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
Chatham Row CSO
Overflow on sewer network
Company site name
BATH WALCOT RIVER BANK END OF CHATHAM ROW
EA ID / permit
WXW00259 · 101186
Outlet location
ST7518465425 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
60 / 222
Long-term average
52.1 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 69 hours spilling →
River Avon 49 69 down 18% 100%
Marsh Lane CSO
Overflow on sewer network
Company site name
CANNINGTON MARSH LANE
EA ID / permit
WXW00691 · 102214
Outlet location
ST2631039810 (OS grid reference) · View on Apple Maps
WFD catchment
Cannington Bk - Lower (GB108052021310)
2024 spills / hours
32 / 118
Long-term average
19.4 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 69 hours spilling →
Trib of Cannington Brook(S) 19 69 down 41% 100%
Midsomer Norton CSO
Overflow on sewer network
Company site name
MIDSOMER NORTON NORTHMEAD ROAD/ HAYES PARK ROAD
EA ID / permit
WXW00722 · 101866
Outlet location
ST6581054730 (OS grid reference) · View on Apple Maps
WFD catchment
Wellow Bk - source to conf Snails Bk (GB109053022250)
2024 spills / hours
20 / 48
Long-term average
17.4 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 68 hours spilling →
Wellow Brook 17 68 down 15% 100%
Lopen Pumping Station
Storm discharge at pumping station
Company site name
LOPEN
EA ID / permit
WXW00646 · NPSWQD004020
Outlet location
ST4272314017 (OS grid reference) · View on Apple Maps
WFD catchment
Lopen Brook (GB108052015330)
2024 spills / hours
8 / 84
Long-term average
13.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 67 hours spilling →
Lopen Brook 5 67 down 38% 100%
Lee Lane Pumping Station
Storm discharge at pumping station
Company site name
BRADPOLE LEE LANE
EA ID / permit
WXW00625 · 402029
Outlet location
SY4808993847 (OS grid reference) · View on Apple Maps
WFD catchment
Asker (GB108044009580)
2024 spills / hours
38 / 219
Long-term average
17.4 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 67 hours spilling →
River Asker 15 67 down 61% 100%
Maiden Bradley Drive to STW
Overflow on sewer network
EA ID / permit
WXW00777 · Unpermitted
Outlet location
ST8106038540 (OS grid reference) · View on Apple Maps
WFD catchment
Wylye (Headwaters) (GB108043022520)
2024 spills / hours
56 / 88
Long-term average
53.0 spills a year (monitored since 2022)
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 67 hours spilling →
Groundwater via an infiltration system 61 67 up 9% 100%
Westmead Pumping Station
Storm discharge at pumping station
Company site name
CHIPPENHAM WESTMEAD
EA ID / permit
WXW01237 · 100823
Outlet location
ST9201872133 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
24 / 298
Long-term average
10.2 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 67 hours spilling →
River Avon 6 67 down 75% 100%
Keynsham Low Level Pumping Station
Storm discharge at pumping station
Company site name
KEYNSHAM LOW LEVEL
EA ID / permit
WXW00590 · 102124
Outlet location
ST6568068530 (OS grid reference) · View on Apple Maps
WFD catchment
Chew - conf Winford Bk to conf R Avon (Brist) (GB109053021950)
2024 spills / hours
38 / 346
Long-term average
15.9 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 67 hours spilling →
River Chew 8 67 down 79% 100%
Alveston Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Alveston
Company site name
ALVESTON LOWER HAZEL INLET
EA ID / permit
WXW00079 · 010002
Outlet location
ST6213287039 (OS grid reference) · View on Apple Maps
WFD catchment
Chestle Pill (GB109054026650)
2024 spills / hours
38 / 182
Long-term average
30.3 spills a year (monitored since 2023)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 66 hours spilling →
Tockington Mill Rhine 17 66 down 55% 100%
West Town Road Pumping Station
Storm discharge at pumping station
Company site name
BRISTOL WEST TOWN ROAD
EA ID / permit
WXW01229 · 102067
Outlet location
ST5202277004 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
28 / 105
Long-term average
27.8 spills a year (monitored since 2020)
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 65 hours spilling →
River Avon (Estuarine) 14 65 down 50% 100%
Bridport West Street CSO
Overflow on sewer network
Company site name
BRIDPORT WEST STREET
EA ID / permit
WXW00180 · 402083
Outlet location
SY4632093020 (OS grid reference) · View on Apple Maps
WFD catchment
Brit (Upper) (GB108044009600)
2024 spills / hours
56 / 158
Long-term average
48.8 spills a year (monitored since 2018)
High-spill reason (company)
Not Applicable - Ongoing investigation
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - May
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 65 hours spilling →
River Brit 40 65 down 29% 90%
Portishead Town Pumping Station
Storm discharge at pumping station
Company site name
PORTISHEAD TOWN HARBOUR ROAD
EA ID / permit
WXW00876 · 070308
Outlet location
ST4762076400 ST4720076480 (OS grid reference) · View on Apple Maps
WFD catchment
Portbury Ditch - source to conf R Severn Estuary (GB109052027330)
2024 spills / hours
23 / 110
Long-term average
6.9 spills a year (monitored since 2018)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 65 hours spilling →
Portbury Ditch,Trib 15 65 down 35% 100%
Avon Road Pumping Station
Storm discharge at pumping station
Company site name
PILL AVON ROAD
EA ID / permit
WXW00091 · 011673
Outlet location
ST5228676403 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
33 / 90
Long-term average
43.5 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 64 hours spilling →
River Avon (Estuarine) 26 64 down 21% 100%
Nailsbourne Pumping Station
Storm discharge at pumping station
Company site name
NAILSBOURNE
EA ID / permit
WXW00778 · 103191
Outlet location
ST2143928401 (OS grid reference) · View on Apple Maps
WFD catchment
Tributary of Back Stream (Tone Catchment) (GB108052015490)
2024 spills / hours
18 / 35
Long-term average
12.8 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 64 hours spilling →
Trib of the Back Stream 6 64 down 67% 100%
Corscombe Wastewater Treatment Work
Storm tank at sewage works
Sewage works
Corscombe Wastewater Treatment Work
Company site name
CORSCOMBE OFF FUDGE HILL STORM TANK
EA ID / permit
WXW00327 · 070026
Outlet location
ST5208005663 (OS grid reference) · View on Apple Maps
WFD catchment
Sutton Bingham Stream - East Arm (GB108052015520)
2024 spills / hours
14 / 51
Long-term average
20.1 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 64 hours spilling →
Halstock Stream 15 64 up 7% 100%
Church Lane Pumping Station
Storm discharge at pumping station
Company site name
WEST PARLEY CHURCH LANE
EA ID / permit
WXW00283 · 401157
Outlet location
SZ0842296933 SZ0842096933 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Lower) (GB108043011040)
2024 spills / hours
32 / 157
Long-term average
22.3 spills a year (monitored since 2022)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - May
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 63 hours spilling →
River Stour 11 63 down 66% 88%
Sharpstone Combined Sewer Overflow
Overflow on sewer network
Company site name
FRESHFORD FIELDS OFF ROSEMARY LANE
EA ID / permit
WXW00979 · 010822
Outlet location
ST7856659569 (OS grid reference) · View on Apple Maps
WFD catchment
Somerset Frome conf with Mells to conf B. Avo (GB109053021840)
2024 spills / hours
67 / 165
Long-term average
49.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 63 hours spilling →
River Frome 29 63 down 57% 99%
Trym Road CSO
Overflow on sewer network
Company site name
BRISTOL TRYM ROAD O/S NO 41
EA ID / permit
WXW01157 · 100847
Outlet location
ST5740977432 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
38 / 97
Long-term average
32.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 62 hours spilling →
River Trym 30 62 down 21% 100%
Towpath Combined Sewer Overflow
Overflow on sewer network
Company site name
BATH NORFOLK BUILDINGS
EA ID / permit
WXW01150 · 102273
Outlet location
ST7434864830 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
48 / 243
Long-term average
31.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 62 hours spilling →
River Avon 20 62 down 58% 100%
Mildmay Place CSO
Overflow on sewer network
Company site name
QUEEN CAMEL MILDMAY PLACE IN THE REAR GARDEN OF MILDMAY ORCHARD
EA ID / permit
WXW00726 · 101773
Outlet location
ST5960225024 (OS grid reference) · View on Apple Maps
WFD catchment
Cam - Lower (GB108052015650)
2024 spills / hours
26 / 67
Long-term average
13.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 62 hours spilling →
River Cam 13 62 down 50% 100%
Bristol Road CSO
Overflow on sewer network
Company site name
PAULTON WORKS OFF BRISTOL ROAD
EA ID / permit
WXW00186 · 102213
Outlet location
ST6526257063 (OS grid reference) · View on Apple Maps
WFD catchment
Cam Bk - source to conf Wellow Bk (GB109053022290)
2024 spills / hours
38 / 144
Long-term average
27.7 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 60 hours spilling →
Trib of Cam Brook 21 60 down 45% 100%
Frome Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Frome
Company site name
FROME WELSHMILL LANE STORM TANKS STORM TANK
EA ID / permit
WXW00454 · 102222
Outlet location
ST7735248660 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Maiden Bradley to Mells) (GB109053022101)
2024 spills / hours
43 / 153
Long-term average
27.0 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 60 hours spilling →
River Frome(S) 22 60 down 49% 100%
Entry Hill Gardens CSO
Overflow on sewer network
Company site name
BATH ENTRY HILL GARDENS R/G NO 6 (LYNCOMBE VALE)
EA ID / permit
WXW00408 · NPSWQD002414
Outlet location
ST7536064290 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
67 / 102
Long-term average
66.0 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 60 hours spilling →
The River Avon 65 60 down 3% 100%
Lower High Street CSO
Overflow on sewer network
Company site name
BRISTOL AVONMOUTH ROAD / WEST TOWN ROAD
EA ID / permit
WXW00653 · 102073
Outlet location
ST5202277004 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
37 / 249
Long-term average
26.5 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 59 hours spilling →
River Avon via SWS (Estuarine) 13 59 down 65% 99%
Pumping Station at the Green
Storm discharge at pumping station
Company site name
GREAT CHEVERELL CHEVERELL GREEN
EA ID / permit
WXW00457 · 021366
Outlet location
ST9817655226 (OS grid reference) · View on Apple Maps
WFD catchment
Semington Bk - source to conf Worton Str (GB109053022130)
2024 spills / hours
24 / 187
Long-term average
16.0 spills a year (monitored since 2023)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 59 hours spilling →
Trib of Semington Brook 8 59 down 67% 100%
Ameysford Road Pumping Station
Storm discharge at pumping station
Company site name
FERNDOWN AMEYSFORD ROAD
EA ID / permit
WXW00082 · 400646
Outlet location
SU0701002124 (OS grid reference) · View on Apple Maps
WFD catchment
Uddens Water (GB108043011080)
2024 spills / hours
20 / 67
Long-term average
14.1 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 59 hours spilling →
Tributary of Uddens Water 11 59 down 45% 100%
Berkeley Avenue CSO
Overflow on sewer network
Company site name
MIDSOMER NORTON BERKELEY AVENUE SO
EA ID / permit
WXW00129 · 013129
Outlet location
ST6642054720 (OS grid reference) · View on Apple Maps
WFD catchment
Wellow Bk - source to conf Snails Bk (GB109053022250)
2024 spills / hours
49 / 154
Long-term average
39.0 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 58 hours spilling →
Wellow Brook 28 58 down 43% 100%
Henleaze Road CSO
Overflow on sewer network
Company site name
BRISTOL HENLEAZE ROAD JUNCTION WITH HENLEAZE PARK DRIVE
EA ID / permit
WXW00525 · 100459
Outlet location
ST5801877358 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
54 / 104
Long-term average
53.7 spills a year (monitored since 2020)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Oct
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 58 hours spilling →
Trib of the River Trym via SWS 30 58 down 44% 53%
41 Wideatts Road CSO
Overflow on sewer network
Company site name
CHEDDAR HELLIER LANE / LOWER NEW ROAD
EA ID / permit
WXW00031 · 101666
Outlet location
ST4509853342 (OS grid reference) · View on Apple Maps
WFD catchment
Cheddar Yeo - source to conf Stubbingham Rhyne (GB109052021540)
2024 spills / hours
29 / 251
Long-term average
15.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 57 hours spilling →
Helliers Stream via SWS 10 57 down 66% 100%
11 Newcombe Road CSO
Overflow on sewer network
Company site name
BRISTOL NEWCOMBE ROAD O/S NO 11
EA ID / permit
WXW00002 · 013102
Outlet location
ST5673777541 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
40 / 79
Long-term average
33.7 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 56 hours spilling →
River Trym via SWS 27 56 down 33% 100%
Lake Pleasure Gardens CSO
Overflow on sewer network
Company site name
WARMINSTER WEYMOUTH STREET R/O 23 IN PLEASURE GARDENS NEAR SWIMMING POOL
EA ID / permit
WXW00610 · 401092
Outlet location
ST8734844869 (OS grid reference) · View on Apple Maps
WFD catchment
Wylye Trib (The Were or Swan) (GB108043022540)
2024 spills / hours
66 / 114
Long-term average
69.7 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 55 hours spilling →
River Wyle via the Were (SWS) 45 55 down 32% 100%
Water Lane Pumping Station
Storm discharge at pumping station
Company site name
DURWESTON WATER LANE
EA ID / permit
WXW01196 · 402475
Outlet location
ST8602308806 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Middle u/s Pimperne Brook) (GB108043016051)
2024 spills / hours
43 / 285
Long-term average
32.1 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 55 hours spilling →
Tributary of River Stour 6 55 down 86% 100%
Kinson Sewage Treatment Works
Storm tank at sewage works
Sewage works
Kinson
Company site name
KINSON NEW ROAD NORTHBOURNE STORM TANK
EA ID / permit
WXW00602 · 401495
Outlet location
SZ0879596516 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Lower) (GB108043011040)
Bathing water
Christchurch Avon Beach; Christchurch Friar`s Cliff
Shellfish water
North East Wash
2024 spills / hours
37 / 407
Long-term average
15.6 spills a year (monitored since 2017)
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 55 hours spilling →
River Stour 12 55 down 68% 100%
Rockcliffe Road CSO
Overflow on sewer network
Company site name
BATH ROCKCLIFFE ROAD R/O NO 45
EA ID / permit
WXW00932 · 010853
Outlet location
ST7554865762 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
44 / 215
Long-term average
26.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 54 hours spilling →
River Avon 16 54 down 64% 96%
Oakley Road CSO
Overflow on sewer network
Company site name
BRISTOL OAKLEY ROAD / FILTON AVENUE NEW
EA ID / permit
WXW00819 · 101851
Outlet location
ST6044076780 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840)
2024 spills / hours
52 / 94
Long-term average
48.8 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 54 hours spilling →
Horfield Brook (S) 45 54 down 13% 100%
Holt Sewage Treatment Works
Storm tank at sewage works
Sewage works
Holt
Company site name
HOLT POND HEAD STORM TANK
EA ID / permit
WXW00556 · 402465
Outlet location
SU0339004570 (OS grid reference) · View on Apple Maps
WFD catchment
Uddens Water (GB108043011080)
2024 spills / hours
18 / 114
Long-term average
12.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 54 hours spilling →
Tributary of Uddens Water 10 54 down 44% 100%
Tockenham STW
Inlet overflow at sewage works
Sewage works
Tockenham
Company site name
TOCKENHAM INLET
EA ID / permit
WXW01141 · 010238
Outlet location
SU0412779049 (OS grid reference) · View on Apple Maps
WFD catchment
Cowage Bk - source to conf unnamed trib (GB109053027640)
2024 spills / hours
52 / 210
Long-term average
48.7 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 53 hours spilling →
Cowage Brook,Ditch Trib of 17 53 down 67% 100%
Church Road Pumping Station
Storm discharge at pumping station
Company site name
BITTON
EA ID / permit
WXW00285 · 010665
Outlet location
ST6799069399 (OS grid reference) · View on Apple Maps
WFD catchment
Boyd - source to conf R Avon (Brist) (GB109053027510)
2024 spills / hours
26 / 296
Long-term average
15.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 53 hours spilling →
River Boyd 10 53 down 62% 100%
Market Street CSO
Overflow on sewer network
Company site name
BRADFORD-ON-AVON MARKET STREET JUNCTION WITH CHURCH STREET
EA ID / permit
WXW00686 · 101649
Outlet location
ST8261260932 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (Semington Bk to By Bk) (GB109053027372)
2024 spills / hours
64 / 109
Long-term average
48.4 spills a year (monitored since 2017)
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 53 hours spilling →
River Avon (via SWS) 47 53 down 27% 100%
35 Kings Road
Overflow on sewer network
Company site name
DORCHESTER KINGS ROAD NO 35
EA ID / permit
WXW00027 · 400689
Outlet location
SY7012290514 (OS grid reference) · View on Apple Maps
WFD catchment
Frome Dorset (Lower) u/s Louds Mill Dorchester (GB108044009691)
2024 spills / hours
45 / 99
Long-term average
31.4 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 53 hours spilling →
Mill Stream via SWS 29 53 down 36% 100%
Barton Farm CSO
Overflow on sewer network
Company site name
SAINT ALDHELMS BARTON BRIDGE BARTON FARM (175M DS)
EA ID / permit
WXW00105 · 101648
Outlet location
ST8211260482 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (Semington Bk to By Bk) (GB109053027372)
2024 spills / hours
16 / 177
Long-term average
7.4 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 53 hours spilling →
River Avon 8 53 down 50% 96%
Mead Lane Pumping Station
Storm discharge at pumping station
Company site name
SALTFORD MEAD LANE
EA ID / permit
WXW00700 · 011904
Outlet location
ST6884267539 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
13 / 182
Long-term average
5.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 53 hours spilling →
River Avon via SWS 6 53 down 54% 100%
All Cannings PS
Storm discharge at pumping station
Company site name
ALL CANNINGS
EA ID / permit
WXW00072 · 401226
Outlet location
SU0698061810 (OS grid reference) · View on Apple Maps
WFD catchment
Etchilhampton Water (GB108043022430)
2024 spills / hours
29 / 391
Long-term average
19.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 53 hours spilling →
River Avon (S) 6 53 down 79% 100%
Burton Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Burton
Company site name
BURTON INLET
EA ID / permit
WXW00216 · 102815
Outlet location
ST8188079530 (OS grid reference) · View on Apple Maps
WFD catchment
By Bk - source to conf Broadmead Bk (GB109053027500)
2024 spills / hours
18 / 129
Long-term average
20.3 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 52 hours spilling →
Burton Brook 13 52 down 28% 100%
Headley Road/Avon Road
Overflow on sewer network
Company site name
BRISTOL HEADLEY ROAD ALLOTMENTS RETENTION TANK
EA ID / permit
WXW00518 · 101822
Outlet location
ST5735068820 (OS grid reference) · View on Apple Maps
WFD catchment
The Malago - source to conf R Avon (Brist New Cut) (GB109053021970)
2024 spills / hours
33 / 120
Long-term average
23.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 52 hours spilling →
Malago (S) 20 52 down 39% 100%
Mere Combined Sewer Overflow
Overflow on sewer network
Company site name
MERE STW ADJ TO
EA ID / permit
WXW00712 · 401438
Outlet location
ST8151231822 (OS grid reference) · View on Apple Maps
WFD catchment
Shreen Water (including Ashfield Water) (GB108043022450)
2024 spills / hours
63 / 138
Long-term average
47.6 spills a year (monitored since 2018)
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 52 hours spilling →
Shreen Water 39 52 down 38% 100%
Blagdon - Sewage Treatment Works
Inlet overflow at sewage works
Sewage works
Blagdon
EA ID / permit
WXW01316 · Unpermitted
Outlet location
ST5007459903 (OS grid reference) · View on Apple Maps
WFD catchment
Yeo - source to conf Congresbury Yeo (GB109052021640)
2024 spills / hours
– / –
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 52 hours spilling →
Congresbury Yeo 12 52 100%
Bicknoller CSO
Overflow on sewer network
Company site name
BICKNOLLER SO
EA ID / permit
WXW00131 · 102303
Outlet location
ST1049939001 (OS grid reference) · View on Apple Maps
WFD catchment
Doniford Stream (GB108051020250)
2024 spills / hours
38 / 109
Long-term average
29.3 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation completed, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 52 hours spilling →
Trib of Doniford Stream (S) 17 52 down 55% 100%
Cranbrook Road CSO
Overflow on sewer network
Company site name
BRISTOL CRANBROOK ROAD O/S NO.67
EA ID / permit
WXW00338 · 011395
Outlet location
ST5861175071 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840)
2024 spills / hours
53 / 79
Long-term average
52.3 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 52 hours spilling →
Cranbrook via SWS 42 52 down 21% 100%
Wootton Bassett CSO
Overflow on sewer network
Company site name
ROYAL WOOTTON BASSETT NEAR STW
EA ID / permit
WXW01284 · 103417
Outlet location
SU0731181464 (OS grid reference) · View on Apple Maps
WFD catchment
Brinkworth Brook (GB109053027740)
2024 spills / hours
27 / 90
Long-term average
19.1 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 51 hours spilling →
Hancock'S Water 14 51 down 48% 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.