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
Broadstairs Headworks Storm discharge at pumping station Company site name BROADSTAIRS PS SCREENED CEO - 116106 EA ID / permit SWS00106 · A01214 Outlet location TR4335071210 (OS grid reference) · View on Apple Maps WFD catchment Kent North (GB650704510000) Bathing water Botany Bay, Broadstairs; Broadstairs, Stone Bay; Joss Bay, Broadstairs; Broadstairs, Viking Bay Shellfish water Margate 2024 spills / hours 1 / 0.2 Long-term average 1.7 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 3.0 hours spilling →	The English Channel	2	3.0	up 100%	100%
Second Ave Chatham NO1 CSO Overflow on sewer network Company site name SECOND AVENUE CHATHAM NO 1 CSO - 108725 EA ID / permit SWS00759 · A00933 Outlet location TQ7562068140 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 2 / 0.7 Long-term average 2.9 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Resolved - Nov Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 3.0 hours spilling →	River Medway Estuary	3	3.0	up 50%	79%
Broomcroft Road, Gillingham CSO Overflow on sewer network Company site name BROOMCROFT ROAD GILLINGHAM CSO - 108593 EA ID / permit SWS00114 · A00806 Outlet location TQ8270067420 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 18 / 60 Long-term average 7.7 spills a year (monitored since 2016) Monitor below 90% Comms failure / issue · Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.9 hours spilling →	The Otterham Creek	7	2.9	down 61%	78%
Alderbrook Way CSO Overflow on sewer network Company site name ALDERBROOK WAY CROWBOROUGH CSO - 103288 EA ID / permit SWS00009 · A00897 Outlet location TQ5219028750 (OS grid reference) · View on Apple Maps WFD catchment Tributary of upper Medway at Crowborough (GB106040013360) 2024 spills / hours 13 / 13 Long-term average 8.8 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.9 hours spilling →	Jarvis Brook	3	2.9	down 77%	100%
School Lane Danehill CSO Overflow on sewer network Company site name SCHOOL LANE DANEHILL CSO - 108311 EA ID / permit SWS00749 · A00033 Outlet location TQ4083027840 (OS grid reference) · View on Apple Maps WFD catchment Sheffield Park Stream (GB107041013000) 2024 spills / hours 0 / 0.0 Long-term average 1.5 spills a year (monitored since 2019) Monitor below 90% Sensor failure / issue · Resolved - Jun Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.8 hours spilling →	Trib of the River Ouze	2	2.8	up from 0	59%
South Street East Barming Ceo Storm discharge at pumping station Company site name SOUTH STREET EAST BARMING SSO - 115963 EA ID / permit SWS00793 · W00593 Outlet location TQ7238053920 (OS grid reference) · View on Apple Maps WFD catchment Medway at Maidstone (GB106040018440) 2024 spills / hours 2 / 3.5 Long-term average 1.0 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.8 hours spilling →	The River Medway	3	2.8	up 50%	100%
Mill Road / Tennyson Road Car Park Overflow on sewer network Company site name MILL ROAD YARMOUTH CSO - 108538 EA ID / permit SWS00573 · W00186 Outlet location SZ3560089670 (OS grid reference) · View on Apple Maps WFD catchment Solent (GB650705150000) Bathing water Colwell Bay Shellfish water Lymington and Sowley; Pennington; Newtown; Yarmouth 2024 spills / hours 1 / 0.6 Long-term average 1.7 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.7 hours spilling →	Western Yar Estuary	5	2.7	up 400%	100%
Gloucester Road CSO Overflow on sewer network Company site name GLOUCESTER ROAD BOGNOR CSO - 103299 EA ID / permit SWS00351 · A00734 Outlet location SZ9466099270 (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 7 / 9.3 Long-term average 5.1 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 2.7 hours spilling →	Freshwater River	3	2.7	down 57%	99%
Blackwall Road Storm discharge at pumping station Company site name BLACKWALL ROAD WILLESBOROUGH LEES CEO - 108757 EA ID / permit SWS00072 · K01508 Outlet location TR0332042950 (OS grid reference) · View on Apple Maps WFD catchment Great Stour between Ashford and Wye (GB107040019741) 2024 spills / hours 4 / 6.5 Long-term average 1.9 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.7 hours spilling →	Great Stour River	1	2.7	down 75%	100%
St Marys Lane Ticehurst CSO Overflow on sewer network Company site name ST MARYS LANE TICEHURST CSO - 108250 EA ID / permit SWS00816 · A00896 Outlet location TQ6907030050 (OS grid reference) · View on Apple Maps WFD catchment Limden (GB107040013610) 2024 spills / hours 16 / 23 Long-term average 16.8 spills a year (monitored since 2019) Monitor below 90% Sensor failure / issue · Resolved - Sep Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2.6 hours spilling →	Trib of the River Limden	3	2.6	down 81%	61%
Cross Lane East CSO Overflow on sewer network Company site name CROSS LANE EAST GRAVESEND CSO - 108704 EA ID / permit SWS00225 · CASM.0011 Outlet location TQ6481074520 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 50 / 19 Long-term average 33.8 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Scheduled Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2.6 hours spilling →	River Thames - Tidal	9	2.6	down 82%	56%
Maison Dieu Place Storm discharge at pumping station Company site name WOOD STREET DOVER CEO - 108677 EA ID / permit SWS00542 · A00919 Outlet location TR3153041910 (OS grid reference) · View on Apple Maps WFD catchment Dour from Kearsney to Dover (GB107040073310) 2024 spills / hours 0 / 0.0 Long-term average 1.2 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.6 hours spilling →	Freshwater River	1	2.6	up from 0	100%
Rectory Close Wouldham Wwps Storm discharge at pumping station Company site name RECTORY CLOSE WOULDHAM CEO - 108882 EA ID / permit SWS00699 · A01462 Outlet location TQ7122064300 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 3 / 2.4 Long-term average 1.0 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.5 hours spilling →	The River Medway Estuary	2	2.5	down 33%	100%
Cuckfield Road Overflow on sewer network Company site name CUCKFIELD ROAD HURSTPIERPOINT 112 CSO - 108218 EA ID / permit SWS00239 · W00408 Outlet location TQ2818017700 (OS grid reference) · View on Apple Maps WFD catchment Herrings Stream (GB107041012150) 2024 spills / hours 13 / 4.1 Long-term average 9.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 2.5 hours spilling →	Freshwater River	10	2.5	down 23%	99%
Luccombe Ceo Storm discharge at pumping station Company site name LUCCOMBE CEO - 110208 EA ID / permit SWS00525 · A01417 Outlet location SZ5835079670 (OS grid reference) · View on Apple Maps WFD catchment Isle of Wight East (GB650705530000) Bathing water Shanklin; Ventnor 2024 spills / hours 13 / 25 Long-term average 8.4 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.4 hours spilling →	Sandown Bay	5	2.4	down 62%	100%
Smiths Lane(Goudhurst)WwTW, Smiths Inlet overflow at sewage works Sewage works Smiths Lane Smiths Company site name SMITHS LANE GOUDHURST CSO - 116045 EA ID / permit SWS00785 · A01200 Outlet location TQ7186038160 (OS grid reference) · View on Apple Maps WFD catchment Lesser Teise (GB106040018260) 2024 spills / hours 9 / 27 Long-term average 5.4 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.4 hours spilling →	A Trib of the River Teise	3	2.4	down 67%	100%
Salterns Road Stubbington CSO Overflow on sewer network Company site name SALTERNS ROAD STUBBINGTON CSO - 108480 EA ID / permit SWS00734 · A01379 Outlet location SU5498001560 (OS grid reference) · View on Apple Maps WFD catchment Solent (GB650705150000) Bathing water Hillhead; Lee-on-Solent Shellfish water Approaches to Southampton Water; Central Solent; Cowes and Medina; Spithead and Stokes Bay 2024 spills / hours 1 / 1.8 Long-term average 0.4 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.4 hours spilling →	The Solent	1	2.4	no change	100%
Valley Road Chandlers Ford CSO Overflow on sewer network Company site name VALLEY ROAD CHANDLERS FORD CSO - 103267 EA ID / permit SWS00898 · A00320 Outlet location SU4313021320 (OS grid reference) · View on Apple Maps WFD catchment Monks Brook (GB107042016310) 2024 spills / hours 3 / 6.0 Long-term average 4.8 spills a year (monitored since 2017) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.4 hours spilling →	Tributary of the Monks Brook	4	2.4	up 33%	100%
Charlwoods Road East Grinstead CSO Overflow on sewer network Company site name CHARLWOODS ROAD EAST GRINSTEAD CSO - 108203 EA ID / permit SWS00164 · K01506 Outlet location TQ3928039450 (OS grid reference) · View on Apple Maps WFD catchment Eden Brook (GB106040018660) 2024 spills / hours 15 / 39 Long-term average 3.2 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2.4 hours spilling →	The Eden Vale Stream	3	2.4	down 80%	99%
Castle Street Cowes CSO Storm discharge at pumping station Company site name CASTLE STREET COWES CSO - 108822 EA ID / permit SWS00145 · A01298 Outlet location SZ5019095910 (OS grid reference) · View on Apple Maps WFD catchment MEDINA (GB520710101600) Bathing water Cowes; Gurnard Shellfish water Central Solent; Cowes and Medina; Spithead and Stokes Bay; Stanswood Bay 2024 spills / hours 9 / 5.0 Long-term average 7.9 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.4 hours spilling →	River Medina	9	2.4	no change	100%
Langholm Road Langton Green CSO Overflow on sewer network Company site name LANGHOLM ROAD LANGTON GREEN CSO - 109529 EA ID / permit SWS00493 · A01346 Outlet location TQ5471039600 (OS grid reference) · View on Apple Maps WFD catchment Barden Mill Stream (GB106040018100) 2024 spills / hours 8 / 8.3 Long-term average 3.9 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2.3 hours spilling →	Trib of Barden Mill Stream	4	2.3	down 50%	100%
Sheerness East W W P S Storm discharge at pumping station Company site name DROVE ROAD SHEERNESS CEO - 108727 EA ID / permit SWS00767 · A00772 Outlet location TQ9339073630 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) Bathing water Minster Leas; Sheerness Shellfish water Foulness; Outer Thames; Sheppey; Southend 2024 spills / hours 0 / 0.0 Long-term average 3.1 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.3 hours spilling →	Drainage Ditch Minster Marshes	1	2.3	up from 0	100%
Shorwell WwTW Inlet overflow at sewage works Sewage works Shorwell Company site name SHORWELL CSO - 116157 EA ID / permit SWS00771 · A00197 Outlet location SZ4492082340 (OS grid reference) · View on Apple Maps WFD catchment Brighstone Streams (GB107101005940) 2024 spills / hours 17 / 150 Long-term average 9.5 spills a year (monitored since 2017) Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2.3 hours spilling →	Shorwell Stream	1	2.3	down 94%	100%
Chalkwell Road Sittingbourne CSO Overflow on sewer network Company site name CHALKWELL ROAD SITTINGBOURNE CSO - 110227 EA ID / permit SWS00157 · A01345 Outlet location TQ9053064290 (OS grid reference) · View on Apple Maps WFD catchment SWALE (GB530604011500) Shellfish water Swale Central 2024 spills / hours 4 / 4.9 Long-term average 5.0 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Resolved - Dec Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.2 hours spilling →	A Tributary of Milton Creek	3	2.2	down 25%	77%
Wannock Rd Wannock CSO, Wannock Overflow on sewer network Company site name WANNOCK ROAD WANNOCK CSO - 109583 EA ID / permit SWS00907 · A01268 Outlet location TQ5760003590 (OS grid reference) · View on Apple Maps WFD catchment Langley Sewer at Eastbourne (GB107041006650) 2024 spills / hours 8 / 29 Long-term average 3.7 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 2.2 hours spilling →	Wannock Mill Stream	4	2.2	down 50%	100%
Ridgeway Banks Chatham CSO Overflow on sewer network Company site name RIDGEWAY BANKS CHATHAM CSO - 108873 EA ID / permit SWS00706 · A01438 Outlet location TQ7563068140 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 7 / 1.9 Long-term average 4.8 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Resolved - Nov Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.2 hours spilling →	The River Medway	4	2.2	down 43%	70%
Linstone Drive CSO Overflow on sewer network Company site name LINSTONE DRIVE NORTON IOW CSO - 103062 EA ID / permit SWS00507 · A00722 Outlet location SZ3438089350 (OS grid reference) · View on Apple Maps WFD catchment Solent (GB650705150000) Shellfish water Lymington and Sowley; Pennington 2024 spills / hours 3 / 8.0 Long-term average 2.8 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.2 hours spilling →	Unnamed Stream	4	2.2	up 33%	100%
Westcliffe Drive Minster Ios PS Q18 Storm discharge at pumping station Company site name WESTCLIFFE DRIVE MINSTER IOS CEO - 108755 EA ID / permit SWS00930 · A00265 Outlet location TQ9571073740 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) Bathing water Minster Leas Shellfish water Outer Thames 2024 spills / hours 2 / 1.4 Long-term average 3.3 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.2 hours spilling →	The North Sea	2	2.2	no change	100%
North Mundham Wps (Pagham Road) Storm discharge at pumping station Company site name PAGHAM ROAD NORTH MUNDHAM CEO - 108291 EA ID / permit SWS00612 · A01180 Outlet location SU8788002330 (OS grid reference) · View on Apple Maps WFD catchment Pagham Harbour (GB107041012880) Shellfish water Chichester Harbour (Chichester Channel) 2024 spills / hours 29 / 341 Long-term average 12.0 spills a year (monitored since 2016) Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2.2 hours spilling →	Pagham Rife	8	2.2	down 72%	100%
Second Avenue No 3 Chatham CSO Overflow on sewer network Company site name SECOND AVENUE CHATHAM NO 3 CSO - 108874 EA ID / permit SWS00761 · A01436 Outlet location TQ7562068130 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 18 / 41 Long-term average 16.8 spills a year (monitored since 2016) Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2.1 hours spilling →	River Medway Estuary	3	2.1	down 83%	96%
Three Cups Sewage P.S. Storm discharge at pumping station Company site name THREE CUPS CORNER CEO - 108362 EA ID / permit SWS00873 · W00576 Outlet location TQ6355020090 (OS grid reference) · View on Apple Maps WFD catchment Dudwell (GB107040013570) 2024 spills / hours 13 / 65 Long-term average 4.8 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.1 hours spilling →	Freshwater River	1	2.1	down 92%	99%
Cowstead Lane No 2 and 3 Outfalls Overflow on sewer network Company site name COWSTEAD LANE GILLINGHAM CEO - 102357 EA ID / permit SWS00220 · A00136 Outlet location TQ8139067910 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 0 / 0.0 Long-term average 2.9 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.1 hours spilling →	The Medway Estuary	4	2.1	up from 0	100%
Grove Road Chatham Outside 1 CSO Overflow on sewer network Company site name GROVE ROAD CHATHAM OUTSIDE 1 CSO - 108646 EA ID / permit SWS00373 · A00928 Outlet location TQ7562068140 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 1 / 0.1 Long-term average 1.6 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Resolved - Jul Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.1 hours spilling →	Medway Estuary	7	2.1	up 600%	87%
Salterns Lane Fareham Ceo Storm discharge at pumping station Company site name SALTERNS LANE FAREHAM CEO - 108851 EA ID / permit SWS00731 · A01393 Outlet location SU5812004990 (OS grid reference) · View on Apple Maps WFD catchment PORTSMOUTH HARBOUR (GB580705140000) Shellfish water Portsmouth Harbour 2024 spills / hours 1 / 3.4 Long-term average 2.6 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 2.1 hours spilling →	Portsmouth Harbour	4	2.1	up 300%	100%
Pett (Glebe Cottages) Wwps Storm discharge at pumping station Company site name GLEBE COTTAGES PETT CEO - 110663 EA ID / permit SWS00659 · A00802 Outlet location TQ8775014420 (OS grid reference) · View on Apple Maps WFD catchment Marsham and Pannel Sewers (GB107040013390) 2024 spills / hours 0 / 0.0 Long-term average 0.7 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2.0 hours spilling →	Freshwater River	1	2.0	up from 0	100%
Mill Lane Hastings CSO Overflow on sewer network Company site name MILL LANE HASTINGS CSO - 109033 EA ID / permit SWS00570 · A01082 Outlet location TQ8436012630 (OS grid reference) · View on Apple Maps WFD catchment Doleham Ditch (GB107040013380) 2024 spills / hours 6 / 27 Long-term average 2.2 spills a year (monitored since 2019) Monitor below 90% Sensor failure / issue · Resolved - Oct Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.0 hours spilling →	Unnamed Trib of Sailors Stream	2	2.0	down 67%	57%
Ancton Lane Middleton-on-Sea CSO Storm discharge at pumping station Company site name ANCTON LANE MIDDLETON ON SEA CSO - 108032 EA ID / permit SWS00017 · S01076 Outlet location SU9793000680 (OS grid reference) · View on Apple Maps WFD catchment Ryebank Rife (GB107041006620) Bathing water Felpham; Middleton-on-sea 2024 spills / hours 3 / 16 Long-term average 0.7 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 2.0 hours spilling →	Ryebank Rife/River Arun	1	2.0	down 67%	100%
Lower Rainham Road Lower Rainham PS Storm discharge at pumping station Company site name LOWER RAINHAM ROAD LOWER RAINHAM CEO - 102791 EA ID / permit SWS00518 · A00253 Outlet location TQ8270067420 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 1 / 0.3 Long-term average 3.0 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.9 hours spilling →	River Medway Estuary	2	1.9	up 100%	100%
St Lukes Road Tunbridge Wells CSO Overflow on sewer network Company site name ST LUKES ROAD TUNBRIDGE WELLS CSO - 111356 EA ID / permit SWS00813 · A01432 Outlet location TQ5922041090 (OS grid reference) · View on Apple Maps WFD catchment Somerhill Stream (GB106040018410) 2024 spills / hours 17 / 21 Long-term average 11.1 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 1.9 hours spilling →	A Trib of the Gasworks Stream	4	1.9	down 76%	100%
Augusta Road CSO Overflow on sewer network Company site name AUGUSTA ROAD RYDE CSO - 102348 EA ID / permit SWS00033 · A00760 Outlet location SZ5872092930 (OS grid reference) · View on Apple Maps WFD catchment Solent (GB650705150000) Bathing water Ryde Shellfish water Cowes and Medina; Ryde 2024 spills / hours 5 / 11 Long-term average 3.3 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.9 hours spilling →	The Solent	3	1.9	down 40%	100%
Southfield Polegate CSO E'Bourne Rd Overflow on sewer network Company site name SOUTHFIELD POLEGATE CSO - 108339 EA ID / permit SWS00800 · A01505 Outlet location TQ5823004340 (OS grid reference) · View on Apple Maps WFD catchment Langley Sewer at Eastbourne (GB107041006650) 2024 spills / hours 11 / 32 Long-term average 7.1 spills a year (monitored since 2016) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 1.9 hours spilling →	Wannock Mill Stream	8	1.9	down 27%	100%
68 Queens Road CSO Overflow on sewer network Company site name QUEENS ROAD ASHFORD OUTSIDE 68 CSO - 108688 EA ID / permit SWS00001 · A01153 Outlet location TR0152043270 (OS grid reference) · View on Apple Maps WFD catchment Great Stour between Ashford and Wye (GB107040019741) 2024 spills / hours – / – Long-term average 0.7 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.9 hours spilling →	Freshwater River	3	1.9		94%
Vicarage Road Strood Wps Storm discharge at pumping station Company site name VICARAGE ROAD STROOD CEO - 108750 EA ID / permit SWS00899 · A00263 Outlet location TQ7418069310 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 10 / 21 Long-term average 4.7 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.9 hours spilling →	River Medway Estuary	1	1.9	down 90%	100%
Cross Lane West Gravesend CSO Overflow on sewer network Company site name CROSS LANE WEST GRAVESEND CSO - 108622 EA ID / permit SWS00226 · CASM.0005 Outlet location TQ6459072790 (OS grid reference) · View on Apple Maps WFD catchment Ebbsfleet (GB106040024190) 2024 spills / hours 10 / 8.5 Long-term average 20.2 spills a year (monitored since 2016) Monitor below 90% Sensor failure / issue · Scheduled Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	Tidal River Thames	8	1.8	down 20%	68%
Hall Road Aylesford CSO Storm discharge at pumping station Company site name HALL ROAD AYLESFORD CEO - 110197 EA ID / permit SWS00386 · K02096 Outlet location TQ7264058790 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 0 / 0.0 Long-term average 2.1 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	The Medway Estuary (Tidal)	5	1.8	up from 0	100%
Gruneison Road Storm PS Overflow on sewer network Company site name STAMSHAW ROAD PORTSMOUTH CSO - 109337 EA ID / permit SWS00378 · 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 9 / 13 Long-term average 2.9 spills a year (monitored since 2016) Investigation 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 1.8 hours spilling →	Portsmouth Harbour	3	1.8	down 67%	93%
St Marys Road Gillingham CSO Overflow on sewer network Company site name ST MARYS ROAD GILLINGHAM CSO - 108735 EA ID / permit SWS00817 · EPR/DB3797RH Outlet location TQ7778069590 (OS grid reference) · View on Apple Maps WFD catchment MEDWAY (GB530604002300) 2024 spills / hours 4 / 0.7 Long-term average 3.8 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	Gillingham Reach/ Medway Est	4	1.8	no change	100%
Sky End Lane Hordle CSO Overflow on sewer network Company site name SKY END LANE HORDLE CSO - 110232 EA ID / permit SWS00780 · A01422 Outlet location SZ2783094810 (OS grid reference) · View on Apple Maps WFD catchment Avon Water (GB107042011300) Shellfish water Pennington 2024 spills / hours 0 / 0.0 Long-term average 2.4 spills a year (monitored since 2016) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	Lymore Stream	2	1.8	up from 0	95%
Cambridge Road/Brockhurst Road PS Storm discharge at pumping station Company site name CAMBRIDGE ROAD GOSPORT CEO - 108462 EA ID / permit SWS00134 · A01357 Outlet location SU6104000660 (OS grid reference) · View on Apple Maps WFD catchment PORTSMOUTH HARBOUR (GB580705140000) Bathing water Southsea East; Stokes Bay Shellfish water Central Solent; Cowes and Medina; Portsmouth Harbour; Ryde; Spithead and Stokes Bay 2024 spills / hours 5 / 8.7 Long-term average 2.6 spills a year (monitored since 2016) Investigation 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 1.8 hours spilling →	Portsmouth Harbour	3	1.8	down 40%	100%
Egypt Point PS Storm discharge at pumping station Company site name EGYPT POINT COWES CEO - 108518 EA ID / permit SWS00283 · 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 2 / 4.2 Long-term average 5.3 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.8 hours spilling →	The Solent	3	1.8	up 50%	100%

Sewage treatment works

Storm tanks and inlet overflows at each Southern Water sewage works. The figures are 2025 spills.

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