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
Southgate Street CSO
Overflow on sewer network
Company site name
BATH SOUTHGATE (NORTH END) ADJ LITTLEWOODS
EA ID / permit
WXW01020 · 102784
Outlet location
ST7510064337 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
31 / 62
Long-term average
18.4 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 3.8 hours spilling →
River Avon via SWS 15 3.8 down 52% 100%
Aldridges CSO
Overflow on sewer network
Company site name
BATH WALCOT ST RIVER BANK R/O ALDRIDGES
EA ID / permit
WXW00069 · 103044
Outlet location
ST7520965488 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
33 / 64
Long-term average
24.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.7 hours spilling →
River Avon 13 3.7 down 61% 94%
Abbey Road Combined Sewer Overflow
Overflow on sewer network
Company site name
SHERBORNE ABBEY ROAD
EA ID / permit
WXW00058 · NPSWQD002501
Outlet location
ST6370816577 (OS grid reference) · View on Apple Maps
WFD catchment
Yeo (GB108052015630)
2024 spills / hours
11 / 11
Long-term average
11.0 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.7 hours spilling →
Tributary of the River Yeo 11 3.7 no change 100%
Salisbury Avenue Combined Sewer of
Overflow on sewer network
Company site name
BRISTOL SALISBURY AVE O/S NO 30
EA ID / permit
WXW00950 · 103314
Outlet location
ST5611874456 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
35 / 14
Long-term average
11.0 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 3.7 hours spilling →
River Avon via SWS 15 3.7 down 57% 96%
Axe Road Combined Sewer Overflow
Overflow on sewer network
Company site name
WOOKEY AXE ROAD O/S RIVERSIDE COTTAGE
EA ID / permit
WXW00099 · 102492
Outlet location
ST5149545623 (OS grid reference) · View on Apple Maps
WFD catchment
Axe - source to Cocklake (GB109052021520)
2024 spills / hours
11 / 23
Long-term average
3.6 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.7 hours spilling →
River Axe 2 3.7 down 82% 97%
Holly Hill Road CSO
Overflow on sewer network
Company site name
BRISTOL KINGSWOOD HOLLY HILL ROAD / NEW CHELTENHAM ROAD JUNCTION
EA ID / permit
WXW00553 · 100898
Outlet location
ST6631974374 (OS grid reference) · View on Apple Maps
WFD catchment
Siston Bk - source to conf R Avon (Brist) (GB109053027450)
2024 spills / hours
12 / 8.1
Long-term average
8.0 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.6 hours spilling →
Warmley Brook via SWS 6 3.6 down 50% 100%
Lane End Pumping Station
Storm discharge at pumping station
Company site name
STOKE ST GREGORY NO 1 LANE END
EA ID / permit
WXW00614 · 101803
Outlet location
ST3410027190 (OS grid reference) · View on Apple Maps
WFD catchment
West Sedgemoor Main Drain (GB108052015450)
2024 spills / hours
3 / 21
Long-term average
1.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.6 hours spilling →
Storm Culvert (S) 3 3.6 no change 100%
Wickhouse Farm CSO
Overflow on sewer network
Company site name
SALTFORD WICKHOUSE FARM BATH ROAD
EA ID / permit
WXW01254 · 102129
Outlet location
ST6805068710 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
5 / 19
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 3.6 hours spilling →
River Avon via SWS 2 3.6 down 60% 100%
Charter Road CSO
Overflow on sewer network
Company site name
CHIPPENHAM THE IVY
EA ID / permit
WXW00258 · 100820
Outlet location
ST9191173041 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
2 / 3.1
Long-term average
0.6 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 3.6 hours spilling →
River Avon 1 3.6 down 50% 95%
Chippenham Water Recycling Centre
Inlet overflow at sewage works
Sewage works
Chippenham
Company site name
CHIPPENHAM BLACKWELL HAMS INLET
EA ID / permit
WXW00277 · 101637
Outlet location
ST9176371284 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
3 / 3.8
Long-term average
1.4 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.5 hours spilling →
River Avon 1 3.5 down 67% 100%
Fortfield Rd CSO
Overflow on sewer network
Company site name
BRISTOL FORTFIELD ROAD O/S NO 166
EA ID / permit
WXW00440 · 102979
Outlet location
ST5819669123 (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
3.4 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.5 hours spilling →
Pigeonhouse Stream via SWS 5 3.5 up from 0 100%
Bayford Pumping Station
Storm discharge at pumping station
Company site name
WINCANTON BAYFORD
EA ID / permit
WXW00116 · 402455
Outlet location
ST7248428854 (OS grid reference) · View on Apple Maps
WFD catchment
Cale (GB108043015850)
2024 spills / hours
5 / 11
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 3.5 hours spilling →
Tributary of the River Cale 3 3.5 down 40% 100%
Glanvilles Wootton Water Recycling
Inlet overflow at sewage works (with treatment)
Sewage works
Glanvilles Wootton Water Recycling
Company site name
GLANVILLES WOOTTON INLET
EA ID / permit
WXW01299 · 040036
Outlet location
ST6732308968 (OS grid reference) · View on Apple Maps
WFD catchment
Caundle Brook (Upper) (GB108043015910)
2024 spills / hours
2 / 3.3
Long-term average
2.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.4 hours spilling →
Trib of Caundle Brook 3 3.4 up 50% 100%
Scout Site Combined Sewer Overflow
Overflow on sewer network
Company site name
BATH ST JOHNS ROAD SCOUTS SITE
EA ID / permit
WXW00965 · 101188
Outlet location
ST7531365593 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
18 / 184
Long-term average
15.1 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Aug
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.4 hours spilling →
River Avon 4 3.4 down 78% 32%
Overndale Road CSO
Overflow on sewer network
Company site name
BRISTOL ROCKLAND ROAD
EA ID / permit
WXW00835 · EPRPB3332AU
Outlet location
ST6456877019 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840)
2024 spills / hours
16 / 56
Long-term average
10.5 spills a year (monitored since 2024)
Investigation
Operational investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.4 hours spilling →
Lincombe Barn Stream 5 3.4 down 69% 100%
Lyncombe Vale CSO
Overflow on sewer network
Company site name
BATH LYNCOMBE VALE O/S NO 1
EA ID / permit
WXW00666 · NPSWQD002499
Outlet location
ST7536064290 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
33 / 12
Long-term average
17.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.4 hours spilling →
River Avon via SWS 18 3.4 down 45% 93%
Ford Stream CSO
Overflow on sewer network
Company site name
STREET FORD STREAM ROAD
EA ID / permit
WXW00436 · 102380
Outlet location
ST4717036630 (OS grid reference) · View on Apple Maps
WFD catchment
South Drain (GB108052021181)
2024 spills / hours
12 / 14
Long-term average
13.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.2 hours spilling →
Bullmead Ditch(S) 11 3.2 down 8% 100%
Rowde Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Rowde
Company site name
ROWDE STORM TANK
EA ID / permit
WXW00942 · 101462
Outlet location
ST9679462749 (OS grid reference) · View on Apple Maps
WFD catchment
Summerham Brook (GB109053022220)
2024 spills / hours
12 / 163
Long-term average
3.9 spills a year (monitored since 2018)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.2 hours spilling →
Summerham Brook 1 3.2 down 92% 100%
Holdenhurst Road CSO
Overflow on sewer network
Company site name
BRISTOL HOLDENHURST ROAD / BROAD ROAD
EA ID / permit
WXW00551 · 102881
Outlet location
ST5611874456 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
26 / 6.2
Long-term average
18.8 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 3.1 hours spilling →
River Avon via SWS (Estuarine) 12 3.1 down 54% 100%
Coronation Crescent CSO
Overflow on sewer network
Company site name
WEYMOUTH CORONATION CRES 0/S NO.3
EA ID / permit
WXW00326 · 401287
Outlet location
SY6721080970 (OS grid reference) · View on Apple Maps
WFD catchment
Wey (GB108044010210)
2024 spills / hours
5 / 0.8
Long-term average
7.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.1 hours spilling →
Radipole Lake via SWS 14 3.1 up 180% 100%
Glaston Road CSO
Overflow on sewer network
Company site name
STREET GLASTON ROAD OPP 30
EA ID / permit
WXW00463 · 100742
Outlet location
ST4858337198 (OS grid reference) · View on Apple Maps
WFD catchment
South Drain (GB108052021181)
2024 spills / hours
9 / 17
Long-term average
6.7 spills a year (monitored since 2023)
Investigation
Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.1 hours spilling →
Trib of South Drain 6 3.1 down 33% 100%
Penn Knapp PS
Storm discharge at pumping station
Company site name
DILTON MARSH PEN KNAPP
EA ID / permit
WXW00853 · 103205
Outlet location
ST8585049850 (OS grid reference) · View on Apple Maps
WFD catchment
Biss Bk - source to conf unnamed trib (GB109053021750)
2024 spills / hours
5 / 19
Long-term average
1.8 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.1 hours spilling →
Biss Brook(S) 1 3.1 down 80% 100%
Chaplin Road Combined Sewer
Overflow on sewer network
Company site name
BRISTOL CHAPLIN ROAD O/S NO 60
EA ID / permit
WXW00247 · 101792
Outlet location
ST6042874443 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840)
2024 spills / hours
12 / 7.2
Long-term average
7.3 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 3.0 hours spilling →
River Frome 5 3.0 down 58% 100%
Sutton Waldron Pumping Station
Storm discharge at pumping station
Company site name
SUTTON WALDRON
EA ID / permit
WXW01092 · 041782
Outlet location
ST8643015260 (OS grid reference) · View on Apple Maps
WFD catchment
Fontmell Brook (GB108043016080)
2024 spills / hours
5 / 6.3
Long-term average
1.5 spills a year (monitored since 2022)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 3.0 hours spilling →
Tributary of Fontmell Brook 1 3.0 down 80% 100%
Weirside Court CSO
Overflow on sewer network
Company site name
BATH LOWER BRISTOL ROAD NEAR MILL LANE
EA ID / permit
WXW01202 · 010920
Outlet location
ST7275264761 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
14 / 7.3
Long-term average
4.6 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.9 hours spilling →
River Avon 3 2.9 down 79% 100%
Wookey - 24 Preywater Road - Combined Sewer Overflow
Overflow on sewer network
EA ID / permit
WXW01357 · Unpermitted
Outlet location
ST5157945648 (OS grid reference) · View on Apple Maps
WFD catchment
Axe - source to Cocklake (GB109052021520)
2024 spills / hours
– / –
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.9 hours spilling →
River Axe 2 2.9 100%
Bath Foxhill CSO (new)
Overflow on sewer network
EA ID / permit
WXW01314 · Unpermitted
Outlet location
ST7538464296 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
– / –
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
River Avon via SWS 4 2.8 100%
Neath Road Combined Sewer Overflow
Overflow on sewer network
Company site name
BRISTOL NEATH ROAD / WHITEHALL ROAD
EA ID / permit
WXW00779 · 101799
Outlet location
ST5611874456 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
24 / 17
Long-term average
18.3 spills a year (monitored since 2019)
Monitor below 90%
Sensor failure / issue · Resolved - Nov
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
River Avon via SWS (Estuarine) 4 2.8 down 83% 50%
Russell Mill Lane CSO
Overflow on sewer network
Company site name
LITTLETON PANELL RUSSELL MILL LANE
EA ID / permit
WXW00947 · 101766
Outlet location
SU0015454163 (OS grid reference) · View on Apple Maps
WFD catchment
Semington Bk - source to conf Worton Str (GB109053022130)
2024 spills / hours
21 / 5.1
Long-term average
15.0 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
Semington Brook via SWS 11 2.8 down 48% 100%
Curload Pumping Station
Storm discharge at pumping station
Company site name
STOKE ST GREGORY CURLOAD
EA ID / permit
WXW00357 · 102570
Outlet location
ST3393627986 (OS grid reference) · View on Apple Maps
WFD catchment
Not part of a river WB catchment
2024 spills / hours
8 / 13
Long-term average
4.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.8 hours spilling →
River Tone 4 2.8 down 50% 100%
Thingley Water Recycling Centre
Inlet overflow at sewage works
Sewage works
Thingley
Company site name
THINGLEY COPPERSHELL LANE INLET
EA ID / permit
WXW01132 · 102328
Outlet location
ST9190067590 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
8 / 33
Long-term average
4.5 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.8 hours spilling →
Byde Mill Brook/River Avon 2 2.8 down 75% 100%
20 New Cheltenham Road CSO
Overflow on sewer network
Company site name
BRISTOL KINGSWOOD NEW CHELTENHAM ROAD NO 20
EA ID / permit
WXW00016 · 100893
Outlet location
ST6631974374 (OS grid reference) · View on Apple Maps
WFD catchment
Siston Bk - source to conf R Avon (Brist) (GB109053027450)
2024 spills / hours
16 / 3.7
Long-term average
30.5 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.6 hours spilling →
Warmley Brook 10 2.6 down 38% 100%
Whitby Road Combined Sewer Overflow
Overflow on sewer network
Company site name
BRISTOL WHITBY ROAD ST ANNES
EA ID / permit
WXW01246 · 021440
Outlet location
ST6152072542 (OS grid reference) · View on Apple Maps
WFD catchment
Not part of a river WB catchment
2024 spills / hours
15 / 9.0
Long-term average
10.9 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.6 hours spilling →
River Avon via SWS 6 2.6 down 60% 100%
Maiden Bradley CSO
Overflow on sewer network
Company site name
MAIDEN BRADLEY OFF KINGSTON LANE
EA ID / permit
WXW00672 · 041306
Outlet location
ST8071538587 (OS grid reference) · View on Apple Maps
WFD catchment
Wylye (Headwaters) (GB108043022520)
2024 spills / hours
18 / 2.5
Long-term average
10.2 spills a year (monitored since 2020)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Sep
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.5 hours spilling →
Tributary of River Wylye 12 2.5 down 33% 89%
Splott Farm CSO
Overflow on sewer network
Company site name
CAM VALLEY SPLOT FARM NR PEASEDOWN ST JOHN
EA ID / permit
WXW01029 · 013266
Outlet location
ST7014758586 (OS grid reference) · View on Apple Maps
WFD catchment
Cam Bk - source to conf Wellow Bk (GB109053022290)
2024 spills / hours
7 / 3.6
Long-term average
2.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.5 hours spilling →
Trib of Cam Brook 2 2.5 down 71% 100%
30 Station Road CSO
Overflow on sewer network
Company site name
BRISTOL STATION ROAD O/S NO 30
EA ID / permit
WXW00024 · 102094
Outlet location
ST5263276269 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
18 / 3.6
Long-term average
16.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.5 hours spilling →
River Avon via SWS (Estuarine) 12 2.5 down 33% 92%
Batheaston Gardens CSO
Overflow on sewer network
Company site name
BATHEASTON BATHEASTON GARDEN
EA ID / permit
WXW00114 · 100503/CS/01
Outlet location
ST7791267388 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
5 / 13
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 2.5 hours spilling →
River Avon 1 2.5 down 80% 97%
Westbury Water Recycling Centre
Inlet overflow at sewage works
Sewage works
Westbury
Company site name
WESTBURY INLET
EA ID / permit
WXW01234 · 101652
Outlet location
ST8717252598 (OS grid reference) · View on Apple Maps
WFD catchment
Bitham Bk - source to conf Biss Bk (GB109053021770)
2024 spills / hours
8 / 22
Long-term average
4.0 spills a year (monitored since 2022)
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.5 hours spilling →
Bitham Brook/Trib Bitham Brook 1 2.5 down 88% 98%
7 Springfield Avenue CSO
Overflow on sewer network
Company site name
BRISTOL SPRINGFIELD AVENUE O/S NO 7
EA ID / permit
WXW00049 · 102093
Outlet location
ST5263276269 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
16 / 2.6
Long-term average
20.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.5 hours spilling →
River Avon via SWS (Estuarine) 12 2.5 down 25% 98%
Bath Road CSO
Overflow on sewer network
Company site name
SALTFORD SALTFORD HILL
EA ID / permit
WXW00111 · 102125
Outlet location
ST6900366654 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
39 / 50
Long-term average
54.0 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 2.4 hours spilling →
River Avon 9 2.4 down 77% 95%
Clevedon Beach Pumping Station
Storm discharge at pumping station
Company site name
CLEVEDON THE BEACH SPS
EA ID / permit
WXW00298 · 100767
Outlet location
ST4021071730 ST4009071700 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
Bathing water
Clevedon Beach
2024 spills / hours
8 / 3.7
Long-term average
8.0 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.4 hours spilling →
Bristol Channel (E) 5 2.4 down 38% 100%
Lawrence Grove CSO
Overflow on sewer network
Company site name
BRISTOL LAWRENCE GROVE O/S NO 21
EA ID / permit
WXW00623 · 100476
Outlet location
ST5801877358 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
2 / 0.6
Long-term average
4.0 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.3 hours spilling →
Trib of River Trym via SWS 6 2.3 up 200% 100%
Rodden Road CSO
Overflow on sewer network
Company site name
FROME RODDEN ROAD
EA ID / permit
WXW00934 · 102704
Outlet location
ST7828048134 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Maiden Bradley to Mells) (GB109053022101)
2024 spills / hours
5 / 8.0
Long-term average
13.9 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.2 hours spilling →
River Frome(via SWS) 2 2.2 down 60% 100%
St George'S Park 2 CSO
Overflow on sewer network
Company site name
BRISTOL ST GEORGES PARK NORTH 329 CHURCH ROAD
EA ID / permit
WXW01037 · 102884
Outlet location
ST5611874456 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
12 / 3.6
Long-term average
11.3 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 2.2 hours spilling →
River Avon via SWS 12 2.2 no change 100%
Portway Locks Hill CSO
Overflow on sewer network
Company site name
FROME PORTWAY / LOCKS HILL
EA ID / permit
WXW00880 · 102702
Outlet location
ST7865147772 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Maiden Bradley to Mells) (GB109053022101)
2024 spills / hours
19 / 5.3
Long-term average
18.0 spills a year (monitored since 2024)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.2 hours spilling →
River Frome 17 2.2 down 11% 100%
Brook Road Combined Sewer Overflow
Overflow on sewer network
Company site name
BRISTOL BROOK ROAD / WHITEFIELD ROAD
EA ID / permit
WXW00199 · 101791
Outlet location
ST5611874456 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
20 / 6.3
Long-term average
14.8 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.1 hours spilling →
River Avon (Estuarine) via SWS 15 2.1 down 25% 100%
Amesbury STW
Storm tank at sewage works
Sewage works
Amesbury
Company site name
AMESBURY OFF CHURCH STREET STORM TANK
EA ID / permit
WXW00081 · 401518
Outlet location
SU1516540808 (OS grid reference) · View on Apple Maps
WFD catchment
Hampshire Avon (Upper) d/s Nine Mile River confl (GB108043022352)
2024 spills / hours
2 / 9.9
Long-term average
1.2 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 2.1 hours spilling →
Hampshire Avon (S) 1 2.1 down 50% 100%
Cairns Road Combined Sewer Overflow
Overflow on sewer network
Company site name
BRISTOL CAIRNS ROAD O/S 42
EA ID / permit
WXW00220 · NPSWQD010511
Outlet location
ST5861075072 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840)
2024 spills / hours
4 / 0.8
Long-term average
5.8 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.1 hours spilling →
Cranbrook 8 2.1 up 100% 100%
Valley Sewer CSO
Overflow on sewer network
Company site name
DEVIZES VALLEY SEWER
EA ID / permit
WXW01174 · 101768
Outlet location
ST9994061300 (OS grid reference) · View on Apple Maps
WFD catchment
Poulshot Str - source to conf Summerham Bk (GB109053022190)
2024 spills / hours
11 / 9.3
Long-term average
3.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.1 hours spilling →
Poulshot Stream 4 2.1 down 64% 100%
Porlock Combined Sewer Overflow
Overflow on sewer network
Company site name
PORLOCK SO
EA ID / permit
WXW00871 · 100354
Outlet location
SS8835047490 (OS grid reference) · View on Apple Maps
WFD catchment
Hawcombe STR (GB108051020300)
Bathing water
Porlock Weir
2024 spills / hours
18 / 3.9
Long-term average
13.6 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 2.1 hours spilling →
Hawkcombe Stream(S) 13 2.1 down 28% 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.