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
Salterns Road Hill Head Wps
Storm discharge at pumping station
Company site name
SALTERNS ROAD HILL HEAD CEO - 108441
EA ID / permit
SWS00733 · Unpermitted
Outlet location
SU5451001890 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Hillhead; Lee-on-Solent
Shellfish water
Approaches to Southampton Water; Central Solent; Cowes and Medina; Spithead and Stokes Bay
2024 spills / hours
13 / 31
Long-term average
16.7 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 23 hours spilling →
The Solent 8 23 down 38% 100%
Magpie Hall Road Chatham Outside 33
Overflow on sewer network
Company site name
MAGPIE HALL ROAD CHATHAM OUTSIDE 33 CSO - 108674
EA ID / permit
SWS00535 · A00930
Outlet location
TQ7563068140 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
38 / 19
Long-term average
19.0 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 23 hours spilling →
River Medway Estuary 24 23 down 37% 79%
Singlewell Road Gravesend 123 CSO
Overflow on sewer network
Company site name
SINGLEWELL ROAD GRAVESEND OUTSIDE 132 CSO - 108728
EA ID / permit
SWS00776 · CASM.0031
Outlet location
TQ6481074520 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
5 / 1.3
Long-term average
1.9 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 22 hours spilling →
Tidal River Thames 3 22 down 40% 61%
Charcott Place Ceo
Storm discharge at pumping station
Company site name
CHARCOTT PLACE CEO - 108814
EA ID / permit
SWS00161 · A01410
Outlet location
TQ5237047390 (OS grid reference) · View on Apple Maps
WFD catchment
Bid Stream (GB106040018150)
2024 spills / hours
13 / 68
Long-term average
10.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 22 hours spilling →
Trib of Little Hawden Stream 8 22 down 38% 97%
Street End Lane Broad Oak Ceo
Storm discharge at pumping station
Company site name
STREET END LANE BROAD OAK CEO - 108194
EA ID / permit
SWS00102 · A00272
Outlet location
TQ6051023170 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Rother, Coggins Mill to Five Ashes (GB107040013490)
2024 spills / hours
20 / 60
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 22 hours spilling →
Tributary of River Rother 13 22 down 35% 97%
Castle Street Cowes CSO
Storm discharge at pumping station
Company site name
ALBANY ROAD EAST COWES CEO - 116071
EA ID / permit
SWS00146 · A02507
Outlet location
SZ5011095970 (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
8 / 27
Long-term average
24.1 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 22 hours spilling →
The Solent 40 22 up 400% 100%
Tonbridge WwTW
Inlet overflow at sewage works
Sewage works
Tonbridge
Company site name
TONBRIDGE CSO - 111336
EA ID / permit
SWS00876 · A00036
Outlet location
TQ5996046320 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Eden Confluence to Yalding (GB106040018182)
2024 spills / hours
3 / 19
Long-term average
1.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 22 hours spilling →
The Botany Stream 3 22 no change 100%
Hartfield Road CSO
Overflow on sewer network
Company site name
HARTFIELD ROAD BEXHILL CSO - 107691
EA ID / permit
SWS00401 · A00748
Outlet location
TQ7196006590 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Bexhill; Norman`s Bay
2024 spills / hours
31 / 131
Long-term average
24.1 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 22 hours spilling →
Controlled Sea 10 22 down 68% 100%
Brambletree Crescent Borstal Ceo
Storm discharge at pumping station
Company site name
BRAMBLETREE CRESCENT BORSTAL CEO - 108904
EA ID / permit
SWS00090 · A01511
Outlet location
TQ7264066950 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
9 / 12
Long-term average
9.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 21 hours spilling →
The River Medway Estuary 12 21 up 33% 100%
Ebdens Hill Hastings Ceo
Storm discharge at pumping station
Company site name
EBDENS HILL HASTINGS CEO - 110338
EA ID / permit
SWS00278 · A01406
Outlet location
TQ7980013570 (OS grid reference) · View on Apple Maps
WFD catchment
Tributary of the Brede at Westfield (GB107040013530)
2024 spills / hours
14 / 23
Long-term average
27.3 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 21 hours spilling →
A Trib of the Forge Stream 13 21 down 7% 100%
Bridgeways
Storm discharge at pumping station
Company site name
CURTISDEN GREEN GOUDHURST CEO - 108624
EA ID / permit
SWS00097 · K02061
Outlet location
TQ7278040150 (OS grid reference) · View on Apple Maps
WFD catchment
Lesser Teise (GB106040018260)
2024 spills / hours
20 / 55
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 21 hours spilling →
Freshwater River 6 21 down 70% 100%
The Point Bembridge New Ceo
Storm discharge at pumping station
Company site name
THE POINT BEMBRIDGE NEW CEO - 110194
EA ID / permit
SWS00055 · A00699
Outlet location
SZ6423088830 (OS grid reference) · View on Apple Maps
WFD catchment
EASTERN YAR (GB520710102000)
Bathing water
Bembridge; Seagrove; St Helens
Shellfish water
Ryde
2024 spills / hours
15 / 51
Long-term average
11.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 21 hours spilling →
The Solent 9 21 down 40% 100%
St Helens WwTW
Inlet overflow at sewage works
Sewage works
St Helens
Company site name
ST HELENS CSO - 115441
EA ID / permit
SWS00810 · A00198
Outlet location
SZ6255088320 (OS grid reference) · View on Apple Maps
WFD catchment
Eastern Yar (Lower) (GB107101005971)
Bathing water
Bembridge; Seagrove; St Helens
Shellfish water
Ryde
2024 spills / hours
31 / 58
Long-term average
27.1 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 20 hours spilling →
Tributary of the Eastern Yar 14 20 down 55% 100%
Cowstead Lane No 2 and 3 Outfalls
Overflow on sewer network
Company site name
BEECHINGS WAY GILLINGHAM NO 2 CSO - 101174
EA ID / permit
SWS00218 · A00136
Outlet location
TQ8139067910 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
10 / 30
Long-term average
15.7 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 20 hours spilling →
The Medway Estuary 19 20 up 90% 98%
Havenstreet PS
Storm discharge at pumping station
Company site name
MAIN ROAD HAVENSTREET CEO - 108525
EA ID / permit
SWS00406 · A00672
Outlet location
SZ5553090140 (OS grid reference) · View on Apple Maps
WFD catchment
Blackbridge Brook (GB107101006100)
Bathing water
Ryde
Shellfish water
Cowes and Medina; Ryde
2024 spills / hours
22 / 66
Long-term average
23.1 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 20 hours spilling →
Blackbridge Brook 6 20 down 73% 100%
Turvills Field PS/the Pier PS
Storm discharge at pumping station
Company site name
MADEIRA ROAD TOTLAND SSO - 115944
EA ID / permit
SWS00891 · A00670
Outlet location
SZ3207087550 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Colwell Bay; Totland Bay
Shellfish water
Pennington; Yarmouth
2024 spills / hours
22 / 79
Long-term average
13.1 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 20 hours spilling →
The Solent 6 20 down 73% 100%
Mile End Road CSO
Overflow on sewer network
Company site name
MILE END ROAD PORTSMOUTH NO 2 CSO - 108459
EA ID / permit
SWS00566 · A00973
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
21 / 28
Long-term average
28.9 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 20 hours spilling →
Portsmouth Harbour 18 20 down 14% 100%
Hospital Farm Harbledown Ceo
Storm discharge at pumping station
Company site name
HOSPITAL FARM HARBLEDOWN CEO - 108659
EA ID / permit
SWS00453 · A01334
Outlet location
TR1288057720 (OS grid reference) · View on Apple Maps
WFD catchment
Whitehall Dyke at Harbledown (GB107040019560)
2024 spills / hours
17 / 35
Long-term average
13.8 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 20 hours spilling →
A Trib of the Great Stour 11 20 down 35% 100%
Amberstone View CSO, Hailsham
Overflow on sewer network
Company site name
AMBERSTONE VIEW HAILSHAM NEW CSO - 110339
EA ID / permit
SWS00016 · A01179
Outlet location
TQ5940010941 (OS grid reference) · View on Apple Maps
WFD catchment
Hurst Haven at Hailsham (GB107041012500)
2024 spills / hours
0 / 0.0
Long-term average
10.4 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 20 hours spilling →
A Tributary of Hurst Haven 8 20 up from 0 100%
Green Crescent O/Flow
Storm discharge at pumping station
Company site name
GREEN CRESCENT GOSPORT CSO - 108436
EA ID / permit
SWS00366 · H01636
Outlet location
SU5854002230 (OS grid reference) · View on Apple Maps
WFD catchment
River Alver (GB107042011370)
Bathing water
Lee-on-Solent; Stokes Bay
Shellfish water
Portsmouth Harbour
2024 spills / hours
7 / 36
Long-term average
4.4 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 19 hours spilling →
Saline Estuary 2 19 down 71% 86%
Westfield WwTW
Inlet overflow at sewage works
Sewage works
Westfield
Company site name
WESTFIELD CSO - 116104
EA ID / permit
SWS00932 · W00504
Outlet location
TQ8205015360 (OS grid reference) · View on Apple Maps
WFD catchment
Doleham Ditch (GB107040013380)
2024 spills / hours
24 / 59
Long-term average
13.1 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 19 hours spilling →
Tributary of River Brede 11 19 down 54% 95%
Court Street Faversham CSO
Overflow on sewer network
Company site name
COURT STREET FAVERSHAM CSO - 108573
EA ID / permit
SWS00209 · A00402
Outlet location
TR0144061570 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central; Swale East
2024 spills / hours
32 / 25
Long-term average
28.1 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 19 hours spilling →
Faversham Creek 25 19 down 22% 79%
Marden Old Works Pumping Station
Storm discharge at pumping station
Company site name
SOVEREIGNS WAY MARDEN OLD WORKS CEO - 108679
EA ID / permit
SWS00547 · A00011
Outlet location
TQ7380044780 (OS grid reference) · View on Apple Maps
WFD catchment
Lesser Teise at Marden (GB106040018310)
2024 spills / hours
9 / 26
Long-term average
8.9 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 19 hours spilling →
Trib of the River Lesser Teise 3 19 down 67% 100%
Pevensey PS No 3 CSO
Storm discharge at pumping station
Company site name
MONTAGUE WAY WESTHAM CEO - 108314
EA ID / permit
SWS00662 · A01083
Outlet location
TQ6388004340 (OS grid reference) · View on Apple Maps
WFD catchment
Langley Sewer at Eastbourne (GB107041006650)
Bathing water
Pevensey Bay
2024 spills / hours
13 / 48
Long-term average
11.3 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 19 hours spilling →
Freshwater River 5 19 down 62% 100%
Hartlake Road Pumping Station
Storm discharge at pumping station
Company site name
HARTLAKE ROAD HADLOW CEO - 108897
EA ID / permit
SWS00404 · A00166
Outlet location
TQ6366047990 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Eden Confluence to Yalding (GB106040018182)
2024 spills / hours
11 / 38
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 19 hours spilling →
Tributary of River Medway 5 19 down 55% 97%
Abbey Road Steyning CSO
Overflow on sewer network
Company site name
ABBEY ROAD STEYNING CSO - 107379
EA ID / permit
SWS00005 · A00511
Outlet location
TQ1817011590 (OS grid reference) · View on Apple Maps
WFD catchment
Black Sewer (GB107041012040)
2024 spills / hours
26 / 66
Long-term average
22.8 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 19 hours spilling →
Tributary of River Adur 14 19 down 46% 100%
Norton Headworks Wps
Storm discharge at pumping station
Company site name
NORTON TRANSFER IOW INLET CEO - 108544
EA ID / permit
SWS00621 · A00846
Outlet location
SZ3425089990 (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
8 / 22
Long-term average
28.5 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 19 hours spilling →
The Solent 9 19 up 13% 100%
Winchelsea Road Rye B Ceo
Storm discharge at pumping station
Company site name
WINCHELSEA ROAD RYE B CEO - 111902
EA ID / permit
SWS00954 · NPSWQD010088
Outlet location
TQ9198019940 (OS grid reference) · View on Apple Maps
WFD catchment
ROTHER (GB540704016100)
2024 spills / hours
17 / 20
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 19 hours spilling →
River Tillingham 7 19 down 59% 100%
Arundel Drive Fareham CSO
Storm discharge at pumping station
Company site name
ARUNDEL DRIVE FAREHAM CSO - 108391
EA ID / permit
SWS00835 · H01139
Outlet location
SU5701006600 (OS grid reference) · View on Apple Maps
WFD catchment
R. Wallington (GB107042016360)
Shellfish water
Portsmouth Harbour
2024 spills / hours
9 / 17
Long-term average
14.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 19 hours spilling →
Trib of Portsmouth Harbour 14 19 up 56% 100%
Swalecliffe WwTW
Storm tank at sewage works
Sewage works
Swalecliffe
Company site name
SWALECLIFFE SSO - 115445
EA ID / permit
SWS00843 · A01102
Outlet location
TR1415069530 (OS grid reference) · View on Apple Maps
WFD catchment
Thames Coastal South (GB640604640000)
Bathing water
Herne Bay Central; Tankerton
Shellfish water
Swale East; Swalecliffe
2024 spills / hours
3 / 15
Long-term average
6.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 18 hours spilling →
The North Sea 4 18 up 33% 98%
Chidham Lane SPS Chidham
Storm discharge at pumping station
Company site name
CHIDHAM CEO - 108205
EA ID / permit
SWS00177 · A01248
Outlet location
SU7931004580 (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
12 / 86
Long-term average
4.6 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 18 hours spilling →
Ditch to Chichester Harbour 3 18 down 75% 100%
Broadstairs Headworks
Storm discharge at pumping station
Company site name
BROADSTAIRS CEO - 111905
EA ID / permit
SWS00105 · A01214
Outlet location
TR4335071210 (OS grid reference) · View on Apple Maps
WFD catchment
Kent North (GB650704510000)
Shellfish water
Margate
2024 spills / hours
16 / 13
Long-term average
12.8 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 18 hours spilling →
The English Channel 10 18 down 38% 100%
Portobello Sewage Pumping Station
Storm discharge at pumping station
Company site name
PORTOBELLO BRIGHTON CSO - 116012
EA ID / permit
SWS00671 · A01242
Outlet location
TQ3915001080 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Saltdean; Rottingdean Beach; Seaford
2024 spills / hours
46 / 483
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 18 hours spilling →
The English Channel 6 18 down 87% 100%
Sewage Drain, Smarden
Storm discharge at pumping station
Company site name
SMARDEN BELL CEO - 108886
EA ID / permit
SWS00765 · K02062
Outlet location
TQ8654042480 (OS grid reference) · View on Apple Maps
WFD catchment
Beult (GB106040018270)
2024 spills / hours
19 / 242
Long-term average
7.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 18 hours spilling →
Freshwater River 3 18 down 84% 100%
Newmans Bridge Southwick Ceo
Storm discharge at pumping station
Company site name
NEWMANS BRIDGE SOUTHWICK CEO - 108880
EA ID / permit
SWS00603 · A01308
Outlet location
SU6205008730 (OS grid reference) · View on Apple Maps
WFD catchment
Potwell Trib (GB107042016400)
Shellfish water
Portsmouth Harbour
2024 spills / hours
3 / 30
Long-term average
3.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 18 hours spilling →
River Wallington 3 18 no change 100%
Empress Rd Denton Catch Chamb' CS0
Overflow on sewer network
Company site name
EMPRESS ROAD DENTON CATCH CHAMBERS 2 CSO - 116098
EA ID / permit
SWS00288 · CASM.0006
Outlet location
TQ6642074330 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
18 / 75
Long-term average
7.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 17 hours spilling →
The Thames Estuary (Tidal) 8 17 down 56% 100%
Asten Fields Pumping Station
Storm discharge at pumping station
Company site name
ASTEN FIELDS BATTLE CEO - 108185
EA ID / permit
SWS00031 · A00271
Outlet location
TQ7425016000 (OS grid reference) · View on Apple Maps
WFD catchment
Powdermill Stream (GB107041012550)
2024 spills / hours
21 / 65
Long-term average
11.0 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 17 hours spilling →
Unnamed Trib Powdermill Stream 7 17 down 67% 97%
Thanet Road Ramsgate CSO
Overflow on sewer network
Company site name
THANET ROAD RAMSGATE CSO - 108650
EA ID / permit
SWS00957 · A00649
Outlet location
TR3907065240 (OS grid reference) · View on Apple Maps
WFD catchment
Kent North (GB650704510000)
Bathing water
Broadstairs, Stone Bay; Broadstairs, Viking Bay; Ramsgate Sands; Ramsgate Western Undercliffe
2024 spills / hours
1 / 0.9
Long-term average
1.3 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 17 hours spilling →
North Sea 6 17 up 500% 100%
Hawden Road Tonbridge CSO
Overflow on sewer network
Company site name
HAWDEN ROAD TONBRIDGE CSO - 108736
EA ID / permit
SWS00407 · A00454
Outlet location
TQ5879046740 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Eden Confluence to Yalding (GB106040018182)
2024 spills / hours
19 / 126
Long-term average
27.3 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 17 hours spilling →
Tributary of Hilden Brook 4 17 down 79% 19%
Milton Road Gravesend CSO
Overflow on sewer network
Company site name
MILTON ROAD GRAVESEND CSO - 108695
EA ID / permit
SWS00581 · CASM.0007
Outlet location
TQ6539074420 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
12 / 32
Long-term average
2.9 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 17 hours spilling →
Tidal River Thames 11 17 down 8% 50%
Pier Road Gillingham No.1 CSO
Overflow on sewer network
Company site name
PIER ROAD GILLINGHAM NO.1 CSO - 111895
EA ID / permit
SWS00744 · A01235
Outlet location
TQ7778069580 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
1 / 0.3
Long-term average
6.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 17 hours spilling →
Medway Estuary 5 17 up 400% 100%
Newgate Lane Wps Ceo
Storm discharge at pumping station
Company site name
NEWGATE LANE PEEL COMMON CEO - 108849
EA ID / permit
SWS00599 · A01227
Outlet location
SU5718002590 (OS grid reference) · View on Apple Maps
WFD catchment
River Alver (GB107042011370)
Bathing water
Hillhead; Lee-on-Solent
Shellfish water
Approaches to Southampton Water; Central Solent; Portsmouth Harbour; Spithead and Stokes Bay
2024 spills / hours
7 / 27
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 17 hours spilling →
Ditch to the River Alver 3 17 down 57% 100%
The Quay Newport Ceo
Storm discharge at pumping station
Company site name
THE QUAY NEWPORT CEO - 110676
EA ID / permit
SWS00865 · NPSWQD004720
Outlet location
SZ5013089370 (OS grid reference) · View on Apple Maps
WFD catchment
MEDINA (GB520710101600)
Shellfish water
Cowes and Medina
2024 spills / hours
16 / 67
Long-term average
12.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 16 hours spilling →
The River Medina 10 16 down 38% 100%
Hambleton Road Waterlooville CSO
Overflow on sewer network
Company site name
HAMBLEDON ROAD WATERLOOVILLE CSO - 108437
EA ID / permit
SWS00394 · W00305
Outlet location
SU6728010490 (OS grid reference) · View on Apple Maps
WFD catchment
Potwell Trib (GB107042016400)
2024 spills / hours
6 / 26
Long-term average
7.2 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 16 hours spilling →
The Potwell Tributary 2 16 down 67% 99%
Beechings Way Gillingham No 3 CSO
Overflow on sewer network
Company site name
BEECHINGS WAY GILLINGHAM NO 3 CSO - 100312
EA ID / permit
SWS00232 · A00943
Outlet location
TQ8146067890 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
25 / 10
Long-term average
14.0 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 16 hours spilling →
River Medway Estuary 20 16 down 20% 100%
Fordwich Road Sturry Ceo
Storm discharge at pumping station
Company site name
FORDWICH ROAD STURRY CEO - 111603
EA ID / permit
SWS00323 · NPSWQD000449
Outlet location
TR1765059880 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between A2 and West Stourmouth (GB107040019743)
2024 spills / hours
13 / 27
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 16 hours spilling →
Great Stour River 5 16 down 62% 100%
Castle Rd Allington PS+Storm Tk Ceo
Storm discharge at pumping station
Company site name
CASTLE ROAD ALLINGTON SSO - 115961
EA ID / permit
SWS00144 · A00654
Outlet location
TQ7459058120 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
26 / 88
Long-term average
8.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 16 hours spilling →
Medway Estuary 7 16 down 73% 100%
Lydd Road Pumping Station
Storm discharge at pumping station
Company site name
LYDD ROAD CAMBER CEO - 108279
EA ID / permit
SWS00530 · A00292
Outlet location
TQ9690018600 (OS grid reference) · View on Apple Maps
WFD catchment
Walland Marsh at East Guldeford (GB107040013420)
2024 spills / hours
18 / 153
Long-term average
12.9 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 16 hours spilling →
The Guldeford Sewer 5 16 down 72% 100%
Neville Street Tunbridge Wells CSO
Overflow on sewer network
Company site name
NEVILLE STREET TUNBRIDGE WELLS CSO - 107370
EA ID / permit
SWS00592 · A00458
Outlet location
TQ5737038450 (OS grid reference) · View on Apple Maps
WFD catchment
Grom (GB106040018400)
2024 spills / hours
20 / 43
Long-term average
18.8 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 16 hours spilling →
The River Grom 16 16 down 20% 100%
Orchard Street Gillingham CSO
Overflow on sewer network
Company site name
ORCHARD STREET GILLINGHAM CSO - 108694
EA ID / permit
SWS00630 · EPR/DB3796RK
Outlet location
TQ8270067420 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
61 / 61
Long-term average
25.6 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 16 hours spilling →
The Otterham Creek 9 16 down 85% 99%

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.