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

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.

Overflow	Discharges to	Spills 2025	Hours 2025	Spills vs 2024	Monitor uptime
St Helens WwTW Storm tank at sewage works Sewage works St Helens Company site name ST HELENS SSO - 115440 EA ID / permit SWS00811 · A00198 Outlet location SZ6255088320 (OS grid reference) · View on Apple Maps WFD catchment Eastern Yar (Lower) (GB107101005971) Bathing water Bembridge; Seagrove; St Helens Shellfish water Ryde 2024 spills / hours 143 / 2,199 Long-term average 93.8 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 516 hours spilling →	Tributary of the Eastern Yar	57	516	down 60%	100%
Smarden Wastewater Treatment Works Storm tank at sewage works Sewage works Smarden Company site name SMARDEN SSO - 115863 EA ID / permit SWS00784 · W00486 Outlet location TQ8776042250 (OS grid reference) · View on Apple Maps WFD catchment Beult (GB106040018270) 2024 spills / hours 68 / 1,092 Long-term average 59.7 spills a year (monitored since 2019) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 516 hours spilling →	The River Beult	41	516	down 40%	98%
Barcombe New S.T.W. Storm tank at sewage works Sewage works Barcombe New S T W Company site name BARCOMBE NEW SSO - 115373 EA ID / permit SWS00039 · W00362 Outlet location TQ4141016690 (OS grid reference) · View on Apple Maps WFD catchment Bevern Stream (GB107041012570) 2024 spills / hours 105 / 867 Long-term average 69.1 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 510 hours spilling →	Bevern Stream	49	510	down 53%	100%
Flexford Lane Sway WwTW Storm tank at sewage works Sewage works Flexford Lane Sway Company site name FLEXFORD LANE SWAY SSO - 115913 EA ID / permit SWS00318 · W00244 Outlet location SZ2888096570 (OS grid reference) · View on Apple Maps WFD catchment Avon Water (GB107042011300) Shellfish water Pennington 2024 spills / hours 132 / 2,303 Long-term average 68.4 spills a year (monitored since 2017) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 508 hours spilling →	Avon Water	43	508	down 67%	100%
Cowden WwTW, Cowden, Tunbridge Well Storm tank at sewage works Sewage works Cowden Cowden Tunbridge Well Company site name COWDEN SSO - 115723 EA ID / permit SWS00213 · W00024 Outlet location TQ4665040170 (OS grid reference) · View on Apple Maps WFD catchment Kent Water (GB106040018090) 2024 spills / hours 72 / 793 Long-term average 43.6 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 506 hours spilling →	Kent Water	47	506	down 35%	100%
Henderson Road Eastney Wps Inlet overflow at sewage works Sewage works Henderson Road Eastney Wps Company site name HENDERSON ROAD EASTNEY CSO - 111912 EA ID / permit SWS00416 · A00754 Outlet location SZ6679093250 (OS grid reference) · View on Apple Maps WFD catchment Solent (GB650705150000) Bathing water Beachlands Central; Beachlands West; Eastney; Southsea East Shellfish water Chichester Harbour (Emsworth Channel); Langstone Harbour; Portsmouth Harbour; Spithead and Stokes Bay 2024 spills / hours 124 / 884 Long-term average 97.6 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 No improvement action in reporting period Volume & pollution Estimate from 500 hours spilling →	The Solent	86	500	down 31%	98%
Cowfold WwTW Storm tank at sewage works Sewage works Cowfold Company site name COWFOLD SSO - 115726 EA ID / permit SWS00216 · W00356 Outlet location TQ2153021970 (OS grid reference) · View on Apple Maps WFD catchment Cowfold Stream (GB107041012260) 2024 spills / hours 71 / 954 Long-term average 49.3 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 500 hours spilling →	Cowfold Stream Trib River Adur	45	500	down 37%	100%
Hailsham North WwTW Storm tank at sewage works Sewage works Hailsham North Company site name HAILSHAM NORTH SSO - 115733 EA ID / permit SWS00383 · A01166 Outlet location TQ6017010650 (OS grid reference) · View on Apple Maps WFD catchment Hurst Haven at Hailsham (GB107041012500) 2024 spills / hours 77 / 897 Long-term average 52.8 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 494 hours spilling →	Tributary of the Hurst Haven	49	494	down 36%	100%
Redgate Mill Crowborough WwTW Storm tank at sewage works Sewage works Redgate Mill Crowborough Company site name REDGATE MILL CROWBOROUGH SSO - 115803 EA ID / permit SWS00701 · W00479 Outlet location TQ5523032520 (OS grid reference) · View on Apple Maps WFD catchment Eridge Stream (GB106040018390) 2024 spills / hours 99 / 1,152 Long-term average 65.6 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 491 hours spilling →	Eridge Stream	44	491	down 56%	100%
Cuckfield WwTW Storm tank at sewage works Sewage works Cuckfield Company site name NEWBURY LANE CUCKFIELD SSO - 115919 EA ID / permit SWS00240 · W00406 Outlet location TQ3033023710 (OS grid reference) · View on Apple Maps WFD catchment Copyhold Stream (GB107041012240) 2024 spills / hours 86 / 1,077 Long-term average 55.8 spills a year (monitored since 2019) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 484 hours spilling →	Trib of River Adur	47	484	down 45%	100%
West Hoathly S.T.W. Storm tank at sewage works Sewage works West Hoathly S T W Company site name WEST HOATHLY SSO - 115792 EA ID / permit SWS00923 · W00020 Outlet location TQ3748033510 (OS grid reference) · View on Apple Maps WFD catchment Medway at Weir Wood (GB106040018070) 2024 spills / hours 54 / 503 Long-term average 29.4 spills a year (monitored since 2017) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 484 hours spilling →	The Coombe Brook	44	484	down 19%	100%
Fairlee Combined Sewer Overflow Storm discharge at pumping station Company site name FAIRLEE CSO - 111781 EA ID / permit SWS00293 · NPSWQD000451 Outlet location SZ5051091250 (OS grid reference) · View on Apple Maps WFD catchment MEDINA (GB520710101600) Shellfish water Cowes and Medina 2024 spills / hours 79 / 1,053 Long-term average 74.9 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 480 hours spilling →	River Medina	52	480	down 34%	100%
Northchapel WwTW Storm tank at sewage works Sewage works Northchapel Company site name NORTHCHAPEL SSO - 115788 EA ID / permit SWS00617 · W00364 Outlet location SU9525029030 (OS grid reference) · View on Apple Maps WFD catchment R. Kird (GB107041012300) 2024 spills / hours 83 / 1,105 Long-term average 48.6 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 471 hours spilling →	River Kird	40	471	down 52%	100%
Petersfield WwTW Storm tank at sewage works Sewage works Petersfield Company site name PETERSFIELD SSO - 115721 EA ID / permit SWS00658 · W00424 Outlet location SU7710022760 (OS grid reference) · View on Apple Maps WFD catchment Stanbridge Stream (GB107041012790) 2024 spills / hours 49 / 331 Long-term average 43.0 spills a year (monitored since 2019) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 459 hours spilling →	Criddell Stream	41	459	down 16%	100%
Quickbourne Lane Northiam WwTW Storm tank at sewage works Sewage works Quickbourne Lane Northiam Company site name QUICKBOURNE LANE NORTHIAM SSO - 115929 EA ID / permit SWS00693 · A00002 Outlet location TQ8354025720 (OS grid reference) · View on Apple Maps WFD catchment Lower Rother from Robertsbridge to Iden (GB107040013640) 2024 spills / hours 114 / 1,488 Long-term average 87.1 spills a year (monitored since 2018) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 458 hours spilling →	The Goddens Gill	47	458	down 59%	100%
Vines Cross WwTW Storm tank at sewage works Sewage works Vines Cross Company site name VINES CROSS SSO - 115888 EA ID / permit SWS00903 · W00013 Outlet location TQ5933016910 (OS grid reference) · View on Apple Maps WFD catchment Waldron Ghyll (GB107041012391) 2024 spills / hours 78 / 1,124 Long-term average 46.9 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 457 hours spilling →	Waldron Ghyll	43	457	down 45%	100%
Laughton CSO Storm discharge at pumping station Company site name LAUGHTON CSO - 108272 EA ID / permit SWS00495 · W00436 Outlet location TQ5014012430 (OS grid reference) · View on Apple Maps WFD catchment Glynde Reach (GB107041012510) 2024 spills / hours 81 / 962 Long-term average 45.6 spills a year (monitored since 2017) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 455 hours spilling →	Tributary of Glynde Reach	47	455	down 42%	92%
Shorwell WwTW Storm tank at sewage works Sewage works Shorwell Company site name SHORWELL SSO - 115754 EA ID / permit SWS00772 · A00197 Outlet location SZ4492082340 (OS grid reference) · View on Apple Maps WFD catchment Brighstone Streams (GB107101005940) 2024 spills / hours 78 / 842 Long-term average 49.6 spills a year (monitored since 2017) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 441 hours spilling →	Shorwell Stream	42	441	down 46%	100%
Brockenhurst WwTW Storm tank at sewage works Sewage works Brockenhurst Company site name BROCKENHURST SSO - 115374 EA ID / permit SWS00109 · W00311 Outlet location SU3090002600 (OS grid reference) · View on Apple Maps WFD catchment Lymington River (GB107042011220) 2024 spills / hours 119 / 1,687 Long-term average 86.8 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 439 hours spilling →	Lymington River	52	439	down 56%	100%
Millbrook WwTW Storm tank at sewage works Sewage works Millbrook Company site name MILLBROOK SSO - 115420 EA ID / permit SWS00579 · A00016 Outlet location SU3871011760 (OS grid reference) · View on Apple Maps WFD catchment SOUTHAMPTON WATER (GB520704202800) Shellfish water Southampton Water 2024 spills / hours 99 / 1,556 Long-term average 61.6 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 439 hours spilling →	The River Test	28	439	down 72%	100%
Hartfield Road CSO Storm discharge at pumping station Company site name HARTFIELD ROAD FOREST ROW CSO - 103306 EA ID / permit SWS00402 · A01340 Outlet location TQ4386034950 (OS grid reference) · View on Apple Maps WFD catchment Medway at Weir Wood (GB106040018070) 2024 spills / hours 95 / 979 Long-term average 54.4 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 438 hours spilling →	The River Medway	56	438	down 41%	100%
Chickenhall Eastleigh WwTW Storm tank at sewage works Sewage works Chickenhall Eastleigh Company site name CHICKENHALL EASTLEIGH SSO - 115771 EA ID / permit SWS00174 · A00154 Outlet location SU4681017880 (OS grid reference) · View on Apple Maps WFD catchment River Itchen (GB107042022580) 2024 spills / hours 73 / 1,000 Long-term average 42.6 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 436 hours spilling →	The River Itchen	31	436	down 58%	100%
Sidlesham WwTW Storm tank at sewage works Sewage works Sidlesham Company site name SIDLESHAM SSO - 115807 EA ID / permit SWS00774 · W00384 Outlet location SZ8512096100 (OS grid reference) · View on Apple Maps WFD catchment Broad Rife (GB107041006580) Bathing water Pagham 2024 spills / hours 57 / 789 Long-term average 53.4 spills a year (monitored since 2018) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 436 hours spilling →	The Broad Rife	37	436	down 35%	100%
Marshall Close CSO - Barnham Overflow on sewer network Company site name MARSHALL CLOSE BARNHAM CSO - 108037 EA ID / permit SWS00557 · A01121 Outlet location SU9592004280 (OS grid reference) · View on Apple Maps WFD catchment Lidsey Rife (GB107041012010) 2024 spills / hours 124 / 1,150 Long-term average 64.4 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 No improvement action in reporting period Volume & pollution Estimate from 434 hours spilling →	Barnham Rife	71	434	down 43%	100%
Lewes Road Lindfield Wps Storm discharge at pumping station Company site name LEWES ROAD LINDFIELD CEO - 108273 EA ID / permit SWS00502 · W00410 Outlet location TQ3501024920 (OS grid reference) · View on Apple Maps WFD catchment Scrase Bridge Stream at Haywards Heath (GB107041012680) 2024 spills / hours 86 / 980 Long-term average 34.0 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 430 hours spilling →	Scrase Stream	50	430	down 42%	100%
Oxted WwTW Storm tank at sewage works Sewage works Oxted Company site name OXTED SSO - 115423 EA ID / permit SWS00637 · A00193 Outlet location TQ3978050040 (OS grid reference) · View on Apple Maps WFD catchment Upper Eden (GB106040018630) 2024 spills / hours 71 / 955 Long-term average 80.0 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 427 hours spilling →	The River Eden	52	427	down 27%	100%
Billingshurst WwTW Storm tank at sewage works Sewage works Billingshurst Company site name BILLINGSHURST SSO - 115764 EA ID / permit SWS00065 · A00526 Outlet location TQ0779024720 (OS grid reference) · View on Apple Maps WFD catchment R. Arun (U/S Pallingham) (GB107041017950) 2024 spills / hours 61 / 664 Long-term average 53.3 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 421 hours spilling →	Par Brook	44	421	down 28%	100%
Barns Green WwTW Inlet overflow at sewage works Sewage works Barns Green Company site name BARNS GREEN SSO - 115748 EA ID / permit SWS00043 · W00385 Outlet location TQ1258026250 (OS grid reference) · View on Apple Maps WFD catchment R. Adur West (GB107041012290) 2024 spills / hours 60 / 503 Long-term average 44.4 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 417 hours spilling →	Parsons Brook	47	417	down 22%	100%
Felbridge WwTW Inlet overflow at sewage works Sewage works Felbridge Company site name FELBRIDGE CSO - 116038 EA ID / permit SWS00304 · W00564 Outlet location TQ3643040930 (OS grid reference) · View on Apple Maps WFD catchment Eden Brook (GB106040018660) 2024 spills / hours 108 / 913 Long-term average 60.0 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 416 hours spilling →	Felbridge Water (Eden Brook)	55	416	down 49%	100%
Balcombe Wastewater Treatment Works Storm tank at sewage works Sewage works Balcombe Company site name BALCOMBE SSO - 115796 EA ID / permit SWS00035 · A01510 Outlet location TQ3136028530 (OS grid reference) · View on Apple Maps WFD catchment Ouse from Slaugham to Ardingly Resevoir (GB107041012730) 2024 spills / hours 59 / 474 Long-term average 43.7 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 416 hours spilling →	Unnamed Trib of River Ouse	33	416	down 44%	100%
Edenbridge WwTW Storm tank at sewage works Sewage works Edenbridge Company site name EDENBRIDGE SSO - 115738 EA ID / permit SWS00281 · A00528 Outlet location TQ4542046470 (OS grid reference) · View on Apple Maps WFD catchment Eden at Bough Beech (GB106040018160) 2024 spills / hours 67 / 783 Long-term average 53.7 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 416 hours spilling →	River Eden	48	416	down 28%	98%
Blackboys WwTW Storm tank at sewage works Sewage works Blackboys Company site name BLACKBOYS SSO - 115873 EA ID / permit SWS00069 · W00361 Outlet location TQ5195021200 (OS grid reference) · View on Apple Maps WFD catchment Tickerage Stream (GB107041012970) 2024 spills / hours 103 / 867 Long-term average 49.8 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 397 hours spilling →	Tickerage Stream	48	397	down 53%	99%
Fareham Road Wickham Ceo Storm discharge at pumping station Company site name FAREHAM ROAD WICKHAM CEO - 108501 EA ID / permit SWS00301 · A01309 Outlet location SU5714011220 (OS grid reference) · View on Apple Maps WFD catchment R. Meon (GB107042016640) 2024 spills / hours 70 / 878 Long-term average 34.8 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 395 hours spilling →	River Meon	35	395	down 50%	95%
Slinfold WwTW Storm tank at sewage works Sewage works Slinfold Company site name SLINFOLD SSO - 116044 EA ID / permit SWS00781 · A01205 Outlet location TQ1132032090 (OS grid reference) · View on Apple Maps WFD catchment R. Arun (U/S Pallingham) (GB107041017950) 2024 spills / hours 104 / 1,189 Long-term average 58.2 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 392 hours spilling →	Unnamed Trib of River Arun	40	392	down 62%	100%
Battle WwTW Storm tank at sewage works Sewage works Battle Company site name BATTLE SSO - 115853 EA ID / permit SWS00046 · W00538 Outlet location TQ7577016220 (OS grid reference) · View on Apple Maps WFD catchment Brede between Battle and Winchelsea (GB107040013550) 2024 spills / hours 101 / 940 Long-term average 82.2 spills a year (monitored since 2019) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 388 hours spilling →	Trib of the River Brede	49	388	down 51%	100%
Portswood WwTW Storm tank at sewage works Sewage works Portswood Company site name PORTSWOOD SSO - 115428 EA ID / permit SWS00674 · W00314 Outlet location SU4356014600 (OS grid reference) · View on Apple Maps WFD catchment SOUTHAMPTON WATER (GB520704202800) Shellfish water Southampton Water 2024 spills / hours 91 / 994 Long-term average 56.3 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 380 hours spilling →	River Itchen Estuary	36	380	down 60%	100%
Horsebridge Pumping Station Storm discharge at pumping station Company site name HELLINGLY CSO - 108247 EA ID / permit SWS00447 · S01450 Outlet location TQ5827012500 (OS grid reference) · View on Apple Maps WFD catchment Cuckmere from Warbleton to Lower Horsebridge (GB107041012390) 2024 spills / hours 72 / 1,021 Long-term average 20.9 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 376 hours spilling →	River Cuckmere	32	376	down 56%	100%
Hamble Lane Bursledon Wastewater PS Storm discharge at pumping station Company site name HAMBLE LANE BURSLEDON CEO - 113675 EA ID / permit SWS00391 · EPR/GB3099NQ Outlet location SU4815008730 (OS grid reference) · View on Apple Maps WFD catchment SOUTHAMPTON WATER (GB520704202800) Shellfish water Southampton Water; Approaches to Southampton Water 2024 spills / hours 63 / 950 Long-term average 40.1 spills a year (monitored since 2016) Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 369 hours spilling →	River Hamble Estuary	29	369	down 54%	100%
Small Dole WwTW Storm tank at sewage works Sewage works Small Dole Company site name SMALL DOLE SSO - 115768 EA ID / permit SWS00783 · A01483 Outlet location TQ2156013710 (OS grid reference) · View on Apple Maps WFD catchment Woodsmill Stream (GB107041012060) 2024 spills / hours 75 / 1,031 Long-term average 53.0 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 368 hours spilling →	Unnamed Trib Tidal River Adur	37	368	down 51%	100%
Partridge Green S.T.W. Storm tank at sewage works Sewage works Partridge Green S T W Company site name PARTRIDGE GREEN SSO - 115766 EA ID / permit SWS00644 · W00470 Outlet location TQ1943018660 (OS grid reference) · View on Apple Maps WFD catchment Adur East (Sakeham) (GB107041012900) 2024 spills / hours 100 / 1,327 Long-term average 73.0 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 No improvement action in reporting period Volume & pollution Estimate from 362 hours spilling →	Unnamed Trib of River Adur	43	362	down 57%	99%
Swalecliffe WwTW Inlet overflow at sewage works Sewage works Swalecliffe Company site name SWALECLIFFE CSO - 115444 EA ID / permit SWS00844 · A01102 Outlet location TR1415069530 (OS grid reference) · View on Apple Maps WFD catchment Thames Coastal South (GB640604640000) Bathing water Herne Bay Central; Tankerton Shellfish water Swale East; Swalecliffe 2024 spills / hours 73 / 685 Long-term average 88.4 spills a year (monitored since 2016) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Sensor failure / issue · Resolved - May 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 361 hours spilling →	The North Sea	49	361	down 33%	73%
Prior Crescent CSO Storm discharge at pumping station Company site name PRIOR CRESCENT NEWPORT CSO - 102414 EA ID / permit SWS00677 · A01226 Outlet location SZ4942091010 (OS grid reference) · View on Apple Maps WFD catchment Lukely Brook (GB107101006250) Shellfish water Cowes and Medina 2024 spills / hours 76 / 506 Long-term average 55.1 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 361 hours spilling →	River Medina	56	361	down 26%	100%
Ryde (Appley Park) Headworks Wps Storm discharge at pumping station Company site name APPLEY PARK RYDE TRANSFER CEO - 108941 EA ID / permit SWS00727 · A00849 Outlet location SZ5973095430 (OS grid reference) · View on Apple Maps WFD catchment Solent (GB650705150000) Bathing water Cowes; Ryde; Seagrove Shellfish water Cowes and Medina; Ryde; Spithead and Stokes Bay 2024 spills / hours 57 / 619 Long-term average 79.9 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 361 hours spilling →	The Solent	43	361	down 25%	100%
East Hoathly S.T.W. Storm tank at sewage works Sewage works East Hoathly S T W Company site name EAST HOATHLY SSO - 115741 EA ID / permit SWS00270 · A01484 Outlet location TQ5210015400 (OS grid reference) · View on Apple Maps WFD catchment Bull River from Foxhunt Green to Lower Horsebridge (GB107041012380) 2024 spills / hours 67 / 750 Long-term average 43.3 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 360 hours spilling →	Trib of Glynde Reach	48	360	down 28%	100%
Upper Dicker Sewage P.S. Storm discharge at pumping station Company site name UPPER DICKER CEO - 108776 EA ID / permit SWS00895 · W00469 Outlet location TQ5558009900 (OS grid reference) · View on Apple Maps WFD catchment Cuckmere between Arlington and Lower Horsebridge (GB107041012930) 2024 spills / hours 76 / 740 Long-term average 54.6 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 360 hours spilling →	Freshwater River	47	360	down 38%	99%
Barge Lane Wootton Bridge 5 CSO Overflow on sewer network Company site name BARGE LANE WOOTTON BRIDGE OUTSIDE 5 CSO - 108506 EA ID / permit SWS00040 · A01088 Outlet location SZ5483092040 (OS grid reference) · View on Apple Maps WFD catchment WOOTTON CREEK (GB520710101900) Shellfish water Cowes and Medina; Ryde 2024 spills / hours 66 / 523 Long-term average 42.9 spills a year (monitored since 2016) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Sensor failure / issue · Resolved - Sep Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 358 hours spilling →	The Solent	46	358	down 30%	46%
Summer Lane Pagham WwTW Storm tank at sewage works Sewage works Summer Lane Pagham Company site name SUMMER LANE PAGHAM SSO - 115443 EA ID / permit SWS00640 · A01192 Outlet location SZ8827098950 (OS grid reference) · View on Apple Maps WFD catchment Pagham Harbour (GB107041012880) Bathing water Pagham 2024 spills / hours 72 / 1,195 Long-term average 50.4 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 358 hours spilling →	Pagham Rife	22	358	down 69%	99%
Penshurst WwTW Inlet overflow at sewage works Sewage works Penshurst Company site name PENSHURST CSO - 115997 EA ID / permit SWS00657 · W00026 Outlet location TQ5316043850 (OS grid reference) · View on Apple Maps WFD catchment Mid Medway from Eden Confluence to Yalding (GB106040018182) 2024 spills / hours 100 / 793 Long-term average 66.6 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 350 hours spilling →	River Medway	61	350	down 39%	100%
Lingfield WwTW Storm tank at sewage works Sewage works Lingfield Company site name LINGFIELD SSO - 115415 EA ID / permit SWS00505 · A00194 Outlet location TQ3880045040 (OS grid reference) · View on Apple Maps WFD catchment Tributary of Eden Brook (GB106040018340) 2024 spills / hours 124 / 2,110 Long-term average 79.7 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 350 hours spilling →	Ray Brook	38	350	down 69%	98%
Cranbrook WwTW Storm tank at sewage works Sewage works Cranbrook Company site name CRANBROOK SSO - 115403 EA ID / permit SWS00222 · W00497 Outlet location TQ7824036200 (OS grid reference) · View on Apple Maps WFD catchment Hammer Stream (GB106040018290) 2024 spills / hours 93 / 1,117 Long-term average 62.1 spills a year (monitored since 2016) High-spill reason (company) Performance - GW inundation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 347 hours spilling →	The Crane Brook	43	347	down 54%	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.