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
Recreation Ground 1 CSO
Overflow on sewer network
Company site name
BOX VALENS TERRACE
EA ID / permit
WXW00922 · 101695
Outlet location
ST8232768729 (OS grid reference) · View on Apple Maps
WFD catchment
By Bk - conf Doncombe Bk to conf R Avon (Brist) (GB109053027380)
2024 spills / hours
59 / 265
Long-term average
50.3 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 51 hours spilling →
By Brook 29 51 down 51% 97%
Calveswater Pumping Station
Storm discharge at pumping station
Company site name
WARMINSTER CALVESWATER
EA ID / permit
WXW00224 · 401094
Outlet location
ST8814044220 (OS grid reference) · View on Apple Maps
WFD catchment
Wylye Trib (The Were or Swan) (GB108043022540)
2024 spills / hours
54 / 224
Long-term average
32.3 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 51 hours spilling →
The Were via SWS 22 51 down 59% 100%
East Chaldon Pumping Station
Storm discharge at pumping station
Company site name
EAST CHALDON
EA ID / permit
WXW00390 · 401427
Outlet location
SY7948083470 (OS grid reference) · View on Apple Maps
WFD catchment
Frome Dorset Trib (River Win) (GB108044009650)
2024 spills / hours
30 / 265
Long-term average
11.4 spills a year (monitored since 2021)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 50 hours spilling →
A Tributary of the River Win 10 50 down 67% 100%
Woolley Street CSO
Overflow on sewer network
Company site name
BRADFORD-ON-AVON SPRING FIELD AND WOOLLEY STREET JUNCTION
EA ID / permit
WXW01283 · 101645
Outlet location
ST8290860796 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (Semington Bk to By Bk) (GB109053027372)
2024 spills / hours
38 / 92
Long-term average
21.6 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 50 hours spilling →
River Avon (via SWS) 18 50 down 53% 95%
2 Cranbrook Road CSO
Overflow on sewer network
Company site name
BRISTOL CRANBROOK ROAD O/S NO 2
EA ID / permit
WXW00015 · 100872
Outlet location
ST5611874456 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
57 / 65
Long-term average
51.3 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 50 hours spilling →
River Avon via SWS (Estuarine) 48 50 down 16% 100%
Moorland Way Pumping Station
Storm discharge at pumping station
Company site name
UPTON MOORLANDS WAY
EA ID / permit
WXW00755 · 401241
Outlet location
SY9757092640 (OS grid reference) · View on Apple Maps
WFD catchment
POOLE HARBOUR (GB520804415800)
Bathing water
Poole Harbour Rockley Sands
Shellfish water
Poole Bay; Poole Harbour North; Poole Harbour South; Poole Harbour West
2024 spills / hours
31 / 143
Long-term average
26.7 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 50 hours spilling →
Lytchett Bay(C) 17 50 down 45% 100%
Semington Road Pumping Station
Storm discharge at pumping station
Company site name
MELKSHAM SEMINGTON ROAD
EA ID / permit
WXW00972 · 100635
Outlet location
ST9014062340 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
16 / 136
Long-term average
13.3 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 49 hours spilling →
(S) Berryfield Brook 6 49 down 63% 100%
Chew Magna PS
Storm discharge at pumping station
Company site name
CHEW MAGNA DUMPERS LANE
EA ID / permit
WXW00263 · 102223
Outlet location
ST5782062900 (OS grid reference) · View on Apple Maps
WFD catchment
Chew - Chew Valley Lake to conf Winford Brook (GB109053021852)
2024 spills / hours
71 / 319
Long-term average
30.6 spills a year (monitored since 2021)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 49 hours spilling →
River Chew(S) 14 49 down 80% 100%
43 New Cheltenham Road CSO
Overflow on sewer network
Company site name
BRISTOL KINGSWOOD NEW CHELTENHAM ROAD O/S 43
EA ID / permit
WXW00040 · 100895
Outlet location
ST6631974374 (OS grid reference) · View on Apple Maps
WFD catchment
Siston Bk - source to conf R Avon (Brist) (GB109053027450)
2024 spills / hours
60 / 106
Long-term average
56.8 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 49 hours spilling →
Warmley Brook via SWS 50 49 down 17% 97%
Avon Street CSO
Overflow on sewer network
Company site name
BATH AVON STREET O/S BATH TECHNICAL COLLEGE
EA ID / permit
WXW00093 · 102780
Outlet location
ST7479064440 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
75 / 243
Long-term average
53.2 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 49 hours spilling →
River Avon via SWS 48 49 down 36% 100%
Lacock Water Recycling Centre
Storm tank at sewage works
Sewage works
Lacock
Company site name
LACOCK STORM TANK
EA ID / permit
WXW00606 · 011342
Outlet location
ST9195867643 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
75 / 1,296
Long-term average
43.3 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
UWWTR improvement ongoing
Volume & pollution
Estimate from 49 hours spilling →
Bristol Avon 8 49 down 89% 100%
Marshfield WwTW
Storm tank at sewage works
Sewage works
Marshfield
Company site name
MARSHFIELD STORM TANK
EA ID / permit
WXW00692 · 102728
Outlet location
ST7853173162 (OS grid reference) · View on Apple Maps
WFD catchment
Doncombe Bk - source to conf By Bk (GB109053027400)
2024 spills / hours
25 / 124
Long-term average
12.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 48 hours spilling →
Doncombe Brook 7 48 down 72% 100%
Silver Street CSO
Overflow on sewer network
Company site name
BRADFORD-ON-AVON MARKET STREET/ SILVER STREET JUNCTION
EA ID / permit
WXW00996 · 101651
Outlet location
ST8263760963 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (Semington Bk to By Bk) (GB109053027372)
2024 spills / hours
24 / 236
Long-term average
12.4 spills a year (monitored since 2019)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Dec
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 48 hours spilling →
River Avon (via SWS) 8 48 down 67% 85%
Great Hinton Pumping Station
Storm discharge at pumping station
Company site name
GREAT HINTON
EA ID / permit
WXW00479 · NPSWQD008924
Outlet location
ST9091459220 (OS grid reference) · View on Apple Maps
WFD catchment
Semington Bk-Milebourne Str to conf R Avon (Brist) (GB109053022200)
2024 spills / hours
26 / 236
Long-term average
9.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 48 hours spilling →
Tributary of Semington Brook 6 48 down 77% 100%
Mina Road Sewer Storm Overflow
Overflow on sewer network
Company site name
BRISTOL MINA ROAD O/S NO 212
EA ID / permit
WXW00743 · 101850
Outlet location
ST5612074460 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
53 / 161
Long-term average
47.2 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 48 hours spilling →
River Avon via SWS (Estuarine) 35 48 down 34% 100%
Christchurch Sewage Treatment Works
Storm tank at sewage works
Sewage works
Christchurch
Company site name
CHRISTCHURCH STONEY LANE STORM TANK
EA ID / permit
WXW00279 · 401355
Outlet location
SZ1620093040 (OS grid reference) · View on Apple Maps
WFD catchment
CHRISTCHURCH HARBOUR (GB520804315900)
Bathing water
Christchurch Avon Beach; Christchurch Friar`s Cliff
2024 spills / hours
35 / 470
Long-term average
22.1 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 48 hours spilling →
River Avon(E) 5 48 down 86% 100%
Stoke Brook CSO
Overflow on sewer network
Company site name
FILTON STOKE BROOK
EA ID / permit
WXW01067 · 103135
Outlet location
ST6096080140 (OS grid reference) · View on Apple Maps
WFD catchment
Stoke Bk - source to conf Bradley Bk (GB109053027540)
2024 spills / hours
34 / 68
Long-term average
29.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 47 hours spilling →
Stoke Brook(S) 24 47 down 29% 100%
The Hams Pumping Station
Storm discharge at pumping station
Company site name
KEYNSHAM THE HAMS
EA ID / permit
WXW01122 · 013093
Outlet location
ST6493569732 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
103 / 122
Long-term average
66.5 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 47 hours spilling →
River Avon 50 47 down 51% 100%
Sainsbury Mill CSO
Overflow on sewer network
Company site name
WICK SAINSBURY MILL
EA ID / permit
WXW00948 · 102839
Outlet location
ST6944772543 (OS grid reference) · View on Apple Maps
WFD catchment
Boyd - source to conf R Avon (Brist) (GB109053027510)
2024 spills / hours
27 / 165
Long-term average
16.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 47 hours spilling →
The River Boyd (S) 6 47 down 78% 100%
Ashton Avenue Pumping Station
Storm discharge at pumping station
Company site name
BRISTOL ASHTON AVENUE
EA ID / permit
WXW00088 · 102970
Outlet location
ST5689072030 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
45 / 167
Long-term average
37.6 spills a year (monitored since 2021)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 47 hours spilling →
River Avon 23 47 down 49% 100%
Harman'S Cross Pumping Station
Storm discharge at pumping station
Company site name
HARMANS CROSS TRANSFER STATION
EA ID / permit
WXW00507 · 401237
Outlet location
SY9911079940 (OS grid reference) · View on Apple Maps
WFD catchment
Swan (Swanage) (GB108044009920)
2024 spills / hours
15 / 80
Long-term average
12.5 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 46 hours spilling →
Unnamed Stream (S) 10 46 down 33% 99%
Forest Road CSO
Overflow on sewer network
Company site name
BRISTOL FOREST ROAD STORM RETENTION TANK
EA ID / permit
WXW00439 · 101276
Outlet location
ST6238075802 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840)
2024 spills / hours
34 / 119
Long-term average
24.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 46 hours spilling →
Fishponds Brook via SWS 16 46 down 53% 100%
Stawell Pumping Station
Storm discharge at pumping station
Company site name
STAWELL FORD LANE
EA ID / permit
WXW01062 · 101711
Outlet location
ST3671038610 (OS grid reference) · View on Apple Maps
WFD catchment
King's Sedgemoor Drain - Henley Sluice to mouth (GB108052021150)
2024 spills / hours
21 / 109
Long-term average
13.0 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 46 hours spilling →
Trib of King Sedgemoors Drain 7 46 down 67% 100%
Alma Road Combined Sewer Overflow
Overflow on sewer network
Company site name
BRISTOL KINGSWOOD ALMA ROAD / NEW CHELTENHAM ROAD JUNCTION
EA ID / permit
WXW00076 · 100897
Outlet location
ST6631974374 (OS grid reference) · View on Apple Maps
WFD catchment
Siston Bk - source to conf R Avon (Brist) (GB109053027450)
2024 spills / hours
49 / 114
Long-term average
43.5 spills a year (monitored since 2024)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 46 hours spilling →
Warmley Brook via SWS 38 46 down 22% 100%
Eastville Park CSO
Overflow on sewer network
Company site name
BRISTOL EASTVILLE PARK FISHPONDS BROOK
EA ID / permit
WXW00399 · 100457
Outlet location
ST6183675667 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - Bradley Bk to conf Floating Hbr (GB109053027840)
2024 spills / hours
11 / 39
Long-term average
7.0 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 46 hours spilling →
River Frome 13 46 up 18% 100%
Mill Lane Combined Sewer Overflow
Overflow on sewer network
Company site name
MONKTON COMBE MILL LANE
EA ID / permit
WXW00729 · 021680
Outlet location
ST7725661731 (OS grid reference) · View on Apple Maps
WFD catchment
Wellow Bk - Snails Bk to Bristol Avon (GB109053022271)
2024 spills / hours
61 / 106
Long-term average
55.3 spills a year (monitored since 2019)
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 46 hours spilling →
Midford Brook (via SWS) 49 46 down 20% 95%
Coxley Ripple Pumping Station
Storm discharge at pumping station
Company site name
COXLEY RIPPLE
EA ID / permit
WXW00335 · 102367
Outlet location
ST5233443283 (OS grid reference) · View on Apple Maps
WFD catchment
Sheppey (GB108052021221)
2024 spills / hours
18 / 176
Long-term average
7.8 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 45 hours spilling →
Trib of River Sheppey 5 45 down 72% 100%
Radstock Water Recycling Centre
Inlet overflow at sewage works
Sewage works
Radstock
Company site name
RADSTOCK MILL LANE INLET 2
EA ID / permit
WXW00912 · 102630
Outlet location
ST6990255131 (OS grid reference) · View on Apple Maps
WFD catchment
Wellow Bk - Snails Bk to Bristol Avon (GB109053022271)
2024 spills / hours
11 / 38
Long-term average
18.2 spills a year (monitored since 2021)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 45 hours spilling →
Wellow Brook 14 45 up 27% 100%
Quemerford Bridge CSO
Overflow on sewer network
Company site name
CALNE QUEMERFORD BRIDGE
EA ID / permit
WXW00908 · 102552
Outlet location
SU0065569807 (OS grid reference) · View on Apple Maps
WFD catchment
Marden - source to conf Cowage Bk (GB109053022050)
2024 spills / hours
49 / 390
Long-term average
34.4 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 45 hours spilling →
River Marden 12 45 down 76% 97%
Maiden Bradley WwTW
Inlet overflow at sewage works (with treatment)
Sewage works
Maiden Bradley
Company site name
MAIDEN BRADLEY INLET
EA ID / permit
WXW00673 · 400608
Outlet location
ST8106038540 (OS grid reference) · View on Apple Maps
WFD catchment
Wylye (Headwaters) (GB108043022520)
2024 spills / hours
2 / 3.8
Long-term average
54.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 45 hours spilling →
Groundwater via Infilt System 26 45 up 1200% 100%
Portway Combined Sewer Overflow
Overflow on sewer network
Company site name
BRISTOL PORTWAY NEAR RAILWAY
EA ID / permit
WXW00879 · 102112
Outlet location
ST5255176337 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
85 / 148
Long-term average
77.7 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
No improvement action in reporting period
Volume & pollution
Estimate from 45 hours spilling →
River Avon via SWS 47 45 down 45% 100%
Bournemouth Iford Lane
Overflow on sewer network
EA ID / permit
WXW00576 · Permit applied for
Outlet location
SZ1439092710 (OS grid reference) · View on Apple Maps
WFD catchment
Christchurch Harbour (GB520804315900)
Bathing water
Christchurch Avon Beach; Christchurch Friar`s Cliff
2024 spills / hours
17 / 50
Long-term average
16.0 spills a year (monitored since 2024)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 45 hours spilling →
River Stour 15 45 down 12% 100%
Cotham Hill CSO
Overflow on sewer network
Company site name
BRISTOL COTHAM HILL / HAMPTON PARK
EA ID / permit
WXW00330 · 102255
Outlet location
ST5612074460 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
43 / 79
Long-term average
36.8 spills a year (monitored since 2018)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 45 hours spilling →
River Avon via SWS (Estuarine) 31 45 down 28% 100%
Brooklands Pumping Station O/F
Storm discharge at pumping station
Company site name
DUNKERTON BROOKLANDS
EA ID / permit
WXW00203 · 021688
Outlet location
ST7105459348 (OS grid reference) · View on Apple Maps
WFD catchment
Cam Bk - source to conf Wellow Bk (GB109053022290)
2024 spills / hours
31 / 494
Long-term average
15.0 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 44 hours spilling →
Trib of Midford Brook (S) 7 44 down 77% 100%
West Buckland Pumping Station
Storm discharge at pumping station
Company site name
WEST BUCKLAND
EA ID / permit
WXW01220 · 101804
Outlet location
ST1788020900 (OS grid reference) · View on Apple Maps
WFD catchment
Hele Bk (GB108052015400)
2024 spills / hours
18 / 143
Long-term average
13.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 44 hours spilling →
Trib of River Tone (S) 9 44 down 50% 100%
Calne Wastewater Treatment Works
Inlet overflow at sewage works
Sewage works
Calne
Company site name
CALNE INLET
EA ID / permit
WXW00222 · 103731
Outlet location
ST9791071440 (OS grid reference) · View on Apple Maps
WFD catchment
Marden - source to conf Cowage Bk (GB109053022050)
2024 spills / hours
38 / 120
Long-term average
27.4 spills a year (monitored since 2018)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 44 hours spilling →
River Marden(S) 21 44 down 45% 100%
Unit 601/601A Central Park CSO
Overflow on sewer network
Company site name
BRISTOL PETHERTON ROAD PAINT FACTORY
EA ID / permit
WXW01169 · 100574
Outlet location
ST6031069780 (OS grid reference) · View on Apple Maps
WFD catchment
Brislington Bk - source to conf R Avon (Brist) (GB109053021980)
2024 spills / hours
41 / 109
Long-term average
35.3 spills a year (monitored since 2023)
Investigation
Operational investigation completed
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 44 hours spilling →
Brislington Brook, via SWS 29 44 down 29% 100%
Sherston Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Sherston
Company site name
SHERSTON STORM TANK
EA ID / permit
WXW00986 · 011559
Outlet location
ST8588985657 (OS grid reference) · View on Apple Maps
WFD catchment
Sherston Avon (GB109053027690)
2024 spills / hours
25 / 139
Long-term average
28.5 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 43 hours spilling →
Avon (Sherston Branch) 14 43 down 44% 100%
Chard Old STW CSO
Overflow on sewer network
Company site name
CHARD OLD STW BEECHING CL
EA ID / permit
WXW00248 · 100638
Outlet location
ST3333909650 (OS grid reference) · View on Apple Maps
WFD catchment
Isle - Upper (GB108052015160)
2024 spills / hours
34 / 41
Long-term average
37.7 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 43 hours spilling →
Tributary of River Isle 30 43 down 12% 100%
Pembroke Road CSO
Overflow on sewer network
Company site name
BRISTOL PEMBROKE ROAD NO 19
EA ID / permit
WXW00851 · 103307
Outlet location
ST5806772114 (OS grid reference) · View on Apple Maps
WFD catchment
Not part of a river WB catchment
2024 spills / hours
29 / 119
Long-term average
22.0 spills a year (monitored since 2024)
Investigation
Operational investigation completed
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 43 hours spilling →
River Avon via SWS 15 43 down 48% 100%
Lower Bristol Road
Overflow on sewer network
Company site name
BATH EA DEPOT
EA ID / permit
WXW00649 · 102275
Outlet location
ST7240064870 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
12 / 78
Long-term average
6.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 43 hours spilling →
River Avon (S) 6 43 down 50% 100%
Ladye Bay Pumping Station
Storm discharge at pumping station
Company site name
CLEVEDON LADYE BAY
EA ID / permit
WXW00608 · 102489
Outlet location
ST4074072820 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
Bathing water
Clevedon Beach
2024 spills / hours
41 / 68
Long-term average
33.4 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 42 hours spilling →
Bristol Channel (E) 23 42 down 44% 100%
Ducks Lane
Storm discharge at pumping station
Company site name
DRAYTON DUCKS LANE
EA ID / permit
WXW00383 · 102400
Outlet location
ST4067024520 (OS grid reference) · View on Apple Maps
WFD catchment
Parrett - R Yeo to West Sedgemoor Drain (GB108052015470)
2024 spills / hours
15 / 167
Long-term average
3.9 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 42 hours spilling →
Drayton Drain (S) 6 42 down 60% 100%
Barford St Martin Pumping Station
Storm discharge at pumping station
Company site name
BARFORD ST MARTIN
EA ID / permit
WXW00103 · 050763
Outlet location
SU0570431168 (OS grid reference) · View on Apple Maps
WFD catchment
Nadder (Middle) (GB108043022470)
2024 spills / hours
23 / 295
Long-term average
12.8 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 42 hours spilling →
River Nadder 4 42 down 83% 100%
Charfield Water Recycling Centre
Storm tank at sewage works
Sewage works
Charfield
Company site name
CHARFIELD STORM TANK
EA ID / permit
WXW00250 · 102536
Outlet location
ST7202493205 (OS grid reference) · View on Apple Maps
WFD catchment
Little Avon - Ozleworth Bk to conf Tortworth Bk (GB109054026600)
2024 spills / hours
24 / 213
Long-term average
11.5 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 41 hours spilling →
Little Avon 7 41 down 71% 100%
Glen Cottage CSO
Overflow on sewer network
Company site name
WOOKEY HOLE GLEN COTTAGE GLENCOTT LANE
EA ID / permit
WXW00467 · 102592
Outlet location
ST5313846920 (OS grid reference) · View on Apple Maps
WFD catchment
Axe - source to Cocklake (GB109052021520)
2024 spills / hours
56 / 173
Long-term average
35.4 spills a year (monitored since 2019)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Jun
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 41 hours spilling →
River Axe 28 41 down 50% 87%
Rushcombe Bottom Pumping Station
Storm discharge at pumping station
Company site name
CORFE MULLEN RUSHCOMBE BOTTOM
EA ID / permit
WXW00946 · 401393
Outlet location
SY9938097180 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Middle d/s Pimperne Brook) (GB108043016052)
2024 spills / hours
31 / 91
Long-term average
23.8 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 41 hours spilling →
Rushcombe Stream 17 41 down 45% 100%
Bowerhill Wastewater Treatment Work
Inlet overflow at sewage works
Sewage works
Bowerhill Wastewater Treatment Work
Company site name
BOWERHILL SHAILS LANE INLET
EA ID / permit
WXW00159 · 102735
Outlet location
ST9031162368 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
29 / 186
Long-term average
16.1 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 40 hours spilling →
Berryfield Stream(S) 12 40 down 59% 100%
Harcombe Farm CSO
Overflow on sewer network
Company site name
WINTERBOURNE HARCOMBE FARM HICKS COMMON IN FIELD
EA ID / permit
WXW00504 · 103069
Outlet location
ST6568680016 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - conf Laddon Bk to conf Folly Bk (GB109053027820)
2024 spills / hours
50 / 98
Long-term average
50.0 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 40 hours spilling →
River Frome 42 40 down 16% 100%
Meadow Farm Pumping Station
Storm discharge at pumping station
Company site name
WOOLAVINGTON MEADOW FARM
EA ID / permit
WXW00701 · 101713
Outlet location
ST3477041910 (OS grid reference) · View on Apple Maps
WFD catchment
Huntspill (GB108052021210)
2024 spills / hours
8 / 74
Long-term average
6.2 spills a year (monitored since 2021)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 40 hours spilling →
Trib of Huntspill River(S) 5 40 down 38% 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.