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
Grain WwTW
Inlet overflow at sewage works
Sewage works
Grain
Company site name
GRAIN CEO - 115411
EA ID / permit
SWS00360 · K02057
Outlet location
TQ8927076180 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
Bathing water
Sheerness
Shellfish water
Foulness; Outer Thames; Sheppey; Southend
2024 spills / hours
26 / 24
Long-term average
18.1 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 15 hours spilling →
The Medway Estuary 18 15 down 31% 99%
Lower Waites Lane, Fairlight, CSO1
Overflow on sewer network
Company site name
LOWER WAITES LANE FAIRLIGHT NO 1 CSO - 108276
EA ID / permit
SWS00523 · K02022
Outlet location
TQ8758011850 (OS grid reference) · View on Apple Maps
WFD catchment
Marsham and Pannel Sewers (GB107040013390)
2024 spills / hours
23 / 119
Long-term average
12.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 15 hours spilling →
Freshwater River 6 15 down 74% 100%
Ashlett Creek WwTW
Storm tank at sewage works
Sewage works
Ashlett Creek
Company site name
ASHLETT CREEK FAWLEY SSO - 115372
EA ID / permit
SWS00028 · A00797
Outlet location
SU4807003510 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Bathing water
Calshot
Shellfish water
Southampton Water; Approaches to Southampton Water; Central Solent; Cowes and Medina; Stanswood Bay
2024 spills / hours
32 / 516
Long-term average
20.8 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 15 hours spilling →
Southampton Water 2 15 down 94% 100%
Christchurch Road Asford CSO
Overflow on sewer network
Company site name
CHRISTCHURCH ROAD ASHFORD CSO - 107368
EA ID / permit
SWS00179 · A00388
Outlet location
TR0097041920 (OS grid reference) · View on Apple Maps
WFD catchment
East Stour (GB107040019640)
2024 spills / hours
24 / 39
Long-term average
13.7 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 15 hours spilling →
Trib of the Great Stour 13 15 down 46% 100%
Dover Place CSO, Ashford, Kent
Overflow on sewer network
Company site name
DOVER PLACE ASHFORD CSO - 108630
EA ID / permit
SWS00262 · A01152
Outlet location
TR0133042250 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Great Stour (GB107040019660)
2024 spills / hours
3 / 3.4
Long-term average
16.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 15 hours spilling →
The Great Stour 13 15 up 333% 100%
Imperial Road Mount Pleasant Ceo
Storm discharge at pumping station
Company site name
IMPERIAL ROAD MOUNT PLEASANT CEO - 111369
EA ID / permit
SWS00462 · A01390
Outlet location
SU4297013070 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
8 / 15
Long-term average
6.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 15 hours spilling →
River Itchen 7 15 down 13% 100%
Aldwick Avenue CSO
Overflow on sewer network
Company site name
ALDWICK AVENUE BOGNOR CSO - 103303
EA ID / permit
SWS00011 · A00735
Outlet location
SZ9178098420 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Bognor Regis (Aldwick); Bognor Regis East; Felpham; Pagham
2024 spills / hours
4 / 40
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 15 hours spilling →
Controlled Sea 4 15 no change 99%
Carlton Avenue Bognor CSO
Overflow on sewer network
Company site name
CARLTON AVENUE BOGNOR CSO - 102492
EA ID / permit
SWS00140 · A00732
Outlet location
SZ9048097920 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Bognor Regis (Aldwick); Bognor Regis East; Pagham
2024 spills / hours
0 / 0.0
Long-term average
1.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 15 hours spilling →
Controlled Sea English Channel 3 15 up from 0 100%
Brickwall Sewage Pumping Station
Storm discharge at pumping station
Company site name
BRICKWALL NORTHIAM CEO - 108192
EA ID / permit
SWS00093 · A00629
Outlet location
TQ8332024060 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Rother from Robertsbridge to Iden (GB107040013640)
2024 spills / hours
25 / 108
Long-term average
13.3 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 15 hours spilling →
Tributary of the River Rother 4 15 down 84% 100%
Windmill Hill Herstmonceux WwTW
Storm tank at sewage works
Sewage works
Windmill Hill Herstmonceux
Company site name
WINDMILL HILL HERSTMONCEUX SSO - 115782
EA ID / permit
SWS00955 · A01222
Outlet location
TQ6492012930 (OS grid reference) · View on Apple Maps
WFD catchment
Nunningham Stream (GB107041012610)
2024 spills / hours
22 / 206
Long-term average
5.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 15 hours spilling →
Nunningham Stream 3 15 down 86% 100%
Linton WwTW
Inlet overflow at sewage works
Sewage works
Linton
Company site name
LINTON CSO - 115991
EA ID / permit
SWS00508 · W00539
Outlet location
TQ7516049020 (OS grid reference) · View on Apple Maps
WFD catchment
Beult (GB106040018270)
2024 spills / hours
10 / 24
Long-term average
10.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 14 hours spilling →
Tributary of River Beult 8 14 down 20% 100%
Park Road CSO
Overflow on sewer network
Company site name
PARK ROAD RYDE CSO - 107331
EA ID / permit
SWS00643 · A00758
Outlet location
SZ5986092150 (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
2 / 8.3
Long-term average
2.2 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 14 hours spilling →
Monktonmead Brook 3 14 up 50% 100%
Chilbolton WwTW
Storm tank at sewage works
Sewage works
Chilbolton
Company site name
CHILBOLTON SSO - 115879
EA ID / permit
SWS00178 · W00246
Outlet location
SU3865039460 (OS grid reference) · View on Apple Maps
WFD catchment
R. Test (GB107042022750)
2024 spills / hours
17 / 175
Long-term average
8.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 14 hours spilling →
The River Test 2 14 down 88% 99%
Bell Lane Pumping Station
Storm discharge at pumping station
Company site name
BELL LANE UCKFIELD CEO - 108349
EA ID / permit
SWS00054 · A00568
Outlet location
TQ4689020840 (OS grid reference) · View on Apple Maps
WFD catchment
River Uck at Uckfield (GB107041012660)
2024 spills / hours
4 / 6.1
Long-term average
5.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 14 hours spilling →
Freshwater River 3 14 down 25% 100%
Peartree Lane Bexhill Ceo
Storm discharge at pumping station
Company site name
PEARTREE LANE BEXHILL CEO - 108306
EA ID / permit
SWS00649 · W00412
Outlet location
TQ7165008350 (OS grid reference) · View on Apple Maps
WFD catchment
East Stream (GB107041012430)
2024 spills / hours
20 / 143
Long-term average
25.1 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 14 hours spilling →
Trib of Picknill Green Stream 6 14 down 70% 100%
Bearsted Wastewater P S
Storm discharge at pumping station
Company site name
YEOMAN WAY BEARSTED CEO - 110664
EA ID / permit
SWS00049 · A00674
Outlet location
TQ7948054530 (OS grid reference) · View on Apple Maps
WFD catchment
Len (GB106040018430)
2024 spills / hours
11 / 19
Long-term average
10.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 14 hours spilling →
River Len 9 14 down 18% 100%
Lyndhurst Golf Club Ceo
Storm discharge at pumping station
Company site name
LYNDHURST GOLF CLUB CEO - 108893
EA ID / permit
SWS00533 · A01388
Outlet location
SU3084008670 (OS grid reference) · View on Apple Maps
WFD catchment
R. Beaulieu (GB107042016340)
2024 spills / hours
5 / 37
Long-term average
3.6 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 14 hours spilling →
Beaulieu River via A Stream 3 14 down 40% 100%
Hyde Allotments Shanklin
Overflow on sewer network
Company site name
HYDE DESTRUCTOR SHANKLIN CSO - 101097
EA ID / permit
SWS00459 · A00385
Outlet location
SZ5794081980 (OS grid reference) · View on Apple Maps
WFD catchment
Eastern Yar (Lower) (GB107101005971)
2024 spills / hours
24 / 53
Long-term average
11.0 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 14 hours spilling →
Unnamed Sm to Scotchells Brook 7 14 down 71% 91%
Morestead WwTW
Storm tank at sewage works
Sewage works
Morestead
Company site name
MORESTEAD ROAD WINCHESTER PUMPED SSO - 116368
EA ID / permit
SWS00983 · A00712
Outlet location
SU4867027890 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (GB107042022580)
2024 spills / hours
28 / 239
Long-term average
14.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 14 hours spilling →
Groundwaters via 2 Infilt Syst 7 14 down 75% 100%
Brewers Lane Gosport CSO
Overflow on sewer network
Company site name
BREWERS LANE GOSPORT CSO - 108840
EA ID / permit
SWS00092 · A01207
Outlet location
SU5947002990 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Shellfish water
Portsmouth Harbour
2024 spills / hours
0 / 0.0
Long-term average
1.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 14 hours spilling →
Frater Lake, Portsmouth Hbr 2 14 up from 0 100%
Becton Lane Barton on Sea Ceo
Storm discharge at pumping station
Company site name
BECTON LANE BARTON ON SEA CEO - 108766
EA ID / permit
SWS00053 · A01194
Outlet location
SZ2478092590 (OS grid reference) · View on Apple Maps
WFD catchment
Dorset / Hampshire (GB620705550000)
Bathing water
Christchurch Bay; Highcliffe; Milford-on-sea
2024 spills / hours
5 / 21
Long-term average
4.0 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 13 hours spilling →
English Channel 4 13 down 20% 100%
West Hythe WwTW
Storm discharge at pumping station
Company site name
RANGE ROAD HYTHE K SHORT CSO - 116112
EA ID / permit
SWS00924 · A01101
Outlet location
TR1584033540 (OS grid reference) · View on Apple Maps
WFD catchment
Kent South (GB640704540001)
Bathing water
Hythe; Sandgate
2024 spills / hours
17 / 51
Long-term average
16.0 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 13 hours spilling →
The English Channel 14 13 down 18% 100%
Millbrook Business Park CSO
Overflow on sewer network
Company site name
MAYNARDS MEAD CROWBOROUGH CSO - 103295
EA ID / permit
SWS00577 · A01029
Outlet location
TQ5368029790 (OS grid reference) · View on Apple Maps
WFD catchment
Tributary of upper Medway at Crowborough (GB106040013360)
2024 spills / hours
13 / 17
Long-term average
9.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 13 hours spilling →
Freshwater River 7 13 down 46% 100%
Heytesbury Pumping Station
Storm discharge at pumping station
Company site name
OFF FOREST ROAD NEWPORT CEO - 108526
EA ID / permit
SWS00421 · W00176
Outlet location
SZ4903089650 (OS grid reference) · View on Apple Maps
WFD catchment
Lukely Brook (GB107101006250)
Shellfish water
Cowes and Medina
2024 spills / hours
4 / 11
Long-term average
10.0 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 13 hours spilling →
Trib of the Gunville Stream 5 13 up 25% 100%
Abbey Road Faversham Ceo
Storm discharge at pumping station
Company site name
ABBEY ROAD FAVERSHAM CEO - 103283
EA ID / permit
SWS00004 · A01377
Outlet location
TR0233062130 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central
2024 spills / hours
7 / 11
Long-term average
14.1 spills a year (monitored since 2016)
Monitor below 90%
Comms failure / issue · Resolved - Dec
Investigation
UWWTR investigation ongoing
Improvement
Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 13 hours spilling →
Faversham Creek 7 13 no change 88%
Westwood Road CSO
Overflow on sewer network
Company site name
WESTWOOD ROAD RYDE CSO - 108566
EA ID / permit
SWS00937 · A01052
Outlet location
SZ5853092990 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Ryde; Seagrove; St Helens
Shellfish water
Cowes and Medina; Ryde; Spithead and Stokes Bay
2024 spills / hours
11 / 6.4
Long-term average
8.2 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 13 hours spilling →
The Solent 11 13 no change 63%
Horsebridge Pumping Station
Storm discharge at pumping station
Company site name
UPPER HORSEBRIDGE CEO - 111334
EA ID / permit
SWS00448 · S01450
Outlet location
TQ5827012500 (OS grid reference) · View on Apple Maps
WFD catchment
Cuckmere from Warbleton to Lower Horsebridge (GB107041012390)
2024 spills / hours
28 / 213
Long-term average
12.3 spills a year (monitored since 2017)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 13 hours spilling →
River Cuckmere 13 13 down 54% 100%
Redlands Lane Fareham CSO
Overflow on sewer network
Company site name
REDLANDS LANE FAREHAM CSO - 110326
EA ID / permit
SWS00702 · A01392
Outlet location
SU5709005640 (OS grid reference) · View on Apple Maps
WFD catchment
River Alver (GB107042011370)
Shellfish water
Portsmouth Harbour
2024 spills / hours
3 / 6.7
Long-term average
5.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 13 hours spilling →
Black Brook 5 13 up 67% 100%
Noahs Ark Lane PS
Storm discharge at pumping station
Company site name
NOAHS ARK LANE LINDFIELD CEO - 108290
EA ID / permit
SWS00606 · A01084
Outlet location
TQ3517025030 (OS grid reference) · View on Apple Maps
WFD catchment
Scrase Bridge Stream at Haywards Heath (GB107041012680)
2024 spills / hours
3 / 20
Long-term average
3.0 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 12 hours spilling →
Freshwater River 2 12 down 33% 100%
Cousley Wood Ceo
Storm discharge at pumping station
Company site name
COUSLEY WOOD CEO - 108213
EA ID / permit
SWS00210 · A00277
Outlet location
TQ6540033430 (OS grid reference) · View on Apple Maps
WFD catchment
Teise at Bewl (GB106040018500)
2024 spills / hours
9 / 25
Long-term average
9.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 12 hours spilling →
Trib of the River Medway 7 12 down 22% 100%
CSO at the Wharf PS South Ambersham
Storm discharge at pumping station
Company site name
THE WHARF MIDHURST CEO - 108361
EA ID / permit
SWS00230 · A01078
Outlet location
SU8899021400 (OS grid reference) · View on Apple Maps
WFD catchment
Western Rother (GB107041012810)
2024 spills / hours
1 / 7.7
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 12 hours spilling →
Freshwater River 3 12 up 200% 100%
Fareham Road Gosport O/S 68 CSO
Overflow on sewer network
Company site name
FAREHAM ROAD GOSPORT OUTSIDE 68 CSO - 108847
EA ID / permit
SWS00300 · A01361
Outlet location
SU5947002990 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Shellfish water
Portsmouth Harbour
2024 spills / hours
1 / 1.2
Long-term average
3.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 12 hours spilling →
Frater Lake 3 12 up 200% 100%
Woodside Wigmore CSO
Overflow on sewer network
Company site name
WOODSIDE WIGMORE CSO - 108761
EA ID / permit
SWS00966 · EPR/DB3796WZ
Outlet location
TQ8270067420 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
8 / 4.6
Long-term average
15.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 12 hours spilling →
The Otterham Creek 15 12 up 88% 100%
Dog Kennel Lane Sewer
Overflow on sewer network
Company site name
DOG KENNEL LANE CHARING CSO - 108629
EA ID / permit
SWS00257 · A00625
Outlet location
TQ9549048680 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Great Stour (GB107040019660)
2024 spills / hours
3 / 1.8
Long-term average
3.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 12 hours spilling →
Freshwater River 8 12 up 167% 100%
Mill Road West Chiltington CSO
Overflow on sewer network
Company site name
MILL ROAD WEST CHILTINGTON CSO - 111802
EA ID / permit
SWS00574 · A01509
Outlet location
TQ5080811793 (OS grid reference) · View on Apple Maps
WFD catchment
Glynde Reach (GB107041012510)
2024 spills / hours
16 / 73
Long-term average
10.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
Tributary of River Chilt 5 11 down 69% 100%
Stonebridge Road Wwps
Storm discharge at pumping station
Company site name
STONEBRIDGE ROAD BROOK K CEO - 111172
EA ID / permit
SWS00834 · A01473
Outlet location
TR0633044170 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between Ashford and Wye (GB107040019741)
2024 spills / hours
2 / 6.0
Long-term average
2.5 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
Tributary of the Great Stour 2 11 no change 100%
Chapel Street Petersfield CSO
Overflow on sewer network
Company site name
CHAPEL STREET PETERSFIELD CSO - 108409
EA ID / permit
SWS00159 · A00362
Outlet location
SU7459023380 (OS grid reference) · View on Apple Maps
WFD catchment
Western Rother (Upstream Petersfield) (GB107041012840)
2024 spills / hours
9 / 45
Long-term average
9.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
Unnamed Strm to Tilmore Brook 5 11 down 44% 100%
Castle Rd Allington PS+Storm Tk Ceo
Storm discharge at pumping station
Company site name
ALLINGTON STORM TANKS ALLINGTON CEO - 108574
EA ID / permit
SWS00143 · A00654
Outlet location
TQ7459058120 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
11 / 62
Long-term average
5.9 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
Medway Estuary 7 11 down 36% 100%
Brielle Way West Minster Ceo
Storm discharge at pumping station
Company site name
BRIELLE WAY WESTMINSTER CEO - 108810
EA ID / permit
SWS00098 · K02065
Outlet location
TQ9033073750 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
Bathing water
Sheerness
Shellfish water
Foulness; Outer Thames; Sheppey; Southend
2024 spills / hours
17 / 56
Long-term average
13.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
The River Medway (Tidal) 4 11 down 76% 100%
Bryant Road Strood
Overflow on sewer network
Company site name
BRYANT ROAD STROOD CSO - 108594
EA ID / permit
SWS00117 · A00939
Outlet location
TQ7359069030 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
1 / 0.2
Long-term average
7.5 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
Tidal River Medway 6 11 up 500% 92%
Foster Road Gosport Wps Ceo
Storm discharge at pumping station
Company site name
FOSTER ROAD GOSPORT CEO - 110703
EA ID / permit
SWS00327 · A01375
Outlet location
SZ6076099270 (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
6 / 19
Long-term average
7.7 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 11 hours spilling →
Workhouse Lake, Portsmouth Hbr 6 11 no change 100%
Station Road Liss CSO
Overflow on sewer network
Company site name
STATION ROAD LISS CSO - 108486
EA ID / permit
SWS00826 · A01270
Outlet location
SU7762027710 (OS grid reference) · View on Apple Maps
WFD catchment
Western Rother (Upstream Petersfield) (GB107041012840)
2024 spills / hours
6 / 22
Long-term average
4.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
River Rother 2 11 down 67% 100%
Ensign Park Hamble Ceo
Storm discharge at pumping station
Company site name
ENSIGN PARK HAMBLE CEO - 108831
EA ID / permit
SWS00291 · A01359
Outlet location
SU4717006490 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water; Approaches to Southampton Water; Stanswood Bay
2024 spills / hours
1 / 11
Long-term average
7.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
Southampton Water 3 11 up 200% 100%
Lingfield Hospital Pumping Station
Storm discharge at pumping station
Company site name
LINGFIELD HOSPITAL SCHOOL CEO - 108670
EA ID / permit
SWS00504 · A00252
Outlet location
TQ4054043750 (OS grid reference) · View on Apple Maps
WFD catchment
Eden Brook (GB106040018660)
2024 spills / hours
4 / 12
Long-term average
3.5 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
The River Eden 3 11 down 25% 100%
Penn Cresent Haywards Heath
Overflow on sewer network
Company site name
PENN CRESCENT HAYWARDS HEATH OUTSIDE 53 CSO - 108310
EA ID / permit
SWS00653 · A00957
Outlet location
TQ3426024510 (OS grid reference) · View on Apple Maps
WFD catchment
Scrase Bridge Stream at Haywards Heath (GB107041012680)
2024 spills / hours
1 / 0.8
Long-term average
2.8 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 11 hours spilling →
Tributary of the Scrase Stream 5 11 up 400% 85%
High Street Lymington CSO
Overflow on sewer network
Company site name
HIGH STREET LYMINGTON CSO - 101701
EA ID / permit
SWS00426 · A00360
Outlet location
SZ3279095650 (OS grid reference) · View on Apple Maps
WFD catchment
LYMINGTON (GB520704202100)
Shellfish water
Lymington and Sowley; Pennington
2024 spills / hours
36 / 36
Long-term average
24.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 11 hours spilling →
Lymington River 21 11 down 42% 100%
Onslow Drive Ferring Wps, Ferring
Storm discharge at pumping station
Company site name
ONSLOW DRIVE FERRING CEO - 108011
EA ID / permit
SWS00629 · A01404
Outlet location
TQ0906002990 (OS grid reference) · View on Apple Maps
WFD catchment
Arun (Lower) (GB107041073300)
Bathing water
Goring Beach
2024 spills / hours
5 / 22
Long-term average
1.1 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 11 hours spilling →
Ferring Rife 1 11 down 80% 100%
Broomcroft Road, Gillingham CSO
Overflow on sewer network
Company site name
ASQUITH ROAD WIGMORE CSO - 108577
EA ID / permit
SWS00113 · A00806
Outlet location
TQ8270067420 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
42 / 49
Long-term average
25.8 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Scheduled
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 10 hours spilling →
The Otterham Creek 9 10 down 79% 31%
Monkbretton Bridge Rye Wps
Storm discharge at pumping station
Company site name
MONKBRETTON BRIDGE RYE CEO - 108224
EA ID / permit
SWS00583 · K02056
Outlet location
TQ9249720622 (OS grid reference) · View on Apple Maps
WFD catchment
ROTHER (GB540704016100)
2024 spills / hours
27 / 18
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 10 hours spilling →
Rye Harbour (Tidal) 19 10 down 30% 100%
Tankerton Bay Outfall
Overflow on sewer network
Company site name
NORTHWOOD ROAD WHITSTABLE NO 1 CSO - 102252
EA ID / permit
SWS00846 · A00774
Outlet location
TR1156067390 (OS grid reference) · View on Apple Maps
WFD catchment
Whitstable Bay (GB640604290000)
Bathing water
Ventnor; West Beach, Whitstable
Shellfish water
Swale East; Swalecliffe
2024 spills / hours
7 / 5.0
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 10 hours spilling →
Controlled Sea 9 10 up 29% 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.