Storm overflow register · 2025 annual return

Severn Trent Water storm overflows, 2025

Severn Trent Water reported 2,452 storm overflows in England for 2025. Together they recorded 36,471 spills over 200,361 hours, an average of 14.9 spills per overflow against 20.4 across England. That ranks 2 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 41% on 2024.

429 overflows did not spill · 72 spilled more than 60 times · 2,342 had monitors working for 90% of the year or more · 435 sewage treatment works with overflows

Hours spilling by month, 2025

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

All Severn Trent 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
Church Stretton STW Storm tank at sewage works (with treatment) Sewage works Church Stretton Company site name CHURCH STRETTON STW (SSTO) EA ID / permit SVT00558 · S/09/55956/R Outlet location SO4406090820 (OS grid reference) · View on Apple Maps WFD catchment Quinny Bk - source to conf R Onny (GB109054044350) Treatment Reed bed 2024 spills / hours 260 / 5,220 Long-term average 163.3 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 completed Volume & pollution Estimate from 3,257 hours spilling →	Trib of Quinny Brook	162	3,257	down 38%	98%
Warslow Sewage Treatment Works Inlet overflow at sewage works (with treatment) Sewage works Warslow Company site name WARSLOW STW (SSTO) EA ID / permit SVT02448 · T/26/35919/R Outlet location SK0856057790 (OS grid reference) · View on Apple Maps WFD catchment Manifold - source to conf R Dove (GB104028052891) Treatment Reed bed 2024 spills / hours 162 / 1,909 Long-term average 127.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 2,007 hours spilling →	Warslow Brook	152	2,007	down 6%	97%
Snarestone Sewage Treatment Works Storm tank at sewage works Sewage works Snarestone Company site name SNARESTONE STW (SSTO) EA ID / permit SVT02076 · T/23/35619/R Outlet location SK3369009480 (OS grid reference) · View on Apple Maps WFD catchment Mease from Source to Gilwiskaw Brook (GB104028046550) 2024 spills / hours 208 / 3,780 Long-term average 159.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement UWWTR improvement ongoing, Operational improvement completed Volume & pollution Estimate from 1,969 hours spilling →	River Mease	121	1,969	down 42%	100%
Sutton on Trent (Cromwell) WwTW Storm tank at sewage works Sewage works Sutton On Trent Company site name SUTTON ON TRENT - CROMWELL STW (SSTO) EA ID / permit SVT02251 · T/69/46017/R Outlet location SK8069362542 (OS grid reference) · View on Apple Maps WFD catchment Trent from Soar to The Beck (GB104028053110) 2024 spills / hours 237 / 3,657 Long-term average 139.0 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 completed Volume & pollution Estimate from 1,601 hours spilling →	River Trent	125	1,601	down 47%	99%
Blakeney STW (Ssto) Storm tank at sewage works Sewage works Blakeney Company site name BLAKENEY (STW) EA ID / permit SVT00291 · S/20/26262/R Outlet location SO6911006040 (OS grid reference) · View on Apple Maps WFD catchment Severn River and Trib Estuary (GB530905415403) 2024 spills / hours 197 / 2,807 Long-term average 128.5 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,579 hours spilling →	River Severn	153	1,579	down 22%	100%
Wellesbourne Sewage Treatment Works Storm tank at sewage works Sewage works Wellesbourne Company site name WELLESBOURNE STW 3DWF (SSTO) EA ID / permit SVT02487 · S/13/26721/R Outlet location SP2710055780 (OS grid reference) · View on Apple Maps WFD catchment Dene - Butlers Marston to conf R Avon (GB109054039540) 2024 spills / hours 224 / 4,008 Long-term average 101.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement UWWTR improvement ongoing, Operational improvement completed Volume & pollution Estimate from 1,509 hours spilling →	River Dene	87	1,509	down 61%	100%
Lydney Sewage Treatment Works Storm tank at sewage works Sewage works Lydney Company site name LYDNEY STW (SSTO) EA ID / permit SVT01447 · S/20/26643/R Outlet location SO6365000550 (OS grid reference) · View on Apple Maps WFD catchment SEVERN MIDDLE (GB530905415402) 2024 spills / hours 196 / 1,848 Long-term average 174.3 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Installation set-up/design issue · Resolved - Jul Investigation UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,476 hours spilling →	River Severn Estuary	178	1,476	down 9%	90%
The Crescent CSO Overflow on sewer network Company site name BRADWELL - THE CRESCENT 23 (CSO) EA ID / permit SVT02283 · T/38/21458/O Outlet location SK1753281692 (OS grid reference) · View on Apple Maps WFD catchment Noe from Peakshole Water to Derwent (GB104028057850) 2024 spills / hours 97 / 616 Long-term average 40.4 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,394 hours spilling →	Bradwell Brook	127	1,394	up 31%	100%
Matlock Lea STW Storm tank at sewage works Sewage works Matlock Lea Company site name MATLOCK LEA STW (SSTO) EA ID / permit SVT01515 · T/40/08170/R Outlet location SK3150055994 (OS grid reference) · View on Apple Maps WFD catchment Derwent from Wye to Amber (GB104028052390) 2024 spills / hours 123 / 1,773 Long-term average 79.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,282 hours spilling →	River Derwent	77	1,282	down 37%	100%
Froghall Sewage Treatment Works Storm tank at sewage works Sewage works Froghall Company site name FROGHALL STW (SSTO) EA ID / permit SVT00933 · T/30/35538/R Outlet location SK0255046950 (OS grid reference) · View on Apple Maps WFD catchment Churnet from Consall to River Dove (GB104028052652) 2024 spills / hours 85 / 1,055 Long-term average 58.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,252 hours spilling →	River Churnet	74	1,252	down 13%	100%
Hanbury STW Inlet overflow at sewage works (with treatment) Sewage works Hanbury Company site name HANBURY (WORCESTERSHIRE) STW (SSTO) EA ID / permit SVT01037 · S/19/25309/R Outlet location SO9573462424 (OS grid reference) · View on Apple Maps WFD catchment Seeley Bk - source to conf Bow Bk (GB109054043790) Treatment Reed bed 2024 spills / hours 89 / 665 Long-term average 96.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,232 hours spilling →	Tributary of Seeley Brook	71	1,232	down 20%	100%
Wessington Pumping Station Storm discharge at pumping station Company site name WESSINGTON - BACK LANE (SSO) EA ID / permit SVT02504 · T/41/40327/O Outlet location SK3859058150 (OS grid reference) · View on Apple Maps WFD catchment Amber from Press Brook to Alfreton Brook (GB104028052340) 2024 spills / hours 102 / 1,599 Long-term average 81.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,211 hours spilling →	River Amber	68	1,211	down 33%	100%
Frankton Sewage Treatment Works Storm tank at sewage works Sewage works Frankton Company site name FRANKTON STW (SSTO) EA ID / permit SVT00925 · S/12/25970/R Outlet location SP4332069411 (OS grid reference) · View on Apple Maps WFD catchment Leam - conf Rains Bk to conf R Itchen (GB109054044130) 2024 spills / hours 217 / 4,439 Long-term average 120.4 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 completed Volume & pollution Estimate from 1,191 hours spilling →	Tributary of River Leam	83	1,191	down 62%	99%
Great Glen Sewage Treatment Works Storm tank at sewage works Sewage works Great Glen Company site name GREAT GLEN STW (SSTO) EA ID / permit SVT00994 · T/51/45910/R Outlet location SP6599097416 (OS grid reference) · View on Apple Maps WFD catchment Burton Brook from Source to Sence (GB104028046630) 2024 spills / hours 21 / 168 Long-term average 67.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,185 hours spilling →	Burton Brook	69	1,185	up 229%	91%
Letwell Sewage Treatment Works Storm tank at sewage works Sewage works Letwell Company site name LETWELL STW (SSTO) EA ID / permit SVT01351 · T/76/45987/R Outlet location SK5665386851 (OS grid reference) · View on Apple Maps WFD catchment Hodsock Bk (to Oldcoates Dyke) (GB104028058190) 2024 spills / hours 100 / 1,736 Long-term average 77.2 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 completed Volume & pollution Estimate from 1,184 hours spilling →	Tributary of Carlton Beck	65	1,184	down 35%	99%
Balsall Common WwTW Inlet overflow at sewage works (with treatment) Sewage works Balsall Common Company site name BALSALL COMMON STW SRBO SPILL 1 (SSTO) EA ID / permit SVT00166 · T/11/35953/R Outlet location SP2223877770 (OS grid reference) · View on Apple Maps WFD catchment Blythe from Temple Balsall Brook to Patrick Bridge (GB104028042571) Treatment Reed bed 2024 spills / hours 45 / 658 Long-term average 29.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed Improvement UWWTR improvement ongoing, Operational improvement completed Volume & pollution Estimate from 1,129 hours spilling →	Tributary of River Blythe	77	1,129	up 71%	99%
Broadoak Sewage Treatment Works Storm tank at sewage works Sewage works Broadoak Company site name BROADOAK STW (CSO) EA ID / permit SVT00365 · S/20/25648/R Outlet location SO7023013200 (OS grid reference) · View on Apple Maps WFD catchment Severn River and Trib Estuary (GB530905415403) 2024 spills / hours 88 / 620 Long-term average 65.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,127 hours spilling →	River Severn	87	1,127	down 1%	100%
Wirksworth Sewage Treatment Works Storm tank at sewage works Sewage works Wirksworth Company site name WIRKSWORTH STW (SSTO) EA ID / permit SVT02577 · T/43/45907/R Outlet location SK2845052264 (OS grid reference) · View on Apple Maps WFD catchment Ecclesborne Catchment (trib of Derwent) (GB104028052720) 2024 spills / hours 74 / 847 Long-term average 93.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 1,121 hours spilling →	River Ecclesbourne	74	1,121	no change	100%
Bradwell Sewage Treatment Works Storm tank at sewage works Sewage works Bradwell Company site name BRADWELL STW (SSTO) EA ID / permit SVT00323 · T/38/46039/R Outlet location SK1799082230 (OS grid reference) · View on Apple Maps WFD catchment Noe from Peakshole Water to Derwent (GB104028057850) 2024 spills / hours 87 / 968 Long-term average 97.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,109 hours spilling →	Bradwell Brook	71	1,109	down 18%	100%
Madresfield (Waterloo Close) STW Inlet overflow at sewage works Sewage works Madresfield Company site name MADRESFIELD WATERLOO CLOS (STW) EA ID / permit SVT01453 · S/08/25823/R Outlet location SO8013448155 (OS grid reference) · View on Apple Maps WFD catchment Madresfield Bk - source to conf R Severn (GB109054039740) 2024 spills / hours 114 / 1,574 Long-term average 85.6 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 completed Volume & pollution Estimate from 1,094 hours spilling →	Madresfield Brook	88	1,094	down 23%	100%
Pinxton Sewage Treatment Works Storm tank at sewage works Sewage works Pinxton Company site name PINXTON STW (SSTO) EA ID / permit SVT01797 · T/61/46266/R Outlet location SK4488054000 (OS grid reference) · View on Apple Maps WFD catchment Erewash from Source to Nethergreen Brook (GB104028052740) 2024 spills / hours 103 / 1,469 Long-term average 102.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 1,022 hours spilling →	River Erewash	67	1,022	down 35%	100%
Hodsock Wastewater Treatment Works Storm tank at sewage works Sewage works Hodsock Company site name HODSOCK STW (SSTO) EA ID / permit SVT01154 · T/76/45601/R Outlet location SK5976086420 (OS grid reference) · View on Apple Maps WFD catchment Hodsock Bk (to Oldcoates Dyke) (GB104028058190) 2024 spills / hours 116 / 1,810 Long-term average 75.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement UWWTR improvement ongoing, Operational improvement completed Volume & pollution Estimate from 1,018 hours spilling →	Tributary of Carlton Beck	75	1,018	down 35%	99%
Bomere Heath STW Storm tank at sewage works Sewage works Bomere Heath Company site name BOMERE HEATH STW (SSTO) EA ID / permit SVT00304 · S/02/55802/R Outlet location SJ4731318259 (OS grid reference) · View on Apple Maps WFD catchment Severn - conf Bele Bk to conf Sundorne Bk (GB109054049142) 2024 spills / hours 72 / 1,082 Long-term average 75.8 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 998 hours spilling →	Leaton Brook	62	998	down 14%	100%
Kniveton STW Storm tank at sewage works Sewage works Kniveton Company site name KNIVETON STW (SSTO) EA ID / permit SVT01302 · T/29/35675/R Outlet location SK2077049290 (OS grid reference) · View on Apple Maps WFD catchment Henmore Brook Catch (trib of R Dove) (GB104028052700) 2024 spills / hours 94 / 616 Long-term average 88.8 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 995 hours spilling →	Kniveton Brook	84	995	down 11%	100%
Whatstandwell STW Storm tank at sewage works Sewage works Whatstandwell Company site name WHATSTANDWELL STW (SSTO) EA ID / permit SVT02530 · T/40/45704/R Outlet location SK3337253910 (OS grid reference) · View on Apple Maps WFD catchment Derwent from Wye to Amber (GB104028052390) 2024 spills / hours 112 / 2,063 Long-term average 45.6 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 987 hours spilling →	River Derwent	58	987	down 48%	100%
Ogston WTW CSO Overflow on sewer network Company site name OGSTON TREATMENT WORKS (CSO) EA ID / permit SVT01710 · T/41/07443/O Outlet location SK3810059840 (OS grid reference) · View on Apple Maps WFD catchment Amber from Source to Press Brook (GB104028052380) 2024 spills / hours 79 / 893 Long-term average 72.3 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 986 hours spilling →	River Amber	80	986	up 1%	100%
Matlock Bath - Dale Road (Coal Me- Overflow on sewer network Company site name MATLK BTH-DALE RD (COAL MERCHANTS) (CSO) EA ID / permit SVT01511 · DT/2179 Outlet location SK2958359027 (OS grid reference) · View on Apple Maps WFD catchment Derwent from Wye to Amber (GB104028052390) 2024 spills / hours 109 / 602 Long-term average 77.9 spills a year (monitored since 2017) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 977 hours spilling →	River Derwent	118	977	up 8%	100%
Worcester STW Storm tank at sewage works Sewage works Worcester Company site name WORCESTER - BROMWICH ROAD STW (SSTO) EA ID / permit SVT02635 · S/07/55380/R Outlet location SO8462053410 (OS grid reference) · View on Apple Maps WFD catchment Severn - conf R Stour to conf RIver Teme (GB109054049144) 2024 spills / hours 150 / 2,193 Long-term average 96.2 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 975 hours spilling →	River Severn	68	975	down 55%	100%
Bakewell Sewage Treatment Works Storm tank at sewage works Sewage works Bakewell Company site name BAKEWELL - PICKORY CORNER STW (SSTO) EA ID / permit SVT00161 · T/39/46184/R Outlet location SK2426265281 (OS grid reference) · View on Apple Maps WFD catchment Wye from Monk's Dale to Derwent (GB104028057820) 2024 spills / hours 95 / 1,627 Long-term average 77.0 spills a year (monitored since 2020) 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 969 hours spilling →	Tributary of River Wye	57	969	down 40%	100%
South Normanton STW Storm tank at sewage works Sewage works South Normanton Company site name SOUTH NORMANTON STW 3DWF (SSTO) EA ID / permit SVT02109 · T/41/46401/R Outlet location SK4485957679 (OS grid reference) · View on Apple Maps WFD catchment Alfreton Brook from Source to Westwood Brook (GB104028052350) 2024 spills / hours 37 / 393 Long-term average 38.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 948 hours spilling →	Normanton Brook	53	948	up 43%	98%
Alkborough STW Storm tank at sewage works Sewage works Alkborough Company site name ALKBOROUGH STW (SSTO) EA ID / permit SVT00050 · T/81/45466/R Outlet location SE8791922121 (OS grid reference) · View on Apple Maps WFD catchment Humber estuary TRaC (GB530402609203) 2024 spills / hours 67 / 1,235 Long-term average 97.2 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 completed Volume & pollution Estimate from 946 hours spilling →	Tributary of River Humber	57	946	down 15%	100%
Crowle-Scunthorpe STW Storm tank at sewage works Sewage works Crowle Scunthorpe Company site name CROWLE - SCUNTHORPE STW (SSTO) EA ID / permit SVT00693 · T/84/46212/R Outlet location SE7657612587 (OS grid reference) · View on Apple Maps WFD catchment North Soak Drain Catchment (trib of Torne/Three Rivers) (GB104028064350) 2024 spills / hours 216 / 3,582 Long-term average 75.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement UWWTR improvement completed Volume & pollution Estimate from 925 hours spilling →	Tributary of Pauper¿S Drain	51	925	down 76%	99%
Baslow STW Storm tank at sewage works Sewage works Baslow Company site name BASLOW STW (SSTO) EA ID / permit SVT00196 · T/38/45845/R Outlet location SK2534071770 (OS grid reference) · View on Apple Maps WFD catchment Derwent from Westend to Wye (GB104028057880) 2024 spills / hours 116 / 1,317 Long-term average 82.8 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 915 hours spilling →	River Derwent	86	915	down 26%	100%
Ashover STW Inlet overflow at sewage works Sewage works Ashover Company site name ASHOVER STW (CSO) EA ID / permit SVT00130 · T/41/45611/R Outlet location SK3461362880 (OS grid reference) · View on Apple Maps WFD catchment Amber from Source to Press Brook (GB104028052380) 2024 spills / hours 148 / 1,275 Long-term average 115.4 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 completed Volume & pollution Estimate from 911 hours spilling →	River Amber	103	911	down 30%	100%
Pitts Mill Sewage Treatment Works Storm tank at sewage works Sewage works Pitts Mill Company site name PITTS MILL STW (SSTO) EA ID / permit SVT01799 · S/21/26069/R Outlet location SO7850028392 (OS grid reference) · View on Apple Maps WFD catchment Glynch Bk - source to conf R Leadon (GB109054039620) 2024 spills / hours 179 / 3,460 Long-term average 84.4 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation ongoing, Operational investigation completed Improvement UWWTR improvement ongoing, Operational improvement completed Volume & pollution Estimate from 907 hours spilling →	Glynch Brook	51	907	down 72%	93%
Stanley Downton WwTW Storm tank at sewage works Sewage works Stanley Downton Company site name STANLEY DOWNTON (STW) EA ID / permit SVT02163 · S/22/26240/R Outlet location SO7933004970 (OS grid reference) · View on Apple Maps WFD catchment Frome - Ebley Mill to conf R Severn (GB109054032450) 2024 spills / hours 127 / 1,647 Long-term average 67.3 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 907 hours spilling →	River Frome	58	907	down 54%	100%
Ilmington STW Storm tank at sewage works Sewage works Ilmington Company site name ILINGTON STW (SSTO) EA ID / permit SVT01210 · S/14/25976/R Outlet location SP2229044080 (OS grid reference) · View on Apple Maps WFD catchment Stour - conf Nethercote Bk to conf Back Bk (GB109054039922) 2024 spills / hours 111 / 2,164 Long-term average 93.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 903 hours spilling →	Tributary of Back Brook	54	903	down 51%	97%
Ashover STW Storm tank at sewage works Sewage works Ashover Company site name ASHOVER STW (SSTO) EA ID / permit SVT00129 · T/41/45611/R Outlet location SK3461362880 (OS grid reference) · View on Apple Maps WFD catchment Amber from Source to Press Brook (GB104028052380) 2024 spills / hours 0 / 0.0 Long-term average 54.5 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 870 hours spilling →	River Amber	49	870	up from 0	99%
Fenny Compton STW Inlet overflow at sewage works (with treatment) Sewage works Fenny Compton Company site name FENNY COMPTON STW (SSTO) EA ID / permit SVT00891 · S/12/25307/R Outlet location SP4203853138 (OS grid reference) · View on Apple Maps WFD catchment Itchen - source to conf with R Stowe (GB109054044070) Treatment Reed bed 2024 spills / hours 250 / 4,249 Long-term average 104.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Installation set-up/design issue · Scheduled Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 866 hours spilling →	Tributary of the River Itchen	70	866	down 72%	79%
Kegworth STW Storm tank at sewage works Sewage works Kegworth Company site name KEGWORTH STW (SSTO) EA ID / permit SVT01241 · T/59/45410/R Outlet location SK4921727848 (OS grid reference) · View on Apple Maps WFD catchment Soar from Long Whatton Brook to Trent (GB104028047212) 2024 spills / hours 88 / 938 Long-term average 68.4 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 826 hours spilling →	River Soar	58	826	down 34%	100%
Endon Sewage Treatment Works Storm tank at sewage works Sewage works Endon Company site name ENDON STW (SSTO EA ID / permit SVT00866 · T/30/35824/R Outlet location SJ9377354135 (OS grid reference) · View on Apple Maps WFD catchment Endon Bk (GB104028052711) 2024 spills / hours 108 / 553 Long-term average 97.4 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 811 hours spilling →	Endon Brook	83	811	down 23%	99%
Milton Sewage Treatment Works Storm tank at sewage works Sewage works Milton Company site name MILTON STW (SSTO) EA ID / permit SVT01573 · T/36/45730/R Outlet location SK3319227862 (OS grid reference) · View on Apple Maps WFD catchment Trent from Dove to Derwent (GB104028047420) 2024 spills / hours 147 / 1,753 Long-term average 111.3 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 806 hours spilling →	River Trent	76	806	down 48%	100%
Darley Dale No 11 CSO Storm discharge at pumping station Company site name MATLOCK - BAKEWELL RD (HOOLEY TOWN) (SSO) EA ID / permit SVT00740 · EPRKB3593RU Outlet location SK2867360855 (OS grid reference) · View on Apple Maps WFD catchment Derwent from Wye to Amber (GB104028052390) 2024 spills / hours 91 / 818 Long-term average 89.7 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 804 hours spilling →	River Derwent	84	804	down 8%	100%
Colwall Sewage Treatment Works Storm tank at sewage works Sewage works Colwall Company site name COLWALL STW (SSTO) EA ID / permit SVT00621 · S/09/55757/R Outlet location SO7367842954 (OS grid reference) · View on Apple Maps WFD catchment Cradley Bk - source to conf Suckley Bk (GB109054039910) 2024 spills / hours 143 / 1,947 Long-term average 103.4 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 799 hours spilling →	Cradley Brook	81	799	down 43%	100%
Snarrows STW Storm tank at sewage works Sewage works Snarrows Company site name SNARROWS STW (SSTO) EA ID / permit SVT02077 · T/57/46075/R Outlet location SK4344718479 (OS grid reference) · View on Apple Maps WFD catchment Grace Dieu Brook Catchment (trib of Black Brook) (GB104028047090) 2024 spills / hours 104 / 1,276 Long-term average 80.2 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement UWWTR improvement completed Volume & pollution Estimate from 796 hours spilling →	Grace Dieu Brook	66	796	down 37%	99%
Tideswell STW Storm tank at sewage works Sewage works Tideswell Company site name TIDESWELL STW (SSTO) EA ID / permit SVT02324 · T/39/45417/R Outlet location SK1540974474 (OS grid reference) · View on Apple Maps WFD catchment Wye from Monk's Dale to Derwent (GB104028057820) 2024 spills / hours 92 / 837 Long-term average 97.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 772 hours spilling →	Tideswell Brook	68	772	down 26%	100%
Avening Sewage Treatment Works Inlet overflow at sewage works Sewage works Avening Company site name TETBURY - AVENING STW (CSO) EA ID / permit SVT00150 · S/22/26628/R Outlet location ST8787698744 (OS grid reference) · View on Apple Maps WFD catchment Nailsworth Stream - source to conf R Frome (GB109054026531) 2024 spills / hours 154 / 975 Long-term average 135.2 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 759 hours spilling →	Nailsworth Stream	113	759	down 27%	100%
The Post Office CSO Storm discharge at pumping station Company site name ASHFORD - CHURCH ST (POST OFFICE) (CSO) EA ID / permit SVT02300 · T/39/21265/O Outlet location SK1973969647 (OS grid reference) · View on Apple Maps WFD catchment Wye from Monk's Dale to Derwent (GB104028057820) 2024 spills / hours 22 / 155 Long-term average 11.9 spills a year (monitored since 2019) High-spill reason (company) Data collection - EDM non-representative location Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 728 hours spilling →	River Wye	57	728	up 159%	100%
Crowle STW Storm tank at sewage works Sewage works Crowle Company site name CROWLE - WORCESTER (STW) EA ID / permit SVT00694 · S/19/25637/R Outlet location SO9347455685 (OS grid reference) · View on Apple Maps WFD catchment Bow Bk - Shell to conf R Avon (GB109054043712) 2024 spills / hours 143 / 2,487 Long-term average 123.7 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 720 hours spilling →	Bow Brook	56	720	down 61%	99%
Lydney - East Marsh SPS Storm discharge at pumping station Company site name LYDNEY - EAST MARSH (SSO) EA ID / permit SVT00827 · S/20/26052/O Outlet location SO6346802492 (OS grid reference) · View on Apple Maps WFD catchment Cannop Bk - source to R Severn Estuary (GB109054032640) 2024 spills / hours 126 / 1,878 Long-term average 111.4 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation UWWTR investigation completed, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 703 hours spilling →	Tributary of the Lyd	48	703	down 62%	100%

Sewage treatment works

Storm tanks and inlet overflows at each Severn Trent 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.