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
Tatt Yalding Ceo
Storm discharge at pumping station
Company site name
TATT YALDING CEO - 108744
EA ID / permit
SWS00851 · W00594
Outlet location
TQ6963050110 (OS grid reference) · View on Apple Maps
WFD catchment
Beult at Yalding (GB106040018140)
2024 spills / hours
37 / 574
Long-term average
19.9 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 153 hours spilling →
River Beult (Trib of Medway) 21 153 down 43% 100%
Eden Vale WwTW
Storm tank at sewage works
Sewage works
Eden Vale
Company site name
EDEN VALE EAST GRINSTEAD SSO - 115912
EA ID / permit
SWS00280 · W00520
Outlet location
TQ3925040340 (OS grid reference) · View on Apple Maps
WFD catchment
Eden Brook (GB106040018660)
2024 spills / hours
48 / 520
Long-term average
26.3 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 153 hours spilling →
The Eden Vale Stream 18 153 down 63% 100%
Guestling Green WwTW
Inlet overflow at sewage works
Sewage works
Guestling Green
Company site name
GUESTLING GREEN CSO - 115985
EA ID / permit
SWS00380 · W00529
Outlet location
TQ8591414238 (OS grid reference) · View on Apple Maps
WFD catchment
Marsham and Pannel Sewers (GB107040013390)
2024 spills / hours
86 / 550
Long-term average
52.8 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 152 hours spilling →
The Pannel Sewer 54 152 down 37% 100%
Lunsford Cross WwTW
Storm tank at sewage works
Sewage works
Lunsford Cross
Company site name
LUNSFORDS CROSS SSO - 115855
EA ID / permit
SWS00527 · W00380
Outlet location
TQ7159010700 (OS grid reference) · View on Apple Maps
WFD catchment
East Stream (GB107041012430)
2024 spills / hours
56 / 876
Long-term average
37.7 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 152 hours spilling →
Tributary of East Stream 22 152 down 61% 100%
Littlebrook Waldron Ceo
Storm discharge at pumping station
Company site name
LITTLEBROOK WALDRON CEO - 108274
EA ID / permit
SWS00512 · A00590
Outlet location
TQ5557019490 (OS grid reference) · View on Apple Maps
WFD catchment
Bull River from Foxhunt Green to Lower Horsebridge (GB107041012380)
2024 spills / hours
59 / 518
Long-term average
44.7 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 151 hours spilling →
Controlled Waters 31 151 down 47% 100%
Domewood Pumping Station
Storm discharge at pumping station
Company site name
COPTHORNE ROAD DOMEWOOD CEO - 107391
EA ID / permit
SWS00258 · A00813
Outlet location
TQ3503040110 (OS grid reference) · View on Apple Maps
WFD catchment
Eden Brook (GB106040018660)
2024 spills / hours
35 / 391
Long-term average
21.0 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 151 hours spilling →
Freshwater River 21 151 down 40% 99%
High Halden WTW
Inlet overflow at sewage works
Sewage works
High Halden
Company site name
HIGH HALDEN CEO - 115414
EA ID / permit
SWS00422 · Permit applied for
Outlet location
TQ8889037720 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Beult (GB106040018280)
2024 spills / hours
40 / 149
Long-term average
12.0 spills a year (monitored since 2023)
Monitor below 90%
No longer operational as an overflow - permit revoked or to be revoked · Overflow no longer spilling to environment - from Aug
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 149 hours spilling →
Tributary of River Beult 20 149 down 50% 45%
Tilsmore P.S., Heathfield
Storm discharge at pumping station
Company site name
TILSMORE CEO - 108364
EA ID / permit
SWS00874 · A00310
Outlet location
TQ5727021500 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Rother, Coggins Mill to Five Ashes (GB107040013490)
2024 spills / hours
50 / 330
Long-term average
43.2 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 148 hours spilling →
Freshwater River 27 148 down 46% 100%
Polegate Ceo
Storm discharge at pumping station
Company site name
LYNHOLM ROAD POLEGATE NO.2 SSO - 115316
EA ID / permit
SWS00666 · A01443B
Outlet location
TQ5928004510 (OS grid reference) · View on Apple Maps
WFD catchment
Langley Sewer at Eastbourne (GB107041006650)
2024 spills / hours
58 / 560
Long-term average
36.8 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 148 hours spilling →
Mill Ditch 27 148 down 53% 100%
Willingdon Ceo
Overflow on sewer network
Company site name
WILLINGDON NO 2 CEO - 108777
EA ID / permit
SWS00951 · A01442B
Outlet location
TQ5952003930 (OS grid reference) · View on Apple Maps
WFD catchment
Langley Sewer at Eastbourne (GB107041006650)
2024 spills / hours
56 / 462
Long-term average
38.6 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 146 hours spilling →
New Stream Ditch 31 146 down 45% 99%
Salterns Lane Bursledon Ceo
Storm discharge at pumping station
Company site name
SALTERNS LANE BURSLEDON CEO - 108879
EA ID / permit
SWS00730 · A01282
Outlet location
SU4819008660 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water; Approaches to Southampton Water
2024 spills / hours
58 / 356
Long-term average
38.6 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 145 hours spilling →
Badnam Creek 35 145 down 40% 100%
Fishbourne Weir CSO
Overflow on sewer network
Company site name
FISHBOURNE LANE RYDE CSO - 108520
EA ID / permit
SWS00312 · A01087
Outlet location
SZ5569093100 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Ryde
Shellfish water
Cowes and Medina; Ryde; Spithead and Stokes Bay
2024 spills / hours
80 / 518
Long-term average
22.4 spills a year (monitored since 2016)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 144 hours spilling →
The Solent 28 144 down 65% 77%
Stockbridge WwTW
Storm tank at sewage works
Sewage works
Stockbridge
Company site name
STOCKBRIDGE SSO - 115752
EA ID / permit
SWS00831 · W00241
Outlet location
SU3534034440 (OS grid reference) · View on Apple Maps
WFD catchment
R. Test (Middle) (GB107042022670)
2024 spills / hours
100 / 1,304
Long-term average
55.1 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 139 hours spilling →
The Marshcourt River 18 139 down 82% 99%
Hurstpierpoint Pumping Station
Storm discharge at pumping station
Company site name
CUCKFIELD ROAD HURSTPIERPOINT CEO - 108259
EA ID / permit
SWS00458 · A00575
Outlet location
TQ2774018120 (OS grid reference) · View on Apple Maps
WFD catchment
Herrings Stream (GB107041012150)
2024 spills / hours
40 / 157
Long-term average
25.0 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 139 hours spilling →
Freshwater River 27 139 down 33% 100%
Tangmere Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Tangmere
Company site name
TANGMERE SSO - 115777
EA ID / permit
SWS00845 · A01125
Outlet location
SU9172006490 (OS grid reference) · View on Apple Maps
WFD catchment
Aldingbourne Rife (GB107041011980)
Bathing water
Bognor Regis East; Felpham
2024 spills / hours
128 / 2,528
Long-term average
25.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 138 hours spilling →
Aldingbourne Rife 10 138 down 92% 100%
Fairlee Road Newport O/S 62 CSO
Overflow on sewer network
Company site name
FAIRLEE ROAD NEWPORT OUTSIDE 62 CSO - 108507
EA ID / permit
SWS00294 · NPSWQD003785
Outlet location
SZ5019089710 (OS grid reference) · View on Apple Maps
WFD catchment
MEDINA (GB520710101600)
Shellfish water
Cowes and Medina
2024 spills / hours
79 / 303
Long-term average
46.0 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 137 hours spilling →
Tributary of the River Medina 58 137 down 27% 100%
New Road Wootton Ceo
Storm discharge at pumping station
Company site name
NEW ROAD WOOTTON CEO - 108541
EA ID / permit
SWS00595 · W00211
Outlet location
SZ5473092100 (OS grid reference) · View on Apple Maps
WFD catchment
WOOTTON CREEK (GB520710101900)
Shellfish water
Cowes and Medina; Ryde
2024 spills / hours
45 / 218
Long-term average
43.5 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 133 hours spilling →
Wootton Creek 38 133 down 16% 100%
Hillway CSO (Hillway Wps)
Storm discharge at pumping station
Company site name
HILLWAY BEMBRIDGE CEO - 108529
EA ID / permit
SWS00436 · A00841
Outlet location
SZ6368086890 (OS grid reference) · View on Apple Maps
WFD catchment
Eastern Yar (Lower) (GB107101005971)
Bathing water
Bembridge; St Helens
Shellfish water
Ryde
2024 spills / hours
37 / 352
Long-term average
29.4 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 132 hours spilling →
Ditch Trib of River Yar 21 132 down 43% 100%
Gurnard PS
Storm discharge at pumping station
Company site name
MARSH ROAD GURNARD CEO - 107441
EA ID / permit
SWS00381 · A00729
Outlet location
SZ4746093520 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Cowes; Gurnard
Shellfish water
Cowes and Medina; Lepe Middle Bank; Lymington and Sowley; Newtown
2024 spills / hours
29 / 220
Long-term average
22.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 131 hours spilling →
The Solent 22 131 down 24% 100%
Staplecross WwTW, Gate Farm, Staple
Storm tank at sewage works
Sewage works
Staplecross Gate Farm Staple
Company site name
STAPLECROSS SSO - 115914
EA ID / permit
SWS00822 · A01199
Outlet location
TQ7939022220 (OS grid reference) · View on Apple Maps
WFD catchment
Tillingham (GB107040013560)
2024 spills / hours
52 / 439
Long-term average
31.6 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 130 hours spilling →
The River Tillingham 20 130 down 62% 100%
Steyning WwTW
Storm tank at sewage works
Sewage works
Steyning
Company site name
STEYNING SSO - 115442
EA ID / permit
SWS00830 · W00390
Outlet location
TQ1865011900 (OS grid reference) · View on Apple Maps
WFD catchment
Black Sewer (GB107041012040)
2024 spills / hours
39 / 600
Long-term average
28.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 130 hours spilling →
Black Sewer Trib of River Adur 17 130 down 56% 100%
Baldwins Hill Pumping Station
Storm discharge at pumping station
Company site name
FURZEFIELD ROAD BALDWINS HILL CEO - 108578
EA ID / permit
SWS00036 · A00239
Outlet location
TQ3905039890 (OS grid reference) · View on Apple Maps
WFD catchment
Eden Brook (GB106040018660)
2024 spills / hours
49 / 383
Long-term average
24.6 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 129 hours spilling →
Trib of the River Medway 25 129 down 49% 100%
Crouch Farm Mayfield WwTW
Storm tank at sewage works
Sewage works
Crouch Farm Mayfield
Company site name
CROUCH FARM MAYFIELD SSO - 115815
EA ID / permit
SWS00227 · W00521
Outlet location
TQ6077026700 (OS grid reference) · View on Apple Maps
WFD catchment
Coggins Mill Stream (GB107040013500)
2024 spills / hours
47 / 405
Long-term average
24.2 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 126 hours spilling →
The Coggins Mill Stream 23 126 down 51% 100%
Ocklye Crowborough CSO
Overflow on sewer network
Company site name
OCKLYE CROWBOROUGH CSO - 111367
EA ID / permit
SWS00965 · W00567
Outlet location
TQ5006031300 (OS grid reference) · View on Apple Maps
WFD catchment
Friars Gate Stream (GB106040018370)
2024 spills / hours
29 / 175
Long-term average
22.8 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 126 hours spilling →
The Herons Ghyll 28 126 down 3% 100%
Bidborough WwTW
Storm tank at sewage works
Sewage works
Bidborough
Company site name
BIDBOROUGH SSO - 115882
EA ID / permit
SWS00063 · A00602
Outlet location
TQ5609042370 (OS grid reference) · View on Apple Maps
WFD catchment
Barden Mill Stream (GB106040018100)
2024 spills / hours
74 / 668
Long-term average
29.2 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 126 hours spilling →
Barden Mill Stream 17 126 down 77% 100%
Staplefield WwTW
Inlet overflow at sewage works
Sewage works
Staplefield
Company site name
STAPLEFIELD CSO - 116128
EA ID / permit
SWS00823 · W00338
Outlet location
TQ2799027360 (OS grid reference) · View on Apple Maps
WFD catchment
Ouse from Slaugham to Ardingly Resevoir (GB107041012730)
2024 spills / hours
30 / 159
Long-term average
18.3 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 125 hours spilling →
The River Ouse 19 125 down 37% 100%
Storrington WwTW, Storrington
Storm tank at sewage works
Sewage works
Storrington Storrington
Company site name
STORRINGTON SSO - 115931
EA ID / permit
SWS00836 · A01171
Outlet location
TQ0752015430 (OS grid reference) · View on Apple Maps
WFD catchment
Stor (GB107041012100)
2024 spills / hours
45 / 569
Long-term average
31.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 125 hours spilling →
The River Stor 16 125 down 64% 100%
Freeks Lane Burgess Hill CSO
Overflow on sewer network
Company site name
FREEKS LANE BURGESS HILL CSO - 108229
EA ID / permit
SWS00333 · W00418
Outlet location
TQ3112020260 (OS grid reference) · View on Apple Maps
WFD catchment
R. Adur East (GB107041012220)
2024 spills / hours
21 / 108
Long-term average
21.3 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 123 hours spilling →
Freshwater River 30 123 up 43% 82%
Catsfield WwTW
Inlet overflow at sewage works
Sewage works
Catsfield
Company site name
CATSFIELD CSO - 115979
EA ID / permit
SWS00148 · W00336
Outlet location
TQ7161013380 (OS grid reference) · View on Apple Maps
WFD catchment
Watermill Stream (GB107041012540)
2024 spills / hours
74 / 743
Long-term average
47.2 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 123 hours spilling →
Trib of the River Pevensey 33 123 down 55% 96%
Meres Farm Mayfield WwTW
Inlet overflow at sewage works
Sewage works
Meres Farm Mayfield
Company site name
MERES FARM MAYFIELD CSO - 115993
EA ID / permit
SWS00564 · W00589
Outlet location
TQ5791025370 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Rother, Coggins Mill to Five Ashes (GB107040013490)
2024 spills / hours
43 / 374
Long-term average
33.7 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 123 hours spilling →
River Rother 30 123 down 30% 100%
Ardingly WwTW
Storm tank at sewage works
Sewage works
Ardingly
Company site name
ARDINGLY SSO - 115774
EA ID / permit
SWS00021 · A00190
Outlet location
TQ3503028600 (OS grid reference) · View on Apple Maps
WFD catchment
Ouse from Ardingly Resevoir to Lindfield (GB107041012720)
2024 spills / hours
36 / 375
Long-term average
41.0 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 122 hours spilling →
Lywood Stream 17 122 down 53% 98%
Gravesend WwTW
Storm tank at sewage works
Sewage works
Gravesend
Company site name
GRAVESEND NO.1 SSO - 115412
EA ID / permit
SWS00362 · CATM.2969
Outlet location
TQ6693074340 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
23 / 65
Long-term average
54.3 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 120 hours spilling →
Tidal River Thames 42 120 up 83% 100%
Marine Drive Sewage Pumping Station
Storm discharge at pumping station
Company site name
MARINE DRIVE BRIGHTON NO.2 CEO - 116036
EA ID / permit
SWS00551 · A01241
Outlet location
TQ3915001080 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Saltdean; Rottingdean Beach; Seaford
2024 spills / hours
56 / 188
Long-term average
49.9 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 120 hours spilling →
The English Channel 36 120 down 36% 100%
Thornham WwTW
Inlet overflow at sewage works
Sewage works
Thornham
Company site name
THORNHAM INLET CEO - 115371
EA ID / permit
SWS00871 · 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
6 / 52
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 119 hours spilling →
Chichester Hbr via Little Deep 12 119 up 100% 100%
Furnace Pond Ceo
Storm discharge at pumping station
Company site name
FURNACE POND CEO - 108888
EA ID / permit
SWS00339 · A01503
Outlet location
TQ6959041260 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Teise (GB106040018130)
2024 spills / hours
35 / 272
Long-term average
20.5 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 118 hours spilling →
A Trib of the River Teise 15 118 down 57% 100%
CSO East St/Avon Rd Littlehampton
Overflow on sewer network
Company site name
EAST STREET LITTLEHAMPTON CSO - 108004
EA ID / permit
SWS00234 · A00858
Outlet location
TQ0277001540 (OS grid reference) · View on Apple Maps
WFD catchment
ARUN (GB540704105000)
Bathing water
Littlehampton
2024 spills / hours
66 / 141
Long-term average
36.3 spills a year (monitored since 2023)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 118 hours spilling →
Tidal River Arun 39 118 down 41% 100%
Tenterden WwTW
Inlet overflow at sewage works
Sewage works
Tenterden
Company site name
TENTERDEN CSO - 116001
EA ID / permit
SWS00855 · A00199
Outlet location
TQ8663332642 (OS grid reference) · View on Apple Maps
WFD catchment
Newmill Channel downstream of A28 (GB107040013630)
2024 spills / hours
45 / 252
Long-term average
18.9 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 117 hours spilling →
Trib of Newmill Channel 37 117 down 18% 100%
Arundel Pumping Station
Storm discharge at pumping station
Company site name
FORD ROAD ARUNDEL CEO - 108002
EA ID / permit
SWS00023 · D00019
Outlet location
TQ0126006460 (OS grid reference) · View on Apple Maps
WFD catchment
ARUN (GB540704105000)
Bathing water
Littlehampton
2024 spills / hours
92 / 367
Long-term average
70.3 spills a year (monitored since 2019)
High-spill reason (company)
Data collection - Tidal / river inundation
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 115 hours spilling →
Tidal Waters of River Arun 93 115 up 1% 91%
School Green Road Freshwater Ceo
Storm discharge at pumping station
Company site name
SCHOOL GREEN ROAD FRESHWATER CEO - 108522
EA ID / permit
SWS00748 · A01302
Outlet location
SZ3417087110 (OS grid reference) · View on Apple Maps
WFD catchment
WESTERN YAR (GB520710101800)
Shellfish water
Pennington; Yarmouth
2024 spills / hours
37 / 139
Long-term average
22.4 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 115 hours spilling →
Western Yar 31 115 down 16% 100%
Maresfield WwTW
Storm tank at sewage works
Sewage works
Maresfield
Company site name
MARESFIELD SSO - 115778
EA ID / permit
SWS00548 · W00342
Outlet location
TQ4583022650 (OS grid reference) · View on Apple Maps
WFD catchment
Shortbridge Stream (GB107041012980)
2024 spills / hours
45 / 522
Long-term average
21.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 114 hours spilling →
Shortbridge Stream 13 114 down 71% 98%
Sellindge WwTW
Storm tank at sewage works
Sewage works
Sellindge
Company site name
SELLINDGE SSO - 115761
EA ID / permit
SWS00763 · A00533
Outlet location
TR0860938116 (OS grid reference) · View on Apple Maps
WFD catchment
East Stour (GB107040019640)
2024 spills / hours
48 / 646
Long-term average
26.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 114 hours spilling →
The East Stour River 17 114 down 65% 91%
Nutley WwTW
Storm tank at sewage works
Sewage works
Nutley
Company site name
NUTLEY SSO - 115724
EA ID / permit
SWS00625 · W00115
Outlet location
TQ4409028720 (OS grid reference) · View on Apple Maps
WFD catchment
Pippingford Brook (GB106040018360)
2024 spills / hours
32 / 217
Long-term average
25.8 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 111 hours spilling →
Pippingford Brook 18 111 down 44% 100%
Herne Bay WwTW
Storm tank at sewage works
Sewage works
Herne Bay
Company site name
MAY STREET HERNE BAY SSO - 115418
EA ID / permit
SWS00419 · A00643
Outlet location
TR2111067520 (OS grid reference) · View on Apple Maps
WFD catchment
Hogwell Sewer and Chislet North Stream (GB107040019770)
Bathing water
Herne Bay
Shellfish water
Margate; Swalecliffe
2024 spills / hours
34 / 411
Long-term average
20.0 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 111 hours spilling →
Hogwell Sewer & R.Great Stour 11 111 down 68% 98%
William Allen Lane CSO
Overflow on sewer network
Company site name
HAYLIND ROAD HAYWARDS HEATH CSO - 111829
EA ID / permit
SWS00948 · W00409
Outlet location
TQ3460824711 (OS grid reference) · View on Apple Maps
WFD catchment
Scrase Bridge Stream at Haywards Heath (GB107041012680)
2024 spills / hours
47 / 202
Long-term average
34.4 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 110 hours spilling →
Scrase Stream 32 110 down 32% 100%
Peasmarsh Wps
Storm discharge at pumping station
Company site name
PEASMARSH CEO - 108307
EA ID / permit
SWS00650 · A00298
Outlet location
TQ8924022740 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Rother from Robertsbridge to Iden (GB107040013640)
2024 spills / hours
50 / 435
Long-term average
40.5 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 110 hours spilling →
A Tributary of River Rother 23 110 down 54% 99%
Shoreham WwTW
Inlet overflow at sewage works
Sewage works
Shoreham
Company site name
SHOREHAM CSO - 115434
EA ID / permit
SWS00770 · A01105
Outlet location
TQ2410004230 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Hove; Shoreham Beach; Southwick
2024 spills / hours
63 / 290
Long-term average
49.0 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 110 hours spilling →
English Channel 39 110 down 38% 100%
Queenborough WwTW
Storm tank at sewage works
Sewage works
Queenborough
Company site name
QUEENBOROUGH SSO - 115430
EA ID / permit
SWS00688 · A00697
Outlet location
TQ9085069970 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Bathing water
Sheerness
Shellfish water
Sheppey; Southend
2024 spills / hours
53 / 619
Long-term average
41.2 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 108 hours spilling →
The Swale Estuary 18 108 down 66% 98%
Sittingbourne WwTW
Storm tank at sewage works
Sewage works
Sittingbourne
Company site name
SITTINGBOURNE SSO - 115437
EA ID / permit
SWS00779 · W00518
Outlet location
TQ9128064740 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central
2024 spills / hours
142 / 2,130
Long-term average
42.6 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 107 hours spilling →
The Milton Creek 19 107 down 87% 100%
Taylor Street, Southborough CSO
Overflow on sewer network
Company site name
TAYLOR STREET SOUTHBOROUGH CSO - 108745
EA ID / permit
SWS00852 · A00446
Outlet location
TQ5779041630 (OS grid reference) · View on Apple Maps
WFD catchment
Barden Mill Stream (GB106040018100)
2024 spills / hours
41 / 213
Long-term average
36.9 spills a year (monitored since 2018)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 107 hours spilling →
Unnamed Stream to River Medway 31 107 down 24% 99%
Brading Wastewater Pumping Station
Storm discharge at pumping station
Company site name
QUAY LANE BRADING CEO - 113676
EA ID / permit
SWS00088 · EPR/AB3094EJ
Outlet location
SZ6120087200 (OS grid reference) · View on Apple Maps
WFD catchment
Eastern Yar (Lower) (GB107101005971)
Bathing water
St Helens
Shellfish water
Ryde
2024 spills / hours
34 / 224
Long-term average
29.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 105 hours spilling →
River Yar (Or A Trib of R.Yar) 23 105 down 32% 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.