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
Stoneage Lane Pumping Station
Storm discharge at pumping station
Company site name
CARLINGCOTT STONEAGE LANE
EA ID / permit
WXW01073 · 013269
Outlet location
ST6962058500 (OS grid reference) · View on Apple Maps
WFD catchment
Cam Bk - source to conf Wellow Bk (GB109053022290)
2024 spills / hours
39 / 318
Long-term average
32.7 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 156 hours spilling →
Cam Brook (S) 28 156 down 28% 100%
Alford Water Recycling Centre
Inlet overflow at sewage works
Sewage works
Alford
Company site name
ALFORD INLET
EA ID / permit
WXW00070 · 101966
Outlet location
ST6047532364 (OS grid reference) · View on Apple Maps
WFD catchment
Brue - R. Alham to Tootle Bridge (GB108052021183)
2024 spills / hours
42 / 313
Long-term average
17.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 154 hours spilling →
Tributary of River Brue 17 154 down 60% 100%
Kilmersdon Pumping Station
Storm discharge at pumping station
Company site name
KILMERSDON
EA ID / permit
WXW00592 · 102698
Outlet location
ST6968152558 (OS grid reference) · View on Apple Maps
WFD catchment
Kilmersdon Str - source to conf Snails Bk (GB109053022230)
2024 spills / hours
54 / 254
Long-term average
44.5 spills a year (monitored since 2020)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 154 hours spilling →
Kilmersdon Stream 28 154 down 48% 100%
Frampton Farm Pumping Station
Storm discharge at pumping station
Company site name
LEIGH FRAMPTON FARM
EA ID / permit
WXW00446 · 102977
Outlet location
ST6133808503 (OS grid reference) · View on Apple Maps
WFD catchment
Wriggle River (GB108052015540)
2024 spills / hours
46 / 170
Long-term average
35.5 spills a year (monitored since 2020)
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 153 hours spilling →
Tributary of Wriggle River 31 153 down 33% 100%
Tetbury Waste Water Treatment Works
Inlet overflow at sewage works
Sewage works
Tetbury
Company site name
TETBURY INLET
EA ID / permit
WXW01111 · 102818
Outlet location
ST8942892804 (OS grid reference) · View on Apple Maps
WFD catchment
Tetbury Avon - source to conf unnamed trib (GB109053027800)
2024 spills / hours
49 / 180
Long-term average
79.9 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 153 hours spilling →
River Avon 49 153 no change 99%
Wellington Hill West CSO
Overflow on sewer network
Company site name
BRISTOL WELLINGTON HILL WEST NO 158
EA ID / permit
WXW01203 · 100466
Outlet location
ST5815577315 (OS grid reference) · View on Apple Maps
WFD catchment
Trym - source to conf R Avon (Brist) (GB109053027530)
2024 spills / hours
56 / 241
Long-term average
53.7 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 152 hours spilling →
Trib of River Trym via SWS 45 152 down 20% 100%
Hyde Lane Pumping Station
Storm discharge at pumping station
Company site name
BATHPOOL HYDE LANE
EA ID / permit
WXW00573 · 103186
Outlet location
ST2538025560 (OS grid reference) · View on Apple Maps
WFD catchment
Tone Ds Taunton (GB108052015482)
2024 spills / hours
46 / 364
Long-term average
34.2 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing, Operational improvement completed
Volume & pollution
Estimate from 151 hours spilling →
River Tone 19 151 down 59% 100%
Cannington Sewage Treatment Works
Inlet overflow at sewage works
Sewage works
Cannington
Company site name
CANNINGTON INLET
EA ID / permit
WXW00230 · 101442
Outlet location
ST2693039370 (OS grid reference) · View on Apple Maps
WFD catchment
Cannington Bk - Lower (GB108052021310)
2024 spills / hours
22 / 148
Long-term average
11.0 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 149 hours spilling →
Cannington Brook (S) 13 149 down 41% 100%
Chantry Gardens PS
Storm discharge at pumping station
Company site name
SOUTHWICK CHANTRY GARDENS
EA ID / permit
WXW00246 · 021630
Outlet location
ST8418755339 (OS grid reference) · View on Apple Maps
WFD catchment
Lambrok Str - source to conf R Biss (GB109053021800)
2024 spills / hours
36 / 241
Long-term average
16.8 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 149 hours spilling →
Lambrok Stream 18 149 down 50% 100%
Kington Langley Pumping Station
Storm discharge at pumping station
Company site name
KINGTON LANGLEY
EA ID / permit
WXW00601 · 101694
Outlet location
ST9155076860 (OS grid reference) · View on Apple Maps
WFD catchment
Sutton Benger Bk - source to conf R Avon (Brist) (GB109053027700)
2024 spills / hours
64 / 916
Long-term average
45.4 spills a year (monitored since 2019)
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 148 hours spilling →
Trib of River Avon(S) 13 148 down 80% 96%
Marnhull Reedbeds WRC
Storm tank at sewage works
Sewage works
Marnhull Reedbeds
Company site name
MARNHULL REED BEDS STORM TANK
EA ID / permit
WXW00689 · 401339
Outlet location
ST7933017540 (OS grid reference) · View on Apple Maps
WFD catchment
Stour (Middle u/s Pimperne Brook) (GB108043016051)
2024 spills / hours
16 / 119
Long-term average
11.3 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 147 hours spilling →
River Stour 14 147 down 13% 100%
Clyde Road CSO
Overflow on sewer network
Company site name
FRAMPTON COTTERELL CLYDE ROAD BRICKENHILL PERSONAGE BRIDGE (SE)
EA ID / permit
WXW00305 · 103071
Outlet location
ST6656981732 (OS grid reference) · View on Apple Maps
WFD catchment
Frome (Brist) - conf Laddon Bk to conf Folly Bk (GB109053027820)
2024 spills / hours
65 / 226
Long-term average
50.0 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 146 hours spilling →
River Frome 51 146 down 22% 100%
Mosses Mill Combined Sewer Overflow
Overflow on sewer network
Company site name
CALNE MOSSES MILL 2
EA ID / permit
WXW00758 · 100773
Outlet location
ST9877070738 (OS grid reference) · View on Apple Maps
WFD catchment
Marden - source to conf Cowage Bk (GB109053022050)
2024 spills / hours
64 / 398
Long-term average
54.0 spills a year (monitored since 2024)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 146 hours spilling →
River Marden 44 146 down 31% 100%
Mill Lane Combined Sewer Overflow
Overflow on sewer network
Company site name
BATHAMPTON MILL LANE
EA ID / permit
WXW00730 · 100511/CS/01
Outlet location
ST7740966882 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
41 / 316
Long-term average
33.7 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 145 hours spilling →
River Avon 23 145 down 44% 98%
Black Rocks CSO
Storm discharge at pumping station
Company site name
WESTON-SUPER-MARE BLACK ROCK WINDWHISTLE ROAD
EA ID / permit
WXW00141 · 101579
Outlet location
ST3058058690 (OS grid reference) · View on Apple Maps
WFD catchment
PARRETT (GB540805210900)
Bathing water
Weston-super-Mare Uphill Slipway; Weston Main
2024 spills / hours
24 / 207
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 145 hours spilling →
Axe Estuary(E) 16 145 down 33% 100%
Evershot Combined Sewer Overflow
Overflow on sewer network
Company site name
EVERSHOT COMMON
EA ID / permit
WXW00412 · 042430
Outlet location
ST5762704625 (OS grid reference) · View on Apple Maps
WFD catchment
Frome Dorset (Headwaters) (GB108044009620)
2024 spills / hours
81 / 272
Long-term average
76.0 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 ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 145 hours spilling →
River Frome 76 145 down 6% 100%
Weston Lock Retail Park
Overflow on sewer network
Company site name
BATH TECHNOLOGY HOUSE
EA ID / permit
WXW01239 · 102276
Outlet location
ST7293364761 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
38 / 440
Long-term average
20.8 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 145 hours spilling →
River Avon 18 145 down 53% 100%
Allens Brook CSO
Overflow on sewer network
Company site name
TAUNTON GOOSENFORD
EA ID / permit
WXW00073 · 102261
Outlet location
ST2495627755 (OS grid reference) · View on Apple Maps
WFD catchment
Allen Brook(Maiden brook) (GB108052015460)
2024 spills / hours
17 / 107
Long-term average
17.0 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 144 hours spilling →
Allen'S Brook 17 144 no change 97%
Blue Anchor Pumping Station
Storm discharge at pumping station
Company site name
BLUE ANCHOR PILL BRIDGE
EA ID / permit
WXW00151 · 102437
Outlet location
ST0273043490 (OS grid reference) · View on Apple Maps
WFD catchment
Pill (GB108051020390)
Bathing water
Blue Anchor West
2024 spills / hours
24 / 211
Long-term average
9.3 spills a year (monitored since 2017)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 144 hours spilling →
River Pill (F) 13 144 down 46% 100%
Airport Road CSO
Overflow on sewer network
Company site name
BRISTOL OPPOSITE 83 AIRPORT ROAD
EA ID / permit
WXW00065 · 103287
Outlet location
ST6059069890 (OS grid reference) · View on Apple Maps
WFD catchment
Brislington Bk - source to conf R Avon (Brist) (GB109053021980)
2024 spills / hours
50 / 314
Long-term average
42.2 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 144 hours spilling →
Brislington Brook(S) 31 144 down 38% 100%
Wickwar Water Recycling Centre
Storm tank at sewage works
Sewage works
Wickwar
Company site name
WICKWAR STORM TANK
EA ID / permit
WXW01256 · 010304
Outlet location
ST7278089501 (OS grid reference) · View on Apple Maps
WFD catchment
Little Avon R - source to conf Ozleworth Bk (GB109054026580)
2024 spills / hours
55 / 291
Long-term average
34.3 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 140 hours spilling →
Little Avon 29 140 down 47% 100%
Mill Lane Pumping Station
Storm discharge at pumping station
Company site name
COXLEY MILL LANE
EA ID / permit
WXW00737 · 102834
Outlet location
ST5302343805 (OS grid reference) · View on Apple Maps
WFD catchment
Sheppey (GB108052021221)
2024 spills / hours
64 / 349
Long-term average
49.8 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 139 hours spilling →
River Sheppey 32 139 down 50% 100%
Recreation Ground CSO
Overflow on sewer network
Company site name
BATH RECREATION GROUND BY NORTH STAND
EA ID / permit
WXW00924 · 102820
Outlet location
ST7528764882 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
87 / 426
Long-term average
69.9 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 139 hours spilling →
River Avon 58 139 down 33% 100%
Black Nore (Nautical School) PS
Storm discharge at pumping station
Company site name
PORTISHEAD BLACK NORE (NAUTICAL SCHOOL)
EA ID / permit
WXW00140 · 071587
Outlet location
ST4445276495 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
45 / 205
Long-term average
38.0 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
Operational improvement completed
Volume & pollution
Estimate from 139 hours spilling →
Severn Estuary 36 139 down 20% 100%
North Nibley Water Recycling Centre
Storm tank at sewage works
Sewage works
North Nibley
Company site name
NORTH NIBLEY STORM TANK
EA ID / permit
WXW00804 · 010063
Outlet location
ST7316196858 (OS grid reference) · View on Apple Maps
WFD catchment
Doverte Brook (GB109054026630)
2024 spills / hours
31 / 252
Long-term average
14.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 139 hours spilling →
Doverte Brook 16 139 down 48% 100%
Combe St Nicholas WwTW
Storm tank at sewage works
Sewage works
Combe St Nicholas
Company site name
COMBE ST NICHOLAS OFF PUDLEIGH LANE STORM TANK
EA ID / permit
WXW00314 · 103843
Outlet location
ST3196610868 (OS grid reference) · View on Apple Maps
WFD catchment
Isle - Upper (GB108052015160)
2024 spills / hours
20 / 198
Long-term average
8.8 spills a year (monitored since 2018)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 138 hours spilling →
River Isle 11 138 down 45% 100%
CSO at Newton Road
Overflow on sewer network
Company site name
STOFORD HILLSIDE MAIN
EA ID / permit
WXW01064 · 070149
Outlet location
ST5676014140 (OS grid reference) · View on Apple Maps
WFD catchment
Sutton Bingham Stream - conf Closworth Str to conf Yeo (GB108052015590)
2024 spills / hours
27 / 197
Long-term average
22.4 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 138 hours spilling →
Tributary of the River Yeo 21 138 down 22% 100%
Fiddington PS
Storm discharge at pumping station
Company site name
FIDDINGTON
EA ID / permit
WXW00423 · 102215
Outlet location
ST2173040660 (OS grid reference) · View on Apple Maps
WFD catchment
Fiddington Brook (GB108052021320)
2024 spills / hours
33 / 238
Long-term average
20.7 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 136 hours spilling →
Fiddington Book(S) 15 136 down 55% 100%
Lea North Pumping Station
Storm discharge at pumping station
Company site name
LEA NORTH
EA ID / permit
WXW00624 · 101677
Outlet location
ST9630086980 (OS grid reference) · View on Apple Maps
WFD catchment
Woodbridge Bk - source to conf Charlton Str (GB109053027760)
2024 spills / hours
48 / 545
Long-term average
52.0 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 135 hours spilling →
Woodbridge Brook (S) 18 135 down 63% 100%
Tunnel Pumping Station
Storm discharge at pumping station
Company site name
WATCHET MARKET STREET (TUNNEL)
EA ID / permit
WXW01160 · 101270
Outlet location
ST0700043470 (OS grid reference) · View on Apple Maps
WFD catchment
Not part of a river WB catchment
Bathing water
Blue Anchor West
2024 spills / hours
33 / 131
Long-term average
18.9 spills a year (monitored since 2017)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 134 hours spilling →
(S) Washford River 19 134 down 42% 100%
Longbridge Sewage Treatment Works
Inlet overflow at sewage works
Sewage works
Longbridge
Company site name
LONGBRIDGE FOSSE WAY INLET
EA ID / permit
WXW00643 · 101620
Outlet location
ST4181014010 (OS grid reference) · View on Apple Maps
WFD catchment
Lopen Brook (GB108052015330)
2024 spills / hours
6 / 24
Long-term average
67.5 spills a year (monitored since 2018)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 133 hours spilling →
Lopen Stream(S) 41 133 up 583% 100%
Keynsham High Level PS
Storm discharge at pumping station
Company site name
KEYNSHAM HIGH LEVEL PS AVON MILL LANE
EA ID / permit
WXW00589 · 102126
Outlet location
ST6570568585 (OS grid reference) · View on Apple Maps
WFD catchment
Chew - conf Winford Bk to conf R Avon (Brist) (GB109053021950)
2024 spills / hours
61 / 204
Long-term average
47.4 spills a year (monitored since 2018)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 133 hours spilling →
River Chew 43 133 down 30% 100%
Crewkerne East STW
Inlet overflow at sewage works
Sewage works
Crewkerne East
Company site name
CREWKERNE TRADING ESTATE CREWKERNE EAST INLET
EA ID / permit
WXW00343 · 101456
Outlet location
ST4508309655 (OS grid reference) · View on Apple Maps
WFD catchment
Parrett - headwaters to Broad River (GB108052015260)
2024 spills / hours
73 / 136
Long-term average
77.0 spills a year (monitored since 2023)
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 132 hours spilling →
Crewkerne Stream (S) 74 132 up 1% 100%
Street Main PS
Storm discharge at pumping station
Company site name
STREET MAIN
EA ID / permit
WXW01080 · 100740
Outlet location
ST4809837275 (OS grid reference) · View on Apple Maps
WFD catchment
South Drain (GB108052021181)
2024 spills / hours
48 / 273
Long-term average
35.6 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 132 hours spilling →
Trib of South Drain 26 132 down 46% 100%
Beckington WwTW
Storm tank at sewage works
Sewage works
Beckington
Company site name
BECKINGTON STORM TANK
EA ID / permit
WXW00120 · 011987
Outlet location
ST7962051970 (OS grid reference) · View on Apple Maps
WFD catchment
Somerset Frome conf with Mells to conf B. Avo (GB109053021840)
2024 spills / hours
55 / 854
Long-term average
31.3 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 132 hours spilling →
River Frome 11 132 down 80% 100%
West Town Road Pumping Station
Storm discharge at pumping station
Company site name
BRISTOL PORTWAY UNDER AVON BRIDGE
EA ID / permit
WXW01228 · 101997
Outlet location
ST5202277005 (OS grid reference) · View on Apple Maps
WFD catchment
BRISTOL AVON (GB530905415405)
2024 spills / hours
76 / 203
Long-term average
63.3 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 131 hours spilling →
River Avon 55 131 down 28% 100%
Donyatt Water Recycling Centre
Storm tank at sewage works
Sewage works
Donyatt
Company site name
DONYATT OFF A358 STORM TANK
EA ID / permit
WXW00372 · 102390
Outlet location
ST3404714243 (OS grid reference) · View on Apple Maps
WFD catchment
Isle - Upper to conf Cad Bk (GB108052015190)
2024 spills / hours
27 / 132
Long-term average
22.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Env Act (SODRP) improvement ongoing
Volume & pollution
Estimate from 130 hours spilling →
River Isle 20 130 down 26% 100%
Ostling Lane CSO
Overflow on sewer network
Company site name
BATHFORD OSTLING LANE
EA ID / permit
WXW00831 · 100504/CS/01
Outlet location
ST7857066960 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
68 / 252
Long-term average
60.1 spills a year (monitored since 2019)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed
Improvement
Operational improvement ongoing
Volume & pollution
Estimate from 130 hours spilling →
River Avon 48 130 down 29% 95%
Rossiter Road CSO
Overflow on sewer network
Company site name
BATH SPRING GARDENS ROAD U/S K&A CANAL SYPHON
EA ID / permit
WXW00940 · 010883
Outlet location
ST7538664312 (OS grid reference) · View on Apple Maps
WFD catchment
Bristol Avon (By Bk to Netham Weir) (GB109053027371)
2024 spills / hours
36 / 390
Long-term average
19.0 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 128 hours spilling →
River Avon 14 128 down 61% 100%
CSO at Scout Hut
Overflow on sewer network
Company site name
DORCHESTER LITTLE BRITTAIN ADJ SCOUT HUT
EA ID / permit
WXW00352 · 400690
Outlet location
SY7085090330 (OS grid reference) · View on Apple Maps
WFD catchment
Frome Dorset (Lower) d/s Louds Mill Dorchester (GB108044009692)
2024 spills / hours
25 / 322
Long-term average
20.0 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 128 hours spilling →
(S) Mill Stream 9 128 down 64% 99%
Swallett Gate Pumping Station
Storm discharge at pumping station
Company site name
CHRISTIAN MALFORD SWALLETTS GATE
EA ID / permit
WXW01093 · NPSWQD004959
Outlet location
ST9864480753 (OS grid reference) · View on Apple Maps
WFD catchment
The Bourne - source to conf R Avon (Brist) (GB109053027710)
2024 spills / hours
56 / 173
Long-term average
34.0 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing
Improvement
Operational improvement completed
Volume & pollution
Estimate from 127 hours spilling →
Tributary of the Bourne 35 127 down 38% 100%
Mill Road Pumping Station
Storm discharge at pumping station
Company site name
WORTON MILL ROAD
EA ID / permit
WXW00739 · 102479
Outlet location
ST9657057540 (OS grid reference) · View on Apple Maps
WFD catchment
Semington Brook (Worton Str to Milebourne Str (GB109053022170)
2024 spills / hours
23 / 243
Long-term average
17.2 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 126 hours spilling →
Semington Brook (S) 12 126 down 48% 100%
St Johns Street Pumping Station
Storm discharge at pumping station
Company site name
MALMESBURY ST JOHNS STREET
EA ID / permit
WXW01042 · 012855
Outlet location
ST9361287083 (OS grid reference) · View on Apple Maps
WFD catchment
Tetbury Avon - unnamed trib to conf Sherston Avon (GB109053027780)
2024 spills / hours
65 / 284
Long-term average
48.3 spills a year (monitored since 2020)
High-spill reason (company)
Not Applicable - Ongoing investigation
Investigation
No investigation activity in reporting period
Improvement
Operational improvement completed
Volume & pollution
Estimate from 126 hours spilling →
River Avon (Tetbury Branch) 35 126 down 46% 100%
Potterne Way Pumping Station
Storm discharge at pumping station
Company site name
VERWOOD POTTERNE WAY
EA ID / permit
WXW00881 · 401155
Outlet location
SU0985007550 (OS grid reference) · View on Apple Maps
WFD catchment
Crane (Dorset) (GB108043016090)
2024 spills / hours
64 / 390
Long-term average
49.3 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 126 hours spilling →
River Crane (S) 34 126 down 47% 100%
Cowleaze Lane Combined Sewer
Storm discharge at pumping station
Company site name
EDINGTON TINHEAD LOWER BAYNTON ROAD
EA ID / permit
WXW01137 · EPRJB3891NS
Outlet location
ST9341254016 (OS grid reference) · View on Apple Maps
WFD catchment
MIlebourne Str - source to conf Semington Bk (GB109053022150)
2024 spills / hours
48 / 381
Long-term average
39.0 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 123 hours spilling →
Trib of Semington Brook 15 123 down 69% 100%
Wanstrow PS
Storm discharge at pumping station
Company site name
WANSTROW
EA ID / permit
WXW01187 · 102697
Outlet location
ST7135041860 (OS grid reference) · View on Apple Maps
WFD catchment
Nunney Bk - source to conf Mells R (GB109053022000)
2024 spills / hours
27 / 141
Long-term average
20.5 spills a year (monitored since 2022)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 123 hours spilling →
Trib of the Nunney Brook(S) 16 123 down 41% 100%
Small Street PS
Storm discharge at pumping station
Company site name
CHIRTON SMALL STREET
EA ID / permit
WXW01002 · 401765
Outlet location
SU0756057260 (OS grid reference) · View on Apple Maps
WFD catchment
Hampshire Avon (West) (GB108043022370)
2024 spills / hours
31 / 357
Long-term average
8.0 spills a year (monitored since 2019)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 122 hours spilling →
Unnamed Watercourse(S) 10 122 down 68% 100%
Raf Hullavington PS
Storm discharge at pumping station
Company site name
HULLAVINGTON RAF STATION
EA ID / permit
WXW00914 · 101678
Outlet location
ST9071080390 (OS grid reference) · View on Apple Maps
WFD catchment
Rodbourne Bk - source to conf R Avon (Brist) (GB109053027720)
2024 spills / hours
16 / 191
Long-term average
9.2 spills a year (monitored since 2021)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Volume & pollution
Estimate from 122 hours spilling →
Trib River Avon (S) 13 122 down 19% 100%
Bilbrook Pumping Station
Storm discharge at pumping station
Company site name
BILBROOK
EA ID / permit
WXW00133 · 101656
Outlet location
ST0325041420 (OS grid reference) · View on Apple Maps
WFD catchment
Pill (GB108051020390)
Bathing water
Blue Anchor West
2024 spills / hours
34 / 227
Long-term average
25.6 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 121 hours spilling →
Pill River (S) 11 121 down 68% 99%
Clutton PS
Storm discharge at pumping station
Company site name
CLUTTON GREENBROOK
EA ID / permit
WXW00304 · 102915
Outlet location
ST6266958977 (OS grid reference) · View on Apple Maps
WFD catchment
Cam Bk - source to conf Wellow Bk (GB109053022290)
2024 spills / hours
32 / 163
Long-term average
32.5 spills a year (monitored since 2022)
Investigation
Operational investigation completed
Improvement
Operational improvement completed
Volume & pollution
Estimate from 120 hours spilling →
Trib of Cam Brook 28 120 down 13% 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.