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
Misterton Pumping Station
Storm discharge at pumping station
Company site name
MISTERTON
EA ID / permit
WXW00745 · 103598
Outlet location
ST4617008560 (OS grid reference) · View on Apple Maps
WFD catchment
Parrett - headwaters to Broad River (GB108052015260)
2024 spills / hours
24 / 86
Long-term average
25.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 118 hours spilling →
Trib of River Parrett 25 118 up 4% 100%
Bishop Sutton Pumping Station
Storm discharge at pumping station
Company site name
BISHOP SUTTON
EA ID / permit
WXW00135 · EPRZP3821GK
Outlet location
ST5814260252 (OS grid reference) · View on Apple Maps
WFD catchment
Chew - Chew Valley Lake to conf Winford Brook (GB109053021852)
2024 spills / hours
77 / 184
Long-term average
75.3 spills a year (monitored since 2017)
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 118 hours spilling →
A Tributary of the River Chew 62 118 down 19% 100%
The Green CSO
Overflow on sewer network
Company site name
WICK THE GREEN
EA ID / permit
WXW01119 · 102838
Outlet location
ST6952072600 (OS grid reference) · View on Apple Maps
WFD catchment
Boyd - source to conf R Avon (Brist) (GB109053027510)
2024 spills / hours
48 / 290
Long-term average
44.7 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 115 hours spilling →
The River Boyd (S) 40 115 down 17% 99%
Wells STW
Storm tank at sewage works
Sewage works
Wells
Company site name
WELLS STORM TANK
EA ID / permit
WXW01208 · 101432
Outlet location
ST5335344859 ST5340144895 (OS grid reference) · View on Apple Maps
WFD catchment
Keward Brook (GB108052021240)
2024 spills / hours
46 / 514
Long-term average
26.5 spills a year (monitored since 2022)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 115 hours spilling →
Wells Moat Stream(S) 16 115 down 65% 99%
Brassmill Lane (East) CSO
Overflow on sewer network
Company site name
BATH BRASSMILL LANE OPP NO 22
EA ID / permit
WXW00167 · 102782
Outlet location
ST7241064930 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
48 / 408
Long-term average
29.4 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 115 hours spilling →
River Avon 18 115 down 63% 100%
Long Cross Pumping Station
Storm discharge at pumping station
Company site name
SHAFTESBURY LONG CROSS
EA ID / permit
WXW00638 · 401300
Outlet location
ST8495023250 (OS grid reference) · View on Apple Maps
WFD catchment
Key Brook (GB108043016100)
2024 spills / hours
66 / 243
Long-term average
50.8 spills a year (monitored since 2018)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 115 hours spilling →
Key Brook to R Stour (S) 36 115 down 45% 100%
Horton Farm Pumping Station
Storm discharge at pumping station
Company site name
HORTON HORTON FARM
EA ID / permit
WXW00562 · 401149
Outlet location
SU0506063510 (OS grid reference) · View on Apple Maps
WFD catchment
Etchilhampton Water (GB108043022430)
2024 spills / hours
189 / 376
Long-term average
128.0 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 114 hours spilling →
Trib of Etchilhampton Water(S) 75 114 down 60% 100%
Hinton Blewett WRC
Inlet overflow at sewage works
Sewage works
Hinton Blewett
Company site name
HINTON BLEWETT INLET
EA ID / permit
WXW00546 · 010299
Outlet location
ST5939156677 (OS grid reference) · View on Apple Maps
WFD catchment
Cam Bk - source to conf Wellow Bk (GB109053022290)
2024 spills / hours
45 / 175
Long-term average
38.3 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 114 hours spilling →
The Cam Brook 43 114 down 4% 100%
Trowbridge Wastewater Trtmnt Works
Inlet overflow at sewage works
Sewage works
Trowbridge Wastewater Trtmnt Works
Company site name
TROWBRIDGE BRADFORD ROAD INLET
EA ID / permit
WXW01155 · 102153
Outlet location
ST8491358447 (OS grid reference) · View on Apple Maps
WFD catchment
Biss (Bitham Bk to Bristol Avon) (GB109053021791)
2024 spills / hours
31 / 282
Long-term average
17.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 112 hours spilling →
F/E-River Avon, CSO-River Biss 11 112 down 65% 100%
Stour Row Pumping Station
Storm discharge at pumping station
Company site name
STOUR ROW
EA ID / permit
WXW01077 · 401115
Outlet location
ST8207020790 (OS grid reference) · View on Apple Maps
WFD catchment
Key Brook (GB108043016100)
2024 spills / hours
16 / 121
Long-term average
12.8 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 111 hours spilling →
Key Brook(S) 19 111 up 19% 100%
Bruton Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Bruton
Company site name
BRUTON GANTS MILL LANE STORM TANK
EA ID / permit
WXW00206 · 102409
Outlet location
ST6724133995 (OS grid reference) · View on Apple Maps
WFD catchment
Brue - Upper (GB108052021140)
2024 spills / hours
25 / 254
Long-term average
16.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 111 hours spilling →
River Brue 8 111 down 68% 100%
Station Road CSO
Overflow on sewer network
Company site name
WOOL STATION ROAD IN GRASS VERGE
EA ID / permit
WXW01059 · 401165
Outlet location
SY8440086990 (OS grid reference) · View on Apple Maps
WFD catchment
Frome Dorset (Lower) d/s Louds Mill Dorchester (GB108044009692)
2024 spills / hours
53 / 698
Long-term average
27.5 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 110 hours spilling →
Trib of River Frome 23 110 down 57% 100%
Wicklease Pumping Station
Storm discharge at pumping station
Company site name
BULKINGTON WICKLEAZE
EA ID / permit
WXW01255 · 011485
Outlet location
ST9436758258 (OS grid reference) · View on Apple Maps
WFD catchment
Semington Brook (Worton Str to Milebourne Str (GB109053022170)
2024 spills / hours
22 / 301
Long-term average
14.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 110 hours spilling →
Tributary of Semington Brook 8 110 down 64% 100%
Parade Gardens Storm Overflow
Overflow on sewer network
Company site name
BATH PARADE GARDENS
EA ID / permit
WXW00838 · 021513
Outlet location
ST7528264806 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
34 / 362
Long-term average
21.3 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 110 hours spilling →
River Avon 14 110 down 59% 100%
Westbury on Trym Storm Overflow
Overflow on sewer network
Company site name
BRISTOL HIGH STREET / HENBURY ROAD
EA ID / permit
WXW01231 · 101829
Outlet location
ST5721077510 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
49 / 165
Long-term average
43.7 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement ongoing
Volume & pollution
Estimate from 109 hours spilling →
River Avon (S) 36 109 down 27% 100%
Trafalgar Road CSO
Overflow on sewer network
Company site name
BATH WESTON VILLAGE SEWER
EA ID / permit
WXW01151 · 012182
Outlet location
ST7347065020 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
62 / 269
Long-term average
58.9 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 108 hours spilling →
River Avon via SWS 53 108 down 15% 92%
Adderwell Close CSO
Overflow on sewer network
Company site name
FROME ADDERWELL CLOSE
EA ID / permit
WXW00062 · 100444
Outlet location
ST7824747177 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Maiden Bradley to Mells) (GB109053022101)
2024 spills / hours
72 / 176
Long-term average
63.0 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 107 hours spilling →
River Frome (via SWS) 58 107 down 19% 100%
Cliff Street/Redcliffe Street CSO
Overflow on sewer network
Company site name
CHEDDAR UNION ST JNC WITH CLIFF ST AND REDCLIFFE ST
EA ID / permit
WXW00302 · 101662
Outlet location
ST4605453287 (OS grid reference) · View on Apple Maps
WFD catchment
Cheddar Yeo - source to conf Stubbingham Rhyne (GB109052021540)
2024 spills / hours
64 / 820
Long-term average
32.4 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 107 hours spilling →
Cheddar Yeo 20 107 down 69% 100%
Mitchels Pool Pumping Station
Storm discharge at pumping station
Company site name
WELLINGTON MITCHELLS POOL
EA ID / permit
WXW00746 · 100238
Outlet location
ST1454720895 (OS grid reference) · View on Apple Maps
WFD catchment
Haywards Water (GB108052015390)
2024 spills / hours
30 / 178
Long-term average
26.9 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 105 hours spilling →
Haywards Water 16 105 down 47% 100%
Kingston Seymour
Other storm discharge asset type
EA ID / permit
WXW01300 · Unpermitted
Outlet location
ST3840568661 (OS grid reference) · View on Apple Maps
WFD catchment
Severn Lower (GB530905415401)
Bathing water
Clevedon Beach
2024 spills / hours
51 / 355
Long-term average
34.8 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 104 hours spilling →
(E) Severn Estuary 21 104 down 59% 100%
Bath Lower Bristol Road West of Oak Street
Overflow on sewer network
EA ID / permit
WXW00648 · Unpermitted
Outlet location
ST7469064430 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
58 / 396
Long-term average
44.0 spills a year (monitored since 2022)
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 103 hours spilling →
River Avon 35 103 down 40% 100%
35 Hillside Road CSO
Overflow on sewer network
Company site name
PORTISHEAD HILLSIDE ROAD REDCLIFF BAY
EA ID / permit
WXW00026 · 100563/CS/01
Outlet location
ST4390375892 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
53 / 119
Long-term average
53.4 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 102 hours spilling →
River Severn (Estuarine) 45 102 down 15% 98%
Shepton Beauchamp Pumping Station
Storm discharge at pumping station
Company site name
SHEPTON BEAUCHAMP
EA ID / permit
WXW00982 · 102005
Outlet location
ST4074017120 (OS grid reference) · View on Apple Maps
WFD catchment
Lam Brook (GB108052015340)
2024 spills / hours
42 / 211
Long-term average
33.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 102 hours spilling →
Lambrook Brook(S) 23 102 down 45% 100%
Bleadney Mill Pumping Station
Storm discharge at pumping station
Company site name
BLEADNEY BLEADNEY MILL
EA ID / permit
WXW00147 · 102371
Outlet location
ST4860045430 (OS grid reference) · View on Apple Maps
WFD catchment
Axe - source to Cocklake (GB109052021520)
2024 spills / hours
32 / 290
Long-term average
17.0 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 102 hours spilling →
Lower River Axe(S) 11 102 down 66% 99%
Chilmark Pumping Station
Storm discharge at pumping station
Company site name
CHILMARK
EA ID / permit
WXW00273 · 041188
Outlet location
ST9708732049 (OS grid reference) · View on Apple Maps
WFD catchment
Nadder (Middle) (GB108043022470)
2024 spills / hours
27 / 443
Long-term average
17.0 spills a year (monitored since 2024)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 101 hours spilling →
Trib of the River Nadder 7 101 down 74% 100%
Terrace Wood CSO
Overflow on sewer network
Company site name
STON EASTON WELLOW BROOK IN FIELD NEAR BY
EA ID / permit
WXW01110 · 013134
Outlet location
ST6295053940 (OS grid reference) · View on Apple Maps
WFD catchment
Wellow Bk - source to conf Snails Bk (GB109053022250)
2024 spills / hours
67 / 180
Long-term average
59.8 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 100 hours spilling →
Wellow Brook 49 100 down 27% 97%
South Parade CSO
Overflow on sewer network
Company site name
BATH SOUTH PARADE IN GARDEN
EA ID / permit
WXW01013 · 102819
Outlet location
ST7539064613 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
41 / 351
Long-term average
21.5 spills a year (monitored since 2018)
Investigation
Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 100 hours spilling →
River Avon 20 100 down 51% 100%
Harbour Road CSO
Overflow on sewer network
Company site name
PORTISHEAD PORTBURY DITCH OFF HARBOUR RD
EA ID / permit
WXW00501 · 102658
Outlet location
ST4720076480 (OS grid reference) · View on Apple Maps
WFD catchment
Portbury Ditch - source to conf R Severn Estuary (GB109052027330)
2024 spills / hours
26 / 153
Long-term average
17.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 100 hours spilling →
Portbury Ditch(S) 19 100 down 27% 99%
Urchfont Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Urchfont
Company site name
URCHFONT STORM TANK
EA ID / permit
WXW01172 · 101668
Outlet location
SU0393557519 (OS grid reference) · View on Apple Maps
WFD catchment
Worton Str - source to conf Semington Bk (GB109053022210)
2024 spills / hours
49 / 543
Long-term average
15.4 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 99 hours spilling →
Semington Brook 13 99 down 73% 100%
Corston Pumping Station
Storm discharge at pumping station
Company site name
CORSTON NEWTON ST LOE
EA ID / permit
WXW00328 · 010300
Outlet location
ST6990765557 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
52 / 253
Long-term average
40.6 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 99 hours spilling →
Corston Brook 29 99 down 44% 100%
Bradford on Avon WwTW
Storm tank at sewage works
Sewage works
Bradford On Avon
Company site name
BRADFORD-ON-AVON STORM TANK
EA ID / permit
WXW00163 · 102190
Outlet location
ST8147060260 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (Semington Bk to By Bk) (GB109053027372)
2024 spills / hours
29 / 283
Long-term average
12.9 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 97 hours spilling →
River Avon 10 97 down 66% 100%
Green Park Syphon Inlet CSO
Overflow on sewer network
Company site name
BATH GREEN PARK SYPHON INLET RIVER TOWPATH
EA ID / permit
WXW00484 · 101191
Outlet location
ST7485964411 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
35 / 367
Long-term average
16.8 spills a year (monitored since 2019)
Monitor below 90%
Telemetry or data archiving failure / issue · Resolved - Mar
Investigation
Operational investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 97 hours spilling →
River Avon 11 97 down 69% 83%
South Bridge Comb. Storm Overflow
Storm discharge at pumping station
Company site name
BRIDPORT SOUTH BRIDGE TANK
EA ID / permit
WXW01010 · 400444
Outlet location
SY4660092240 (OS grid reference) · View on Apple Maps
WFD catchment
Asker (GB108044009580)
2024 spills / hours
49 / 247
Long-term average
34.6 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 97 hours spilling →
River Asker(S) 26 97 down 47% 100%
Hindon Wastewater Treatment Works
Inlet overflow at sewage works (with treatment)
Sewage works
Hindon
Company site name
HINDON INLET
EA ID / permit
WXW00545 · 402489
Outlet location
ST9165032750 (OS grid reference) · View on Apple Maps
WFD catchment
Fonthill Stream (GB108043022500)
2024 spills / hours
129 / 1,139
Long-term average
76.8 spills a year (monitored since 2020)
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 97 hours spilling →
Groundwater via Infilt System 74 97 down 43% 100%
Queen Street CSO
Overflow on sewer network
Company site name
GILLINGHAM QUEEN STREET
EA ID / permit
WXW00905 · 402123
Outlet location
ST8073326661 (OS grid reference) · View on Apple Maps
WFD catchment
Shreen Water (including Ashfield Water) (GB108043022450)
2024 spills / hours
26 / 115
Long-term average
15.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 97 hours spilling →
Shreen Water 17 97 down 35% 100%
The Garage PS
Storm discharge at pumping station
Company site name
WEST CHINNOCK GARAGE
EA ID / permit
WXW01118 · 103720
Outlet location
ST4692013840 (OS grid reference) · View on Apple Maps
WFD catchment
Chinnock BK (GB108052015310)
2024 spills / hours
19 / 101
Long-term average
19.8 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 96 hours spilling →
The Chinnock Brook(S) 20 96 up 5% 100%
Hawkwell Combined Sewer Overflow
Overflow on sewer network
Company site name
HAWKWELL SO
EA ID / permit
WXW00513 · 070230
Outlet location
SS9259539770 (OS grid reference) · View on Apple Maps
WFD catchment
Avill (GB108051020210)
2024 spills / hours
113 / 194
Long-term average
103.6 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 96 hours spilling →
River Avill 92 96 down 19% 100%
Pumping Station at King Arms
Storm discharge at pumping station
Company site name
STOBOROUGH KINGS ARMS
EA ID / permit
WXW00595 · 401198
Outlet location
SY9239086512 (OS grid reference) · View on Apple Maps
WFD catchment
Frome Dorset (Lower) d/s Louds Mill Dorchester (GB108044009692)
2024 spills / hours
31 / 196
Long-term average
15.9 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 96 hours spilling →
Tributary of the River Frome 22 96 down 29% 100%
Gurney Slade Pumping Station
Storm discharge at pumping station
Company site name
GURNEY SLADE
EA ID / permit
WXW00490 · 101865
Outlet location
ST6334049540 (OS grid reference) · View on Apple Maps
WFD catchment
Mells source to conf with Somerset Frome (GB109053022020)
2024 spills / hours
65 / 990
Long-term average
36.1 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 95 hours spilling →
Mells Stream(S) 19 95 down 71% 100%
The Green PS
Storm discharge at pumping station
Company site name
DAUNTSEY THE GREEN
EA ID / permit
WXW01120 · 102280
Outlet location
ST9955081930 (OS grid reference) · View on Apple Maps
WFD catchment
The Bourne - source to conf R Avon (Brist) (GB109053027710)
2024 spills / hours
34 / 205
Long-term average
24.8 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 95 hours spilling →
Dauntsey Brook(S) 25 95 down 26% 100%
Pumping Station at West Bay Sluices
Storm discharge at pumping station
Company site name
BRIDPORT WEST BAY SLUICES
EA ID / permit
WXW01217 · 402047
Outlet location
SY4622490483 (OS grid reference) · View on Apple Maps
WFD catchment
Lyme Bay East (GB620806560000)
Bathing water
West Bay (West)
2024 spills / hours
48 / 541
Long-term average
20.7 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 95 hours spilling →
Bridport Harbour (Coastal) 10 95 down 79% 100%
Leigh Bridge Farm Pumping Station
Storm discharge at pumping station
Company site name
LEIGH BRIDGE FARM
EA ID / permit
WXW00626 · 102978
Outlet location
ST6231808442 (OS grid reference) · View on Apple Maps
WFD catchment
Beer Hackett Stream (GB108052015580)
2024 spills / hours
10 / 70
Long-term average
15.0 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 94 hours spilling →
Trib of River Wriggle 16 94 up 60% 100%
Glenwood Road CSO
Overflow on sewer network
Company site name
BRISTOL GLENWOOD ROAD SIDE OF NO 2 WESTBURY ON TRYM
EA ID / permit
WXW00468 · 100460
Outlet location
ST5815577315 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
50 / 164
Long-term average
49.7 spills a year (monitored since 2020)
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 94 hours spilling →
Tributary of the River Trym 39 94 down 22% 100%
CSO O/S 29 High Street
Overflow on sewer network
Company site name
CHIPPENHAM - HIGH STREET O/S 6 - Combined Sewer Overflow
EA ID / permit
WXW00355 · 103293
Outlet location
ST9197073360 (OS grid reference) · View on Apple Maps
WFD catchment
Avon (Brist) conf R Marden to conf Semington Bk (GB109053027440)
2024 spills / hours
63 / 168
Long-term average
53.5 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 93 hours spilling →
River Avon(S) 47 93 down 25% 100%
Battle Lane CSO
Overflow on sewer network
Company site name
CHEW MAGNA BATTLE LANE
EA ID / permit
WXW00115 · EPRBB3193AR
Outlet location
ST5686263261 (OS grid reference) · View on Apple Maps
WFD catchment
Winford Bk - source to conf R Chew (GB109053021900)
2024 spills / hours
107 / 1,741
Long-term average
59.5 spills a year (monitored since 2020)
Investigation
UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 93 hours spilling →
Winford Brook 25 93 down 77% 100%
Curry Rivel Combined Sewer Overflow
Overflow on sewer network
Company site name
CURRY RIVEL CURRY RIVEL STORM O/F
EA ID / permit
WXW00358 · 082087
Outlet location
ST3971124606 (OS grid reference) · View on Apple Maps
WFD catchment
Parrett - R Yeo to West Sedgemoor Drain (GB108052015470)
2024 spills / hours
16 / 152
Long-term average
10.0 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 93 hours spilling →
Tributary of Drayton Drain 11 93 down 31% 100%
Brookhayes CSO
Overflow on sewer network
Company site name
COSSINGTON BROOKHAYES
EA ID / permit
WXW00202 · 101685
Outlet location
ST3586040710 (OS grid reference) · View on Apple Maps
WFD catchment
Huntspill (GB108052021210)
2024 spills / hours
53 / 149
Long-term average
45.3 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 92 hours spilling →
Cossington Brook(S) 39 92 down 26% 100%
Welton Hollow CSO
Overflow on sewer network
Company site name
MIDSOMER NORTON STORM RETENTION TANK (OLD STW)
EA ID / permit
WXW01212 · 100080
Outlet location
ST6779054830 (OS grid reference) · View on Apple Maps
WFD catchment
Wellow Bk - source to conf Snails Bk (GB109053022250)
2024 spills / hours
57 / 273
Long-term average
39.9 spills a year (monitored since 2018)
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 92 hours spilling →
Wellow Brook 28 92 down 51% 100%
Hayes Lane Pumping Station
Storm discharge at pumping station
Company site name
WIMBORNE HAYES LANE COLEHILL
EA ID / permit
WXW00514 · 401780
Outlet location
SZ0348599849 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Lower) (GB108043011040)
2024 spills / hours
28 / 112
Long-term average
16.3 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 91 hours spilling →
Trib of River Stour 26 91 down 7% 100%
West Milton Water Recycling Centre
Inlet overflow at sewage works
Sewage works
West Milton
Company site name
WEST MILTON INLET
EA ID / permit
WXW01224 · 041658
Outlet location
SY4989696271 (OS grid reference) · View on Apple Maps
WFD catchment
Mangerton Brook (GB108044009590)
2024 spills / hours
23 / 71
Long-term average
15.5 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 90 hours spilling →
Trib of Mangerton River 23 90 no change 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.