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

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.

Overflow	Discharges to	Spills 2025	Hours 2025	Spills vs 2024	Monitor uptime
Hurdcott Wastewater Treatment Works Storm tank at sewage works Sewage works Hurdcott Company site name HURDCOTT STORM TANK EA ID / permit WXW00571 · 040044 Outlet location SU1684033590 (OS grid reference) · View on Apple Maps WFD catchment Bourne (Hampshire Avon) (GB108043022390) 2024 spills / hours 310 / 6,467 Long-term average 196.5 spills a year (monitored since 2018) 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 3,119 hours spilling →	River Bourne	167	3,119	down 46%	100%
Shrewton Water Recycling Centre Storm tank at sewage works (with treatment) Sewage works Shrewton Company site name SHREWTON STORM TANK EA ID / permit WXW00993 · 040080 Outlet location SU0743742649 (OS grid reference) · View on Apple Maps WFD catchment Till (Hampshire Avon) (GB108043022570) Treatment Nature Based Solutions trial 2024 spills / hours 235 / 4,870 Long-term average 189.0 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 2,679 hours spilling →	River Till	116	2,679	down 51%	100%
Chew Stoke WwTW Storm tank at sewage works Sewage works Chew Stoke Company site name CHEW STOKE WALLEY COURT ROAD STORM TANK EA ID / permit WXW00265 · 102937 Outlet location ST5704762083 (OS grid reference) · View on Apple Maps WFD catchment Chew - Chew Valley Lake to conf Winford Brook (GB109053021852) 2024 spills / hours 258 / 4,642 Long-term average 171.2 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 2,529 hours spilling →	River Chew	139	2,529	down 46%	100%
Podimore - Behind Greystones - Sewage Treatment Works Inlet overflow at sewage works Sewage works Podimore Behind Greystones EA ID / permit WXW01342 · Unpermitted Outlet location ST5443124710 (OS grid reference) · View on Apple Maps WFD catchment Cary - source to conf with KSD (GB108052015140) 2024 spills / hours – / – 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 2,198 hours spilling →	Unnamed tributary of the River Cary	124	2,198		100%
Sydling St.Nicholas WRC Storm tank at sewage works Sewage works Sydling St Nicholas Company site name SYDLING ST NICHOLAS NEAR HUISH FARM STORM TANK EA ID / permit WXW01100 · 401025 Outlet location SY6320198437 (OS grid reference) · View on Apple Maps WFD catchment Sydling Water (GB108044009700) 2024 spills / hours 159 / 3,522 Long-term average 109.4 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 2,149 hours spilling →	Sydling Water	97	2,149	down 39%	100%
Martinstown PS Storm discharge at pumping station Company site name MARTINSTOWN B3159 EA ID / permit WXW00695 · 401520 Outlet location SY6536088740 (OS grid reference) · View on Apple Maps WFD catchment South Winterbourne (GB108044010060) 2024 spills / hours 223 / 2,641 Long-term average 135.2 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 2,030 hours spilling →	The South Winterbourne(S)	129	2,030	down 42%	100%
Allington Old Inn PS Storm discharge at pumping station Company site name ALLINGTON OLD INN EA ID / permit WXW00075 · 401580 Outlet location SU2053339325 (OS grid reference) · View on Apple Maps WFD catchment Bourne (Hampshire Avon) (GB108043022390) 2024 spills / hours 126 / 2,649 Long-term average 60.7 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,978 hours spilling →	River Bourne	85	1,978	down 33%	100%
Chicksbridge PS Storm discharge at pumping station Company site name LITTON CHENEY CHICKSBRIDGE EA ID / permit WXW00268 · 401592 Outlet location SY5407089720 (OS grid reference) · View on Apple Maps WFD catchment Bride (GB108044009550) 2024 spills / hours 188 / 3,793 Long-term average 142.7 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 Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 1,957 hours spilling →	River Bride(S)	112	1,957	down 40%	100%
Great Badminton WwTW Storm tank at sewage works Sewage works Great Badminton Company site name GREAT BADMINTON STORM TANK EA ID / permit WXW00478 · 010039 Outlet location ST8169783054 (OS grid reference) · View on Apple Maps WFD catchment Luckington Bk (GB109053027665) 2024 spills / hours 189 / 4,012 Long-term average 147.5 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 1,904 hours spilling →	Luckington Brook	94	1,904	down 50%	100%
Iwerne Minster WRC Storm tank at sewage works Sewage works Iwerne Minster Company site name IWERNE MINSTER STORM TANK EA ID / permit WXW00582 · 401089 Outlet location ST8622414055 (OS grid reference) · View on Apple Maps WFD catchment Iwerne (GB108043016010) 2024 spills / hours 167 / 3,648 Long-term average 96.8 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 Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 1,816 hours spilling →	River Iwerne	83	1,816	down 50%	100%
Pumping Stn Adjacent the Piddle Inn Overflow on sewer network Company site name PIDDLETRENTHIDE R/O TRENT HOUSE (CSO6) EA ID / permit WXW00897 · EPRAP3822XS Outlet location SY7048099756 (OS grid reference) · View on Apple Maps WFD catchment Piddle (Upper) (GB108044010120) 2024 spills / hours 137 / 3,091 Long-term average 80.2 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 1,753 hours spilling →	The River Piddle	78	1,753	down 43%	100%
Pumping Station Adjacent Rivendell Overflow on sewer network Company site name PIDDLETRENTHIDE ACROSS RIVER FROM RIVENDELL (CSO4) EA ID / permit WXW00895 · EPRAP3827XC Outlet location ST7027900119 (OS grid reference) · View on Apple Maps WFD catchment Piddle (Upper) (GB108044010120) 2024 spills / hours 118 / 2,477 Long-term average 97.0 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 1,692 hours spilling →	The River Piddle	76	1,692	down 36%	100%
Buckland Newton WRC Inlet overflow at sewage works Sewage works Buckland Newton Company site name BUCKLAND NEWTON DUNTISH INLET EA ID / permit WXW00208 · 043204 Outlet location ST7008406363 (OS grid reference) · View on Apple Maps WFD catchment Lydden (Upper) (GB108043015890) 2024 spills / hours 160 / 2,582 Long-term average 123.3 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 1,684 hours spilling →	River Lydden	108	1,684	down 33%	100%
Hazelbury Bryan WRC Storm tank at sewage works Sewage works Hazelbury Bryan Company site name HAZELBURY BRYAN STORM TANK EA ID / permit WXW00516 · 040037 Outlet location ST7456209339 (OS grid reference) · View on Apple Maps WFD catchment Lydden (Middle) (GB108043015940) 2024 spills / hours 130 / 2,524 Long-term average 93.8 spills a year (monitored since 2022) 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 1,569 hours spilling →	Tributary of the River Lydden	79	1,569	down 39%	100%
Barford St Martin WRC Storm tank at sewage works Sewage works Barford St Martin Company site name BARFORD ST MARTIN BURCOMBE STORM TANK EA ID / permit WXW00104 · 041560 Outlet location SU0604231168 (OS grid reference) · View on Apple Maps WFD catchment Nadder (Middle) (GB108043022470) 2024 spills / hours 185 / 3,574 Long-term average 97.5 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 1,551 hours spilling →	River Nadder	81	1,551	down 56%	100%
Wookey Water Recycling Centre Storm tank at sewage works Sewage works Wookey Company site name WOOKEY STORM TANK EA ID / permit WXW01282 · 070130 Outlet location ST5076645589 (OS grid reference) · View on Apple Maps WFD catchment Axe - source to Cocklake (GB109052021520) 2024 spills / hours 148 / 3,025 Long-term average 116.5 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,540 hours spilling →	River Axe	92	1,540	down 38%	100%
The Ponds PS Storm discharge at pumping station Company site name COMPTON BASSETT THE POND EA ID / permit WXW01125 · 103449 Outlet location SU0331072880 (OS grid reference) · View on Apple Maps WFD catchment Abberd Bk - source to conf R Marden (GB109053027600) 2024 spills / hours 154 / 3,160 Long-term average 100.8 spills a year (monitored since 2019) 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 1,501 hours spilling →	Tributary of Abberd Brook	70	1,501	down 55%	99%
Tetbury Waste Water Treatment Works Storm tank at sewage works Sewage works Tetbury Company site name TETBURY STORM TANK EA ID / permit WXW01112 · 102818 Outlet location ST8954892447 (OS grid reference) · View on Apple Maps WFD catchment Tetbury Avon - source to conf unnamed trib (GB109053027800) 2024 spills / hours 137 / 2,519 Long-term average 88.7 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 1,495 hours spilling →	River Avon	78	1,495	down 43%	99%
Halstock Water Recycling Centre Storm tank at sewage works Sewage works Halstock Company site name HALSTOCK WATERY LANE STORM TANK EA ID / permit WXW00494 · 071221 Outlet location ST5429408165 (OS grid reference) · View on Apple Maps WFD catchment Sutton Bingham Stream - East Arm (GB108052015520) 2024 spills / hours 171 / 3,120 Long-term average 124.7 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 1,424 hours spilling →	Tributary of the River Yeo	82	1,424	down 52%	100%
Pibsbury Pumping Station Storm discharge at pumping station Company site name HUISH EPISCOPI PIBSBURY EA ID / permit WXW00857 · 071157 Outlet location ST4385626307 (OS grid reference) · View on Apple Maps WFD catchment King's Sedgemoor Drain - Henley Sluice to mouth (GB108052021150) 2024 spills / hours 62 / 1,377 Long-term average 56.7 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 1,393 hours spilling →	Long Sutton Catchwater	62	1,393	no change	100%
Nunney Water Recycling Centre Storm tank at sewage works Sewage works Nunney Company site name NUNNEY STORM TANK EA ID / permit WXW00816 · 103453 Outlet location ST7363046462 (OS grid reference) · View on Apple Maps WFD catchment Nunney Bk - source to conf Mells R (GB109053022000) 2024 spills / hours 81 / 1,245 Long-term average 72.0 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 1,383 hours spilling →	Nunney Brook	77	1,383	down 5%	100%
Marnhull Wastewater Treatment Works Storm tank at sewage works Sewage works Marnhull Company site name MARNHULL COMMON STORM TANK EA ID / permit WXW00690 · 040628 Outlet location ST7645017860 (OS grid reference) · View on Apple Maps WFD catchment Stour (Upper) (GB108043016170) 2024 spills / hours 134 / 2,464 Long-term average 103.3 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,365 hours spilling →	River Stour	75	1,365	down 44%	100%
Haselbury Plucknett WRC Storm tank at sewage works Sewage works Haselbury Plucknett Company site name HASELBURY PLUCKNETT NEW LANE STORM TANK EA ID / permit WXW00509 · 102389 Outlet location ST4731011275 (OS grid reference) · View on Apple Maps WFD catchment Broad (GB108052015270) 2024 spills / hours 107 / 1,739 Long-term average 84.7 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 1,315 hours spilling →	Small Brook	83	1,315	down 22%	100%
Montacute CSO Overflow on sewer network Company site name MONTACUTE NR OLD STW EA ID / permit WXW00750 · 102265 Outlet location ST4946017760 (OS grid reference) · View on Apple Maps WFD catchment Wellhams Brook (GB108052015350) 2024 spills / hours 150 / 2,361 Long-term average 95.7 spills a year (monitored since 2019) High-spill reason (company) Not Applicable - Ongoing investigation Monitor below 90% Telemetry or data archiving failure / issue · Resolved - Jul Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Operational improvement completed Volume & pollution Estimate from 1,314 hours spilling →	Tributary of Wellahms Brook	82	1,314	down 45%	80%
Hullavington WwTW Storm tank at sewage works Sewage works Hullavington Company site name HULLAVINGTON STORM TANK EA ID / permit WXW00568 · 101441 Outlet location ST8962382856 (OS grid reference) · View on Apple Maps WFD catchment Gauze Bk - source to conf R Avon (Brist) (GB109053027730) 2024 spills / hours 136 / 2,523 Long-term average 114.3 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 completed Volume & pollution Estimate from 1,286 hours spilling →	Gauze Brook (S)	79	1,286	down 42%	100%
East Harptree WRC Storm tank at sewage works Sewage works East Harptree Company site name EAST HARPTREE STORM TANK EA ID / permit WXW00393 · 011348 Outlet location ST5737256390 (OS grid reference) · View on Apple Maps WFD catchment Chew - source to Chew Valley Lake (GB109053021851) 2024 spills / hours 141 / 2,250 Long-term average 125.3 spills a year (monitored since 2019) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Operational improvement completed Volume & pollution Estimate from 1,283 hours spilling →	Trib of River Chew	99	1,283	down 30%	100%
Fovant Water Recycling Centre Storm tank at sewage works Sewage works Fovant Company site name FOVANT STORM TANK EA ID / permit WXW00443 · 401338 Outlet location ST9983330171 (OS grid reference) · View on Apple Maps WFD catchment Fovant Brook (GB108043016190) 2024 spills / hours 193 / 2,533 Long-term average 107.7 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 1,252 hours spilling →	Fovant Brook	81	1,252	down 58%	100%
Draycott and Rodneystoke STW Storm tank at sewage works Sewage works Draycott And Rodneystoke Company site name DRAYCOTT MILKING LANE STORM TANK EA ID / permit WXW00381 · 070038 Outlet location ST4721750393 (OS grid reference) · View on Apple Maps WFD catchment Axe - Cocklake to Brean Cross Sluice (GB109052021570) 2024 spills / hours 123 / 2,108 Long-term average 97.0 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 1,205 hours spilling →	Dolmead Rhyne(S)	71	1,205	down 42%	100%
Wick St Lawrence STW Storm tank at sewage works Sewage works Wick St Lawrence Company site name WICK ST LAWRENCE STORM TANK EA ID / permit WXW01252 · 102350 Outlet location ST3651066600 (OS grid reference) · View on Apple Maps WFD catchment PARRETT (GB540805210900) 2024 spills / hours 100 / 1,892 Long-term average 81.8 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 1,173 hours spilling →	Congresbury Yeo(E)	61	1,173	down 39%	100%
Doynton Wastewater Treatment Works Inlet overflow at sewage works Sewage works Doynton Company site name DOYNTON INLET EA ID / permit WXW00380 · 102816 Outlet location ST7141373915 (OS grid reference) · View on Apple Maps WFD catchment Boyd - source to conf R Avon (Brist) (GB109053027510) 2024 spills / hours 126 / 2,484 Long-term average 85.3 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 completed Volume & pollution Estimate from 1,166 hours spilling →	River Boyd (S)	58	1,166	down 54%	100%
Somerton STW Storm tank at sewage works Sewage works Somerton Company site name SOMERTON BARPOOL LANE STORM TANK EA ID / permit WXW01007 · 103392 Outlet location ST4847029870 (OS grid reference) · View on Apple Maps WFD catchment Cary - source to conf with KSD (GB108052015140) 2024 spills / hours 113 / 2,195 Long-term average 67.2 spills a year (monitored since 2021) 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 1,146 hours spilling →	Trib of River Cary()	56	1,146	down 50%	100%
Tockington STW Storm tank at sewage works Sewage works Tockington Company site name TOCKINGTON MOOR LANE STORM TANK EA ID / permit WXW01142 · 101834 Outlet location ST6006085880 (OS grid reference) · View on Apple Maps WFD catchment Chestle Pill (GB109054026650) 2024 spills / hours 105 / 2,156 Long-term average 80.5 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 1,136 hours spilling →	Tockington Mill Rhine(S)	56	1,136	down 47%	100%
Spaniel'S Bridge Pumping Station Storm discharge at pumping station Company site name COATE SPANIELS BRIDGE EA ID / permit WXW01024 · NPSWQD008925 Outlet location SU0420162218 (OS grid reference) · View on Apple Maps WFD catchment Etchilhampton Water (GB108043022430) 2024 spills / hours 192 / 4,372 Long-term average 122.9 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 Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 1,078 hours spilling →	Tributary of River Avon	52	1,078	down 73%	100%
Didmarton Water Recycling Centre Storm tank at sewage works Sewage works Didmarton Company site name DIDMARTON STORM TANK EA ID / permit WXW00365 · 010031 Outlet location ST8272487394 (OS grid reference) · View on Apple Maps WFD catchment Sherston Avon (GB109053027690) 2024 spills / hours 84 / 1,769 Long-term average 64.5 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 1,073 hours spilling →	River Avon (Sherston Branch)	54	1,073	down 36%	96%
Broads Green PS Storm discharge at pumping station Company site name BROADS GREEN EA ID / permit WXW00195 · 101985 Outlet location ST9877067510 (OS grid reference) · View on Apple Maps WFD catchment Willow Brook (Bristol Avon and North Somerset) (GB109053022040) 2024 spills / hours 116 / 2,460 Long-term average 89.5 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 completed Volume & pollution Estimate from 1,058 hours spilling →	Trib of River Marden(S)	54	1,058	down 53%	100%
Butleigh Sewage Treatment Works Storm tank at sewage works Sewage works Butleigh Company site name BUTLEIGH STORM TANK EA ID / permit WXW00218 · 071978 Outlet location ST5329034570 (OS grid reference) · View on Apple Maps WFD catchment Brue - Tootle Bridge to Clyse Hole (GB108052021182) 2024 spills / hours 132 / 2,305 Long-term average 116.8 spills a year (monitored since 2021) 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 1,048 hours spilling →	River Brue (S)	65	1,048	down 51%	100%
Fivehead Wastewater Treatment Works Storm tank at sewage works Sewage works Fivehead Company site name FIVEHEAD STORM TANK EA ID / permit WXW00432 · 071853 Outlet location ST3642121819 (OS grid reference) · View on Apple Maps WFD catchment Isle - Cad Bk to Fivehead River (GB108052015220) 2024 spills / hours 117 / 2,432 Long-term average 64.4 spills a year (monitored since 2019) 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 1,013 hours spilling →	River Isle	51	1,013	down 56%	100%
Mappowder STW Inlet overflow at sewage works Sewage works Mappowder Company site name MAPPOWDER INLET EA ID / permit WXW01301 · 040055 Outlet location ST7381806650 (OS grid reference) · View on Apple Maps WFD catchment Wonston Brook (GB108043015900) 2024 spills / hours 103 / 2,088 Long-term average 88.3 spills a year (monitored since 2022) 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 1,002 hours spilling →	Trib of the River Lydden	62	1,002	down 40%	98%
Rookery Farm PS Storm discharge at pumping station Company site name CHARLTON MACKERELL ROOKERY FARM EA ID / permit WXW00939 · 102064 Outlet location ST5243328124 (OS grid reference) · View on Apple Maps WFD catchment Cary - source to conf with KSD (GB108052015140) 2024 spills / hours 108 / 1,851 Long-term average 74.0 spills a year (monitored since 2022) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,002 hours spilling →	Bull Brook	49	1,002	down 55%	100%
Broadmead Lane Pump Station Storm discharge at pumping station Company site name EDINGTON BROADMEAD LANE (SOM) EA ID / permit WXW00193 · NPSWQD006726 Outlet location ST3860740138 (OS grid reference) · View on Apple Maps WFD catchment South Drain (GB108052021181) 2024 spills / hours 99 / 1,934 Long-term average 68.4 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 Operational improvement completed Volume & pollution Estimate from 991 hours spilling →	Trib of Nidon Rhyne	49	991	down 51%	100%
Bennetts Orchard Pumping Station Storm discharge at pumping station Company site name LONG SUTTON BENNETTS ORCHARD EA ID / permit WXW00128 · 102399 Outlet location ST4666725386 (OS grid reference) · View on Apple Maps WFD catchment King's Sedgemoor Drain - Henley Sluice to mouth (GB108052021150) 2024 spills / hours 104 / 1,934 Long-term average 64.2 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 Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 989 hours spilling →	Crouds Lake	54	989	down 48%	100%
Broadway WwTW Storm tank at sewage works Sewage works Broadway Company site name BROADWAY OFF A358 STORM TANK EA ID / permit WXW00198 · 071233 Outlet location ST3323915573 (OS grid reference) · View on Apple Maps WFD catchment Ding (GB108052015180) 2024 spills / hours 81 / 1,177 Long-term average 82.6 spills a year (monitored since 2019) 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 974 hours spilling →	River Ding	64	974	down 21%	100%
Sutton Benger WwTW Inlet overflow at sewage works Sewage works Sutton Benger Company site name SUTTON BENGER INLET EA ID / permit WXW01090 · 010083 Outlet location ST9579078610 (OS grid reference) · View on Apple Maps WFD catchment Avon (Brist) conf Tetbury Avon to conf R Marden (GB109053027650) 2024 spills / hours 134 / 2,351 Long-term average 96.0 spills a year (monitored since 2023) 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 972 hours spilling →	Bristol Avon(S)	62	972	down 54%	100%
Pumping Station at No 6 New Road Storm discharge at pumping station Company site name RANGEWORTHY BERROWS MEAD EA ID / permit WXW00918 · 103233 Outlet location ST6947886191 (OS grid reference) · View on Apple Maps WFD catchment Laddon Bk - source to conf R Frome (Brist) (GB109053027590) 2024 spills / hours 91 / 1,767 Long-term average 82.3 spills a year (monitored since 2023) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 963 hours spilling →	Tributary of Ladden Brook	52	963	down 43%	100%
Ubley Water Recycling Centre Storm tank at sewage works (with treatment) Sewage works Ubley Company site name UBLEY FROG LANE STORM TANK EA ID / permit WXW01163 · 101480 Outlet location ST5241158514 (OS grid reference) · View on Apple Maps WFD catchment Yeo - source to conf Congresbury Yeo (GB109052021640) Treatment Nature Based Solutions trial 2024 spills / hours 108 / 2,128 Long-term average 86.8 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 Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 946 hours spilling →	Congresbury Yeo, Trib of Lake	50	946	down 54%	100%
Charlton Musgrove STW Inlet overflow at sewage works Sewage works Charlton Musgrove Company site name CHARLTON MUSGROVE BARROW LANE EA ID / permit WXW00253 · 401757 Outlet location ST7319031600 (OS grid reference) · View on Apple Maps WFD catchment Cale (GB108043015850) 2024 spills / hours 105 / 1,661 Long-term average 82.0 spills a year (monitored since 2024) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 939 hours spilling →	Trib of River Cale(S)	59	939	down 44%	100%
Bath (Saltford) WRC Storm tank at sewage works Sewage works Bath Company site name SALTFORD MEAD LANE STORM TANK EA ID / permit WXW00108 · 102272 Outlet location ST6950068550 (OS grid reference) · View on Apple Maps WFD catchment Bristol Avon (By Bk to Netham Weir) (GB109053027371) 2024 spills / hours 98 / 1,550 Long-term average 66.8 spills a year (monitored since 2017) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 925 hours spilling →	River Avon	46	925	down 53%	100%
Bye Farm Combined Sewer Overflow Overflow on sewer network Company site name OLD CLEEVE BYE FARM NEW SO EA ID / permit WXW00219 · 102030 Outlet location ST0512041660 (OS grid reference) · View on Apple Maps WFD catchment Washford - Lower (GB108051020560) Bathing water Blue Anchor West 2024 spills / hours 100 / 1,292 Long-term average 73.8 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 Operational improvement completed Volume & pollution Estimate from 903 hours spilling →	Washford River (S)	71	903	down 29%	100%
Kingsdon Pumping Station Storm discharge at pumping station Company site name KINGSDON EA ID / permit WXW00599 · 101845 Outlet location ST5243826119 (OS grid reference) · View on Apple Maps WFD catchment Cary - source to conf with KSD (GB108052015140) 2024 spills / hours 84 / 1,561 Long-term average 61.8 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 894 hours spilling →	Trib of Park Brook	45	894	down 46%	100%
Pilton Water Recycling Centre Storm tank at sewage works Sewage works Pilton Company site name PILTON STORM TANK EA ID / permit WXW00859 · 070087 Outlet location ST5844740507 (OS grid reference) · View on Apple Maps WFD catchment Whitelake (GB108052021173) 2024 spills / hours 62 / 1,171 Long-term average 44.3 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 885 hours spilling →	Tributary of Whitelake	45	885	down 27%	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.