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
Jackies Lane Newick Ceo
Storm discharge at pumping station
Company site name
JACKIES LANE NEWICK CEO - 108263
EA ID / permit
SWS00467 · A01034
Outlet location
TQ4118021680 (OS grid reference) · View on Apple Maps
WFD catchment
Middle Ouse (GB107041012710)
2024 spills / hours
75 / 633
Long-term average
36.4 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 105 hours spilling →
Tributary of River Ouse 23 105 down 69% 100%
Land Adj. Billingshurst Pump. Stn
Storm discharge at pumping station
Company site name
STANE STREET BILLINGSHURST CEO - 108189
EA ID / permit
SWS00489 · A02501
Outlet location
TQ0797024810 (OS grid reference) · View on Apple Maps
WFD catchment
R. Arun (U/S Pallingham) (GB107041017950)
2024 spills / hours
15 / 87
Long-term average
11.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 105 hours spilling →
Par Brook 15 105 no change 100%
Fairlight WwTW
Storm tank at sewage works
Sewage works
Fairlight
Company site name
FAIRLIGHT SSO - 115941
EA ID / permit
SWS00296 · W00545
Outlet location
TQ8814012810 (OS grid reference) · View on Apple Maps
WFD catchment
Marsham and Pannel Sewers (GB107040013390)
2024 spills / hours
51 / 475
Long-term average
41.6 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 105 hours spilling →
Tributary of Marsham Sewer 19 105 down 63% 100%
Seagrove Wps CSO
Storm discharge at pumping station
Company site name
SEAGROVE BAY CEO - 100244
EA ID / permit
SWS00755 · A00764
Outlet location
SZ6309091290 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Ryde; Seagrove; St Helens
Shellfish water
Ryde; Spithead and Stokes Bay
2024 spills / hours
32 / 221
Long-term average
9.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 104 hours spilling →
The Solent 18 104 down 44% 100%
Rolvenden Layne WwTW
Storm tank at sewage works
Sewage works
Rolvenden Layne
Company site name
ROLVENDEN LAYNE SSO - 115762
EA ID / permit
SWS00717 · W00501
Outlet location
TQ8527029690 (OS grid reference) · View on Apple Maps
WFD catchment
Hexden Channel (GB107040019670)
2024 spills / hours
38 / 369
Long-term average
29.5 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 103 hours spilling →
Trib of the Hexden Channel 10 103 down 74% 98%
Ball Lane- Kennington CSO
Overflow on sewer network
Company site name
BALL LANE KENNINGTON CSO - 108579
EA ID / permit
SWS00037 · A00900
Outlet location
TR0285045420 (OS grid reference) · View on Apple Maps
WFD catchment
Great Stour between Ashford and Wye (GB107040019741)
2024 spills / hours
47 / 822
Long-term average
30.6 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Sep
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 101 hours spilling →
Great Stour 11 101 down 77% 90%
CSO Pellings Wood
Overflow on sewer network
Company site name
PELLINGS WOOD CROWBOROUGH CSO - 103289
EA ID / permit
SWS00236 · A01030
Outlet location
TQ5250031330 (OS grid reference) · View on Apple Maps
WFD catchment
Tributary of upper Medway at Crowborough (GB106040013360)
2024 spills / hours
33 / 131
Long-term average
27.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 100 hours spilling →
Freshwater River 29 100 down 12% 100%
Wroxall WwTW
Inlet overflow at sewage works
Sewage works
Wroxall
Company site name
WROXALL CEO - 116003
EA ID / permit
SWS00973 · W00203
Outlet location
SZ5473080930 (OS grid reference) · View on Apple Maps
WFD catchment
Wroxall Stream (GB107101006210)
2024 spills / hours
71 / 328
Long-term average
44.5 spills a year (monitored since 2017)
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 100 hours spilling →
Wroxall Stream 33 100 down 54% 100%
Lymore (Northbrook Cottage) CSO
Overflow on sewer network
Company site name
LYMORE CSO - 108463
EA ID / permit
SWS00532 · H01221
Outlet location
SZ2961092810 (OS grid reference) · View on Apple Maps
WFD catchment
Avon Water (GB107042011300)
Shellfish water
Lymington and Sowley; Pennington; Yarmouth
2024 spills / hours
84 / 1,315
Long-term average
43.1 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 100 hours spilling →
Lymore Stream 26 100 down 69% 100%
Stockers Hill Boughton St Ceo
Storm discharge at pumping station
Company site name
STOCKERS HILL BOUGHTON STREET CEO - 110360
EA ID / permit
SWS00083 · W0558A
Outlet location
TR0521059930 (OS grid reference) · View on Apple Maps
WFD catchment
White Drain (GB106040018560)
Shellfish water
Swale Central; Swale East; Swalecliffe
2024 spills / hours
43 / 238
Long-term average
34.3 spills a year (monitored since 2019)
High-spill reason (company)
Not asset maintenance - Hydraulic capacity
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 100 hours spilling →
Freshwater River 31 100 down 28% 100%
Gruneison Road Storm PS
Overflow on sewer network
Company site name
GLADYS AVENUE PORTSMOUTH CSO - 108434
EA ID / permit
SWS00376 · W00279
Outlet location
SU6407002560 (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
56 / 124
Long-term average
27.3 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 99 hours spilling →
Portsmouth Harbour 39 99 down 30% 100%
Fordcombe Wastewater Treatment Wrks
Inlet overflow at sewage works
Sewage works
Fordcombe Wastewater Treatment Wrks
Company site name
FORDCOMBE CSO - 115982
EA ID / permit
SWS00322 · A01201
Outlet location
TQ5232040410 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Hartfield to Eden Confluence (GB106040018181)
2024 spills / hours
50 / 277
Long-term average
34.7 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 99 hours spilling →
A Trib of the River Medway 21 99 down 58% 98%
St Mary Road Cowes Wwps CSO
Storm discharge at pumping station
Company site name
ST MARYS ROAD COWES CSO - 108562
EA ID / permit
SWS00815 · A01356
Outlet location
SZ4976096140 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Cowes; Gurnard
Shellfish water
Central Solent; Cowes and Medina; Spithead and Stokes Bay; Stanswood Bay
2024 spills / hours
114 / 1,042
Long-term average
54.4 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 98 hours spilling →
The Solent 51 98 down 55% 100%
Cockshot Farm CSO, Hawkhurst, Kent
Overflow on sewer network
Company site name
COCKSHOT FARM HAWKHURST NO 3 CSO - 110321
EA ID / permit
SWS00188 · A01178
Outlet location
TQ7610029970 (OS grid reference) · View on Apple Maps
WFD catchment
Kent Ditch (GB107040013600)
2024 spills / hours
38 / 196
Long-term average
29.8 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 96 hours spilling →
The Hawkhurst South Stream 23 96 down 39% 100%
Tunbridge Wells CSO, Apple Tree Lne
Overflow on sewer network
Company site name
APPLE TREE LANE TUNBRIDGE WELLS CSO - 107414
EA ID / permit
SWS00886 · W00570
Outlet location
TQ5977041850 (OS grid reference) · View on Apple Maps
WFD catchment
Somerhill Stream (GB106040018410)
2024 spills / hours
73 / 122
Long-term average
53.1 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 95 hours spilling →
The Somerhill Stream 55 95 down 25% 100%
Ferry Hill Winchelsea WwTW
Storm tank at sewage works
Sewage works
Ferry Hill Winchelsea
Company site name
FERRY HILL WINCHELSEA SSO - 115808
EA ID / permit
SWS00309 · W00560
Outlet location
TQ9037017890 (OS grid reference) · View on Apple Maps
WFD catchment
Brede between Battle and Winchelsea (GB107040013550)
2024 spills / hours
20 / 67
Long-term average
14.6 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 95 hours spilling →
Tributary of River Brede 12 95 down 40% 100%
Southwick WwTW
Storm tank at sewage works
Sewage works
Southwick
Company site name
SOUTHWICK SSO - 115780
EA ID / permit
SWS00801 · W00248
Outlet location
SU6177008780 (OS grid reference) · View on Apple Maps
WFD catchment
R. Wallington (GB107042016360)
Shellfish water
Portsmouth Harbour
2024 spills / hours
35 / 399
Long-term average
18.3 spills a year (monitored since 2017)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 93 hours spilling →
River Wallington 9 93 down 74% 99%
Burnetts Lane Wps
Storm discharge at pumping station
Company site name
BURNETTS LANE HORTON HEATH CEO - 108404
EA ID / permit
SWS00125 · A01182
Outlet location
SU4927017020 (OS grid reference) · View on Apple Maps
WFD catchment
River Itchen (GB107042022580)
2024 spills / hours
31 / 302
Long-term average
13.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 93 hours spilling →
Tributary of River Itchen 11 93 down 65% 100%
Ewhurst Lane Pumping Station
Storm discharge at pumping station
Company site name
EWHURST LANE NORTHIAM CEO - 108221
EA ID / permit
SWS00292 · A00628
Outlet location
TQ8230024640 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Rother from Robertsbridge to Iden (GB107040013640)
2024 spills / hours
38 / 266
Long-term average
29.2 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 93 hours spilling →
Freshwater River 17 93 down 55% 100%
Polegrove Tank CSO
Overflow on sewer network
Company site name
BROCKLEY ROAD BEXHILL CSO - 103297
EA ID / permit
SWS00668 · A00742
Outlet location
TQ7374006930 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Bexhill
2024 spills / hours
46 / 622
Long-term average
26.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 93 hours spilling →
Controlled Sea 10 93 down 78% 97%
Eggpie Lane Leigh CSO
Overflow on sewer network
Company site name
EGGPIE LANE LEIGH CSO - 108633
EA ID / permit
SWS00282 · W00582
Outlet location
TQ5439048770 (OS grid reference) · View on Apple Maps
WFD catchment
Bid Stream (GB106040018150)
2024 spills / hours
41 / 204
Long-term average
24.9 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 92 hours spilling →
Unnamed Dicth/Stream 21 92 down 49% 98%
Cranbrook WwTW
Inlet overflow at sewage works
Sewage works
Cranbrook
Company site name
CRANBROOK CSO - 115404
EA ID / permit
SWS00221 · W00497
Outlet location
TQ7824036200 (OS grid reference) · View on Apple Maps
WFD catchment
Hammer Stream (GB106040018290)
2024 spills / hours
62 / 416
Long-term average
20.8 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 92 hours spilling →
The Crane Brook 40 92 down 35% 100%
Petworth Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Petworth
Company site name
PETWORTH CSO - 115427
EA ID / permit
SWS00660 · W00471
Outlet location
SU9783019130 (OS grid reference) · View on Apple Maps
WFD catchment
Western Rother (GB107041012810)
2024 spills / hours
8 / 26
Long-term average
40.3 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 91 hours spilling →
River Rother 36 91 up 350% 100%
Cooden Beach Tank CSO
Overflow on sewer network
Company site name
COODEN BEACH BEXHILL CSO - 108029
EA ID / permit
SWS00198 · A00746
Outlet location
TQ7103006360 (OS grid reference) · View on Apple Maps
WFD catchment
Sussex East (GB640704540002)
Bathing water
Bexhill; Norman`s Bay
2024 spills / hours
7 / 30
Long-term average
5.1 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 90 hours spilling →
Controlled Sea 6 90 down 14% 98%
Reeds Lane, Shipbourne Ceo
Storm discharge at pumping station
Company site name
REEDS LANE SHIPBOURNE CEO - 108019
EA ID / permit
SWS00704 · A00259
Outlet location
TQ6018052050 (OS grid reference) · View on Apple Maps
WFD catchment
Bourne (GB106040018210)
2024 spills / hours
29 / 239
Long-term average
21.3 spills a year (monitored since 2018)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 89 hours spilling →
The River Bourne 13 89 down 55% 90%
Southborough Cemetery Tunbridge
Overflow on sewer network
Company site name
SOUTHBOROUGH CEMETERY TUNBRIDGE WELLS CSO - 108734
EA ID / permit
SWS00797 · K02127
Outlet location
TQ5705042500 (OS grid reference) · View on Apple Maps
WFD catchment
Barden Mill Stream (GB106040018100)
2024 spills / hours
35 / 52
Long-term average
26.2 spills a year (monitored since 2019)
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 88 hours spilling →
Trib of the River Medway 37 88 up 6% 96%
Rudgwick Recreation Ground CSO
Storm discharge at pumping station
Company site name
RUDGWICK RECREATION GROUND CSO - 108268
EA ID / permit
SWS00724 · W00332
Outlet location
TQ0807032640 (OS grid reference) · View on Apple Maps
WFD catchment
R. Arun (U/S Pallingham) (GB107041017950)
2024 spills / hours
20 / 117
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 88 hours spilling →
Tributary of River Arun 13 88 down 35% 93%
Westway Springhill Ceo
Storm discharge at pumping station
Company site name
WESTWAY SPRINGHILL CEO - 108559
EA ID / permit
SWS00936 · A00229
Outlet location
SZ4082087800 (OS grid reference) · View on Apple Maps
WFD catchment
Caul Bourne (GB107101006020)
Shellfish water
Newtown; Yarmouth
2024 spills / hours
24 / 127
Long-term average
20.0 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 87 hours spilling →
The Caul Bourne 24 87 no change 100%
Frittenden WwTW
Storm tank at sewage works
Sewage works
Frittenden
Company site name
FRITTENDEN SSO - 115751
EA ID / permit
SWS00337 · W00028
Outlet location
TQ8139041930 (OS grid reference) · View on Apple Maps
WFD catchment
Tributary of Beult at Frittenden (GB106040018030)
2024 spills / hours
25 / 277
Long-term average
18.5 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 86 hours spilling →
Maplehurst Stream 15 86 down 40% 100%
Priory Road Tonbridge O/S 86 CSO
Overflow on sewer network
Company site name
PRIORY ROAD TONBRIDGE OUTSIDE 86 CSO - 108707
EA ID / permit
SWS00680 · A00453
Outlet location
TQ5932046030 (OS grid reference) · View on Apple Maps
WFD catchment
Mid Medway from Eden Confluence to Yalding (GB106040018182)
2024 spills / hours
55 / 264
Long-term average
38.9 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 86 hours spilling →
Botany Stream 30 86 down 45% 98%
Cosham PS
Storm discharge at pumping station
Company site name
COURT LANE COSHAM SSO - 115958
EA ID / permit
SWS00206 · A00657
Outlet location
SU6622004460 (OS grid reference) · View on Apple Maps
WFD catchment
LANGSTONE HARBOUR (GB580705130000)
Shellfish water
Langstone Harbour; Portsmouth Harbour
2024 spills / hours
19 / 73
Long-term average
15.9 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 86 hours spilling →
Ports Creek 22 86 up 16% 100%
Underhill Goudhurst WwTW
Storm tank at sewage works
Sewage works
Underhill Goudhurst
Company site name
UNDERHILL GOUDHURST SSO - 115750
EA ID / permit
SWS00894 · W00134
Outlet location
TQ7207036720 (OS grid reference) · View on Apple Maps
WFD catchment
Tributary of Teise (GB106040018510)
2024 spills / hours
41 / 362
Long-term average
17.1 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 85 hours spilling →
Tributary of River Teise 13 85 down 68% 98%
Crowhurst Ceo
Storm discharge at pumping station
Company site name
CROWHURST CEO - 108217
EA ID / permit
SWS00490 · W00413
Outlet location
TQ7601011800 (OS grid reference) · View on Apple Maps
WFD catchment
Powdermill Stream (GB107041012550)
2024 spills / hours
85 / 591
Long-term average
47.0 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 85 hours spilling →
Powdermill Stream 37 85 down 56% 100%
Freshwater Bay PS
Storm discharge at pumping station
Company site name
COASTGUARD LANE FRESHWATER BAY CEO - 108521
EA ID / permit
SWS00334 · A00224
Outlet location
SZ3470085820 (OS grid reference) · View on Apple Maps
WFD catchment
Dorset / Hampshire (GB620705550000)
Shellfish water
Pennington; Yarmouth
2024 spills / hours
17 / 76
Long-term average
12.6 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 85 hours spilling →
Drain to Western Yar 15 85 down 12% 100%
Turners Mead P.S.
Storm discharge at pumping station
Company site name
TURNERS MEAD CHIDDINGFOLD CEO - 108370
EA ID / permit
SWS00890 · A00312
Outlet location
SU9607035250 (OS grid reference) · View on Apple Maps
WFD catchment
Loxwood/Chiddingfold Trib (GB107041017960)
2024 spills / hours
23 / 153
Long-term average
18.7 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 84 hours spilling →
Freshwater River 13 84 down 43% 100%
Stone Green Stone in Oxney WwTW
Inlet overflow at sewage works
Sewage works
Stone Green Stone In Oxney
Company site name
STONE GREEN STONE IN OXNEY CSO - 116046
EA ID / permit
SWS00832 · W00579
Outlet location
TQ9424027670 (OS grid reference) · View on Apple Maps
WFD catchment
Walland Marsh, Iden to Appledore (GB107040013670)
2024 spills / hours
44 / 147
Long-term average
37.2 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 84 hours spilling →
Trib of the River Rother 71 84 up 61% 100%
Kingsnorth Road, Ashford CSO
Overflow on sewer network
Company site name
KINGSNORTH ROAD ASHFORD CSO - 108583
EA ID / permit
SWS00481 · A01232
Outlet location
TR0101041380 (OS grid reference) · View on Apple Maps
WFD catchment
East Stour (GB107040019640)
2024 spills / hours
27 / 138
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 84 hours spilling →
Tributary of East Stour 23 84 down 15% 100%
Malthouse Lane Pumping Station
Storm discharge at pumping station
Company site name
MALTHOUSE LANE BURGESS HILL CEO - 108281
EA ID / permit
SWS00543 · A01482
Outlet location
TQ2923019270 (OS grid reference) · View on Apple Maps
WFD catchment
Herrings Stream (GB107041012150)
2024 spills / hours
28 / 65
Long-term average
13.0 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 83 hours spilling →
Pook Bourne 30 83 up 7% 100%
Polegate No.1 CSO Lynholm Rd Polegt
Storm discharge at pumping station
Company site name
LYNHOLM ROAD POLEGATE NO.1 CSO - 115317
EA ID / permit
SWS00667 · A01443A
Outlet location
TQ5923004540 (OS grid reference) · View on Apple Maps
WFD catchment
Langley Sewer at Eastbourne (GB107041006650)
2024 spills / hours
41 / 255
Long-term average
34.5 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 82 hours spilling →
Mill Ditch 21 82 down 49% 100%
Best Beech Hill Ceo
Storm discharge at pumping station
Company site name
BEST BEECH HILL CEO - 110713
EA ID / permit
SWS00059 · A01115
Outlet location
TQ6157031550 (OS grid reference) · View on Apple Maps
WFD catchment
Bartley Mill Stream (GB106040018240)
2024 spills / hours
25 / 140
Long-term average
21.6 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 80 hours spilling →
Trib of Bartley Mill Stream 15 80 down 40% 100%
Glynde North Pumping Station
Storm discharge at pumping station
Company site name
GLYNDE NORTH CEO - 108238
EA ID / permit
SWS00352 · A00283
Outlet location
TQ4576008790 (OS grid reference) · View on Apple Maps
WFD catchment
Glynde Reach (GB107041012510)
2024 spills / hours
28 / 258
Long-term average
12.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 80 hours spilling →
Glynde Reach 12 80 down 57% 100%
Cooksbridge Ceo
Storm discharge at pumping station
Company site name
COOKSBRIDGE CEO - 108209
EA ID / permit
SWS00199 · A01203
Outlet location
TQ4027013850 (OS grid reference) · View on Apple Maps
WFD catchment
Bevern Stream (GB107041012570)
2024 spills / hours
28 / 210
Long-term average
22.3 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 79 hours spilling →
North End Stream 13 79 down 54% 100%
Icklesham WwTW
Storm tank at sewage works
Sewage works
Icklesham
Company site name
ICKLESHAM SSO - 115756
EA ID / permit
SWS00460 · W00502
Outlet location
TQ8905016460 (OS grid reference) · View on Apple Maps
WFD catchment
Brede between Battle and Winchelsea (GB107040013550)
2024 spills / hours
31 / 294
Long-term average
17.7 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 79 hours spilling →
Trib of Royal Military Canal 14 79 down 55% 99%
Dover and Folkestone Waste Water
Overflow on sewer network
Company site name
ELIZABETH STREET DOVER CSO - 110369
EA ID / permit
SWS00259 · A00661
Outlet location
TR2422035940 (OS grid reference) · View on Apple Maps
WFD catchment
Kent South (GB640704540001)
2024 spills / hours
79 / 1,150
Long-term average
32.2 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 79 hours spilling →
The English Channel 19 79 down 76% 100%
The Strand Gillingham Ceo
Storm discharge at pumping station
Company site name
THE STRAND GILLINGHAM CEO - 108740
EA ID / permit
SWS00867 · D00103
Outlet location
TQ7857069400 (OS grid reference) · View on Apple Maps
WFD catchment
MEDWAY (GB530604002300)
2024 spills / hours
67 / 138
Long-term average
34.7 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 78 hours spilling →
The River Medway 34 78 down 49% 98%
Horsted Keynes WwTW
Storm tank at sewage works
Sewage works
Horsted Keynes
Company site name
HORSTED KEYNES SSO - 115915
EA ID / permit
SWS00452 · A00192
Outlet location
TQ3760028280 (OS grid reference) · View on Apple Maps
WFD catchment
Cockhaise Brook (GB107041012740)
2024 spills / hours
99 / 1,755
Long-term average
70.3 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 78 hours spilling →
Cockhaise Brook 11 78 down 89% 100%
Woolston WwTW
Storm tank at sewage works
Sewage works
Woolston
Company site name
WOOLSTON SSO - 115450
EA ID / permit
SWS00969 · A00856
Outlet location
SU4339010440 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Shellfish water
Southampton Water
2024 spills / hours
35 / 340
Long-term average
38.4 spills a year (monitored since 2016)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 78 hours spilling →
River Itchen Estuary 18 78 down 49% 99%
The Leys Fenhurst CSO
Overflow on sewer network
Company site name
THE LEYS FERNHURST CSO - 108357
EA ID / permit
SWS00863 · A00007
Outlet location
SU8936028450 (OS grid reference) · View on Apple Maps
WFD catchment
R. Lod (GB107041012830)
2024 spills / hours
31 / 156
Long-term average
22.0 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Oct
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 78 hours spilling →
Trib of the River Rother West 16 78 down 48% 86%
Egypt Point PS
Storm discharge at pumping station
Company site name
EGYPT POINT COWES CEO Pumped - 116213
EA ID / permit
SWS00284 · A00635
Outlet location
SZ4887096670 (OS grid reference) · View on Apple Maps
WFD catchment
Solent (GB650705150000)
Bathing water
Cowes; Gurnard
Shellfish water
Central Solent; Cowes and Medina; Lepe Middle Bank; Stanswood Bay
2024 spills / hours
61 / 263
Long-term average
63.1 spills a year (monitored since 2020)
High-spill reason (company)
Performance - GW inundation
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 77 hours spilling →
The Solent 44 77 down 28% 100%
Hook Park Wps
Storm discharge at pumping station
Company site name
HOOK PARK NO.1 CEO - 111291
EA ID / permit
SWS00443 · A01486
Outlet location
SU5023004010 (OS grid reference) · View on Apple Maps
WFD catchment
SOUTHAMPTON WATER (GB520704202800)
Bathing water
Hillhead
Shellfish water
Southampton Water; Approaches to Southampton Water; Central Solent; Cowes and Medina; Stanswood Bay
2024 spills / hours
14 / 81
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 76 hours spilling →
Southampton Water 13 76 down 7% 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.