Storm overflow register · 2025 annual return

South West Water storm overflows, 2025

South West Water reported 1,365 storm overflows in England for 2025. Together they recorded 46,164 spills over 407,006 hours, an average of 33.8 spills per overflow against 20.4 across England. That ranks 10 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 18% on 2024.

178 overflows did not spill · 275 spilled more than 60 times · 1,313 had monitors working for 90% of the year or more · 334 sewage treatment works with overflows

Hours spilling by month, 2025

Hours spilling, all South West Water overflows, from the start/stop records. Spills running across a month end are split between the months.

All South West 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
Fraddon Wastewater Treatement Works Inlet overflow at sewage works Sewage works Fraddon Wastewater Treatement Works Company site name FRADDON STW_SO_FRADDON EA ID / permit SBB00477 · NRA-SW-5666 Outlet location SW90425773 (OS grid reference) · View on Apple Maps WFD catchment Gannel (Upper) (GB108049000230) 2024 spills / hours 123 / 820 Long-term average 108.3 spills a year (monitored since 2019) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,221 hours spilling →	Trib of River Gannel	67	1,221	down 46%	100%
Westexe Pumping Station Storm discharge at pumping station Company site name WESTEXE SPST_PSCSOEO_TIVERTON EA ID / permit SBB01350 · 203079 Outlet location SS95321201 (OS grid reference) · View on Apple Maps WFD catchment Exe (Barle to Culm) (GB108045015050) 2024 spills / hours 148 / 2,722 Long-term average 125.0 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, UWWTR improvement ongoing Volume & pollution Estimate from 1,204 hours spilling →	River Exe	81	1,204	down 45%	100%
Bratton Fleming STW Inlet overflow at sewage works Sewage works Bratton Fleming Company site name BRATTON FLEMING STW_SO_BRATTON FLEMING EA ID / permit SBB00147 · DRA 1538 Outlet location SS63603670 (OS grid reference) · View on Apple Maps WFD catchment Chelfham Stream (GB108050019920) 2024 spills / hours 90 / 1,822 Long-term average 82.8 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,192 hours spilling →	(S) River Yeo (Barnstaple)	61	1,192	down 32%	100%
Ernesettle Sewage Treatment Works Inlet overflow at sewage works Sewage works Ernesettle Company site name ERNESETTLE STW_SO_PLYMOUTH EA ID / permit SBB00419 · 301142 Outlet location SX44246023 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 85 / 712 Long-term average 73.2 spills a year (monitored since 2016) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,185 hours spilling →	River Tamar (E)	114	1,185	up 34%	95%
Egloskerry STW Inlet overflow at sewage works Sewage works Egloskerry Company site name EGLOSKERRY STW_SO_EGLOSKERRY EA ID / permit SBB00409 · 302124 Outlet location SX27068635 (OS grid reference) · View on Apple Maps WFD catchment Kensey (GB108047007960) 2024 spills / hours 141 / 1,665 Long-term average 138.8 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,174 hours spilling →	River Kensey (S)	116	1,174	down 18%	98%
Muddiford Pumping Station Storm discharge at pumping station Company site name MUDDIFORD SPS_PSCSOEO_MUDDIFORD EA ID / permit SBB00817 · 201617 Outlet location SS56333820 (OS grid reference) · View on Apple Maps WFD catchment Bradiford Water (GB108050020040) 2024 spills / hours 87 / 1,774 Long-term average 68.0 spills a year (monitored since 2019) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,160 hours spilling →	Colam Stream	68	1,160	down 22%	99%
Moretonhampstead WwTW Inlet overflow at sewage works Sewage works Moretonhampstead Company site name MORETONHAMPSTEAD STW_SO_MORETONHAMPSTEAD EA ID / permit SBB00806 · NRA-SW-3912 Outlet location SX76728503 (OS grid reference) · View on Apple Maps WFD catchment Wray Brook (GB108046008330) 2024 spills / hours 185 / 3,978 Long-term average 106.6 spills a year (monitored since 2017) High-spill reason (company) Not asset maintenance - hydraulic capacity 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 1,156 hours spilling →	The Wray Brook	70	1,156	down 62%	79%
Princetown Sewage Treatment Works Inlet overflow at sewage works Sewage works Princetown Company site name PRINCETOWN STW_SO_PRINCETOWN EA ID / permit SBB00985 · 201064 Outlet location SX59717414 (OS grid reference) · View on Apple Maps WFD catchment Blackbrook River (GB108046008370) 2024 spills / hours 149 / 1,824 Long-term average 125.8 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,150 hours spilling →	Blackbrook River(S)	101	1,150	down 32%	100%
Camels Head WwTW Storm tank at sewage works Sewage works Camels Head Company site name CAMELS HEAD STW_SSO_PLYMOUTH EA ID / permit SBB00207 · 303000 Outlet location SX44665714 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 84 / 1,296 Long-term average 73.4 spills a year (monitored since 2016) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,139 hours spilling →	Weston Mill Lake(E)	63	1,139	down 25%	100%
Princetown Sewage Treatment Works Storm tank at sewage works Sewage works Princetown Company site name PRINCETOWN STW_SSO_PRINCETOWN EA ID / permit SBB00986 · 201064 Outlet location SX59717414 (OS grid reference) · View on Apple Maps WFD catchment Blackbrook River (GB108046008370) 2024 spills / hours 102 / 1,421 Long-term average 44.3 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,135 hours spilling →	Blackbrook River(S)	75	1,135	down 26%	95%
Forder Valley Road CSO Overflow on sewer network Company site name FORDER VALLEY ROAD_CSO_PLYMOUTH EA ID / permit SBB00471 · 301676 Outlet location SX51065733 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment Bathing water Plymouth Hoe East 2024 spills / hours 102 / 1,432 Long-term average 90.7 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,134 hours spilling →	Leigham Mill Stream	94	1,134	down 8%	100%
Buckland Brewer STW Inlet overflow at sewage works Sewage works Buckland Brewer Company site name BUCKLAND BREWER STW_SO_BUCKLAND BREWER EA ID / permit SBB00180 · DRA 1513 Outlet location SS41902030 (OS grid reference) · View on Apple Maps WFD catchment Duntz (GB108050014360) 2024 spills / hours 115 / 1,482 Long-term average 60.4 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation ongoing, Operational investigation ongoing Improvement UWWTR improvement completed Volume & pollution Estimate from 1,129 hours spilling →	Trib of River Yeo (Bideford)	63	1,129	down 45%	100%
Offwell Wastewater Treatment Works Inlet overflow at sewage works Sewage works Offwell Company site name OFFWELL STW_SO_OFFWELL EA ID / permit SBB00866 · 200366 Outlet location SY19169889 (OS grid reference) · View on Apple Maps WFD catchment Offwell Brook (GB108045008840) 2024 spills / hours 41 / 427 Long-term average 54.4 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,124 hours spilling →	Trib of Offwell Brook	71	1,124	up 73%	100%
Lustleigh Wastewater Treatment Work Storm tank at sewage works Sewage works Lustleigh Wastewater Treatment Work Company site name LUSTLEIGH STW_SSO_BOVEY TRACEY EA ID / permit SBB00722 · NRA-SW-7351 Outlet location SX78688093 (OS grid reference) · View on Apple Maps WFD catchment Wray Brook (GB108046008330) Shellfish water Teign Estuary 2024 spills / hours 88 / 1,313 Long-term average 88.1 spills a year (monitored since 2017) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,124 hours spilling →	Wray Brook	72	1,124	down 18%	99%
Holcombe Rogus WwTW Storm tank at sewage works Sewage works Holcombe Rogus Company site name HOLCOMBE ROGUS STW_SSO_HOLCOMBE ROGUS EA ID / permit SBB00579 · SWWA 2475 Outlet location ST06391798 (OS grid reference) · View on Apple Maps WFD catchment Spratford Stream (GB108045015020) 2024 spills / hours 122 / 1,739 Long-term average 112.8 spills a year (monitored since 2019) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,111 hours spilling →	Trib of River Lyner	75	1,111	down 39%	99%
Hartland Wastewater Treatment Works Storm tank at sewage works Sewage works Hartland Company site name HARTLAND STW_SSO_HARTLAND EA ID / permit SBB00543 · NRA-SW-6967 Outlet location SS25332474 (OS grid reference) · View on Apple Maps WFD catchment Abbey River (GB108050014050) 2024 spills / hours 114 / 1,380 Long-term average 97.5 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,101 hours spilling →	Abbey River	93	1,101	down 18%	98%
East Ogwell WwTW Storm tank at sewage works Sewage works East Ogwell Company site name EAST OGWELL STW_SSO_EAST OGWELL EA ID / permit SBB00393 · DRA 239 Outlet location SX84127089 (OS grid reference) · View on Apple Maps WFD catchment Lemon (GB108046008450) Shellfish water Teign Estuary 2024 spills / hours 92 / 1,533 Long-term average 92.8 spills a year (monitored since 2017) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,099 hours spilling →	River Lemon	68	1,099	down 26%	100%
St Cleer Wastewater Treatment Works Storm tank at sewage works Sewage works St Cleer Company site name ST CLEER STW_SSO_LISKEARD EA ID / permit SBB01124 · 302956 Outlet location SX26036791 (OS grid reference) · View on Apple Maps WFD catchment Seaton (GB108048002320) 2024 spills / hours 125 / 2,324 Long-term average 94.9 spills a year (monitored since 2017) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement UWWTR improvement completed Volume & pollution Estimate from 1,096 hours spilling →	Tremar Stream	67	1,096	down 46%	100%
Honiton Wastewater Treatment Works Storm tank at sewage works Sewage works Honiton Company site name HONITON STW_SSO_HONITON EA ID / permit SBB00592 · NRA-SW-3869 Outlet location ST15220094 (OS grid reference) · View on Apple Maps WFD catchment Middle River Otter (GB108045009180) 2024 spills / hours 219 / 3,808 Long-term average 140.3 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,096 hours spilling →	River Otter	75	1,096	down 66%	100%
Okehampton STW Storm tank at sewage works Sewage works Okehampton Company site name HILL BARTON STW_SSO_OKEHAMPTON EA ID / permit SBB00869 · 202463 Outlet location SX60049825 (OS grid reference) · View on Apple Maps WFD catchment Middle River Okement (GB108050008110) 2024 spills / hours 107 / 1,227 Long-term average 77.9 spills a year (monitored since 2016) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,091 hours spilling →	River Okement(S)	87	1,091	down 19%	100%
Seaton Pumping Station Storm discharge at pumping station Company site name SEATON SPS_PSCSOEO_SEATON EA ID / permit SBB01066 · 037806/PC/01 Outlet location SX30165418 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment Bathing water Seaton (Cornwall) 2024 spills / hours 90 / 1,591 Long-term average 76.0 spills a year (monitored since 2010) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 1,071 hours spilling →	English Channel	67	1,071	down 26%	100%
St Dominick Pumping Station Storm discharge at pumping station Company site name ST DOMINICK_PSCSOEO_SALTASH EA ID / permit SBB01130 · 301636 Outlet location SX39766791 (OS grid reference) · View on Apple Maps WFD catchment Cotehele Stream (GB108047004070) 2024 spills / hours 80 / 1,150 Long-term average 60.6 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,067 hours spilling →	Trib of River Tamar	72	1,067	down 10%	100%
Christow Wastewater Treatment Works Storm tank at sewage works Sewage works Christow Company site name CHRISTOW STW_SSO_TEIGN VALLEY EA ID / permit SBB00251 · NRA-SW-6620 Outlet location SX84058538 (OS grid reference) · View on Apple Maps WFD catchment Teign (Lower) (GB108046008540) 2024 spills / hours 99 / 1,713 Long-term average 83.6 spills a year (monitored since 2016) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,054 hours spilling →	River Teign	61	1,054	down 38%	100%
North Tawton WwTW Storm tank at sewage works Sewage works North Tawton Company site name NORTH TAWTON STW_SSO_NORTH TAWTON EA ID / permit SBB00851 · NRA-SW-0005 Outlet location SS65460196 (OS grid reference) · View on Apple Maps WFD catchment Taw (Source to Bullow Brook) (GB108050008250) 2024 spills / hours 92 / 2,173 Long-term average 79.1 spills a year (monitored since 2017) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,049 hours spilling →	River Taw	61	1,049	down 34%	95%
Warbstow STW_SO_WARBSTOW Inlet overflow at sewage works Sewage works Warbstow Warbstow EA ID / permit SBB01403 · Unpermitted Outlet location SX20799055 (OS grid reference) · View on Apple Maps WFD catchment Canworthy Water (GB108047007790) 2024 spills / hours 20 / 41 Long-term average 28.7 spills a year (monitored since 2023) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,049 hours spilling →	Tributary of Middle River Ottery	66	1,049	up 230%	100%
Camels Head WwTW Inlet overflow at sewage works Sewage works Camels Head Company site name CAMELS HEAD STW_SO_PLYMOUTH EA ID / permit SBB00206 · 303000 Outlet location SX44665714 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 79 / 1,032 Long-term average 74.0 spills a year (monitored since 2017) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,049 hours spilling →	Weston Mill Lake(E)	63	1,049	down 20%	100%
Dalwood Pumping Station Storm discharge at pumping station Company site name DALWOOD SPST_PSCSOEO_DALWOOD EA ID / permit SBB00345 · 203072 Outlet location SY25019988 (OS grid reference) · View on Apple Maps WFD catchment Corry Brook (GB108045009300) 2024 spills / hours 97 / 1,610 Long-term average 60.5 spills a year (monitored since 2022) High-spill reason (company) Not Applicable - Ongoing investigation Monitor below 90% Power failure / issue · Resolved - Jul Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,042 hours spilling →	The Corry Brook (S)	65	1,042	down 33%	88%
Broadhempston WwTW CSO Inlet overflow at sewage works Sewage works Broadhempston Company site name BROADHEMPSTON STW_SSO_BROADHEMPSTON EA ID / permit SBB00165 · NRA-SW-1075 Outlet location SX79806563 (OS grid reference) · View on Apple Maps WFD catchment Hems - Upper (GB108046005230) 2024 spills / hours 105 / 1,791 Long-term average 133.0 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,039 hours spilling →	Broadhempston Stream	57	1,039	down 46%	100%
Bere Alston STW Inlet overflow at sewage works Sewage works Bere Alston Company site name BERE ALSTON STW_SO_BERE ALSTON EA ID / permit SBB00099 · NRA-SW-3792 Outlet location SX42716630 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 134 / 1,658 Long-term average 140.1 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,031 hours spilling →	Tidal River Tamar	91	1,031	down 32%	100%
Harewood Road CSO Overflow on sewer network Company site name HAREWOOD RD_CSO_CALSTOCK EA ID / permit SBB00540 · 301833 Outlet location SX43636844 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 152 / 988 Long-term average 164.7 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,029 hours spilling →	River Tamar (Estuarine)	164	1,029	up 8%	100%
North Molton STW Storm tank at sewage works Sewage works North Molton Company site name NORTH MOLTON STW_SSO_NORTH MOLTON EA ID / permit SBB00842 · SWWA 224 Outlet location SS74502970 (OS grid reference) · View on Apple Maps WFD catchment Mole (Source to Burcombe Stream) (GB108050019970) 2024 spills / hours 99 / 1,565 Long-term average 139.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,017 hours spilling →	River Mole	85	1,017	down 14%	100%
Halwill Sewage Treatment Works Inlet overflow at sewage works Sewage works Halwill Company site name HALWILL STW_SO_HALWILL EA ID / permit SBB00530 · 2027 Outlet location SX42959914 (OS grid reference) · View on Apple Maps WFD catchment Carey (GB108047008040) 2024 spills / hours 110 / 1,491 Long-term average 125.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,014 hours spilling →	(S) River Carey	85	1,014	down 23%	100%
West Buckland STW Inlet overflow at sewage works Sewage works West Buckland Company site name WEST BUCKLAND STW_SO_BARNSTAPLE EA ID / permit SBB01336 · 202213 Outlet location SS65903110 (OS grid reference) · View on Apple Maps WFD catchment Bray (Mole to Hole Water) (GB108050019910) 2024 spills / hours 102 / 1,090 Long-term average 70.3 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,007 hours spilling →	Tributary of River Mole(S)	94	1,007	down 8%	99%
Callington WwTW Storm tank at sewage works Sewage works Callington Company site name CALLINGTON STW_SSO_CALLINGTON EA ID / permit SBB00202 · 303508 Outlet location SX34056890 (OS grid reference) · View on Apple Maps WFD catchment Lower River Lynher (GB108047007670) 2024 spills / hours 74 / 1,129 Long-term average 64.9 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,006 hours spilling →	Haye Valley Stream	62	1,006	down 16%	100%
Woodbury WwTW Storm tank at sewage works Sewage works Woodbury Company site name WOODBURY_SSO_WOODBURY EA ID / permit SBB01374 · 202848 Outlet location SX99798678 (OS grid reference) · View on Apple Maps WFD catchment Polly Brook (GB108045008980) Shellfish water Exe Estuary 2024 spills / hours 133 / 2,202 Long-term average 107.4 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,002 hours spilling →	Woodbury Brook	81	1,002	down 39%	100%
Cornworthy WwTW Storm tank at sewage works Sewage works Cornworthy Company site name CORNWORTHY STW_SSO_DARTMOUTH EA ID / permit SBB00309 · 200926 Outlet location SX82605569 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment Shellfish water Dart 2024 spills / hours 103 / 1,574 Long-term average 119.0 spills a year (monitored since 2016) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement UWWTR improvement completed Volume & pollution Estimate from 1,001 hours spilling →	Trib of the Dart Estuary	74	1,001	down 28%	100%
Littleham STW Storm tank at sewage works Sewage works Littleham Company site name LITTLEHAM STW_SSO_LITTLEHAM EA ID / permit SBB00699 · 203010 Outlet location SS43532310 (OS grid reference) · View on Apple Maps WFD catchment Upper River Yeo (Bideford) (GB108050014470) 2024 spills / hours 99 / 1,237 Long-term average 52.8 spills a year (monitored since 2022) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,000 hours spilling →	Trib of River Yeo(S)	80	1,000	down 19%	100%
Slapton Wastewater Treatment Works Storm tank at sewage works Sewage works Slapton Company site name SLAPTON STW_SSO_SLAPTON EA ID / permit SBB01093 · 203034 Outlet location SX82054438 (OS grid reference) · View on Apple Maps WFD catchment Avon (Devon Tidal) and Sth Hams - Slapton (GB108046004810) 2024 spills / hours 149 / 2,299 Long-term average 60.1 spills a year (monitored since 2010) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement ongoing Volume & pollution Estimate from 997 hours spilling →	Start Bay/Slapton Ley	72	997	down 52%	100%
Exton North PS Storm discharge at pumping station Company site name EXTON NORTH SPS_PSCSOEO_EXMOUTH EA ID / permit SBB00434 · 203229 Outlet location SX97698689 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment Shellfish water Exe Estuary 2024 spills / hours 94 / 1,305 Long-term average 108.3 spills a year (monitored since 2016) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 996 hours spilling →	River Clyst (Estuarine)	83	996	down 12%	100%
Kilmington WwTW Storm tank at sewage works Sewage works Kilmington Company site name KILMINGTON STW_SSO_AXMINSTER EA ID / permit SBB00631 · DRA 1559 Outlet location SY27869759 (OS grid reference) · View on Apple Maps WFD catchment Lower Axe (GB108045008870) 2024 spills / hours 158 / 1,181 Long-term average 163.0 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 995 hours spilling →	River Axe	110	995	down 30%	100%
Bickleigh WwTW Inlet overflow at sewage works Sewage works Bickleigh Company site name BICKLEIGH STW_SO_BICKLEIGH EA ID / permit SBB00104 · SWWA 488 Outlet location SS94010700 (OS grid reference) · View on Apple Maps WFD catchment Exe (Barle to Culm) (GB108045015050) 2024 spills / hours 100 / 1,442 Long-term average 89.2 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 992 hours spilling →	Trib of River Exe	79	992	down 21%	100%
Horrabridge WwTW Storm tank at sewage works Sewage works Horrabridge Company site name HORRABRIDGE STW_SSO_HORRABRIDGE EA ID / permit SBB00598 · 302126 Outlet location SX49777043 (OS grid reference) · View on Apple Maps WFD catchment Walkham (GB108047007870) 2024 spills / hours 74 / 1,491 Long-term average 110.3 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 985 hours spilling →	River Walkham	53	985	down 28%	97%
Lewdown Wastewater Treatment Works Storm tank at sewage works Sewage works Lewdown Company site name LEWDOWN STW_SSO_LEWDOWN EA ID / permit SBB00687 · NRA-SW-6982 Outlet location SX44788747 (OS grid reference) · View on Apple Maps WFD catchment Thrushel (GB108047008010) 2024 spills / hours 83 / 1,286 Long-term average 63.7 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 981 hours spilling →	Tributary of River Thrushel	57	981	down 31%	100%
Bere Alston STW Storm tank at sewage works Sewage works Bere Alston Company site name BERE ALSTON STW_SSO_BERE ALSTON EA ID / permit SBB00098 · NRA-SW-3791 Outlet location SX42716630 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 129 / 1,512 Long-term average 149.1 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement UWWTR improvement completed, Operational improvement ongoing Volume & pollution Estimate from 979 hours spilling →	(E)Tidal River Tamar	82	979	down 36%	100%
Colyton & Colyford WwTW Storm tank at sewage works Sewage works Colyton And Colyford Company site name COLYTON STW_SSO_COLYTON EA ID / permit SBB00291 · DRA 441 Outlet location SY25929270 (OS grid reference) · View on Apple Maps WFD catchment Lower Axe (GB108045008870) 2024 spills / hours 96 / 1,144 Long-term average 75.2 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 976 hours spilling →	River Axe	75	976	down 22%	100%
Blackawton Sewage Treatment Works Storm tank at sewage works Sewage works Blackawton Company site name BLACKAWTON STW_SSO_BLACKAWTON EA ID / permit SBB00118 · NPSWQD006916 Outlet location SX80505043 (OS grid reference) · View on Apple Maps WFD catchment The Gara (GB108046004930) 2024 spills / hours 54 / 840 Long-term average 83.3 spills a year (monitored since 2019) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 974 hours spilling →	Blackawton Stream	56	974	up 4%	100%
Barnstaple (Ashford) STW Storm tank at sewage works Sewage works Barnstaple Company site name ASHFORD STW_SSO_BARNSTAPLE EA ID / permit SBB00072 · 2491 Outlet location SS53253406 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment Shellfish water Taw-Torridge Estuary 2024 spills / hours 113 / 1,613 Long-term average 81.2 spills a year (monitored since 2010) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 973 hours spilling →	River Taw Estuary	76	973	down 33%	100%
Gunnislake WwTW Storm tank at sewage works Sewage works Gunnislake Company site name GUNNISLAKE STW_SSO_GUNNISLAKE EA ID / permit SBB00523 · SWWA 2413 Outlet location SX43437067 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 161 / 3,051 Long-term average 119.5 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 956 hours spilling →	River Tamar (Estuarine)	94	956	down 42%	100%
Buckland Wastewater Treatment Works Storm tank at sewage works Sewage works Buckland Company site name BUCKLAND STW_SSO_NEWTON ABBOT EA ID / permit SBB00183 · 202009 Outlet location SX96067143 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment Shellfish water Teign Estuary 2024 spills / hours 116 / 1,591 Long-term average 89.0 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 954 hours spilling →	English Channel (Coastal)	75	954	down 35%	100%
Buckland Monachorum WwTW Storm tank at sewage works Sewage works Buckland Monachorum Company site name BUCKLAND MONACHORUM STW_SSO_BUCKLAND MON EA ID / permit SBB00181 · SWWA 877 Outlet location SX48686836 (OS grid reference) · View on Apple Maps WFD catchment Lower River Tavy (GB108047007840) 2024 spills / hours 65 / 1,014 Long-term average 104.1 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 942 hours spilling →	Tributary of the River Tavy	52	942	down 20%	100%

Sewage treatment works

Storm tanks and inlet overflows at each South West 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.