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

020k40k60k80kJan 2025: 60,197 hours spillingJanFeb 2025: 30,296 hours spillingFebMar 2025: 7,928 hours spillingMarApr 2025: 1,385 hours spillingAprMay 2025: 762 hours spillingMayJun 2025: 472 hours spillingJunJul 2025: 218 hours spillingJulAug 2025: 452 hours spillingAugSep 2025: 2,922 hours spillingSepOct 2025: 1,454 hours spillingOctNov 2025: 18,116 hours spillingNovDec 2025: 66,686 hours spillingDec
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.

OverflowDischarges toSpills 2025Hours 2025Spills vs 2024Monitor uptime
The Bridge PS
Storm discharge at pumping station
Company site name
STURMINSTER NEWTON THE BRIDGE
EA ID / permit
WXW01116 · 402224
Outlet location
ST7860013680 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Middle u/s Pimperne Brook) (GB108043016051)
2024 spills / hours
24 / 157
Long-term average
16.5 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 89 hours spilling →
The River Stour(S) 12 89 down 50% 96%
Spring Gardens Road Combined Sewer
Overflow on sewer network
Company site name
BATH SPRING GARDENS ROAD NO 1
EA ID / permit
WXW01030 · 103041
Outlet location
ST7540064500 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
32 / 326
Long-term average
22.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 88 hours spilling →
River Avon(S) 12 88 down 63% 100%
Hillsmoor Water Recycling Centre
Storm tank at sewage works
Sewage works
Hillsmoor
Company site name
WIVELISCOMBE HILLSMOOR STORM TANK
EA ID / permit
WXW00542 · NPSWQD000307
Outlet location
ST0861827364 (OS grid reference) · View on Apple Maps
WFD catchment
Hillfarrance Bk (GB108052015510)
2024 spills / hours
34 / 154
Long-term average
28.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 87 hours spilling →
Trib of Hillfarrance Brook 21 87 down 38% 100%
Donyatt Pumping Station
Storm discharge at pumping station
Company site name
DONYATT
EA ID / permit
WXW00371 · 102568
Outlet location
ST3398614019 (OS grid reference) · View on Apple Maps
WFD catchment
Isle - Upper to conf Cad Bk (GB108052015190)
2024 spills / hours
10 / 92
Long-term average
7.9 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 87 hours spilling →
River Isle 12 87 up 20% 100%
Hengistbury Head Pumping Station
Storm discharge at pumping station
Company site name
SOUTHBOURNE HENGISTBURY HEAD
EA ID / permit
WXW00521 · 400550
Outlet location
SZ1589090520 (OS grid reference) · View on Apple Maps
WFD catchment
Dorset / Hampshire (GB620705550000)
Bathing water
Bournemouth Hengistbury West
2024 spills / hours
27 / 76
Long-term average
20.7 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 87 hours spilling →
Poole Bay (C) 17 87 down 37% 100%
Spaxton Pumping Station
Storm discharge at pumping station
Company site name
SPAXTON
EA ID / permit
WXW01026 · 070975
Outlet location
ST2412137369 (OS grid reference) · View on Apple Maps
WFD catchment
Cannington Bk - Lower (GB108052021310)
2024 spills / hours
14 / 145
Long-term average
11.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 86 hours spilling →
A Trib of the Cannington Brook 11 86 down 21% 100%
Lower Stanton St Quintin Ww PS
Storm discharge at pumping station
Company site name
LOWER STANTON ST QUINTIN
EA ID / permit
WXW00656 · EPRAB3098VQ
Outlet location
ST9160880398 (OS grid reference) · View on Apple Maps
WFD catchment
Rodbourne Bk - source to conf R Avon (Brist) (GB109053027720)
2024 spills / hours
45 / 204
Long-term average
32.8 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 85 hours spilling →
Rodbourne Brook 20 85 down 56% 100%
Tarrant Crawford WRC
Storm tank at sewage works
Sewage works
Tarrant Crawford
Company site name
TARRANT CRAWFORD STORM TANK
EA ID / permit
WXW01103 · 042479
Outlet location
ST9148902975 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Middle d/s Pimperne Brook) (GB108043016052)
2024 spills / hours
30 / 424
Long-term average
22.3 spills a year (monitored since 2022)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 85 hours spilling →
River Stour 8 85 down 73% 100%
Sturminster Newton WRC
Inlet overflow at sewage works
Sewage works
Sturminster Newton
Company site name
STURMINSTER NEWTON OPP RIXON CLOSE INLET
EA ID / permit
WXW01083 · NPSWQD008026
Outlet location
ST7996413981 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Middle u/s Pimperne Brook) (GB108043016051)
2024 spills / hours
35 / 46
Long-term average
26.7 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 85 hours spilling →
River Stour 26 85 down 26% 100%
Martock Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Martock
Company site name
MARTOCK HURST BOW INLET
EA ID / permit
WXW00696 · 100288
Outlet location
ST4512019240 (OS grid reference) · View on Apple Maps
WFD catchment
Wellhams Brook (GB108052015350)
2024 spills / hours
17 / 93
Long-term average
24.9 spills a year (monitored since 2018)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 85 hours spilling →
Parrett and Hinton Meads Brook 19 85 up 12% 100%
Pedwell Pumping Station
Storm discharge at pumping station
Company site name
PEDWELL
EA ID / permit
WXW00850 · 102298
Outlet location
ST4241736262 (OS grid reference) · View on Apple Maps
WFD catchment
King's Sedgemoor Drain - Henley Sluice to mouth (GB108052021150)
2024 spills / hours
29 / 162
Long-term average
20.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 85 hours spilling →
Greinton Rhyne (S) 16 85 down 45% 100%
Poole E STW
Storm tank at sewage works
Sewage works
Poole E
Company site name
POOLE CABOT LANE STORM TANK
EA ID / permit
WXW00868 · 401354
Outlet location
SZ0071093560 (OS grid reference) · View on Apple Maps
WFD catchment
POOLE HARBOUR (GB520804415800)
Bathing water
Poole Harbour Rockley Sands; Poole Harbour Lake
Shellfish water
Poole Bay; Poole Harbour North; Poole Harbour South; Poole Harbour West
2024 spills / hours
21 / 163
Long-term average
14.9 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 84 hours spilling →
Tributary of Holes Bay(E) 12 84 down 43% 100%
Wagg Bridge Pumping Station
Storm discharge at pumping station
Company site name
HUISH EPISCOPI WAGG BRIDGE
EA ID / permit
WXW01180 · 071163
Outlet location
ST4405527510 (OS grid reference) · View on Apple Maps
WFD catchment
King's Sedgemoor Drain - Henley Sluice to mouth (GB108052021150)
2024 spills / hours
17 / 240
Long-term average
14.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 84 hours spilling →
Wagg Rhyne 7 84 down 59% 100%
Stoke Lane Combined Sewer Overflow
Overflow on sewer network
Company site name
BRISTOL STOKE LANE O/S NO 122 WESTBURY ON TRYM
EA ID / permit
WXW01069 · 013106
Outlet location
ST5673577540 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
68 / 142
Long-term average
60.0 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 84 hours spilling →
River Trym via SWS 56 84 down 18% 100%
Dorchester (Louds Mill) STW
Inlet overflow at sewage works
Sewage works
Dorchester
Company site name
DORCHESTER LOUDS MILL ST GEORGES ROAD INLET
EA ID / permit
WXW00373 · 401050
Outlet location
SY7116090340 (OS grid reference) · View on Apple Maps
WFD catchment
Frome Dorset (Lower) d/s Louds Mill Dorchester (GB108044009692)
2024 spills / hours
14 / 118
Long-term average
10.8 spills a year (monitored since 2022)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 83 hours spilling →
River Frome(S) 8 83 down 43% 100%
Pawlett Pumping Station
Storm discharge at pumping station
Company site name
PAWLETT MAIN ROAD
EA ID / permit
WXW00849 · 102689
Outlet location
ST3019643075 (OS grid reference) · View on Apple Maps
WFD catchment
Huntspill (GB108052021210)
2024 spills / hours
14 / 116
Long-term average
10.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 82 hours spilling →
Trib of Brick Yard Rhyne V SWS 9 82 down 36% 100%
Froglands Pumping Station
Storm discharge at pumping station
Company site name
CHEDDAR FROGLANDS
EA ID / permit
WXW00451 · 101665
Outlet location
ST4604052990 (OS grid reference) · View on Apple Maps
WFD catchment
Cheddar Yeo - source to conf Stubbingham Rhyne (GB109052021540)
2024 spills / hours
69 / 205
Long-term average
54.5 spills a year (monitored since 2019)
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 82 hours spilling →
River Yeo (S) 38 82 down 45% 100%
Semington Road CSO
Overflow on sewer network
Company site name
MELKSHAM SEMINGTON ROAD O/S POLICE STATION
EA ID / permit
WXW00971 · 102323
Outlet location
ST8964063540 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
41 / 198
Long-term average
31.7 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 81 hours spilling →
River Avon(S) 22 81 down 46% 100%
Lower Keyford CSO
Overflow on sewer network
Company site name
FROME LOWER KEYFORD
EA ID / permit
WXW00654 · 101595
Outlet location
ST7772547081 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Maiden Bradley to Mells) (GB109053022101)
2024 spills / hours
69 / 154
Long-term average
61.6 spills a year (monitored since 2019)
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 81 hours spilling →
Trib of River Frome (via SWS) 58 81 down 16% 100%
Summerhedge Pumping Station
Storm discharge at pumping station
Company site name
OTHERY RYE LANE/ SUMMERHEDGE ROAD
EA ID / permit
WXW01086 · 101715
Outlet location
ST3849031360 (OS grid reference) · View on Apple Maps
WFD catchment
King's Sedgemoor Drain - Henley Sluice to mouth (GB108052021150)
2024 spills / hours
16 / 118
Long-term average
9.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 80 hours spilling →
Trib of Sowy River (S) 9 80 down 44% 100%
Lord Nelson Pumping Station
Storm discharge at pumping station
Company site name
ILMINSTER LORD NELSON
EA ID / permit
WXW00647 · 102397
Outlet location
ST3485215060 (OS grid reference) · View on Apple Maps
WFD catchment
Isle - Upper to conf Cad Bk (GB108052015190)
2024 spills / hours
6 / 36
Long-term average
6.8 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 80 hours spilling →
Freshwater (S) 9 80 up 50% 100%
Bristol Road Combined Sewer
Overflow on sewer network
Company site name
CHIPPENHAM BRISTOL ROAD
EA ID / permit
WXW00184 · 100818
Outlet location
ST9114273900 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
63 / 199
Long-term average
58.0 spills a year (monitored since 2024)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 79 hours spilling →
Hardenhuish Brook 53 79 down 16% 100%
Devizes Water Recycling Centre
Storm tank at sewage works
Sewage works
Devizes
Company site name
DEVIZES WEBBS LANE STORM TANK
EA ID / permit
WXW00363 · 102172
Outlet location
ST9938561167 (OS grid reference) · View on Apple Maps
WFD catchment
Poulshot Str - source to conf Summerham Bk (GB109053022190)
2024 spills / hours
36 / 304
Long-term average
22.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 79 hours spilling →
Waylen Brook 10 79 down 72% 100%
North Newnton Pumping Station
Storm discharge at pumping station
Company site name
NORTH NEWNTON
EA ID / permit
WXW00803 · 402067
Outlet location
SU1356056770 (OS grid reference) · View on Apple Maps
WFD catchment
Hampshire Avon (East) and Woodborough Stream (GB108043022410)
2024 spills / hours
24 / 339
Long-term average
17.3 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 79 hours spilling →
River Avon 6 79 down 75% 100%
Station Road CSO
Overflow on sewer network
Company site name
BATH STATION ROAD S/O 44 LOCKSBROOK ROAD
EA ID / permit
WXW01060 · EPRAP3920XP
Outlet location
ST7303764818 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
29 / 214
Long-term average
17.3 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 79 hours spilling →
River Avon 16 79 down 45% 98%
Midford Pumping Station
Storm discharge at pumping station
Company site name
MIDFORD TUCKING MILL
EA ID / permit
WXW00720 · 021434
Outlet location
ST7637561157 (OS grid reference) · View on Apple Maps
WFD catchment
Wellow Bk - Snails Bk to Bristol Avon (GB109053022271)
2024 spills / hours
43 / 221
Long-term average
30.3 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 78 hours spilling →
Midford Brook 18 78 down 58% 100%
Stanton Drew WRC
Storm tank at sewage works
Sewage works
Stanton Drew
Company site name
STANTON DREW STORM TANK
EA ID / permit
WXW01050 · 012549
Outlet location
ST6029463320 (OS grid reference) · View on Apple Maps
WFD catchment
Chew - conf Winford Bk to conf R Avon (Brist) (GB109053021950)
2024 spills / hours
41 / 713
Long-term average
22.8 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 78 hours spilling →
River Chew 11 78 down 73% 100%
Station Road CSO
Overflow on sewer network
Company site name
KINGSWOOD STATION ROAD
EA ID / permit
WXW01058 · 103075
Outlet location
ST6610075400 (OS grid reference) · View on Apple Maps
WFD catchment
Siston Bk - source to conf R Avon (Brist) (GB109053027450)
2024 spills / hours
32 / 170
Long-term average
22.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 78 hours spilling →
Trib of Warmley Brook(S) 16 78 down 50% 100%
Curtis Orchard Pumping Station
Storm discharge at pumping station
Company site name
BROUGHTON GIFFORD CURTIS ORCHARD
EA ID / permit
WXW00359 · 100633
Outlet location
ST8804463526 (OS grid reference) · View on Apple Maps
WFD catchment
Chalfield Brook - source to conf Avon (GB109053021890)
2024 spills / hours
14 / 124
Long-term average
10.7 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 77 hours spilling →
Trib. of Chalfield Brook 7 77 down 50% 100%
Kings Head CSO
Overflow on sewer network
Company site name
COLEFORD KINGS HEAD
EA ID / permit
WXW00596 · 103442
Outlet location
ST6880848710 (OS grid reference) · View on Apple Maps
WFD catchment
Mells source to conf with Somerset Frome (GB109053022020)
2024 spills / hours
55 / 199
Long-term average
40.6 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Apr
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 77 hours spilling →
Mells Stream 26 77 down 53% 83%
Mudford Pumping Station
Storm discharge at pumping station
Company site name
YEOVIL MUDFORD
EA ID / permit
WXW00763 · NPSWQD003764
Outlet location
ST5748819994 (OS grid reference) · View on Apple Maps
WFD catchment
Yeo Ds Over Compton (GB108052015682)
2024 spills / hours
18 / 119
Long-term average
11.6 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 77 hours spilling →
River Yeo 11 77 down 39% 100%
The Coat Pumping Station
Storm discharge at pumping station
Company site name
COAT CRIPPLE STREET (OLD STW SITE)
EA ID / permit
WXW01117 · 071742
Outlet location
ST4509220512 (OS grid reference) · View on Apple Maps
WFD catchment
Parrett - Lopen Bk to R Isle (GB108052015360)
2024 spills / hours
19 / 88
Long-term average
24.9 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 77 hours spilling →
Tributary of the River Parrett 20 77 up 5% 100%
Craigside Pumping Station
Storm discharge at pumping station
Company site name
ST LEONARDS CRAIGSIDE ROAD
EA ID / permit
WXW00336 · 401243
Outlet location
SU1063703483 (OS grid reference) · View on Apple Maps
WFD catchment
Crane (Dorset) (GB108043016090)
2024 spills / hours
29 / 157
Long-term average
10.8 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 76 hours spilling →
Trib of Moors River 20 76 down 31% 100%
Charmouth Sewage Disposal Works
Inlet overflow at sewage works
Sewage works
Charmouth
Company site name
CHARMOUTH SEA OUTFALL INLET
EA ID / permit
WXW00256 · 401625
Outlet location
SY3678091710 (OS grid reference) · View on Apple Maps
WFD catchment
Lyme Bay East (GB620806560000)
Bathing water
Charmouth West
2024 spills / hours
95 / 323
Long-term average
73.0 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 76 hours spilling →
Lyme Bay(C) & River Char(S) 70 76 down 26% 100%
Radford Hill CSO
Overflow on sewer network
Company site name
TIMSBURY RADFORD HILL
EA ID / permit
WXW00909 · 013267
Outlet location
ST6704958482 (OS grid reference) · View on Apple Maps
WFD catchment
Cam Bk - source to conf Wellow Bk (GB109053022290)
2024 spills / hours
51 / 158
Long-term average
38.8 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 76 hours spilling →
Trib of Cam Brook (S) 30 76 down 41% 100%
Swanage Tunnel
Storm tank at sewage works
Sewage works
Swanage Tunnel
Company site name
SWANAGE MARINE PARADE TUNNEL
EA ID / permit
WXW01097 · 400785
Outlet location
SZ0424378665 (OS grid reference) · View on Apple Maps
WFD catchment
Dorset / Hampshire (GB620705550000)
Bathing water
Swanage Central
2024 spills / hours
31 / 134
Long-term average
24.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 76 hours spilling →
Swanage Bay 20 76 down 35% 100%
Compton Durville CSO
Overflow on sewer network
Company site name
COMPTON DURVILLE STORM SCREEN
EA ID / permit
WXW00320 · 102006
Outlet location
ST4197017550 (OS grid reference) · View on Apple Maps
WFD catchment
Lam Brook (GB108052015340)
2024 spills / hours
41 / 84
Long-term average
26.3 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 76 hours spilling →
Trib of Lambrook Brook(S) 42 76 up 2% 100%
Ilchester Pumping Station
Storm discharge at pumping station
Company site name
ILCHESTER MAIN
EA ID / permit
WXW00577 · 012884
Outlet location
ST5215122880 (OS grid reference) · View on Apple Maps
WFD catchment
Yeo Ds Over Compton (GB108052015682)
2024 spills / hours
2 / 16
Long-term average
2.6 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 76 hours spilling →
River Yeo 6 76 up 200% 100%
Glebe Farm Pumping Station
Storm discharge at pumping station
Company site name
CHURCH KNOWLE GLEBE FARM
EA ID / permit
WXW00465 · 401417
Outlet location
SY9506581663 (OS grid reference) · View on Apple Maps
WFD catchment
Corfe River (GB108044010020)
2024 spills / hours
30 / 176
Long-term average
19.2 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 75 hours spilling →
Tributary of Corfe River 15 75 down 50% 100%
Bishopthorpe Road CSO
Overflow on sewer network
Company site name
BRISTOL WELLINGTON HILL WEST / BISHOPTHORPE ROAD
EA ID / permit
WXW00139 · 100464
Outlet location
ST5815577315 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
65 / 133
Long-term average
59.8 spills a year (monitored since 2021)
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 75 hours spilling →
Trib of River Trym via SWS 52 75 down 20% 100%
Upton Pumping Station
Storm discharge at pumping station
Company site name
UPTON NR LANGPORT
EA ID / permit
WXW01171 · 102405
Outlet location
ST4585726067 (OS grid reference) · View on Apple Maps
WFD catchment
King's Sedgemoor Drain - Henley Sluice to mouth (GB108052021150)
2024 spills / hours
15 / 99
Long-term average
12.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 75 hours spilling →
Trib of Long Sutton Main Drain 10 75 down 33% 100%
Chew Stoke Pumping Station
Storm discharge at pumping station
Company site name
CHEW STOKE BILBIE ROAD
EA ID / permit
WXW00264 · 021523
Outlet location
ST5633761806 (OS grid reference) · View on Apple Maps
WFD catchment
Chew - Chew Valley Lake to conf Winford Brook (GB109053021852)
2024 spills / hours
50 / 63
Long-term average
25.0 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 74 hours spilling →
Trib of River Chew 50 74 no change 100%
Polly Barnes Hill CSO
Overflow on sewer network
Company site name
BRISTOL HANHAM POLLY BARNES HILL
EA ID / permit
WXW00864 · 101750
Outlet location
ST6289672187 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
69 / 154
Long-term average
68.0 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
Operational improvement completed
Volume & pollution
Estimate from 74 hours spilling →
River Avon (via SWS) 57 74 down 17% 100%
Cautletts Close CSO
Overflow on sewer network
Company site name
MIDSOMER NORTON CAUTLETTS CLOSE
EA ID / permit
WXW00238 · 011552
Outlet location
ST6583753584 (OS grid reference) · View on Apple Maps
WFD catchment
Somer (GB109053022251)
2024 spills / hours
20 / 252
Long-term average
17.7 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 73 hours spilling →
River Somer 10 73 down 50% 99%
Cherington Road CSO
Overflow on sewer network
Company site name
BRISTOL CHERINGTON ROAD O/S NO 2
EA ID / permit
WXW00262 · 100467
Outlet location
ST5815677315 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
49 / 166
Long-term average
45.0 spills a year (monitored since 2018)
Monitor below 90%
Sensor failure / issue · Resolved - Jul
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 73 hours spilling →
Trib of River Trym via SWS 29 73 down 41% 49%
Wiveliscombe (Style) STW
Inlet overflow at sewage works
Sewage works
Wiveliscombe
Company site name
WIVELISCOMBE STYLES INLET
EA ID / permit
WXW01273 · 102050
Outlet location
ST0842028330 (OS grid reference) · View on Apple Maps
WFD catchment
Hillfarrance Bk (GB108052015510)
2024 spills / hours
62 / 92
Long-term average
61.4 spills a year (monitored since 2021)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 72 hours spilling →
Trib of Hillfarrance Brook(S) 50 72 down 19% 100%
Tisbury Combined Sewer Overflow
Overflow on sewer network
Company site name
TISBURY NADDER CLOSE PLAYING FIELDS
EA ID / permit
WXW01139 · 401794
Outlet location
ST9465729299 (OS grid reference) · View on Apple Maps
WFD catchment
Nadder (Upper) (GB108043016200)
2024 spills / hours
56 / 154
Long-term average
37.1 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 71 hours spilling →
River Nadder via SWS 36 71 down 36% 100%
St. Johns Bridge CSO
Overflow on sewer network
Company site name
MALMESBURY LOWER HIGH STREET
EA ID / permit
WXW01045 · 012851
Outlet location
ST9352386908 (OS grid reference) · View on Apple Maps
WFD catchment
Sherston Avon (GB109053027690)
2024 spills / hours
43 / 175
Long-term average
28.9 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 70 hours spilling →
Sherston Avon 18 70 down 58% 98%
Stanley Green Road CSO
Overflow on sewer network
Company site name
POOLE STANLEY GREEN ROAD
EA ID / permit
WXW01049 · 400743
Outlet location
SZ0100192019 (OS grid reference) · View on Apple Maps
WFD catchment
Not part of a river WB catchment
Shellfish water
Poole Bay; Poole Harbour North; Poole Harbour South; Poole Harbour West
2024 spills / hours
52 / 133
Long-term average
35.9 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 70 hours spilling →
Creekmoor Lake(via SWS) 35 70 down 33% 100%
Orchard Leigh CSO
Overflow on sewer network
Company site name
BALTONSBOROUGH ORCHARD LEIGH
EA ID / permit
WXW00828 · 101888
Outlet location
ST5454834384 (OS grid reference) · View on Apple Maps
WFD catchment
Brue - Tootle Bridge to Clyse Hole (GB108052021182)
2024 spills / hours
21 / 96
Long-term average
13.1 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 70 hours spilling →
Mill Stream(S) 10 70 down 52% 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.