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
Strawlands Wwps
Storm discharge at pumping station
Company site name
STRAWLANDS PLUMPTON GREEN CEO - 108350
EA ID / permit
SWS00837 · A01142
Outlet location
TQ3641016940 (OS grid reference) · View on Apple Maps
WFD catchment
Bevern Stream (GB107041012570)
2024 spills / hours
22 / 158
Long-term average
16.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 76 hours spilling →
Unnamed Trib of Bevern Stream 10 76 down 55% 100%
Oxted WwTW
Inlet overflow at sewage works
Sewage works
Oxted
Company site name
OXTED CSO - 115422
EA ID / permit
SWS00636 · A00193
Outlet location
TQ3978050040 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Eden (GB106040018630)
2024 spills / hours
41 / 136
Long-term average
25.1 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 76 hours spilling →
The River Eden 27 76 down 34% 100%
Fishbourne Lane Fishbourne Iow Ceo
Storm discharge at pumping station
Company site name
FISHBOURNE LANE FISHBOURNE IOW CEO - 108519
EA ID / permit
SWS00311 · W00199
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
33 / 180
Long-term average
18.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 74 hours spilling →
Wootton Creek 18 74 down 45% 100%
Hilden Park Pumping Station
Storm discharge at pumping station
Company site name
HILDEN PARK ROAD HILDENBOROUGH CEO - 108655
EA ID / permit
SWS00434 · A00249
Outlet location
TQ5768647727 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Eden Confluence to Yalding (GB106040018182)
2024 spills / hours
44 / 226
Long-term average
41.4 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 74 hours spilling →
Tributary of the River Medway 19 74 down 57% 100%
Jarvis Brook CSO
Overflow on sewer network
Company site name
JARVIS BROOK CROWBOROUGH CSO - 103293
EA ID / permit
SWS00468 · K02099
Outlet location
TQ5348030130 (OS grid reference) · View on Apple Maps
WFD catchment
Tributary of upper Medway at Crowborough (GB106040013360)
2024 spills / hours
5 / 16
Long-term average
2.8 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 74 hours spilling →
Jarvis Brook 12 74 up 140% 100%
Ulcombe Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Ulcombe
Company site name
ULCOMBE SSO - 115825
EA ID / permit
SWS00893 · W00508
Outlet location
TQ8429048280 (OS grid reference) · View on Apple Maps
WFD catchment
Ulcombe Stream (GB106040018330)
2024 spills / hours
29 / 326
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 71 hours spilling →
Tributary of the River Beult 8 71 down 72% 99%
Whitegates Lane Wadhurst WwTW
Inlet overflow at sewage works
Sewage works
Whitegates Lane Wadhurst
Company site name
WHITEGATES LANE WADHURST CSO - 116050
EA ID / permit
SWS00938 · W00033
Outlet location
TQ6310034140 (OS grid reference) · View on Apple Maps
WFD catchment
Bartley Mill Stream (GB106040018240)
2024 spills / hours
32 / 104
Long-term average
22.1 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 71 hours spilling →
Trib of River Teise 22 71 down 31% 99%
Town Row Rotherfield No 2 CSO
Overflow on sewer network
Company site name
TOWN ROW ROTHERFIELD NO 2 CSO - 108368
EA ID / permit
SWS00883 · K01526
Outlet location
TQ5659030180 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Eridge Stream (GB106040013370)
2024 spills / hours
12 / 55
Long-term average
15.5 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Dec
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 70 hours spilling →
Trib of the Eridge Stream 19 70 up 58% 89%
Furrells Road, Rochester CSO
Overflow on sewer network
Company site name
FURRELLS ROAD ROCHESTER CSO - 100071
EA ID / permit
SWS00340 · D00079
Outlet location
TQ7480068270 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
19 / 16
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 70 hours spilling →
River Medway Estuary 26 70 up 37% 100%
Downs Park Totton Ceo
Storm discharge at pumping station
Company site name
DOWNES PARK TOTTON CEO - 108423
EA ID / permit
SWS00263 · W00282
Outlet location
SU3593012550 (OS grid reference) · View on Apple Maps
WFD catchment
Bartley Water (GB107042016730)
Shellfish water
Southampton Water
2024 spills / hours
28 / 116
Long-term average
11.8 spills a year (monitored since 2017)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 70 hours spilling →
Bartley Water (Tidal) 12 70 down 57% 98%
Hales Place Orchard CSO
Overflow on sewer network
Company site name
HALES PLACE TENTERDEN CSO - 108649
EA ID / permit
SWS00385 · W02504
Outlet location
TQ8901033350 (OS grid reference) · View on Apple Maps
WFD catchment
Reading Sewer, Small Hythe to Reading Street (GB107040013520)
2024 spills / hours
34 / 152
Long-term average
22.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 67 hours spilling →
The Tider Gill 19 67 down 44% 100%
Wish Street Rye Ceo
Storm discharge at pumping station
Company site name
WISH STREET RYE CEO - 111900
EA ID / permit
SWS00959 · NPSWQD010086
Outlet location
TQ9177020240 (OS grid reference) · View on Apple Maps
WFD catchment
ROTHER (GB540704016100)
2024 spills / hours
109 / 745
Long-term average
53.7 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 66 hours spilling →
River Tillingham 77 66 down 29% 100%
Wotton Road CSO
Overflow on sewer network
Company site name
WOTTON ROAD ASHFORD CSO - 108762
EA ID / permit
SWS00972 · A01054
Outlet location
TR0107041140 (OS grid reference) · View on Apple Maps
WFD catchment
East Stour (GB107040019640)
2024 spills / hours
35 / 195
Long-term average
24.5 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 65 hours spilling →
Trib of the East Stour 18 65 down 49% 99%
Linstone Chine CSO
Overflow on sewer network
Company site name
MONKS LANE LINSTONE CHINE CSO - 101227
EA ID / permit
SWS00506 · A00721
Outlet location
SZ3305088630 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Colwell Bay; Totland Bay
Shellfish water
Lymington and Sowley; Pennington; Yarmouth
2024 spills / hours
10 / 38
Long-term average
7.1 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 65 hours spilling →
Colwell Bay 9 65 down 10% 89%
Dodnor Lane CSO
Overflow on sewer network
Company site name
DODNOR LANE NEWPORT CSO - 102787
EA ID / permit
SWS00255 · W00173
Outlet location
SZ5013090100 (OS grid reference) · View on Apple Maps
WFD catchment
MEDINA (GB520710101600)
Shellfish water
Cowes and Medina
2024 spills / hours
34 / 110
Long-term average
19.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 65 hours spilling →
Tributary of River Medina 23 65 down 32% 100%
Newick WwTW
Storm tank at sewage works
Sewage works
Newick
Company site name
NEWICK SSO - 115728
EA ID / permit
SWS00602 · W00358
Outlet location
TQ4254022000 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Ouse (GB107041012710)
2024 spills / hours
28 / 304
Long-term average
20.3 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 64 hours spilling →
River Ouse 15 64 down 46% 100%
North End Avenue Portsmouth CSO
Overflow on sewer network
Company site name
NORTH END AVENUE PORTSMOUTH CSO - 108773
EA ID / permit
SWS00608 · A01275
Outlet location
SU6407002460 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Portsmouth Harbour; Spithead and Stokes Bay
2024 spills / hours
49 / 92
Long-term average
24.9 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
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 63 hours spilling →
Portsmouth Harbour 31 63 down 37% 100%
Mill Stream, Tonbridge CSO
Overflow on sewer network
Company site name
OLD HADLOW ROAD TONBRIDGE CSO - 107444
EA ID / permit
SWS00576 · A00451
Outlet location
TQ6076047490 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Eden Confluence to Yalding (GB106040018182)
2024 spills / hours
21 / 200
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 63 hours spilling →
Mill Stream 12 63 down 43% 100%
Felride Haywards Heath CSO
Overflow on sewer network
Company site name
FELRIDE HAYWARDS HEATH CSO - 108805
EA ID / permit
SWS00305 · A01426
Outlet location
TQ3257022620 (OS grid reference) · View on Apple Maps
WFD catchment
R. Adur East (GB107041012220)
2024 spills / hours
25 / 69
Long-term average
15.5 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 63 hours spilling →
Unnamed Trib of River Adur 17 63 down 32% 39%
Outside 83 East Beach Selsey Ceo
Overflow on sewer network
Company site name
OUTSIDE 83 EAST BEACH SELSEY CEO - 115286
EA ID / permit
SWS00632 · Permit applied for
Outlet location
SZ8658093347 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex (GB640704540003)
Bathing water
Selsey
2024 spills / hours
27 / 174
Long-term average
17.6 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 62 hours spilling →
English Channel 9 62 down 67% 100%
Hilden Bridge Pumping Station
Storm discharge at pumping station
Company site name
HILDEN BRIDGE CEO - 108812
EA ID / permit
SWS00433 · A01411
Outlet location
TQ5851047370 (OS grid reference) · View on Apple Maps
WFD catchment
Hilden Brook (GB106040018170)
2024 spills / hours
13 / 106
Long-term average
9.4 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 61 hours spilling →
The Hilden Brook 7 61 down 46% 100%
Hoeford Fareham Ceo
Storm discharge at pumping station
Company site name
HOEFORD FAREHAM CEO - 108442
EA ID / permit
SWS00438 · A01414
Outlet location
SU5783004490 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Shellfish water
Portsmouth Harbour
2024 spills / hours
25 / 97
Long-term average
17.1 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 61 hours spilling →
Hoeford Lake 16 61 down 36% 100%
Broad Oak Botley CSO
Overflow on sewer network
Company site name
BROADOAK BOTLEY CSO - 108401
EA ID / permit
SWS00101 · A01018
Outlet location
SU5046013150 (OS grid reference) · View on Apple Maps
WFD catchment
Main River Hamble (GB107042016250)
2024 spills / hours
25 / 230
Long-term average
11.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 60 hours spilling →
Tributary of River Hamble 26 60 up 4% 100%
Charing WwTW
Storm tank at sewage works
Sewage works
Charing
Company site name
CHARING SSO - 115769
EA ID / permit
SWS00162 · W00542
Outlet location
TQ9541048500 (OS grid reference) · View on Apple Maps
WFD catchment
Upper Great Stour (GB107040019660)
2024 spills / hours
38 / 484
Long-term average
22.8 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 60 hours spilling →
The Great Stour 12 60 down 68% 100%
Iping Nort CSO
Storm discharge at pumping station
Company site name
IPING LANE IPING NORTH CEO - 108261
EA ID / permit
SWS00464 · A01037
Outlet location
SU8529022920 (OS grid reference) · View on Apple Maps
WFD catchment
Western Rother (GB107041012810)
2024 spills / hours
24 / 150
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 60 hours spilling →
Freshwater River 9 60 down 63% 100%
Brockenhurst WwTW
Inlet overflow at sewage works
Sewage works
Brockenhurst
Company site name
BROCKENHURST CSO - 115399
EA ID / permit
SWS00108 · W00311
Outlet location
SU3090002600 (OS grid reference) · View on Apple Maps
WFD catchment
Lymington River (GB107042011220)
2024 spills / hours
19 / 169
Long-term average
13.2 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 59 hours spilling →
Lymington River 10 59 down 47% 100%
Chestnut Walk Wwps
Storm discharge at pumping station
Company site name
CHESTNUT WALK BEXHILL CEO - 108204
EA ID / permit
SWS00170 · A01143
Outlet location
TQ7134008260 (OS grid reference) · View on Apple Maps
WFD catchment
East Stream (GB107041012430)
2024 spills / hours
38 / 152
Long-term average
28.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 59 hours spilling →
Freshwater River 21 59 down 45% 100%
Ladies Walk Binstead Ceo
Storm discharge at pumping station
Company site name
LADIES WALK BINSTEAD CEO - 107406
EA ID / permit
SWS00066 · A00762
Outlet location
SZ5775092760 (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
23 / 96
Long-term average
15.0 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 59 hours spilling →
Binstead Stream 14 59 down 39% 100%
Pier Road Southsea CSO
Storm discharge at pumping station
Company site name
PIER ROAD SOUTHSEA CSO - 108469
EA ID / permit
SWS00664 · W00278
Outlet location
SZ6312099120 (OS grid reference) · View on Apple Maps
WFD catchment
PORTSMOUTH HARBOUR (GB580705140000)
Bathing water
Southsea East; Stokes Bay
Shellfish water
Langstone Harbour; Portsmouth Harbour; Ryde; Spithead and Stokes Bay
2024 spills / hours
30 / 31
Long-term average
28.4 spills a year (monitored since 2016)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Jul
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 59 hours spilling →
Portsmouth Harbour 43 59 up 43% 50%
Ringwood Drive North Baddesley Ceo
Storm discharge at pumping station
Company site name
RINGWOOD DRIVE NORTH BADDESLEY CEO - 109515
EA ID / permit
SWS00709 · A01291
Outlet location
SU3839019890 (OS grid reference) · View on Apple Maps
WFD catchment
Luzborough Lane Stream (GB107042016800)
2024 spills / hours
24 / 150
Long-term average
9.7 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 58 hours spilling →
Unnamed Trib. of River Test 9 58 down 63% 100%
Newtown Road Newtown Ceo
Storm discharge at pumping station
Company site name
NEWTOWN ROAD NEWTOWN CEO - 108461
EA ID / permit
SWS00604 · A01418
Outlet location
SU4939005070 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water; Central Solent; Stanswood Bay; Approaches to Southampton Water
2024 spills / hours
34 / 476
Long-term average
14.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 58 hours spilling →
Hook Lake 11 58 down 68% 100%
Broadford Ceo
Storm discharge at pumping station
Company site name
BROADFORD CEO - 108592
EA ID / permit
SWS00103 · K02074
Outlet location
TQ7157039530 (OS grid reference) · View on Apple Maps
WFD catchment
Lesser Teise (GB106040018260)
2024 spills / hours
19 / 97
Long-term average
17.2 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 57 hours spilling →
Trib of River Teise 10 57 down 47% 100%
Nursery Lane Pumping Station
Storm discharge at pumping station
Company site name
NURSERY LANE NUTLEY CEO - 108298
EA ID / permit
SWS00624 · A00705
Outlet location
TQ4444027580 (OS grid reference) · View on Apple Maps
WFD catchment
Shortbridge Stream (GB107041012980)
2024 spills / hours
14 / 20
Long-term average
10.0 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 57 hours spilling →
Freshwater River 23 57 up 64% 100%
Biddenden WwTW
Storm tank at sewage works
Sewage works
Biddenden
Company site name
BIDDENDEN SSO - 115736
EA ID / permit
SWS00064 · W00514
Outlet location
TQ8480038750 (OS grid reference) · View on Apple Maps
WFD catchment
Hammer Stream (GB106040018290)
2024 spills / hours
26 / 221
Long-term average
24.0 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 56 hours spilling →
The River Beult 8 56 down 69% 99%
Jonas Lane Wadhurst Ceo
Storm discharge at pumping station
Company site name
JONAS LANE WADHURST CEO - 108267
EA ID / permit
SWS00469 · A00289
Outlet location
TQ6326032550 (OS grid reference) · View on Apple Maps
WFD catchment
Bartley Mill Stream (GB106040018240)
2024 spills / hours
23 / 113
Long-term average
11.3 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 56 hours spilling →
A Tributary of River Teise 16 56 down 30% 100%
St Pauls Street Sittingbourne CSO
Overflow on sewer network
Company site name
ST PAULS STREET SITTINGBOURNE CSO - 107453
EA ID / permit
SWS00820 · A00444
Outlet location
TQ9054064300 (OS grid reference) · View on Apple Maps
WFD catchment
SWALE (GB530604011500)
Shellfish water
Swale Central
2024 spills / hours
17 / 33
Long-term average
26.4 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 56 hours spilling →
Milton Creek 32 56 up 88% 100%
Luxford Ln-East Grinstead WwTW
Storm tank at sewage works
Sewage works
Luxford Ln East Grinstead
Company site name
LUXFORDS LANE EAST GRINSTEAD SSO - 115786
EA ID / permit
SWS00529 · A00532
Outlet location
TQ4044036290 (OS grid reference) · View on Apple Maps
WFD catchment
Medway at Weir Wood (GB106040018070)
2024 spills / hours
8 / 35
Long-term average
7.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 55 hours spilling →
The Sunnyside Stream 15 55 up 88% 100%
Ham Hill WwTW
Storm tank at sewage works
Sewage works
Ham Hill
Company site name
HAM HILL SSO - 115859
EA ID / permit
SWS00388 · W00503
Outlet location
TQ7119061330 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
22 / 190
Long-term average
17.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 55 hours spilling →
The River Medway Estuary 8 55 down 64% 98%
Balcombe Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Balcombe
Company site name
BALCOMBE CEO - 115977
EA ID / permit
SWS00034 · A01510
Outlet location
TQ3136028530 (OS grid reference) · View on Apple Maps
WFD catchment
Ouse from Slaugham to Ardingly Resevoir (GB107041012730)
2024 spills / hours
39 / 310
Long-term average
7.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 55 hours spilling →
Unnamed Trib of River Ouse 7 55 down 82% 94%
Gibbetts Marsh PS
Storm discharge at pumping station
Company site name
GIBBETS MARSH RYE CEO - 108236
EA ID / permit
SWS00346 · A01148
Outlet location
TQ9174020240 (OS grid reference) · View on Apple Maps
WFD catchment
ROTHER (GB540704016100)
2024 spills / hours
0 / 0.0
Long-term average
8.3 spills a year (monitored since 2016)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 54 hours spilling →
Freshwater River 22 54 up from 0 100%
Fairwarp Pumping Station
Storm discharge at pumping station
Company site name
FURNACE WOOD FAIRWARP CEO - 109335
EA ID / permit
SWS00299 · A00279
Outlet location
TQ4724026300 (OS grid reference) · View on Apple Maps
WFD catchment
Shortbridge Stream (GB107041012980)
2024 spills / hours
64 / 951
Long-term average
27.2 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 53 hours spilling →
Shortbridge Stream 10 53 down 84% 100%
Staplehurst WwTW
Storm tank at sewage works
Sewage works
Staplehurst
Company site name
STAPLEHURST SSO - 115800
EA ID / permit
SWS00824 · W00533
Outlet location
TQ7947044700 (OS grid reference) · View on Apple Maps
WFD catchment
Beult (GB106040018270)
2024 spills / hours
16 / 83
Long-term average
12.2 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 53 hours spilling →
The River Beult 7 53 down 56% 100%
Northbridge St Robertsbridge CSO
Storm discharge at pumping station
Company site name
NORTHBRIDGE STREET ROBERTSBRIDGE CEO - 108297
EA ID / permit
SWS00615 · K02080
Outlet location
TQ7389023900 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Rother from Robertsbridge to Iden (GB107040013640)
2024 spills / hours
32 / 125
Long-term average
16.1 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 52 hours spilling →
Robertsbridge Petty Sewer 14 52 down 56% 100%
Hazel Way Crawley Dowm Ceo
Storm discharge at pumping station
Company site name
HAZEL WAY CRAWLEY DOWN CEO - 108245
EA ID / permit
SWS00412 · A00284
Outlet location
TQ3532037770 (OS grid reference) · View on Apple Maps
WFD catchment
Medway at Weir Wood (GB106040018070)
2024 spills / hours
18 / 90
Long-term average
12.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 52 hours spilling →
Trib of the River Medway 12 52 down 33% 100%
Bognor Main Ceo
Storm discharge at pumping station
Company site name
BOGNOR MAIN CEO - 107412
EA ID / permit
SWS00597 · A00731
Outlet location
SZ9456099560 (OS grid reference) · View on Apple Maps
WFD catchment
Aldingbourne Rife (GB107041011980)
Bathing water
Bognor Regis (Aldwick); Bognor Regis East; Felpham; Middleton-on-sea
2024 spills / hours
20 / 112
Long-term average
15.8 spills a year (monitored since 2016)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing
Volume & pollution
Estimate from 51 hours spilling →
Ditch to Aldingbourne Rife 10 51 down 50% 100%
Pasture Hill Road Combined Sewer
Overflow on sewer network
Company site name
PASTURE HILL ROAD CSO - 111608
EA ID / permit
SWS00646 · NPSWQD004305
Outlet location
TQ3262024660 (OS grid reference) · View on Apple Maps
WFD catchment
Scrase Bridge Stream at Haywards Heath (GB107041012680)
2024 spills / hours
25 / 209
Long-term average
13.7 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 51 hours spilling →
Tributary of Scrase Stream 10 51 down 60% 100%
Dock Road Gillingham CSO
Overflow on sewer network
Company site name
DOCK ROAD GILLINGHAM CSO - 108628
EA ID / permit
SWS00254 · A00393
Outlet location
TQ7598069660 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
36 / 35
Long-term average
30.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 51 hours spilling →
River Medway 30 51 down 17% 91%
Gardner Street Sewage Works
Storm discharge at pumping station
Company site name
GARDNER STREET HERSTMONCEUX SSO - 115956
EA ID / permit
SWS00343 · W00454
Outlet location
TQ6386012820 (OS grid reference) · View on Apple Maps
WFD catchment
Nunningham Stream (GB107041012610)
2024 spills / hours
34 / 186
Long-term average
25.7 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 51 hours spilling →
Trib of Nunningham Stream 8 51 down 76% 100%
Horsmonden Road Pumping Station
Storm discharge at pumping station
Company site name
HORSMONDEN ROAD BRENCHLEY CEO - 108658
EA ID / permit
SWS00450 · A00234
Outlet location
TQ6849040980 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Teise (GB106040018130)
2024 spills / hours
20 / 81
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 50 hours spilling →
Trib of the River Teise 12 50 down 40% 100%
Main Street Flimwell Ceo
Overflow on sewer network
Company site name
MAIN STREET FLIMWELL CEO - 116222
EA ID / permit
SWS00982 · Unpermitted
Outlet location
TQ7139031510 (OS grid reference) · View on Apple Maps
WFD catchment
Teise at Bewl (GB106040018500)
2024 spills / hours
60 / 535
Long-term average
26.0 spills a year (monitored since 2023)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 50 hours spilling →
Trib of the River Medway 14 50 down 77% 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.