English Channel 3 5.1 down 81% 100%
School Green CSO, Freshwater, Iow
Overflow on sewer network
Company site name
SCHOOL GREEN ROAD FRESHWATER OUTSIDE 33 CSO - 108554
EA ID / permit
SWS00747 · W00184
Outlet location
SZ3378087260 (OS grid reference) · View on Apple Maps
WFD catchment
WESTERN YAR (GB520710101800)
Shellfish water
Pennington; Yarmouth
2024 spills / hours
8 / 12
Long-term average
3.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 5.0 hours spilling →
Western Yar 6 5.0 down 25% 100%
Widley Road Portsmouth CSO
Overflow on sewer network
Company site name
WIDLEY ROAD PORTSMOUTH CSO - 108772
EA ID / permit
SWS00946 · A01279
Outlet location
SU6407002460 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Portsmouth Harbour; Spithead and Stokes Bay
2024 spills / hours
7 / 6.3
Long-term average
14.1 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 4.8 hours spilling →
Portsmouth Harbour 5 4.8 down 29% 100%
Cawte Road/Park Road CSO
Overflow on sewer network
Company site name
PARK ROAD SOUTHAMPTON CSO - 108467
EA ID / permit
SWS00149 · A00374
Outlet location
SU3935012200 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
18 / 49
Long-term average
13.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.8 hours spilling →
Test Estuary 10 4.8 down 44% 100%
Shide Path Newport No.1 CSO
Overflow on sewer network
Company site name
SHIDE PATH NEWPORT NO 1 CSO - 102553
EA ID / permit
SWS00768 · A00029
Outlet location
SZ5036088260 (OS grid reference) · View on Apple Maps
WFD catchment
R. Medina (GB107101005990)
Shellfish water
Cowes and Medina
2024 spills / hours
9 / 5.3
Long-term average
5.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.7 hours spilling →
River Medina 11 4.7 up 22% 100%
East St Sittingbourne CSO
Overflow on sewer network
Company site name
EAST STREET SITTINGBOURNE CSO - 108631
EA ID / permit
SWS00272 · A00441
Outlet location
TQ9111064060 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central
2024 spills / hours
3 / 1.6
Long-term average
7.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.7 hours spilling →
Non Tidal Trib of Milton Creek 8 4.7 up 167% 100%
Loop Street Wastewater PS
Storm discharge at pumping station
Company site name
LOOP STREET SANDWICH CEO - 108672
EA ID / permit
SWS00517 · A00799
Outlet location
TR3273058270 (OS grid reference) · View on Apple Maps
WFD catchment
STOUR (KENT) (GB520704004700)
2024 spills / hours
6 / 2.1
Long-term average
4.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.7 hours spilling →
Freshwater River 13 4.7 up 117% 100%
Gleave Close East Grinstead Ceo
Storm discharge at pumping station
Company site name
GLEAVE CLOSE EAST GRINSTEAD CEO - 108237
EA ID / permit
SWS00348 · A01429
Outlet location
TQ4024038930 (OS grid reference) · View on Apple Maps
WFD catchment
Shovelstrode Stream (GB106040018080)
2024 spills / hours
0 / 0.0
Long-term average
1.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.6 hours spilling →
The Shovelstrode Stream 1 4.6 up from 0 100%
Cyprus Road Faversham CSO
Overflow on sewer network
Company site name
CYPRUS ROAD FAVERSHAM NO 3 CSO - 109603
EA ID / permit
SWS00242 · A00403
Outlet location
TR0233062130 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central; Swale East
2024 spills / hours
1 / 0.1
Long-term average
5.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.6 hours spilling →
Faversham Creek 9 4.6 up 800% 92%
Gaters Mill
Overflow on sewer network
Company site name
GATERS MILL MANSBRIDGE CSO - 100228
EA ID / permit
SWS00345 · W00298
Outlet location
SU4535015580 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (GB107042022580)
Shellfish water
Southampton Water
2024 spills / hours
3 / 9.0
Long-term average
2.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.6 hours spilling →
River Itchen 2 4.6 down 33% 100%
Bourne Bridge CSO
Overflow on sewer network
Company site name
BOURNE BRIDGE HADLOW CSO - 108589
EA ID / permit
SWS00085 · A00413
Outlet location
TQ6311049670 (OS grid reference) · View on Apple Maps
WFD catchment
Bourne (GB106040018210)
2024 spills / hours
19 / 114
Long-term average
11.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.5 hours spilling →
River Bourne 5 4.5 down 74% 100%
Lake Green Road
Overflow on sewer network
Company site name
LAKE GREEN ROAD SANDOWN CSO - 108532
EA ID / permit
SWS00486 · W00210
Outlet location
SZ5873083900 (OS grid reference) · View on Apple Maps
WFD catchment
Eastern Yar (Lower) (GB107101005971)
2024 spills / hours
11 / 12
Long-term average
6.9 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.5 hours spilling →
Tributary of River Yar 5 4.5 down 55% 58%
Charles Street Strood CSO
Overflow on sewer network
Company site name
CHARLES STREET STROOD CSO - 108601
EA ID / permit
SWS00163 · A00938
Outlet location
TQ7359069030 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
1 / 0.3
Long-term average
2.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.5 hours spilling →
Medway Estuary 6 4.5 up 500% 95%
Deringwood Drive Maidstone Ceo
Storm discharge at pumping station
Company site name
DERINGWOOD DRIVE MAIDSTONE CEO - 109380
EA ID / permit
SWS00248 · A01156
Outlet location
TQ7875054550 (OS grid reference) · View on Apple Maps
WFD catchment
Len (GB106040018430)
2024 spills / hours
0 / 0.0
Long-term average
0.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.5 hours spilling →
The River Len 1 4.5 up from 0 100%
Deal Pumping Station
Storm discharge at pumping station
Company site name
GOLF ROAD DEAL CSO - 110209
EA ID / permit
SWS00246 · A00660
Outlet location
TR3815054600 (OS grid reference) · View on Apple Maps
WFD catchment
Kent South (GB640704540001)
Bathing water
Deal Castle
2024 spills / hours
0 / 0.0
Long-term average
1.6 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 4.4 hours spilling →
Freshwater River 3 4.4 up from 0 90%
Maida Road Chatham CSO
Overflow on sewer network
Company site name
MAIDA ROAD CHATHAM CSO - 108675
EA ID / permit
SWS00537 · A01319
Outlet location
TQ7562068130 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
3 / 0.5
Long-term average
3.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
River Medway 10 4.3 up 233% 99%
Rock Lane Pumping Station
Storm discharge at pumping station
Company site name
ROCK LANE HASTINGS CEO - 110363
EA ID / permit
SWS00713 · A01120
Outlet location
TQ8368012450 (OS grid reference) · View on Apple Maps
WFD catchment
Doleham Ditch (GB107040013380)
2024 spills / hours
3 / 1.6
Long-term average
3.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.3 hours spilling →
Freshwater River 4 4.3 up 33% 100%
Eddington Lane Wps
Storm discharge at pumping station
Company site name
EDDINGTON LANE HERNE BAY CSO - 108093
EA ID / permit
SWS00279 · A00031
Outlet location
TR1761066950 (OS grid reference) · View on Apple Maps
WFD catchment
Hogwell Sewer and Chislet North Stream (GB107040019770)
Bathing water
Herne Bay; Herne Bay Central
Shellfish water
Swale East; Swalecliffe; Margate
2024 spills / hours
6 / 9.2
Long-term average
4.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.2 hours spilling →
The Plenty Brook 4 4.2 down 33% 100%
Cliffs End Outfall
Storm discharge at pumping station
Company site name
FOADS LANE RAMSGATE CEO - 108911
EA ID / permit
SWS00185 · A00102
Outlet location
TR3466063860 (OS grid reference) · View on Apple Maps
WFD catchment
Monkton and Minster Marshes (GB107040019621)
Bathing water
Ramsgate Western Undercliffe
2024 spills / hours
0 / 0.0
Long-term average
2.4 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 4.2 hours spilling →
Controlled Sea 1 4.2 up from 0 100%
South Street Newport CSO
Overflow on sewer network
Company site name
SOUTH STREET NEWPORT CSO - 108799
EA ID / permit
SWS00794 · A01138
Outlet location
SZ5022089040 (OS grid reference) · View on Apple Maps
WFD catchment
R. Medina (GB107101005990)
Shellfish water
Cowes and Medina
2024 spills / hours
57 / 39
Long-term average
19.2 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 4.1 hours spilling →
The River Medina 13 4.1 down 77% 97%
Great Preston Road CSO
Storm discharge at pumping station
Company site name
NICHOLSON ROAD RYDE CSO - 109304
EA ID / permit
SWS00365 · A00767
Outlet location
SZ5942091350 (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
9 / 26
Long-term average
9.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.6 hours spilling →
Monktonmead Brook 4 3.6 down 56% 99%
Clover Street Chatham CSO
Overflow on sewer network
Company site name
CLOVER STREET CHATHAM CSO - 108608
EA ID / permit
SWS00186 · A00926
Outlet location
TQ7564068150 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
10 / 3.6
Long-term average
23.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.6 hours spilling →
River Medway Estuary 11 3.6 up 10% 100%
Chichester WwTW
Storm tank at sewage works
Sewage works
Chichester
Company site name
CHICHESTER WTW 2 SSO - 115401
EA ID / permit
SWS00173 · W00137
Outlet location
SU8387003750 (OS grid reference) · View on Apple Maps
WFD catchment
CHICHESTER HARBOUR (GB580705210000)
Shellfish water
Chichester Harbour (Chichester Channel); Chichester Harbour (Thornham Channel)
2024 spills / hours
32 / 235
Long-term average
47.9 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 3.5 hours spilling →
Chichester Harbour 4 3.5 down 88% 98%
Court Road Wwps, Lewes
Storm discharge at pumping station
Company site name
COURT ROAD LEWES CEO - 110624
EA ID / permit
SWS00208 · A01212
Outlet location
TQ4200010110 (OS grid reference) · View on Apple Maps
WFD catchment
OUSE (GB540704104900)
2024 spills / hours
82 / 82
Long-term average
26.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.4 hours spilling →
The River Ouse 8 3.4 down 90% 99%
Watermill Lane Bexhill CSO
Overflow on sewer network
Company site name
WATERMILL LANE BEXHILL CSO - 108373
EA ID / permit
SWS00914 · W00433
Outlet location
TQ7372009740 (OS grid reference) · View on Apple Maps
WFD catchment
Combe Haven between Powdermill Str conf and Coast (GB107041012480)
2024 spills / hours
7 / 18
Long-term average
5.9 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.3 hours spilling →
Tributary of Combe Haven River 6 3.3 down 14% 99%
Ridham Avenue Kemsley Ceo
Storm discharge at pumping station
Company site name
RIDHAM AVENUE KEMSLEY CEO - 110184
EA ID / permit
SWS00707 · A06000
Outlet location
TQ9220066150 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central
2024 spills / hours
0 / 0.0
Long-term average
0.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.3 hours spilling →
Tributary of the River Swale 1 3.3 up from 0 100%
Cowstead Lane No 2 and 3 Outfalls
Overflow on sewer network
Company site name
BEECHINGS WAY GILLINGHAM NO 1 CSO - 101855
EA ID / permit
SWS00217 · A00136
Outlet location
TQ8139067910 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
14 / 86
Long-term average
10.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
The Medway Estuary 6 3.2 down 57% 100%
Queens Road Lee-on-the-Solent Ceo
Storm discharge at pumping station
Company site name
QUEENS RD LEE ON THE SOLENT CEO - 110196
EA ID / permit
SWS00691 · A01370
Outlet location
SZ5672099510 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Hillhead; Lee-on-Solent; Stokes Bay
Shellfish water
Central Solent; Cowes and Medina; Portsmouth Harbour; Ryde; Spithead and Stokes Bay
2024 spills / hours
3 / 4.6
Long-term average
2.2 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
The Solent 3 3.2 no change 100%
Field End Garden Ashford CSO
Overflow on sewer network
Company site name
FIELD END GARDEN ASHFORD OUTSIDE 7 CSO - 108804
EA ID / permit
SWS00310 · A01328
Outlet location
TR0305042440 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between Ashford and Wye (GB107040019741)
2024 spills / hours
17 / 189
Long-term average
10.1 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
A Trib of the River Stour 1 3.2 down 94% 52%
Pembury WwTW
Storm tank at sewage works
Sewage works
Pembury
Company site name
PEMBURY SSO - 115922
EA ID / permit
SWS00652 · W00527
Outlet location
TQ6433342591 (OS grid reference) · View on Apple Maps
WFD catchment
Tudeley Brook (GB106040018120)
2024 spills / hours
3 / 6.3
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 3.1 hours spilling →
The Tudely Brook 1 3.1 down 67% 100%
Dover and Folkestone Waste Water
Overflow on sewer network
Company site name
FOLKESTONE JUNCTION CSO - 108617
EA ID / permit
SWS00260 · A00661
Outlet location
TR2422035940 (OS grid reference) · View on Apple Maps
WFD catchment
Kent South (GB640704540001)
Bathing water
Folkestone
2024 spills / hours
3 / 1.6
Long-term average
1.4 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 3.1 hours spilling →
The English Channel 5 3.1 up 67% 100%
Chichester Road Bognor CSO
Overflow on sewer network
Company site name
CHICHESTER ROAD BOGNOR CSO - 103301
EA ID / permit
SWS00171 · A00482
Outlet location
SU9266000880 (OS grid reference) · View on Apple Maps
WFD catchment
Aldingbourne Rife (GB107041011980)
Bathing water
Bognor Regis (Aldwick); Bognor Regis East; Felpham; Middleton-on-sea
2024 spills / hours
4 / 6.8
Long-term average
4.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 3.1 hours spilling →
Bartons Lane Ditch Trib of Ald 1 3.1 down 75% 100%
Apse Heath PS
Storm discharge at pumping station
Company site name
NEWBARN FARM APSE HEATH CEO - 108510
EA ID / permit
SWS00020 · A00220
Outlet location
SZ5663083100 (OS grid reference) · View on Apple Maps
WFD catchment
Eastern Yar (Lower) (GB107101005971)
2024 spills / hours
5 / 11
Long-term average
14.3 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.0 hours spilling →
Unnamed Wc to Scotchells Brook 2 3.0 down 60% 100%
Chale PS
Storm discharge at pumping station
Company site name
CHALE STREET CHALE CEO - 108514
EA ID / permit
SWS00154 · A00223
Outlet location
SZ4822078520 (OS grid reference) · View on Apple Maps
WFD catchment
R. Medina (GB107101005990)
2024 spills / hours
5 / 11
Long-term average
3.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.0 hours spilling →
Unnamed Stream 1 3.0 down 80% 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.