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
Hungerford Road CSO Overflow on sewer network Company site name BATH HUNGERFORD ROAD / UPPER BRISTOL ROAD JUNCTION EA ID / permit WXW00569 · 010911 Outlet location ST7347065006 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 11 / 2.1 Long-term average 3.3 spills a year (monitored since 2019) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 0.4 hours spilling →	River Avon	3	0.4	down 73%	97%
College Street CSO Overflow on sewer network Company site name SALISBURY COLLEGE STREET NO 28 EA ID / permit WXW00310 · 041303 Outlet location SU1513029410 (OS grid reference) · View on Apple Maps WFD catchment Hampshire Avon (Middle) (GB108043015841) 2024 spills / hours 3 / 0.4 Long-term average 3.5 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	River Avon via SWS	4	0.4	up 33%	100%
Poole - Alder Road Opp 180 - Combined Sewer Overflow Overflow on sewer network EA ID / permit WXW01344 · Unpermitted Outlet location SZ0604592491 (OS grid reference) · View on Apple Maps WFD catchment Bourne Stream (GB108044009570) 2024 spills / hours – / – Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	The Bourne	1	0.4		100%
Hill Street Combined Sewer Overflow Overflow on sewer network Company site name BRISTOL KINGSWOOD HILL STREET EA ID / permit WXW00537 · 101749 Outlet location ST6672572837 (OS grid reference) · View on Apple Maps WFD catchment Siston Bk - source to conf R Avon (Brist) (GB109053027450) 2024 spills / hours 52 / 115 Long-term average 11.7 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	Siston Brook via SWS	6	0.4	down 88%	100%
Kennel Batch CSO Overflow on sewer network Company site name WOOKEY HOLE KENNEL BATCH / HIGH STREET EA ID / permit WXW00588 · 102374 Outlet location ST5313247317 (OS grid reference) · View on Apple Maps WFD catchment Axe - source to Cocklake (GB109052021520) 2024 spills / hours 9 / 17 Long-term average 6.5 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	Trib of River Axe via SWS	4	0.4	down 56%	100%
Tugela Road CSO Overflow on sewer network Company site name BRISTOL TUGELA ROAD O/S NO 18 EA ID / permit WXW01159 · 101825 Outlet location ST5724069020 (OS grid reference) · View on Apple Maps WFD catchment The Malago - source to conf R Avon (Brist New Cut) (GB109053021970) 2024 spills / hours 3 / 0.2 Long-term average 1.4 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	The Malago (via SWS)	2	0.4	down 33%	100%
Mill Lane Combined Sewer Overflow Overflow on sewer network Company site name BRISTOL WARMLEY MILL LANE AT REAR EA ID / permit WXW00731 · 101763 Outlet location ST6703372385 (OS grid reference) · View on Apple Maps WFD catchment Siston Bk - source to conf R Avon (Brist) (GB109053027450) 2024 spills / hours 2 / 1.2 Long-term average 9.6 spills a year (monitored since 2019) Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	Siston Brook (S)	4	0.4	up 100%	100%
Swanage Tunnel Overflow on sewer network Company site name SWANAGE MARINE PARADE 1 EA ID / permit WXW01095 · 400785 Outlet location SZ0323578743 (OS grid reference) · View on Apple Maps WFD catchment Dorset / Hampshire (GB620705550000) Bathing water Swanage Central 2024 spills / hours 1 / 2.4 Long-term average 1.3 spills a year (monitored since 2017) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.4 hours spilling →	Swanage Bay	1	0.4	no change	100%
Bournemouth - Cranleigh Road - Combined Sewer Overflow Overflow on sewer network EA ID / permit WXW01317 · Unpermitted Outlet location SZ1465892514 (OS grid reference) · View on Apple Maps WFD catchment CHRISTCHURCH HARBOUR (GB520804315900) Bathing water Christchurch Avon Beach; Christchurch Friar`s Cliff 2024 spills / hours – / – Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	River Stour	1	0.4		100%
High Street CSO Overflow on sewer network Company site name PORTLAND HIGH STREET EA ID / permit WXW00531 · 041274 Outlet location SY6838473264 (OS grid reference) · View on Apple Maps WFD catchment Lyme Bay East (GB620806560000) 2024 spills / hours 17 / 2.6 Long-term average 16.8 spills a year (monitored since 2018) Monitor below 90% No longer operational as an overflow - permit revoked or to be revoked · Overflow no longer spilling to environment - from Apr Investigation Env Act (SODRP) investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 0.3 hours spilling →	West Bay (Coastal)	5	0.3	down 71%	100%
170 New Cheltenham Road CSO Overflow on sewer network Company site name BRISTOL KINGSWOOD NEW CHELTENHAM ROAD NO 170 EA ID / permit WXW00011 · 100889 Outlet location ST6632074370 (OS grid reference) · View on Apple Maps WFD catchment Siston Bk - source to conf R Avon (Brist) (GB109053027450) 2024 spills / hours 37 / 47 Long-term average 49.0 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	Warmley Brook via SWS	1	0.3	down 97%	100%
Wellsway Combined Sewer Overflow Overflow on sewer network Company site name BATH WELLSWAY JNC MILTON AVE EA ID / permit WXW01210 · 103900 Outlet location ST7385064670 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 7 / 0.8 Long-term average 6.5 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	A Culverted Trib of River Avon	6	0.3	down 14%	100%
Oakwood Road CSO Overflow on sewer network Company site name BRISTOL OAKWOOD ROAD O/S NO 21 EA ID / permit WXW00820 · 100475 Outlet location ST5801977358 (OS grid reference) · View on Apple Maps WFD catchment Trym - source to conf R Avon (Brist) (GB109053027530) 2024 spills / hours 1 / 0.1 Long-term average 2.0 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	Trib of River Trym via SWS	5	0.3	up 400%	100%
CSO at 97 High Street Overflow on sewer network Company site name FORDINGTON HIGH STREET NO 97 EA ID / permit WXW00350 · 400682 Outlet location SY7005090550 (OS grid reference) · View on Apple Maps WFD catchment Frome Dorset (Lower) u/s Louds Mill Dorchester (GB108044009691) 2024 spills / hours 2 / 0.5 Long-term average 1.1 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	(S) Mill Stream	1	0.3	down 50%	100%
Green Spot CSO Overflow on sewer network Company site name MINEHEAD GREEN SPOT EA ID / permit WXW00485 · 101775 Outlet location SS9727047320 (OS grid reference) · View on Apple Maps WFD catchment Bristol Channel Inner South (GB640807670000) Bathing water Minehead Terminus 2024 spills / hours 1 / 0.2 Long-term average 0.8 spills a year (monitored since 2017) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.3 hours spilling →	Bristol Channel (C)	1	0.3	no change	100%
Lymore Gardens CSO Overflow on sewer network Company site name BATH LYMORE GARDENS O/S NO 15 ADJ LAUNDRY EA ID / permit WXW00664 · 101931 Outlet location ST7343064930 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 2 / 1.1 Long-term average 0.9 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	River Avon(S)	2	0.3	no change	100%
Marlborough Street CSO Overflow on sewer network Company site name BRISTOL NURSING SCHOOL MARLBOROUGH STREET EA ID / permit WXW00687 · 101087 Outlet location ST5918473222 (OS grid reference) · View on Apple Maps WFD catchment Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840) 2024 spills / hours 4 / 0.5 Long-term average 3.2 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.3 hours spilling →	River Frome	2	0.3	down 50%	100%
East Bridge Combined Sewer Overflow Overflow on sewer network Company site name BRIDPORT EAST BRIDGE EA ID / permit WXW00388 · 402081 Outlet location SY4705492852 (OS grid reference) · View on Apple Maps WFD catchment Asker (GB108044009580) 2024 spills / hours 4 / 0.6 Long-term average 3.2 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.3 hours spilling →	River Asker(S)	2	0.3	down 50%	100%
Whitby Road Combined Sewer Overflow Overflow on sewer network Company site name BRISTOL WHITBY ROAD NEAR BLOOMFIELD ROAD EA ID / permit WXW01247 · 100588/CS/01 Outlet location ST6113871930 (OS grid reference) · View on Apple Maps WFD catchment Not part of a river WB catchment 2024 spills / hours 3 / 1.6 Long-term average 0.7 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	River Avon via SWS (Estuarine)	1	0.3	down 67%	100%
Swanage Tunnel Overflow on sewer network Company site name SWANAGE MARINE PARADE 2 EA ID / permit WXW01096 · 400785 Outlet location SZ0321678753 (OS grid reference) · View on Apple Maps WFD catchment Dorset / Hampshire (GB620705550000) Bathing water Swanage Central 2024 spills / hours 1 / 2.4 Long-term average 1.0 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.3 hours spilling →	Swanage Bay	1	0.3	no change	100%
Filwood Road No.2 CSO Overflow on sewer network Company site name BRISTOL PARNALLS FACTORY EA ID / permit WXW00428 · 101282 Outlet location ST6238075800 (OS grid reference) · View on Apple Maps WFD catchment Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840) 2024 spills / hours 14 / 20 Long-term average 10.0 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.2 hours spilling →	Fishponds Brook (S)	2	0.2	down 86%	96%
Longcroft Road CSO Overflow on sewer network Company site name WEYMOUTH LONGCROFT ROAD / QUEENSLAND ROAD EA ID / permit WXW00644 · 400902 Outlet location SY6758078730 (OS grid reference) · View on Apple Maps WFD catchment WEY (GB510804415700) Shellfish water Portland Harbour East; Portland Harbour West 2024 spills / hours 5 / 0.5 Long-term average 4.3 spills a year (monitored since 2017) Monitor below 90% Telemetry or data archiving failure / issue · Scheduled Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Weymouth Harbour(E)	1	0.2	down 80%	62%
Rockcliffe Avenue CSO Overflow on sewer network Company site name BATH HAMPTON ROW / ROCKLIFFE AVENUE R/O (NR BATHS) EA ID / permit WXW00931 · 010850 Outlet location ST7586765808 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 6 / 56 Long-term average 2.7 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	River Avon	1	0.2	down 83%	100%
Station Mills CSO Overflow on sewer network Company site name WELLINGTON RELYON FACTORY ENTRANCE EA ID / permit WXW01054 · 013463 Outlet location ST1309022090 (OS grid reference) · View on Apple Maps WFD catchment Tone - Wellington to Taunton (GB108052015481) 2024 spills / hours 2 / 0.4 Long-term average 2.0 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	River Tone via SWS	2	0.2	no change	100%
223 Haycombe Drive Overflow on sewer network Company site name BATH HAYCOMBE DRIVE NO 223 IN BACK GARDEN EA ID / permit WXW00018 · NPSWQD008608 Outlet location ST7292164760 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 0 / 0.0 Long-term average 1.0 spills a year (monitored since 2023) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	The River Avon via SWS	2	0.2	up from 0	100%
Weston-Super-Mare Greenfield Place O/S 15 Overflow on sewer network EA ID / permit WXW01311 · Unpermitted Outlet location ST3145161883 (OS grid reference) · View on Apple Maps WFD catchment Bristol Channel Inner South (GB640807670000) Bathing water Weston-super-Mare Uphill Slipway; Weston Main 2024 spills / hours 0 / 0.0 Long-term average 0.2 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Weston Bay (E)	1	0.2	up from 0	94%
Rockside Drive CSO Overflow on sewer network Company site name BRISTOL ROCKSIDE DRIVE O/S NO 2 EA ID / permit WXW00933 · 100474 Outlet location ST5801877357 (OS grid reference) · View on Apple Maps WFD catchment Trym - source to conf R Avon (Brist) (GB109053027530) 2024 spills / hours 2 / 0.1 Long-term average 1.8 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Tributary of River Trym via Sw	4	0.2	up 100%	100%
Bedminster Road Cycle Track CSO Overflow on sewer network Company site name BRISTOL BEDMINSTER ROAD CYCLE TRACK EA ID / permit WXW00122 · 101670 Outlet location ST5848570885 (OS grid reference) · View on Apple Maps WFD catchment The Malago - source to conf R Avon (Brist New Cut) (GB109053021970) 2024 spills / hours 0 / 0.0 Long-term average 0.5 spills a year (monitored since 2022) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	The Malago	2	0.2	up from 0	100%
Old Street CSO, Clevedon Overflow on sewer network Company site name CLEVEDON OLD STREET O/S 46 EA ID / permit WXW00825 · 102297 Outlet location ST4116071220 (OS grid reference) · View on Apple Maps WFD catchment Land Yeo - Yearling Ditch to mouth (GB109052027321) 2024 spills / hours 0 / 0.0 Long-term average 0.5 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Land Yeo (S)	1	0.2	up from 0	100%
Portland Bill Storm Overflow Storm discharge at pumping station Company site name PORTLAND BILL EA ID / permit WXW00877 · 402219 Outlet location SY6777368276 (OS grid reference) · View on Apple Maps WFD catchment Dorset / Hampshire (GB620705550000) Shellfish water Portland Harbour East; Portland Harbour West 2024 spills / hours 3 / 1.8 Long-term average 40.8 spills a year (monitored since 2017) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	English Channel(C)	3	0.2	no change	100%
Westway Precinct Car Park CSO Overflow on sewer network Company site name FROME WESTWAY PRECINCT CAR PARK R/O EA ID / permit WXW01242 · 021332 Outlet location ST7763948191 (OS grid reference) · View on Apple Maps WFD catchment Frome (Maiden Bradley to Mells) (GB109053022101) 2024 spills / hours 2 / 0.3 Long-term average 25.3 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	River Frome	3	0.2	up 50%	100%
Stoke Road Combined Sewer Overflow Overflow on sewer network Company site name TAUNTON STOKE ROAD O/S 15 EA ID / permit WXW01070 · EPRJB3798VJ Outlet location ST2391723478 (OS grid reference) · View on Apple Maps WFD catchment Broughton Brook (South and West Somerset) (GB108052015420) 2024 spills / hours 5 / 0.8 Long-term average 5.0 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.2 hours spilling →	Black Brook	2	0.2	down 60%	100%
Frome Road Combined Sewer Overflow Overflow on sewer network Company site name RADSTOCK FROME ROAD EA ID / permit WXW00452 · 013128 Outlet location ST6921154871 (OS grid reference) · View on Apple Maps WFD catchment Wellow Bk - Snails Bk to Bristol Avon (GB109053022271) 2024 spills / hours 6 / 2.5 Long-term average 1.8 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Wellow Brook	1	0.2	down 83%	100%
Wardcliffe Road CSO Overflow on sewer network Company site name WEYMOUTH WARDCLIFFE ROAD EA ID / permit WXW01188 · 400898 Outlet location SY6758078730 (OS grid reference) · View on Apple Maps WFD catchment WEY (GB510804415700) 2024 spills / hours 0 / 0.0 Long-term average 0.2 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	Weymouth Harbour(E)	1	0.2	up from 0	100%
Glebe Road Pumping Station Storm discharge at pumping station Company site name LYTCHETT MATRAVERS GLEBE ROAD EA ID / permit WXW00466 · 041152 Outlet location SY9460994244 (OS grid reference) · View on Apple Maps WFD catchment Sherford River (GB108044010100) 2024 spills / hours 4 / 5.5 Long-term average 7.6 spills a year (monitored since 2021) Monitor below 90% Telemetry or data archiving failure / issue · Resolved - Feb Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 0.1 hours spilling →	Trib of Sherford River	1	0.1	down 75%	88%
Englishcombe Lane CSO Overflow on sewer network Company site name BATH ENGLISHCOMBE LANE / STIRTINGDALE ROAD JUNCTION EA ID / permit WXW00407 · 102605 Outlet location ST7343164926 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 13 / 1.6 Long-term average 7.7 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	River Avon via SWS	3	0.1	down 77%	93%
Hendford Lodge Medical Centre CSO Overflow on sewer network Company site name YEOVIL HENFORD O/S HEALTH CENTRE EA ID / permit WXW00520 · 103570 Outlet location ST5530915447 (OS grid reference) · View on Apple Maps WFD catchment Dodham Brook (Yeo (Somset)) (GB108052015600) 2024 spills / hours 4 / 0.6 Long-term average 4.8 spills a year (monitored since 2022) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Dodham Brook via SWS	1	0.1	down 75%	94%
New Road CSO Overflow on sewer network Company site name SHAFTESBURY NEW ROAD/ WOOLANDS LANE EA ID / permit WXW00792 · 401299 Outlet location ST8575723374 (OS grid reference) · View on Apple Maps WFD catchment Lodden (GB108043022440) 2024 spills / hours 4 / 0.4 Long-term average 2.3 spills a year (monitored since 2022) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Tributary of Fern Brook	2	0.1	down 50%	91%
St Oswalds Road CSO Overflow on sewer network Company site name BRISTOL ST OSWALDS ROAD NO 2 IN BACK GARDEN EA ID / permit WXW01044 · 100871 Outlet location ST5793475224 (OS grid reference) · View on Apple Maps WFD catchment Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840) 2024 spills / hours 4 / 0.4 Long-term average 3.3 spills a year (monitored since 2023) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Trib of Cranbrook	3	0.1	down 25%	100%
Loop Road CSO Overflow on sewer network Company site name BATH LOOP ROAD WALCOT STREET CAR PARK EA ID / permit WXW00645 · 101187 Outlet location ST7515764977 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 3 / 0.4 Long-term average 2.4 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	River Avon	3	0.1	no change	100%
New Hill CSO Overflow on sewer network Company site name SOMERTON NEW HILL NR 16 EA ID / permit WXW00787 · 103571 Outlet location ST4956028760 (OS grid reference) · View on Apple Maps WFD catchment Cary - source to conf with KSD (GB108052015140) 2024 spills / hours 0 / 0.0 Long-term average 0.3 spills a year (monitored since 2023) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.1 hours spilling →	Tributary of River Cary	1	0.1	up from 0	100%
Milborne St Andrew PS Storm discharge at pumping station Company site name MILBORNE ST ANDREW MANOR FARM EA ID / permit WXW00724 · 042113 Outlet location SY8017096980 (OS grid reference) · View on Apple Maps WFD catchment Bere Stream (GB108044009630) 2024 spills / hours 0 / 0.0 Long-term average 9.4 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Tributary of Bere Stream	1	0.1	up from 0	100%
Langton Road Pumping Station Storm discharge at pumping station Company site name BLANDFORD LANGTON ROAD (BLANDFORD NO 1) EA ID / permit WXW00618 · 401302 Outlet location ST8879006190 (OS grid reference) · View on Apple Maps WFD catchment Stour (Middle d/s Pimperne Brook) (GB108043016052) 2024 spills / hours 5 / 8.3 Long-term average 5.7 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.1 hours spilling →	River Stour(S)	2	0.1	down 60%	100%
Hazzards Hill CSO Overflow on sewer network Company site name MERE WHITE ROAD EA ID / permit WXW00517 · 401451 Outlet location ST8153932473 (OS grid reference) · View on Apple Maps WFD catchment Shreen Water (including Ashfield Water) (GB108043022450) 2024 spills / hours 5 / 1.0 Long-term average 4.4 spills a year (monitored since 2021) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Shreen Water	1	0.1	down 80%	100%
Sea Mills Lane (2) CSO Overflow on sewer network Company site name BRISTOL PORTWAY BRIDGE EA ID / permit WXW00966 · 100841 Outlet location ST5488075830 (OS grid reference) · View on Apple Maps WFD catchment BRISTOL AVON (GB530905415405) 2024 spills / hours 3 / 3.4 Long-term average 2.9 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	River Avon via SWS (Estuarine)	1	0.1	down 67%	96%
Alfred Street CSO Overflow on sewer network Company site name WESTBURY ALFRED ST CONSERVATIVE CLUB EA ID / permit WXW00071 · 103574 Outlet location ST8743251549 (OS grid reference) · View on Apple Maps WFD catchment Bitham Bk - source to conf Biss Bk (GB109053021770) 2024 spills / hours 3 / 0.4 Long-term average 2.3 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.1 hours spilling →	Bitham Brook	1	0.1	down 67%	95%
39 Speedwell Road CSO Overflow on sewer network Company site name BRISTOL SPEEDWELL ROAD O/S NO 34 EA ID / permit WXW00030 · 102882 Outlet location ST5611874456 (OS grid reference) · View on Apple Maps WFD catchment BRISTOL AVON (GB530905415405) 2024 spills / hours 2 / 0.3 Long-term average 1.1 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	River Avon via SWS (Estuarine)	1	0.1	down 50%	98%
Chippenham - High Street Opp 25 - Combined Sewer Overflow Overflow on sewer network EA ID / permit WXW01326 · Unpermitted Outlet location ST9197473360 (OS grid reference) · View on Apple Maps WFD catchment Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440) Bathing water River Avon at Fordingbridge 2024 spills / hours – / – Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.1 hours spilling →	River Avon(S)	1	0.1		100%
Rush Hill Overflow on sewer network Company site name BATH RUSH HILL / OLD FOSSE ROAD JUNCTION EA ID / permit WXW00944 · 101930 Outlet location ST7343064930 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 1 / 0.0 Long-term average 1.0 spills a year (monitored since 2024) Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 0.1 hours spilling →	River Avon	1	0.1	no change	100%
Maxse Road CSO Overflow on sewer network Company site name BRISTOL MAXSE ROAD JUNCTION MARSTON ROAD EA ID / permit WXW00038 · 013224 Outlet location ST6091969974 (OS grid reference) · View on Apple Maps WFD catchment Brislington Bk - source to conf R Avon (Brist) (GB109053021980) 2024 spills / hours 1 / 0.1 Long-term average 0.5 spills a year (monitored since 2022) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Brislington Brook via SWS	1	0.1	no change	100%

Sewage treatment works

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

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