Storm overflow register · 2025 annual return

Wessex Water storm overflows, 2025

Wessex Water reported 1,346 storm overflows in England for 2025. Together they recorded 24,442 spills over 190,666 hours, an average of 18.2 spills per overflow against 20.4 across England. That ranks 6 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 45% on 2024.

220 overflows did not spill · 62 spilled more than 60 times · 1,308 had monitors working for 90% of the year or more · 242 sewage treatment works with overflows

Hours spilling by month, 2025

Hours spilling, all Wessex Water overflows, from the start/stop records. Spills running across a month end are split between the months.

All Wessex 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
Sandhill Park WwTW Storm tank at sewage works Sewage works Sandhill Park Company site name SANDHILL PARK STORM TANK EA ID / permit WXW00960 · 072535 Outlet location ST1573229142 (OS grid reference) · View on Apple Maps WFD catchment Halse WTR (GB108052021380) 2024 spills / hours 51 / 492 Long-term average 34.8 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 366 hours spilling →	Tributary of Halse Water	27	366	down 47%	100%
Watchet Sewage Treatment Works Storm tank at sewage works Sewage works Watchet Company site name WATCHET STORM TANK EA ID / permit WXW01194 · 101940 Outlet location ST0652044550 (OS grid reference) · View on Apple Maps WFD catchment Bristol Channel Inner South (GB640807670000) Bathing water Blue Anchor West 2024 spills / hours 79 / 994 Long-term average 39.2 spills a year (monitored since 2017) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 364 hours spilling →	Bristol Channel(C)	31	364	down 61%	100%
Mill Lane Combined Sewer Overflow Overflow on sewer network Company site name CORSTON MILL LANE EA ID / permit WXW00733 · 102555 Outlet location ST9240784133 (OS grid reference) · View on Apple Maps WFD catchment Gauze Bk - source to conf R Avon (Brist) (GB109053027730) 2024 spills / hours 52 / 707 Long-term average 29.3 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 364 hours spilling →	Gauze Brook	24	364	down 54%	93%
Freshford WRC Storm tank at sewage works Sewage works Freshford Company site name FRESHFORD STORM TANK EA ID / permit WXW00449 · 010037 Outlet location ST7902960599 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (Semington Bk to By Bk) (GB109053027372) 2024 spills / hours 81 / 1,060 Long-term average 37.7 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 361 hours spilling →	Bristol Avon	32	361	down 60%	100%
Lydlinch Water Recycling Centre Inlet overflow at sewage works Sewage works Lydlinch Company site name LYDLINCH INLET EA ID / permit WXW00663 · 040862 Outlet location ST7502813816 (OS grid reference) · View on Apple Maps WFD catchment Lydden (Middle) (GB108043015940) 2024 spills / hours 82 / 572 Long-term average 73.0 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 360 hours spilling →	River Lydden	59	360	down 28%	100%
East Coker STW Storm tank at sewage works Sewage works East Coker Company site name EAST COKER MOOR LANE STORM TANK EA ID / permit WXW00392 · 071196 Outlet location ST5470013030 (OS grid reference) · View on Apple Maps WFD catchment Sutton Bingham Stream - conf Closworth Str to conf Yeo (GB108052015590) 2024 spills / hours 50 / 353 Long-term average 36.6 spills a year (monitored since 2021) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 359 hours spilling →	Stoford Brook (S)	30	359	down 40%	100%
Blagdon Wastewater Treatment Works Storm tank at sewage works Sewage works Blagdon Company site name BLAGDON STORM TANK EA ID / permit WXW00145 · 070005 Outlet location ST5008160062 (OS grid reference) · View on Apple Maps WFD catchment Yeo - source to conf Congresbury Yeo (GB109052021640) 2024 spills / hours 46 / 541 Long-term average 34.3 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 355 hours spilling →	Congresbury Yeo	34	355	down 26%	100%
Wrington Water Recycling Centre Storm tank at sewage works Sewage works Wrington Company site name WRINGTON STORM TANK EA ID / permit WXW01290 · 102486 Outlet location ST4640762639 (OS grid reference) · View on Apple Maps WFD catchment Yeo - source to conf Congresbury Yeo (GB109052021640) 2024 spills / hours 57 / 996 Long-term average 49.3 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 355 hours spilling →	Trib of Congresbury Yeo(S)	24	355	down 58%	100%
Church Road CSO Overflow on sewer network Company site name FRAMPTON COTTERELL ST PETERS CHURCH (NW) CHURCH ROAD EA ID / permit WXW00284 · 103070 Outlet location ST6676181904 (OS grid reference) · View on Apple Maps WFD catchment Frome (Brist) - conf Laddon Bk to conf Folly Bk (GB109053027820) 2024 spills / hours 123 / 1,691 Long-term average 76.0 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement completed, UWWTR improvement completed Volume & pollution Estimate from 355 hours spilling →	River Frome	32	355	down 74%	100%
Sandford Orcas WRC Inlet overflow at sewage works Sewage works Sandford Orcas Company site name SANDFORD ORCAS STW EA ID / permit WXW00959 · 102523 Outlet location ST6181921542 (OS grid reference) · View on Apple Maps WFD catchment Corton Denham Stream (GB108052015620) 2024 spills / hours 41 / 547 Long-term average 23.8 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 353 hours spilling →	Tributary of River Yeo	31	353	down 24%	100%
Doniford Pumping Station Storm discharge at pumping station Company site name DONIFORD EA ID / permit WXW00370 · 101941 Outlet location ST0874044010 (OS grid reference) · View on Apple Maps WFD catchment Bridgwater Bay (GB670807410000) Bathing water Blue Anchor West 2024 spills / hours 42 / 592 Long-term average 28.8 spills a year (monitored since 2017) Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Operational improvement completed Volume & pollution Estimate from 351 hours spilling →	Bristol Channel (C)	24	351	down 43%	100%
Merriott Wastewater Treatment Works Storm tank at sewage works Sewage works Merriott Company site name MERRIOTT B3165 STORM TANK EA ID / permit WXW00716 · 102289 Outlet location ST4523012810 (OS grid reference) · View on Apple Maps WFD catchment Merriot Stream (GB108052015290) 2024 spills / hours 56 / 704 Long-term average 42.3 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 351 hours spilling →	Trib of Goulds Brook	31	351	down 45%	100%
Porlock Wastewater Treatment Works Storm tank at sewage works Sewage works Porlock Company site name PORLOCK SPARKHAYES LANE STORM TANK EA ID / permit WXW00872 · 100318 Outlet location SS8835048300 (OS grid reference) · View on Apple Maps WFD catchment Hawcombe STR (GB108051020300) Bathing water Porlock Weir 2024 spills / hours 29 / 476 Long-term average 35.2 spills a year (monitored since 2017) Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 349 hours spilling →	Porlock Bay Hawkcombestream(C)	28	349	down 3%	100%
Shoscombe Water Recycling Centre Storm tank at sewage works Sewage works Shoscombe Company site name SHOSCOMBE STORM TANK EA ID / permit WXW00992 · 010080 Outlet location ST7168755846 (OS grid reference) · View on Apple Maps WFD catchment Wellow Bk - Snails Bk to Bristol Avon (GB109053022271) 2024 spills / hours 101 / 717 Long-term average 29.4 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 342 hours spilling →	Wellow Brook	41	342	down 59%	100%
South Perrott WwTW Storm tank at sewage works Sewage works South Perrott Company site name SOUTH PERROTT NEAR PIPPLEPEN FARM STORM TANK EA ID / permit WXW01014 · 071228 Outlet location ST4701507400 (OS grid reference) · View on Apple Maps WFD catchment Parrett - headwaters to Broad River (GB108052015260) 2024 spills / hours 39 / 242 Long-term average 54.6 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 341 hours spilling →	River Parrett	37	341	down 5%	100%
Priory Storm Tanks Other storm discharge asset type Company site name TAUNTON PRIORY STORM TANKS STORM TANKS EA ID / permit WXW00892 · 102258 Outlet location ST2360025410 (OS grid reference) · View on Apple Maps WFD catchment Tone Ds Taunton (GB108052015482) 2024 spills / hours 59 / 644 Long-term average 49.8 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 336 hours spilling →	River Tone(S)	33	336	down 44%	100%
Sydling St Nicholas Pumping Station Storm discharge at pumping station Company site name SYDLING ST NICHOLAS EA ID / permit WXW01099 · 401196 Outlet location SY6322798911 (OS grid reference) · View on Apple Maps WFD catchment Sydling Water (GB108044009700) 2024 spills / hours 31 / 365 Long-term average 19.5 spills a year (monitored since 2020) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 336 hours spilling →	Tributary of Sydling Water	16	336	down 48%	100%
North Cadbury Water Recycling Centr Storm tank at sewage works Sewage works North Cadbury Water Recycling Centr Company site name NORTH CADBURY RIDGEWAY LANE STORM TANK EA ID / permit WXW00800 · 102410 Outlet location ST6287027309 (OS grid reference) · View on Apple Maps WFD catchment Cam - Upper (GB108052015690) 2024 spills / hours 110 / 1,518 Long-term average 75.8 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 335 hours spilling →	River Cam	44	335	down 60%	100%
Ilton Water Recycling Centre Inlet overflow at sewage works Sewage works Ilton Company site name ILTON ASHFORD FARM (NEAR) INLET EA ID / permit WXW00580 · 072493 Outlet location ST3578018530 (OS grid reference) · View on Apple Maps WFD catchment Isle - Cad Bk to Fivehead River (GB108052015220) 2024 spills / hours 62 / 468 Long-term average 55.0 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 335 hours spilling →	Tributary of the River Isle	50	335	down 19%	100%
Sturminster Newton WRC Storm tank at sewage works Sewage works Sturminster Newton Company site name STURMINSTER NEWTON OPP RIXON CLOSE STORM TANK EA ID / permit WXW01084 · NPSWQD008026 Outlet location ST7996413981 (OS grid reference) · View on Apple Maps WFD catchment Stour (Middle u/s Pimperne Brook) (GB108043016051) 2024 spills / hours 39 / 569 Long-term average 30.7 spills a year (monitored since 2023) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 335 hours spilling →	River Stour	22	335	down 44%	100%
Great Somerford WwTW Storm tank at sewage works Sewage works Great Somerford Company site name GREAT SOMERFORD STORM TANK EA ID / permit WXW00480 · 102840 Outlet location ST9647083213 (OS grid reference) · View on Apple Maps WFD catchment Avon (Brist) conf Tetbury Avon to conf R Marden (GB109053027650) 2024 spills / hours 95 / 820 Long-term average 56.4 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 334 hours spilling →	River Avon(S)	52	334	down 45%	100%
Ringwood Sewage Treatment Works Storm tank at sewage works Sewage works Ringwood Company site name RINGWOOD HAMPSHIRE HATCHES LANE STORM TANK EA ID / permit WXW00929 · 402536 Outlet location SU1445203396 (OS grid reference) · View on Apple Maps WFD catchment Hampshire Avon (Lower) (GB108043015842) 2024 spills / hours 81 / 1,339 Long-term average 54.2 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement UWWTR improvement ongoing Volume & pollution Estimate from 324 hours spilling →	Hampshire Avon River	23	324	down 72%	100%
Minehead Sewage Treatment Works Storm tank at sewage works Sewage works Minehead Company site name MINEHEAD HEADWORKS STORM TANK EA ID / permit WXW00744 · 100386 Outlet location SS9945046970 (OS grid reference) · View on Apple Maps WFD catchment Bristol Channel Inner South (GB640807670000) Bathing water Minehead Terminus 2024 spills / hours 45 / 286 Long-term average 36.8 spills a year (monitored since 2017) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 321 hours spilling →	(C) Bristol Channel	32	321	down 29%	100%
Gillingham Water Recycling Centre Storm tank at sewage works Sewage works Gillingham Company site name GILLINGHAM COMMON MEAD LANE STORM TANK EA ID / permit WXW00461 · 401739 Outlet location ST8065425973 (OS grid reference) · View on Apple Maps WFD catchment Stour (Headwaters) (GB108043022490) 2024 spills / hours 76 / 673 Long-term average 63.2 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement UWWTR improvement ongoing Volume & pollution Estimate from 319 hours spilling →	River Stour (Upper)	35	319	down 54%	100%
Langford Lane Pumping Station Storm discharge at pumping station Company site name NORTON FITZWARREN LANGFORD LANE EA ID / permit WXW00615 · 101807 Outlet location ST2019027010 (OS grid reference) · View on Apple Maps WFD catchment Back Stream (GB108052021390) Bathing water River Tone at French Weir Park 2024 spills / hours 62 / 1,158 Long-term average 58.3 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 318 hours spilling →	Trib of River Tone (S)	23	318	down 63%	100%
London Road Bus Depot CSO Overflow on sewer network Company site name BATH KENSINGTON MEADOWS BUS DEPOT STORM TANK EA ID / permit WXW00635 · 100677 Outlet location ST7568065810 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 66 / 726 Long-term average 43.6 spills a year (monitored since 2017) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 318 hours spilling →	River Avon	31	318	down 53%	100%
South Petherton STW Storm tank at sewage works Sewage works South Petherton Company site name SOUTH PETHERTON NORTH STREET STORM TANK EA ID / permit WXW01015 · 102511 Outlet location ST4308017410 (OS grid reference) · View on Apple Maps WFD catchment Lam Brook (GB108052015340) 2024 spills / hours 61 / 683 Long-term average 46.0 spills a year (monitored since 2022) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 318 hours spilling →	North Mills Brook(S)	33	318	down 46%	100%
Wedmore Water Recycling Centre Storm tank at sewage works Sewage works Wedmore Company site name WEDMORE STORM TANK EA ID / permit WXW01201 · 072054 Outlet location ST4391148071 (OS grid reference) · View on Apple Maps WFD catchment Axe - Cocklake to Brean Cross Sluice (GB109052021570) 2024 spills / hours 66 / 753 Long-term average 41.4 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 317 hours spilling →	Trib of Landcourse Rhyne	32	317	down 52%	100%
Raf Lyneham WwTW Storm tank at sewage works Sewage works Raf Lyneham Company site name LYNEHAM B SITE (MAIN STW) RAF LYNEHAM STORM TANK EA ID / permit WXW00915 · 100854 Outlet location SU0272477764 (OS grid reference) · View on Apple Maps WFD catchment Cowage Bk - source to conf unnamed trib (GB109053027640) 2024 spills / hours 53 / 735 Long-term average 34.8 spills a year (monitored since 2020) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 316 hours spilling →	Springs Watercourse	24	316	down 55%	100%
South Street CSO Overflow on sewer network Company site name BRIDPORT SOUTH STREET DEPOT EA ID / permit WXW01016 · 402084 Outlet location SY4645092280 (OS grid reference) · View on Apple Maps WFD catchment Brit (Upper) (GB108044009600) 2024 spills / hours 76 / 533 Long-term average 57.4 spills a year (monitored since 2019) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 315 hours spilling →	River Brit	58	315	down 24%	94%
Downton Sewage Treatment Works Storm tank at sewage works Sewage works Downton Company site name DOWNTON MOOT LANE STORM TANK EA ID / permit WXW00379 · 041354 Outlet location SU1741420421 (OS grid reference) · View on Apple Maps WFD catchment Hampshire Avon (Middle) (GB108043015841) 2024 spills / hours 99 / 989 Long-term average 59.4 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 309 hours spilling →	Hampshire Avon, River	31	309	down 69%	100%
Melksham WwTW Storm tank at sewage works Sewage works Melksham Company site name MELKSHAM STORM TANK EA ID / permit WXW00708 · 101886 Outlet location ST8978063760 (OS grid reference) · View on Apple Maps WFD catchment Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440) 2024 spills / hours 52 / 970 Long-term average 36.0 spills a year (monitored since 2024) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 308 hours spilling →	River Avon	20	308	down 62%	100%
New Cog Mill CSO Overflow on sewer network Company site name IRON ACTON HOOVERS LANE EA ID / permit WXW00786 · 100985 Outlet location ST6694083180 (OS grid reference) · View on Apple Maps WFD catchment Frome (Brist) - source to conf Laddon Bk (GB109053027560) 2024 spills / hours 91 / 805 Long-term average 65.5 spills a year (monitored since 2024) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 306 hours spilling →	(S) River Frome	44	306	down 52%	100%
Weymouth Water Recycling Centre Inlet overflow at sewage works Sewage works Weymouth Company site name WEYMOUTH INLET EA ID / permit WXW01244 · 400622 Outlet location SY6613074360 (OS grid reference) · View on Apple Maps WFD catchment Lyme Bay East (GB620806560000) 2024 spills / hours 89 / 463 Long-term average 77.0 spills a year (monitored since 2020) High-spill reason (company) Data collection - EDM non-representative location Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 303 hours spilling →	(C) English Channel	65	303	down 27%	100%
Stambridge CSO Overflow on sewer network Company site name BATHEASTON COALPIT ROAD JUNCTION WITH LONDON ROAD EA ID / permit WXW01048 · 021480 Outlet location ST7805467414 (OS grid reference) · View on Apple Maps WFD catchment St Catherines Bk - source to conf R Avon (Brist) (GB109053027810) 2024 spills / hours 80 / 764 Long-term average 48.7 spills a year (monitored since 2019) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 300 hours spilling →	St. Catherines Brook	50	300	down 38%	100%
Havyatt Pumping Station Storm discharge at pumping station Company site name WEST PENNARD HAVYATT EA ID / permit WXW00512 · 102369 Outlet location ST5389038120 (OS grid reference) · View on Apple Maps WFD catchment Hartlake (GB108052021171) 2024 spills / hours 61 / 712 Long-term average 37.5 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 298 hours spilling →	Trib of River Brue(S)	25	298	down 59%	100%
Long Dean Wastewater Treatment Work Inlet overflow at sewage works Sewage works Long Dean Wastewater Treatment Work Company site name LONG DEAN INLET EA ID / permit WXW00639 · 010054 Outlet location ST8478475624 (OS grid reference) · View on Apple Maps WFD catchment By Brook (Broadmead Bk to Doncombe Bk) (GB109053027480) 2024 spills / hours 88 / 1,236 Long-term average 64.0 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 292 hours spilling →	By Brook	58	292	down 34%	100%
Templecombe STW Storm tank at sewage works Sewage works Templecombe Company site name TEMPLECOMBE STORM TANK EA ID / permit WXW01108 · 040093 Outlet location ST7143222775 (OS grid reference) · View on Apple Maps WFD catchment Bow Brook North (GB108043015820) 2024 spills / hours 62 / 575 Long-term average 52.3 spills a year (monitored since 2023) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 288 hours spilling →	Tributary of Bow Brook North	31	288	down 50%	100%
Tanners Bridge Pumping Station Storm discharge at pumping station Company site name MALMESBURY TANNERS BRIDGE EA ID / permit WXW01102 · 103784 Outlet location ST9581187802 (OS grid reference) · View on Apple Maps WFD catchment Charlton Str - source to conf Bristol Avon (GB109053027770) 2024 spills / hours 71 / 938 Long-term average 32.4 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 288 hours spilling →	Charlton Stream	24	288	down 66%	100%
Yeovil (Pen Mill) WwTW Storm tank at sewage works Sewage works Yeovil Company site name YEOVIL SHERBORNE ROAD (PEN MILL) STORM TANK EA ID / permit WXW01293 · 101331 Outlet location ST5736616247 (OS grid reference) · View on Apple Maps WFD catchment Yeo Us Over Compton (GB108052015681) 2024 spills / hours 31 / 299 Long-term average 30.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 280 hours spilling →	River Yeo	29	280	down 6%	100%
Over Stratton STW Storm tank at sewage works Sewage works Over Stratton Company site name OVER STRATTON OFF SOUTH HARP STORM TANK EA ID / permit WXW00834 · 070085 Outlet location ST4394314714 (OS grid reference) · View on Apple Maps WFD catchment Lopen Brook (GB108052015330) 2024 spills / hours 52 / 369 Long-term average 39.4 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 280 hours spilling →	Lopen Brook (S)	28	280	down 46%	98%
Shaw C of E School CSO Overflow on sewer network Company site name MELKSHAM SHAW C OF E SCHOOL PLAYING FIELD EA ID / permit WXW00980 · 102811 Outlet location ST8879665886 (OS grid reference) · View on Apple Maps WFD catchment South Bk - source to conf R Avon (Brist) (GB109053021930) 2024 spills / hours 79 / 712 Long-term average 62.1 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 278 hours spilling →	South Brook	40	278	down 49%	100%
Charlton Adam Pumping Station Storm discharge at pumping station Company site name CHARLTON ADAM EA ID / permit WXW00251 · 101604 Outlet location ST5419728840 (OS grid reference) · View on Apple Maps WFD catchment Cary - source to conf with KSD (GB108052015140) 2024 spills / hours 50 / 550 Long-term average 29.4 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 277 hours spilling →	Trib of the River Cary	23	277	down 54%	100%
Moor Lane Combined Sewer Overflow Overflow on sewer network Company site name EAST COKER MOOR LANE EA ID / permit WXW00753 · 102259 Outlet location ST5409812852 (OS grid reference) · View on Apple Maps WFD catchment Sutton Bingham Stream - conf Closworth Str to conf Yeo (GB108052015590) 2024 spills / hours 68 / 298 Long-term average 54.4 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 276 hours spilling →	Tributary of River Yeo	52	276	down 24%	100%
Pumping Station at Olveston Storm discharge at pumping station Company site name OLVESTON THE COMMON EA ID / permit WXW00827 · 101837 Outlet location ST5986687304 (OS grid reference) · View on Apple Maps WFD catchment Chestle Pill (GB109054026650) 2024 spills / hours 57 / 900 Long-term average 43.0 spills a year (monitored since 2023) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 276 hours spilling →	Olveston Common Rhine	17	276	down 70%	100%
Castle Cary Water Recycling Centre Storm tank at sewage works Sewage works Castle Cary Company site name CASTLE CARY NEAR DIMMER STORM TANK EA ID / permit WXW00232 · 071220 Outlet location ST6269231831 (OS grid reference) · View on Apple Maps WFD catchment Cary - source to conf with KSD (GB108052015140) 2024 spills / hours 95 / 1,352 Long-term average 41.3 spills a year (monitored since 2020) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 274 hours spilling →	River Cary	22	274	down 77%	100%
Dilton Marsh STW Inlet overflow at sewage works Sewage works Dilton Marsh Company site name DILTON MARSH INLET EA ID / permit WXW00367 · 010032 Outlet location ST8392050090 (OS grid reference) · View on Apple Maps WFD catchment Tributary - source to conf Biss Bk (GB109053021760) 2024 spills / hours 65 / 632 Long-term average 56.0 spills a year (monitored since 2023) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 274 hours spilling →	Fairbourne Stream (S)	31	274	down 52%	100%
Windsor Court CSO Overflow on sewer network Company site name BATH WINDSOR COURT EA ID / permit WXW01267 · 102277 Outlet location ST7344364979 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 45 / 657 Long-term average 22.7 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 271 hours spilling →	River Avon	22	271	down 51%	100%
Ditcheat Wastewater Treatment Works Storm tank at sewage works Sewage works Ditcheat Company site name DITCHEAT STORM TANK EA ID / permit WXW00368 · 102408 Outlet location ST6283835114 (OS grid reference) · View on Apple Maps WFD catchment Alham (GB108052021160) 2024 spills / hours 81 / 931 Long-term average 62.9 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 269 hours spilling →	River Alham	26	269	down 68%	100%
Sodom Lane Pumping Station Storm discharge at pumping station Company site name MARNHULL SODOM LANE EA ID / permit WXW01003 · 402474 Outlet location ST7886019380 (OS grid reference) · View on Apple Maps WFD catchment Stour (Middle u/s Pimperne Brook) (GB108043016051) 2024 spills / hours 55 / 520 Long-term average 37.3 spills a year (monitored since 2019) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 268 hours spilling →	The Chivricks Brook	31	268	down 44%	100%

Sewage treatment works

Storm tanks and inlet overflows at each Wessex 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.