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
Salcombe Regis WwTW CSO Inlet overflow at sewage works Sewage works Salcombe Regis Company site name SALCOMBE REGIS STW_SO_SALCOMBE REGIS EA ID / permit SBB01043 · NRA-SW-1505 Outlet location SY14728839 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 366 / 8,773 Long-term average 206.3 spills a year (monitored since 2022) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, Operational improvement completed Volume & pollution Estimate from 5,446 hours spilling →	Salcombe Regis Stream	235	5,446	down 36%	100%
Shop STW_SO_SHOP Inlet overflow at sewage works Sewage works Shop Shop EA ID / permit SBB01407 · Unpermitted Outlet location SS22851460 (OS grid reference) · View on Apple Maps WFD catchment Coombe Valley Stream (GB108049013760) 2024 spills / hours 88 / 1,064 Long-term average 110.3 spills a year (monitored since 2023) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 4,967 hours spilling →	Tributary of Coombe Valley Stream	243	4,967	up 176%	100%
Tatworth WwTW Storm tank at sewage works Sewage works Tatworth Company site name TATWORTH STW_SSO_TATWORTH EA ID / permit SBB01209 · 203249 Outlet location ST33710479 (OS grid reference) · View on Apple Maps WFD catchment Forton Brook (GB108045014820) 2024 spills / hours 210 / 4,137 Long-term average 134.7 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 4,141 hours spilling →	Forton Brook	189	4,141	down 10%	100%
Brayford STW Inlet overflow at sewage works Sewage works Brayford Company site name BRAYFORD STW_SO_BRAYFORD EA ID / permit SBB00148 · 202187/CS/01 Outlet location SS68403440 (OS grid reference) · View on Apple Maps WFD catchment Bray (Source to Hole Water) (GB108050019950) 2024 spills / hours 205 / 4,512 Long-term average 138.8 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 3,763 hours spilling →	River Bray(S)	172	3,763	down 16%	99%
Chacewater STW Storm tank at sewage works Sewage works Chacewater Company site name CHACEWATER STW_SSO_CHACEWATER EA ID / permit SBB00224 · NRA-SW-6619 Outlet location SW75274409 (OS grid reference) · View on Apple Maps WFD catchment Upper Carnon River (GB108048001160) Shellfish water Fal Estuary 2024 spills / hours 152 / 3,034 Long-term average 136.2 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 3,542 hours spilling →	(S) River Carnon	159	3,542	up 5%	100%
Altarnun STW (Storm Tank) Storm tank at sewage works Sewage works Altarnun Company site name ALTARNUN STW_SSO_ALTARNUN EA ID / permit SBB00043 · SWWA 154 Outlet location SX22408140 (OS grid reference) · View on Apple Maps WFD catchment Penpont Water (GB108047007700) 2024 spills / hours 206 / 3,918 Long-term average 166.2 spills a year (monitored since 2021) 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 3,295 hours spilling →	Penpont Water	165	3,295	down 20%	100%
Praze An Beeble STW Storm tank at sewage works Sewage works Praze An Beeble Company site name PRAZE AN BEEBLE STW_SSO_PRAZE AN BEEBLE EA ID / permit SBB00980 · NRA-SW-7821 Outlet location SW63273584 (OS grid reference) · View on Apple Maps WFD catchment Roseworthy Stream (GB108049000560) 2024 spills / hours 177 / 3,744 Long-term average 100.6 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 3,153 hours spilling →	(S) Praze River	147	3,153	down 17%	100%
Tiverton STW Storm tank at sewage works Sewage works Tiverton Company site name TIVERTON STW_SSO_TIVERTON EA ID / permit SBB01247 · 201437 Outlet location SS95301030 (OS grid reference) · View on Apple Maps WFD catchment Exe (Barle to Culm) (GB108045015050) 2024 spills / hours 171 / 3,439 Long-term average 89.8 spills a year (monitored since 2019) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 3,152 hours spilling →	River Exe	160	3,152	down 6%	92%
Pyworthy Sewage Treatment Works Storm tank at sewage works Sewage works Pyworthy Company site name PYWORTHY STW_SSO_PYWORTHY EA ID / permit SBB00994 · 302417 Outlet location SS30070326 (OS grid reference) · View on Apple Maps WFD catchment Derril Water (GB108047008070) 2024 spills / hours 171 / 3,332 Long-term average 179.2 spills a year (monitored since 2020) 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 2,919 hours spilling →	Derril Water(S)	146	2,919	down 15%	100%
Delabole Wastewater Treatment Works Storm tank at sewage works Sewage works Delabole Company site name DELABOLE STW_SSO_DELABOLE EA ID / permit SBB00357 · NRA-SW-4934 Outlet location SX07298294 (OS grid reference) · View on Apple Maps WFD catchment Allen (GB108049007050) 2024 spills / hours 162 / 3,264 Long-term average 140.2 spills a year (monitored since 2016) 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 2,903 hours spilling →	River Allen	148	2,903	down 9%	99%
Cheriton Fitzpaine WwTW Storm tank at sewage works Sewage works Cheriton Fitzpaine Company site name CHERITON FITZPAINE STW_SSO_CHERITON F EA ID / permit SBB00242 · 202985 Outlet location SS85800615 (OS grid reference) · View on Apple Maps WFD catchment Holly Water (GB108045014900) 2024 spills / hours 188 / 3,864 Long-term average 162.3 spills a year (monitored since 2021) 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 2,808 hours spilling →	Tributary of Holly Water	140	2,808	down 26%	99%
Gwennap Wastewater Treatment Works Storm tank at sewage works Sewage works Gwennap Company site name GWENNAP STW_SSO_LANNER ST DAY EA ID / permit SBB00526 · NRA-SW-5475 Outlet location SW74864044 (OS grid reference) · View on Apple Maps WFD catchment Hicks Mill Stream (GB108048001150) 2024 spills / hours 126 / 2,520 Long-term average 128.8 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 2,673 hours spilling →	Hicks Mill Stream	141	2,673	up 12%	98%
Ponsanooth STW SSO Inlet overflow at sewage works Sewage works Ponsanooth Company site name PONSANOOTH STW_SSO_PONSANOOTH EA ID / permit SBB00957 · NRA-SW-1484 Outlet location SW76403780 (OS grid reference) · View on Apple Maps WFD catchment Kennal (GB108048001140) 2024 spills / hours 171 / 3,687 Long-term average 97.8 spills a year (monitored since 2021) 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 2,646 hours spilling →	River Kennal	126	2,646	down 26%	100%
Folly Gate WwTW SSO Storm tank at sewage works Sewage works Folly Gate Company site name FOLLY GATE STW_SSO_FOLLY GATE EA ID / permit SBB00464 · NRA-SW-1243 Outlet location SX57269811 (OS grid reference) · View on Apple Maps WFD catchment Middle River Okement (GB108050008110) 2024 spills / hours 200 / 4,175 Long-term average 127.8 spills a year (monitored since 2022) 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 2,580 hours spilling →	Trib of Beckamoor Brook	126	2,580	down 37%	100%
Rewe Wastewater Treatment Works Storm tank at sewage works Sewage works Rewe Company site name REWE STW_SSO_REWE EA ID / permit SBB01024 · DRA 308 Outlet location SX94559884 (OS grid reference) · View on Apple Maps WFD catchment Lower Culm (GB108045014970) 2024 spills / hours 115 / 827 Long-term average 118.2 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 2,568 hours spilling →	River Culm	175	2,568	up 52%	100%
Mary Tavy WwTW Storm tank at sewage works Sewage works Mary Tavy Company site name MARY TAVY STW_SSO_MARY TAVY EA ID / permit SBB00753 · 15/47/41/P/5 Outlet location SX50887831 (OS grid reference) · View on Apple Maps WFD catchment Upper River Tavy (GB108047007950) 2024 spills / hours 169 / 3,505 Long-term average 142.0 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 No improvement action in reporting period Volume & pollution Estimate from 2,547 hours spilling →	Cholwell Brook	126	2,547	down 25%	100%
Kenn and Kennford Pumping Station Storm discharge at pumping station Company site name KENN/KENNFORD SPS_PSCSOEO_KENNFORD EA ID / permit SBB00626 · 202371 Outlet location SX92758527 (OS grid reference) · View on Apple Maps WFD catchment Kenn (GB108045009010) 2024 spills / hours 52 / 947 Long-term average 104.7 spills a year (monitored since 2016) 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 2,543 hours spilling →	River Kenn	124	2,543	up 138%	100%
Harbertonford WwTW Storm tank at sewage works Sewage works Harbertonford Company site name HARBERTONFORD STW_SSO_HARBERTONFORD EA ID / permit SBB00537 · 203562 Outlet location SX79155597 (OS grid reference) · View on Apple Maps WFD catchment Harbourne River (GB108046005170) 2024 spills / hours 166 / 3,518 Long-term average 120.3 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 2,494 hours spilling →	Harbourne River	120	2,494	down 28%	98%
Gratton Wastewater Treatment Works Storm tank at sewage works Sewage works Gratton Company site name GRATTON STW_SSO_YELVERTON EA ID / permit SBB00515 · 302125 Outlet location SX52346670 (OS grid reference) · View on Apple Maps WFD catchment Meavy (GB108047003660) 2024 spills / hours 161 / 2,842 Long-term average 118.1 spills a year (monitored since 2018) 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 2,484 hours spilling →	River Meavy	143	2,484	down 11%	100%
Dunsford WwTW Inlet overflow at sewage works Sewage works Dunsford Company site name DUNSFORD STW_SO_TEIGN VALLEY EA ID / permit SBB00388 · DRA 1196 Outlet location SX81998897 (OS grid reference) · View on Apple Maps WFD catchment Reedy Brook (GB108046008590) 2024 spills / hours 186 / 4,042 Long-term average 148.1 spills a year (monitored since 2010) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 2,471 hours spilling →	River Teign & Reedy Brook	110	2,471	down 41%	100%
39 St Michaels Combined Sewer of Overflow on sewer network Company site name 39 ST MICHAELS ROAD_CSO_PONSONOOTH EA ID / permit SBB00027 · 301808 Outlet location SW76083769 (OS grid reference) · View on Apple Maps WFD catchment Kennal (GB108048001140) Shellfish water Fal Estuary 2024 spills / hours 172 / 2,694 Long-term average 123.8 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 2,438 hours spilling →	River Kennall	153	2,438	down 11%	100%
Witheridge STW_SSO_WITHERIDGE Storm tank at sewage works Sewage works Witheridge Witheridge EA ID / permit SBB01121 · Permit applied for Outlet location SS79991448 (OS grid reference) · View on Apple Maps WFD catchment Lower Little River Dart (GB108050014340) 2024 spills / hours 158 / 2,664 Long-term average 150.0 spills a year (monitored since 2023) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 2,425 hours spilling →	Stream joining Lower Little Dart River	142	2,425	down 10%	100%
Dulford Pscso/EO Storm discharge at pumping station Company site name DULFORD SPST_PSCSOEO_DULFORD EA ID / permit SBB00379 · 201670 Outlet location ST06970596 (OS grid reference) · View on Apple Maps WFD catchment Weaver (GB108045009110) 2024 spills / hours 283 / 6,198 Long-term average 168.3 spills a year (monitored since 2022) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 2,411 hours spilling →	Weaver (S)	132	2,411	down 53%	100%
Stoke Hill WwTW Storm tank at sewage works Sewage works Stoke Hill Company site name STOKE HILL STW_SSO_CRAPSTONE EA ID / permit SBB01180 · 302908 Outlet location SX50576729 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 147 / 2,969 Long-term average 143.9 spills a year (monitored since 2017) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 2,368 hours spilling →	Milton Stream	135	2,368	down 8%	100%
Bridge PS / CSO / EO Storm discharge at pumping station Company site name BRIDGE SPST_PSCSOEO_PORTREATH EA ID / permit SBB00155 · 300702 Outlet location SW66104614 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment Bathing water Portreath 2024 spills / hours 142 / 2,669 Long-term average 118.0 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 2,333 hours spilling →	Atlantic Ocean (C)	134	2,333	down 6%	100%
Metherell WwTW Storm tank at sewage works Sewage works Metherell Company site name METHERELL STW_SSO_METHERELL EA ID / permit SBB00764 · NRA-SW-4999 Outlet location SX41066927 (OS grid reference) · View on Apple Maps WFD catchment Cotehele Stream (GB108047004070) 2024 spills / hours 175 / 3,935 Long-term average 134.7 spills a year (monitored since 2019) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 2,299 hours spilling →	Tributary of River Tamar	118	2,299	down 33%	93%
Lamerton STW Inlet overflow at sewage works Sewage works Lamerton Company site name LAMERTON STW_SO_LAMERTON EA ID / permit SBB00658 · 302128 Outlet location SX45387556 (OS grid reference) · View on Apple Maps WFD catchment Lumburn (GB108047007850) 2024 spills / hours 139 / 2,776 Long-term average 118.8 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 2,167 hours spilling →	River Lumburn (S)	109	2,167	down 22%	100%
Gratton CSO Overflow on sewer network Company site name GRATTON_CSO_YELVERTON EA ID / permit SBB00514 · 301897 Outlet location SX52826701 (OS grid reference) · View on Apple Maps WFD catchment Meavy (GB108047003660) 2024 spills / hours 211 / 2,583 Long-term average 159.2 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 2,124 hours spilling →	River Meavy	167	2,124	down 21%	100%
Heathfield STW Storm tank at sewage works Sewage works Heathfield Company site name HEATHFIELD STW_SSO_NEWTON ABBOT EA ID / permit SBB00557 · 203812 Outlet location SX83847640 (OS grid reference) · View on Apple Maps WFD catchment Lower Bovey (GB108046008470) Shellfish water Teign Estuary 2024 spills / hours 145 / 2,826 Long-term average 97.6 spills a year (monitored since 2016) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Env Act (SODRP) improvement ongoing, UWWTR improvement ongoing Volume & pollution Estimate from 2,113 hours spilling →	River Bovey(S)	106	2,113	down 27%	99%
Payhembury STW Storm tank at sewage works Sewage works Payhembury Company site name PAYHEMBURY STW_SSO_PAYHEMBURY EA ID / permit SBB01396 · SWWA 2498 Outlet location ST08720124 (OS grid reference) · View on Apple Maps WFD catchment Tale (GB108045009200) 2024 spills / hours 279 / 5,373 Long-term average 140.3 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - hydraulic capacity Monitor below 90% Capital / maintenance works affect EDM operation · Resolved - Jun Investigation UWWTR investigation completed, Operational investigation completed Improvement UWWTR improvement completed, Operational improvement completed Volume & pollution Estimate from 2,058 hours spilling →	Little Mere River	119	2,058	down 57%	80%
Cot Valley Pumping Station Storm discharge at pumping station Company site name COT VALLEY_PSCSOEO_ST JUST EA ID / permit SBB00310 · 303092 Outlet location SW35503100 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 81 / 1,578 Long-term average 50.2 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 2,056 hours spilling →	Atlantic / Porth Nanven Stream	100	2,056	up 23%	100%
Kingston WwTW Storm tank at sewage works Sewage works Kingston Company site name KINGSTON STW_SSO_KINGSTON EA ID / permit SBB00644 · 203413 Outlet location SX63854739 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 119 / 2,521 Long-term average 114.8 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 2,043 hours spilling →	Kingston Stream	103	2,043	down 13%	100%
Horns Cross Sewage Treatment Works Inlet overflow at sewage works Sewage works Horns Cross Company site name HORNS CROSS STW_SO_HORNS CROSS EA ID / permit SBB00597 · 200403 Outlet location SS38852320 (OS grid reference) · View on Apple Maps WFD catchment Upper River Yeo (Bideford) (GB108050014470) 2024 spills / hours 229 / 1,603 Long-term average 170.5 spills a year (monitored since 2022) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 2,035 hours spilling →	Tributary of River Yeo	230	2,035	no change	100%
St Neot STW Inlet overflow at sewage works Sewage works St Neot Company site name ST NEOT STW_SO_ST NEOT EA ID / permit SBB01155 · NRA-SW-3674 Outlet location SX18706737 (OS grid reference) · View on Apple Maps WFD catchment St Neot River (GB108048007640) 2024 spills / hours 245 / 2,522 Long-term average 228.3 spills a year (monitored since 2021) 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 2,031 hours spilling →	St Neot River	167	2,031	down 32%	100%
South Molton WwTW Storm tank at sewage works Sewage works South Molton Company site name SOUTH MOLTON STW_SSO_SOUTH MOLTON EA ID / permit SBB01101 · NRA-SW-5654 Outlet location SS72252572 (OS grid reference) · View on Apple Maps WFD catchment Mole (Yeo to Burcombe Stream) (GB108050014130) 2024 spills / hours 170 / 2,729 Long-term average 102.3 spills a year (monitored since 2017) 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 2,014 hours spilling →	River Mole	143	2,014	down 16%	100%
Walkhampton WwTW SSO Storm tank at sewage works Sewage works Walkhampton Company site name WALKHAMPTON STW_SSO_WALKHAMPTON EA ID / permit SBB01313 · NRA-SW-1679 Outlet location SX53087010 (OS grid reference) · View on Apple Maps WFD catchment Walkham (GB108047007870) 2024 spills / hours 77 / 1,308 Long-term average 87.5 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation UWWTR investigation completed, Operational investigation completed Improvement UWWTR improvement completed Volume & pollution Estimate from 2,012 hours spilling →	Trib of River Walkham	104	2,012	up 35%	100%
Lutton STW Storm tank at sewage works Sewage works Lutton Company site name LUTTON STW_SSO_LUTTON EA ID / permit SBB00724 · 033125/SS/01 Outlet location SX59875917 (OS grid reference) · View on Apple Maps WFD catchment Piall (GB108047004020) 2024 spills / hours 118 / 2,074 Long-term average 81.4 spills a year (monitored since 2021) 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 1,954 hours spilling →	(S) River Piall	118	1,954	no change	100%
Grampound Road Pumping Station Storm discharge at pumping station Company site name GRAMPOUND ROAD SPST_PSCSOEO_GRAMPOUND EA ID / permit SBB00510 · 301655 Outlet location SW93615013 (OS grid reference) · View on Apple Maps WFD catchment Lower River Fal (GB108048001270) 2024 spills / hours 144 / 2,638 Long-term average 124.6 spills a year (monitored since 2018) 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 1,932 hours spilling →	River Fal	132	1,932	down 8%	100%
Goonhavern WwTW Storm tank at sewage works Sewage works Goonhavern Company site name GOONHAVERN STW_SSO_GOONHAVERN EA ID / permit SBB00500 · NRA-SW-3701 Outlet location SW77735300 (OS grid reference) · View on Apple Maps WFD catchment Bolingey Stream (GB108049000700) 2024 spills / hours 111 / 2,018 Long-term average 100.2 spills a year (monitored since 2020) 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 1,921 hours spilling →	Trib of the Bolingey Stream	115	1,921	up 4%	97%
Chulmleigh WwTW SSO Storm tank at sewage works Sewage works Chulmleigh Company site name CHULMLEIGH STW_SSO_CHULMLEIGH EA ID / permit SBB00257 · NRA-SW-1126 Outlet location SS68761393 (OS grid reference) · View on Apple Maps WFD catchment Lower Little River Dart (GB108050014340) 2024 spills / hours 132 / 1,920 Long-term average 137.2 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,913 hours spilling →	Little Dart River	121	1,913	down 8%	100%
High Bickington STW Inlet overflow at sewage works Sewage works High Bickington Company site name HIGH BICKINGTON STW_SO_HIGH BICKINGTON EA ID / permit SBB00568 · 202194/CS/01 Outlet location SS59162017 (OS grid reference) · View on Apple Maps WFD catchment Langham Lake (GB108050014460) 2024 spills / hours 233 / 2,657 Long-term average 186.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,912 hours spilling →	Tributary of Langham Lake(S)	173	1,912	down 26%	100%
St Austell WwTW (Menagwins) Storm tank at sewage works Sewage works St Austell Company site name MENAGWINS STW_SSO_ST AUSTELL EA ID / permit SBB01120 · 31294 Outlet location SX01175096 (OS grid reference) · View on Apple Maps WFD catchment St Austell River (GB108048002280) Bathing water Pentewan 2024 spills / hours 134 / 2,365 Long-term average 119.7 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, Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 1,891 hours spilling →	St Austell River	106	1,891	down 21%	100%
Zeal Monachorum STW Inlet overflow at sewage works Sewage works Zeal Monachorum Company site name ZEAL MONACHORUM STW_SSO_ZEAL MONACHORUM EA ID / permit SBB01393 · NRA-SW-3519 Outlet location SS72560380 (OS grid reference) · View on Apple Maps WFD catchment Upper River Yeo (Lapford) (GB108050008270) 2024 spills / hours 83 / 1,414 Long-term average 67.6 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,886 hours spilling →	River Yeo	97	1,886	up 17%	100%
Beals Mill WwTW Inlet overflow at sewage works Sewage works Beals Mill Company site name BEALS MILL STW_SO_REZARE EA ID / permit SBB00092 · SWWA 880 Outlet location SX35967707 (OS grid reference) · View on Apple Maps WFD catchment Lower River Inny (GB108047007890) 2024 spills / hours 126 / 2,171 Long-term average 49.3 spills a year (monitored since 2019) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,868 hours spilling →	River Inny	125	1,868	down 1%	100%
Scorriton STW Inlet overflow at sewage works Sewage works Scorriton Company site name SCORRITON STW_SO_SCORRITON EA ID / permit SBB01058 · 203887 Outlet location SX70746860 (OS grid reference) · View on Apple Maps WFD catchment Dart (GB108046008350) 2024 spills / hours 132 / 1,478 Long-term average 109.4 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,837 hours spilling →	Holy Brook(S)	141	1,837	up 7%	100%
Golberdon STW Inlet overflow at sewage works Sewage works Golberdon Company site name GOLBERDON STW_SO_GOLBERDON EA ID / permit SBB00495 · SWWA 2106 Outlet location SX31977092 (OS grid reference) · View on Apple Maps WFD catchment Lower River Lynher (GB108047007670) 2024 spills / hours 148 / 2,451 Long-term average 148.1 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - hydraulic capacity Investigation Operational investigation completed Improvement Env Act (SODRP) improvement ongoing, UWWTR improvement ongoing Volume & pollution Estimate from 1,782 hours spilling →	River Lynher	126	1,782	down 15%	100%
Landrake Wastewater Treatment Works Inlet overflow at sewage works Sewage works Landrake Company site name LANDRAKE STW_SO_LANDRAKE EA ID / permit SBB00661 · 303086 Outlet location SX37956095 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment 2024 spills / hours 57 / 808 Long-term average 70.2 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 1,756 hours spilling →	Landrake Stream	91	1,756	up 60%	100%
Exton South Pumping Station Storm discharge at pumping station Company site name EXTON SOUTH SPS_PSCSOEO_EXMOUTH EA ID / permit SBB00435 · 203230 Outlet location SX98098624 (OS grid reference) · View on Apple Maps WFD catchment Not part of a WFD catchment Shellfish water Exe Estuary 2024 spills / hours 88 / 1,205 Long-term average 59.0 spills a year (monitored since 2016) 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 1,741 hours spilling →	Woodbury Brook (Estuarine)	108	1,741	up 23%	100%
Polyphant Pscso/EO Storm discharge at pumping station Company site name POLYPHANT SPST_PSCSOEO_POLYPHANT EA ID / permit SBB00956 · 301646 Outlet location SX26508220 (OS grid reference) · View on Apple Maps WFD catchment Upper River Inny (GB108047007760) 2024 spills / hours 119 / 2,197 Long-term average 100.8 spills a year (monitored since 2022) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,731 hours spilling →	River Inny (S)	132	1,731	up 11%	100%
Rattery WwTW CSO Inlet overflow at sewage works Sewage works Rattery Company site name RATTERY STW_SO_RATTERY EA ID / permit SBB01016 · NRA-SW-1494 Outlet location SX74306158 (OS grid reference) · View on Apple Maps WFD catchment Bidwell Brook (GB108046005160) 2024 spills / hours 114 / 1,768 Long-term average 127.5 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1,713 hours spilling →	Bidwell Brook	107	1,713	down 6%	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.