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
Minster Iot WwTW
Storm tank at sewage works
Sewage works
Minster Iot
Company site name
MINSTER IOT SSO - 115734
EA ID / permit
SWS00582 · W00559
Outlet location
TR3083063190 (OS grid reference) · View on Apple Maps
WFD catchment
Monkton and Minster Marshes (GB107040019621)
2024 spills / hours
1 / 0.3
Long-term average
0.3 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The Tidal River Stour 0 0.0 down 100% 100%
Morestead WwTW
Storm tank at sewage works
Sewage works
Morestead
Company site name
MORESTEAD ROAD WINCHESTER SSO - 115740
EA ID / permit
SWS00585 · A00712
Outlet location
SU4958027990 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (GB107042022580)
2024 spills / hours
0 / 0.0
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
Groundwaters via 2 Infilt Syst 0 0.0 no change 100%
Mumby Road Gosport Wps/Ceo
Storm discharge at pumping station
Company site name
MUMBY ROAD GOSPORT CEO - 110231
EA ID / permit
SWS00589 · A00350
Outlet location
SU6214000040 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Central Solent; Portsmouth Harbour; Ryde; Spithead and Stokes Bay
2024 spills / hours
2 / 7.1
Long-term average
0.3 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Portsmouth Harbour 0 0.0 down 100% 99%
New Alresford WwTW
Storm tank at sewage works
Sewage works
New Alresford
Company site name
NEW ALRESFORD SSO - 115779
EA ID / permit
SWS00593 · W00227
Outlet location
SU5898030530 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (Cheriton Stream) (GB107042016670)
2024 spills / hours
4 / 29
Long-term average
2.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Groundwater 0 0.0 down 100% 98%
Noreen Avenue Sheerness CSO
Overflow on sewer network
Company site name
NOREEN AVENUE SHEERNESS CSO - 108809
EA ID / permit
SWS00607 · K02026
Outlet location
TQ9431072850 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES LOWER (GB530603911401)
Bathing water
Minster Leas; Sheerness
Shellfish water
Outer Thames; Sheppey; Southend
2024 spills / hours
2 / 3.3
Long-term average
1.3 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The Scrapsgate Drain 0 0.0 down 100% 67%
North Halling Wwps
Storm discharge at pumping station
Company site name
NORTH HALLING CEO - 108883
EA ID / permit
SWS00610 · A00126
Outlet location
TQ7046065590 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
0 / 0.0
Long-term average
0.3 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medway 0 0.0 no change 100%
North Salts Rear 52 CSO
Overflow on sewer network
Company site name
NORTH SALTS RYE REAR 52 CSO - 108215
EA ID / permit
SWS00613 · A01167
Outlet location
TQ9245020990 (OS grid reference) · View on Apple Maps
WFD catchment
ROTHER (GB540704016100)
2024 spills / hours
2 / 1.6
Long-term average
0.6 spills a year (monitored since 2017)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tidal River Rother 0 0.0 down 100% 46%
North Trade Road Battle CSO
Overflow on sewer network
Company site name
NORTH TRADE ROAD BATTLE CSO - 108294
EA ID / permit
SWS00614 · A01026
Outlet location
TQ7374016130 (OS grid reference) · View on Apple Maps
WFD catchment
Line (GB107040013540)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Jun
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Line 0 0.0 no change 56%
Northbridge Wastewater Pumping Stn
Storm discharge at pumping station
Company site name
NORTHBRIDGE CHIDDINGFOLD CEO - 108295
EA ID / permit
SWS00616 · A01130
Outlet location
SU9655036490 (OS grid reference) · View on Apple Maps
WFD catchment
Loxwood Stm-Hambledon Trb (GB107041017980)
2024 spills / hours
2 / 6.5
Long-term average
0.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Unnamed Tributary River Arun 0 0.0 down 100% 100%
Norton Green CSO
Storm discharge at pumping station
Company site name
NORTON GREEN CEO - 108543
EA ID / permit
SWS00620 · A00724
Outlet location
SZ3505088550 (OS grid reference) · View on Apple Maps
WFD catchment
WESTERN YAR (GB520710101800)
Bathing water
Colwell Bay; Totland Bay
Shellfish water
Lymington and Sowley; Pennington; Newtown; Yarmouth
2024 spills / hours
1 / 1.7
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
Red Creek 0 0.0 down 100% 100%
Old Forge Ticehurst CSO
Overflow on sewer network
Company site name
OLD FORGE TICEHURST CSO - 108301
EA ID / permit
SWS00626 · A00895
Outlet location
TQ6865030010 (OS grid reference) · View on Apple Maps
WFD catchment
Limden (GB107040013610)
2024 spills / hours
2 / 1.1
Long-term average
0.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tributary of the R. Limden 0 0.0 down 100% 99%
Ordnance Terrace Chatham CSO
Overflow on sewer network
Company site name
ORDNANCE TERRACE CHATHAM CSO - 108875
EA ID / permit
SWS00631 · A01464
Outlet location
TQ7562068130 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
1 / 0.2
Long-term average
1.6 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Medway Estuary 0 0.0 down 100% 24%
Oxenden Gardens Willingdon CSO
Overflow on sewer network
Company site name
OXENDEAN GARDENS WILLINGDON CSO - 108303
EA ID / permit
SWS00634 · S01989
Outlet location
TQ5891003600 (OS grid reference) · View on Apple Maps
WFD catchment
Langley Sewer at Eastbourne (GB107041006650)
2024 spills / hours
0 / 0.0
Long-term average
0.2 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Trib of Willingdon Upper Sewer 0 0.0 no change 85%
Padsole Lane Maidstone CSO
Overflow on sewer network
Company site name
PADSOLE LANE MAIDSTONE CSO - 108697
EA ID / permit
SWS00639 · A01435
Outlet location
TQ7635055620 (OS grid reference) · View on Apple Maps
WFD catchment
Len (GB106040018430)
2024 spills / hours
21 / 32
Long-term average
3.3 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Len 0 0.0 down 100% 9%
Paynes Bridge
Overflow on sewer network
Company site name
VINES CROSS ROAD HORAM CSO - 109053
EA ID / permit
SWS00648 · A01039
Outlet location
TQ5818017510 (OS grid reference) · View on Apple Maps
WFD catchment
Waldron Ghyll (GB107041012391)
2024 spills / hours
1 / 0.8
Long-term average
0.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Waldron Ghyll 0 0.0 down 100% 100%
Pevensey Bay Halt (NO2) Wwps
Storm discharge at pumping station
Company site name
WALLSEND ROAD PEVENSEY CEO - 108312
EA ID / permit
SWS00661 · A01073
Outlet location
TQ6506004670 (OS grid reference) · View on Apple Maps
WFD catchment
Pevensey Haven between Rickney and Pevensey (GB107041006670)
Bathing water
Pevensey Bay; Norman`s Bay
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Salt Haven Estuary 0 0.0 no change 100%
Plantation Road Gillingham CSO
Overflow on sewer network
Company site name
PLANTATION ROAD GILLINGHAM CSO - 101453
EA ID / permit
SWS00665 · A00141
Outlet location
TQ7943068880 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
0 / 0.0
Long-term average
0.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medway 0 0.0 no change 97%
Pollards Moor Cadnam Ceo
Storm discharge at pumping station
Company site name
POLLARDS MOOR CADNAM CEO - 108473
EA ID / permit
SWS00669 · A01305
Outlet location
SU3031014370 (OS grid reference) · View on Apple Maps
WFD catchment
Cadnam River (GB107042016380)
2024 spills / hours
0 / 0.0
Long-term average
0.3 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Pollards Moor Stream 0 0.0 no change 100%
Portobello Sewage Pumping Station
Storm discharge at pumping station
Company site name
PORTOBELLO BRIGHTON EMO - 111606
EA ID / permit
SWS00672 · A01242
Outlet location
TQ3915001080 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Saltdean; Rottingdean Beach
2024 spills / hours
4 / 14
Long-term average
4.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The English Channel 0 0.0 down 100% 100%
Priorsdean Crescent Havant CSO
Overflow on sewer network
Company site name
PRIORSDEAN CRESCENT HAVANT CSO - 108475
EA ID / permit
SWS00678 · A01016
Outlet location
SU7103007430 (OS grid reference) · View on Apple Maps
WFD catchment
Hermitage Stream (GB107042016370)
Shellfish water
Chichester Harbour (Emsworth Channel); Langstone Harbour; Portsmouth Harbour
2024 spills / hours
1 / 1.2
Long-term average
0.2 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Hermitage Stream 0 0.0 down 100% 100%
Pump Lane Gillingham No.2 CSO
Overflow on sewer network
Company site name
PUMP LANE GILLINGHAM NO 2 CSO - 107445
EA ID / permit
SWS00683 · A00468
Outlet location
TQ8139067910 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
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
River Medway Estuary 0 0.0 no change 100%
Pumping Station in Field Number
Storm discharge at pumping station
Company site name
SINGLETON RELIEF CEO - 108335
EA ID / permit
SWS00685 · W00322
Outlet location
SU8730012980 (OS grid reference) · View on Apple Maps
WFD catchment
R. Lavant (Sussex) (GB107041006520)
2024 spills / hours
146 / 3,206
Long-term average
58.8 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
River Lavant 0 0.0 down 100% 100%
Queenborough Road Queenborough Ceo
Storm discharge at pumping station
Company site name
QUEENBOROUGH ROAD QUEENBOROUGH CEO - 108710
EA ID / permit
SWS00689 · A01024
Outlet location
TQ9222072470 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Bathing water
Sheerness
Shellfish water
Sheppey; Southend
2024 spills / hours
1 / 1.4
Long-term average
1.8 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Ditch Trib of River Swale 0 0.0 down 100% 100%
Queens Road CSO (R/O Hedleys)
Overflow on sewer network
Company site name
CANTERBURY ROAD CEMETERY ASHFORD CSO - 108713
EA ID / permit
SWS00690 · A00913
Outlet location
TR0152043270 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between Ashford and Wye (GB107040019741)
2024 spills / hours
9 / 35
Long-term average
11.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
The Great Stour 0 0.0 down 100% 100%
Queens Road P.S.
Storm discharge at pumping station
Company site name
QUEENS ROAD NEW ROMNEY CEO - 108711
EA ID / permit
SWS00692 · A00258
Outlet location
TR0794024420 (OS grid reference) · View on Apple Maps
WFD catchment
Dengemarsh Sewer (GB107040013450)
Bathing water
Littlestone; St Mary's Bay (Kent)
2024 spills / hours
1 / 8.5
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
Queens Road Ditch 0 0.0 down 100% 100%
Ramblers Way Waterlooville Ceo
Storm discharge at pumping station
Company site name
RAMBLERS WAY WATERLOOVILLE CEO - 110201
EA ID / permit
SWS00694 · A01276
Outlet location
SU7006010030 (OS grid reference) · View on Apple Maps
WFD catchment
Hermitage Stream (GB107042016370)
Shellfish water
Langstone Harbour
2024 spills / hours
1 / 0.1
Long-term average
0.4 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Unnamed Trib of R. Wallington 0 0.0 down 100% 92%
Rampart Road PS
Storm discharge at pumping station
Company site name
RAMPART ROAD BITTERNE CEO - 108478
EA ID / permit
SWS00695 · A00209
Outlet location
SU4374013070 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
3 / 1.6
Long-term average
2.6 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Itchen Estuary 0 0.0 down 100% 100%
Ransley High Halden Wps
Storm discharge at pumping station
Company site name
RANSLEY HIGH HALDEN CEO - 108714
EA ID / permit
SWS00696 · A00965
Outlet location
TQ9042037630 (OS grid reference) · View on Apple Maps
WFD catchment
Tenterden Sewer (GB107040019540)
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
Unnamed Trib Tenterden Sewer 0 0.0 no change 100%
Redgate Mill Crowborough WwTW
Inlet overflow at sewage works
Sewage works
Redgate Mill Crowborough
Company site name
REDGATE MILL CROWBOROUGH CSO - 115999
EA ID / permit
SWS00700 · W00479
Outlet location
TQ5523032520 (OS grid reference) · View on Apple Maps
WFD catchment
Eridge Stream (GB106040018390)
2024 spills / hours
0 / 0.0
Long-term average
6.8 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Eridge Stream 0 0.0 no change 33%
Richmond Road Bexhill CSO
Overflow on sewer network
Company site name
RICHMOND ROAD BEXHILL CSO - 100198
EA ID / permit
SWS00705 · A00747
Outlet location
TQ7323006900 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Bexhill
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
The English Channel 0 0.0 no change 100%
Rochester Avenue Rochester CSO
Overflow on sewer network
Company site name
ROCHESTER AVENUE ROCHESTER CSO - 108720
EA ID / permit
SWS00712 · K02114
Outlet location
TQ7500068050 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
4 / 1.2
Long-term average
1.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Medway (Tidal) 0 0.0 down 100% 100%
Rotherfield Lane P.S.
Storm discharge at pumping station
Company site name
ROTHERFIELD LANE MAYFIELD CEO - 108325
EA ID / permit
SWS00722 · W00565
Outlet location
TQ5804027220 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Rother, Coggins Mill to Five Ashes (GB107040013490)
2024 spills / hours
4 / 15
Long-term average
2.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Freshwater River 0 0.0 down 100% 100%
Sandgate Road Seabrook Wps
Storm discharge at pumping station
Company site name
SANDGATE ROAD SEABROOK CEO - 108721
EA ID / permit
SWS00737 · D00055
Outlet location
TR1885034850 (OS grid reference) · View on Apple Maps
WFD catchment
Kent South (GB640704540001)
Bathing water
Hythe; Sandgate
2024 spills / hours
0 / 0.0
Long-term average
0.1 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Strait of Dover 0 0.0 no change 100%
Sandling Lane Maidstone CSO
Overflow on sewer network
Company site name
SANDLING ROAD MAIDSTONE 1 CSO - 108702
EA ID / permit
SWS00739 · A00916
Outlet location
TQ7552056570 (OS grid reference) · View on Apple Maps
WFD catchment
Medway at Maidstone (GB106040018440)
2024 spills / hours
0 / 0.0
Long-term average
1.4 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medway 0 0.0 no change 71%
Sandling Lane Maidstone CSO
Overflow on sewer network
Company site name
SANDLING ROAD MAIDSTONE 2 CSO - 114854
EA ID / permit
SWS00740 · A00916
Outlet location
TQ7552056570 (OS grid reference) · View on Apple Maps
WFD catchment
Medway at Maidstone (GB106040018440)
2024 spills / hours
2 / 0.5
Long-term average
2.0 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medway 0 0.0 down 100% 27%
Scaynes Hill WwTW
Inlet overflow at sewage works
Sewage works
Scaynes Hill
Company site name
SCAYNES HILL CSO - 116199
EA ID / permit
SWS00745 · W00008
Outlet location
TQ3791024640 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Ouse (GB107041012710)
2024 spills / hours
1 / 2.7
Long-term average
1.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Ouse 0 0.0 down 100% 100%
Sedlescombe Bridge Ceo
Storm discharge at pumping station
Company site name
SEDLESCOMBE BRIDGE CEO - 108333
EA ID / permit
SWS00762 · W00038
Outlet location
TQ7828017670 (OS grid reference) · View on Apple Maps
WFD catchment
Brede between Battle and Winchelsea (GB107040013550)
2024 spills / hours
0 / 0.0
Long-term average
1.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Brede 0 0.0 no change 100%
Shoreham WwTW
Inlet overflow at sewage works
Sewage works
Shoreham
Company site name
ALBION STREET PORTSLADE EMO - 110362
EA ID / permit
SWS00769 · A01105
Outlet location
TQ2410004230 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Shoreham Beach; Southwick
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2016)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Mar
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
English Channel 0 0.0 no change 87%
Shripney Road P.S.
Storm discharge at pumping station
Company site name
SHRIPNEY ROAD SOUTH BERSTED CEO - 107408
EA ID / permit
SWS00773 · A00305
Outlet location
SU9403000550 (OS grid reference) · View on Apple Maps
WFD catchment
Aldingbourne Rife (GB107041011980)
Bathing water
Bognor Regis (Aldwick); Bognor Regis East; Felpham
2024 spills / hours
3 / 27
Long-term average
2.2 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Freshwater River 0 0.0 down 100% 100%
Somerset Road Ashford CSO
Overflow on sewer network
Company site name
SOMERSET ROAD ASHFORD CSO - 108730
EA ID / permit
SWS00786 · A00911
Outlet location
TR0160042940 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between Ashford and Wye (GB107040019741)
2024 spills / hours
1 / 0.3
Long-term average
0.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Great Stour 0 0.0 down 100% 94%
Sompting Road CSO Opposite No 22
Overflow on sewer network
Company site name
SOMPTING ROAD WORTHING OUTSIDE 22 CSO - 108336
EA ID / permit
SWS00787 · A00962
Outlet location
TQ1592004050 (OS grid reference) · View on Apple Maps
WFD catchment
Teville Stream (GB107041011940)
Bathing water
Lancing, Beach Green; Worthing; Worthing Beach House
2024 spills / hours
3 / 2.1
Long-term average
4.4 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Unnamed Trib of Teville Stream 0 0.0 down 100% 100%
Spencer Road Ryde CSO
Overflow on sewer network
Company site name
SPENCER ROAD RYDE CSO - 102121
EA ID / permit
SWS00802 · A00761
Outlet location
SZ5852092990 (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
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The Solent 0 0.0 no change 100%
Spot Lane Bearsted Ceo
Storm discharge at pumping station
Company site name
SPOT LANE BEARSTED CEO - 108855
EA ID / permit
SWS00803 · A01504
Outlet location
TQ7917054560 (OS grid reference) · View on Apple Maps
WFD catchment
Len (GB106040018430)
2024 spills / hours
3 / 23
Long-term average
4.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The River Len 0 0.0 down 100% 96%
Spring Gardens PS
Storm discharge at pumping station
Company site name
SPRING GARDENS ALRESFORD CEO - 108484
EA ID / permit
SWS00804 · A00211
Outlet location
SU5788031620 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (Cheriton Stream) (GB107042016670)
2024 spills / hours
2 / 2.2
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
Ditch Trib of River Itchen 0 0.0 down 100% 100%
Springvale Wps CSO
Storm discharge at pumping station
Company site name
SPRING VALE CEO Pumped - 116281
EA ID / permit
SWS00806 · A00770
Outlet location
SZ6199092090 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Ryde; Seagrove; St Helens
Shellfish water
Ryde; Spithead and Stokes Bay; Cowes and Medina
2024 spills / hours
2 / 5.3
Long-term average
4.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The Solent 0 0.0 down 100% 100%
St Helens Duver PS
Storm discharge at pumping station
Company site name
THE DUVER ST HELENS CEO - 108561
EA ID / permit
SWS00809 · A00675
Outlet location
SZ6370789450 (OS grid reference) · View on Apple Maps
WFD catchment
EASTERN YAR (GB520710102000)
Bathing water
Bembridge; Seagrove; St Helens
Shellfish water
Ryde
2024 spills / hours
1 / 4.0
Long-term average
3.2 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
The Solent 0 0.0 down 100% 100%
St Matthews Square Gosport Ceo
Storm discharge at pumping station
Company site name
ST MATTHEWS SQUARE GOSPORT CEO - 108844
EA ID / permit
SWS00818 · A01454
Outlet location
SU6206000120 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Central Solent; Portsmouth Harbour; Ryde; Spithead and Stokes Bay
2024 spills / hours
0 / 0.0
Long-term average
0.2 spills a year (monitored since 2016)
Investigation
Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Portsmouth Harbour 0 0.0 no change 100%
Station Road
Overflow on sewer network
Company site name
STATION ROAD HAILSHAM CSO - 108346
EA ID / permit
SWS00825 · D01053
Outlet location
TQ5938008800 (OS grid reference) · View on Apple Maps
WFD catchment
Horse Eye Sewer (GB107041012420)
2024 spills / hours
0 / 0.0
Long-term average
0.1 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Freshwater River 0 0.0 no change 36%
Station Road Rustington Combined
Overflow on sewer network
Company site name
STATION ROAD RUSTINGTON CSO - 111809
EA ID / permit
SWS00828 · NPSWQD005091
Outlet location
TQ0649402934 (OS grid reference) · View on Apple Maps
WFD catchment
Black Ditch (GB107041012890)
Bathing water
Littlehampton
2024 spills / hours
– / –
Long-term average
0.7 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
A Culverted Watercourse 0 0.0 20%
Sturla Road Chatham CSO
Overflow on sewer network
Company site name
STURLA ROAD CHATHAM CSO - 108741
EA ID / permit
SWS00839 · A00935
Outlet location
TQ7563068150 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
1 / 0.6
Long-term average
8.1 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
River Medway Estuary 0 0.0 down 100% 88%

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.