Storm overflow register · 2025 annual return

Northumbrian Water storm overflows, 2025

Northumbrian Water reported 1,561 storm overflows in England for 2025. Together they recorded 27,860 spills over 123,803 hours, an average of 17.8 spills per overflow against 20.4 across England. That ranks 5 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 32% on 2024.

255 overflows did not spill · 69 spilled more than 60 times · 1,359 had monitors working for 90% of the year or more · 183 sewage treatment works with overflows

Hours spilling by month, 2025

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

All Northumbrian 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
Consett STW Storm tank at sewage works Sewage works Consett EA ID / permit NWL00320 · 234/1061 Outlet location NZ0940255072 (OS grid reference) · View on Apple Maps WFD catchment Derwent from Burnhope Burn to River Tyne (GB103023074790) 2024 spills / hours 67 / 728 Long-term average 100.2 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 305 hours spilling →	River Derwent	46	305	down 31%	100%
The Carrs Tilery Lane CSO Overflow on sewer network EA ID / permit NWL01357 · 25/06/1027 Outlet location NZ6485215974 (OS grid reference) · View on Apple Maps WFD catchment Skelton Beck Catch (Saltburn) trib of North Sea (GB103025071970) 2024 spills / hours 46 / 439 Long-term average 22.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 303 hours spilling →	Tributary Of Little Beck	40	303	down 13%	99%
Dene House SPS Storm discharge at pumping station EA ID / permit NWL00435 · 224/1004 Outlet location NZ2887891276 (OS grid reference) · View on Apple Maps WFD catchment River Lyne (GB650301500001) 2024 spills / hours 45 / 412 Long-term average 39.0 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 302 hours spilling →	River Lyne	38	302	down 16%	100%
Tudor Croft Cottage CSO L017 Overflow on sewer network EA ID / permit NWL01407 · 256/1043 Outlet location NZ6003915452 (OS grid reference) · View on Apple Maps WFD catchment Skelton Beck Catch (Saltburn) trib of North Sea (GB103025071970) 2024 spills / hours 68 / 426 Long-term average 45.8 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 302 hours spilling →	Hutton Beck	59	302	down 13%	100%
Fieldon Bridge CSO Overflow on sewer network EA ID / permit NWL00552 · 242/1041 Outlet location NZ2048226845 (OS grid reference) · View on Apple Maps WFD catchment Gaunless from Hummer Beck to Wear (GB103024072730) 2024 spills / hours 49 / 514 Long-term average 42.8 spills a year (monitored since 2013) Monitor below 90% Comms failure / issue · Resolved - Jun Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 301 hours spilling →	Gaunless	28	301	down 43%	88%
North Blyth SPS Storm discharge at pumping station EA ID / permit NWL00958 · 226/1156 Outlet location NZ3052283146 (OS grid reference) · View on Apple Maps WFD catchment BLYTH (N) (GB510302203200) 2024 spills / hours 105 / 1,778 Long-term average 64.3 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 297 hours spilling →	River Blyth	31	297	down 70%	100%
Bellingham STW Storm tank at sewage works Sewage works Bellingham EA ID / permit NWL00114 · 231/1086 Outlet location NY8372282933 (OS grid reference) · View on Apple Maps WFD catchment N Tyne from Tarset Burn to River Rede (GB103023074960) 2024 spills / hours 91 / 278 Long-term average 121.2 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 289 hours spilling →	River North Tyne	48	289	down 47%	96%
Mordon STW Storm tank at sewage works Sewage works Mordon EA ID / permit NWL00905 · 253/0065 Outlet location NZ3282326298 (OS grid reference) · View on Apple Maps WFD catchment Skerne form Woodham Burn to Demons Beck (GB103025072391) 2024 spills / hours 51 / 576 Long-term average 43.0 spills a year (monitored since 2020) 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 289 hours spilling →	Skerne, A Ditch to	32	289	down 37%	100%
Humshaugh STW Inlet overflow at sewage works Sewage works Humshaugh EA ID / permit NWL00718 · 231/1108 Outlet location NY9216070690 (OS grid reference) · View on Apple Maps WFD catchment N Tyne from Barrasford to S Tyne confluence (GB103023075802) 2024 spills / hours 63 / 321 Long-term average 46.2 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 283 hours spilling →	River North Tyne	56	283	down 11%	100%
Sedgeletch STW Inlet overflow at sewage works Sewage works Sedgeletch EA ID / permit NWL01175 · 245/1243 Outlet location NZ3244050818 (OS grid reference) · View on Apple Maps WFD catchment Lumley Park Burn from Source to Herrington Burn (GB103024077580) 2024 spills / hours 2 / 0.8 Long-term average 23.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 283 hours spilling →	Herrington Burn/Moors Burn	87	283	up 4250%	100%
Barton Sewage Treatment Works Storm tank at sewage works Sewage works Barton EA ID / permit NWL00092 · 25/02/1080 Outlet location NZ2314309135 (OS grid reference) · View on Apple Maps WFD catchment Barton Beck from Source to Clow Beck (GB103025072040) 2024 spills / hours 113 / 743 Long-term average 75.3 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Monitor below 90% Comms failure / issue · Resolved - Sep Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 281 hours spilling →	Barton Beck	37	281	down 67%	89%
Knitsley Sewage Treatment Works Storm tank at sewage works Sewage works Knitsley EA ID / permit NWL00766 · 244/1028 Outlet location NZ1244748118 (OS grid reference) · View on Apple Maps WFD catchment Smallhope Burn from Source to Browney, Stocke (GB103024077330) 2024 spills / hours 54 / 484 Long-term average 45.0 spills a year (monitored since 2021) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 280 hours spilling →	Smallhope Burn	41	280	down 24%	100%
Hendon Preliminary Treatment Works Inlet overflow at sewage works Sewage works Hendon Preliminary Treatment Works EA ID / permit NWL00666 · 245/1213 Outlet location NZ4108056150 (OS grid reference) · View on Apple Maps WFD catchment Tyne and Wear (GB650301500002) 2024 spills / hours 103 / 554 Long-term average 102.2 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 279 hours spilling →	North Sea	70	279	down 32%	100%
Cargo Fleet SPS Storm discharge at pumping station EA ID / permit NWL00245 · 254/1514 Outlet location NZ5150020830 (OS grid reference) · View on Apple Maps WFD catchment TEES (GB510302509900) 2024 spills / hours 104 / 461 Long-term average 88.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 277 hours spilling →	Ormsby Beck	87	277	down 16%	100%
Ingleby Greenhow STW Storm tank at sewage works Sewage works Ingleby Greenhow EA ID / permit NWL00726 · 25/04/1740 Outlet location NZ5788206506 (OS grid reference) · View on Apple Maps WFD catchment Broughton Beck from Source to River Leven (GB103025071870) 2024 spills / hours 37 / 395 Long-term average 53.2 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 275 hours spilling →	Ingleby Beck	33	275	down 11%	100%
Butterknowle CSO 2 Overflow on sewer network EA ID / permit NWL00230 · Permit applied for Outlet location NZ1148325442 (OS grid reference) · View on Apple Maps WFD catchment Gaunless from Source to Hummer Beck (GB103024072690) 2024 spills / hours 62 / 477 Long-term average 62.5 spills a year (monitored since 2020) 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 274 hours spilling →	River Gaunless	60	274	down 3%	91%
Heddon on the Wall STW Storm tank at sewage works Sewage works Heddon On The Wall EA ID / permit NWL00664 · 233/1266 Outlet location NZ1365865567 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 65 / 56 Long-term average 46.0 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Monitor below 90% Telemetry or data archiving failure / issue · Resolved - Feb Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 274 hours spilling →	River Tyne	53	274	down 18%	83%
Carlton & Redmarshall STW Storm tank at sewage works Sewage works Carlton And Redmarshall EA ID / permit NWL00247 · 25/04/1706 Outlet location NZ3849022238 (OS grid reference) · View on Apple Maps WFD catchment Billingham Beck from Bishopton Bck to Brierle (GB103025072360) 2024 spills / hours 54 / 608 Long-term average 51.6 spills a year (monitored since 2020) 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 273 hours spilling →	Whiton Beck	37	273	down 31%	100%
Portrack Sewage Treatment Works Inlet overflow at sewage works Sewage works Portrack EA ID / permit NWL01050 · 25/04/1657 Outlet location NZ4703019380 (OS grid reference) · View on Apple Maps WFD catchment River Tees Estury (GB510302509900) 2024 spills / hours 76 / 401 Long-term average 58.5 spills a year (monitored since 2020) 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 273 hours spilling →	River Tees (Saline Estuary)	58	273	down 24%	100%
Branxton STW Inlet overflow at sewage works Sewage works Branxton EA ID / permit NWL00189 · 210/0039 Outlet location NT8915137910 (OS grid reference) · View on Apple Maps WFD catchment Pallins Burn Catch (trib of Till) (GB102021072990) 2024 spills / hours 57 / 177 Long-term average 46.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 270 hours spilling →	River Till Trib	75	270	up 32%	93%
Clockwood Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL00298 · 25/04/1679 Outlet location NZ4292512583 (OS grid reference) · View on Apple Maps WFD catchment Tees from Skerne to Tidal Limit (GB103025072595) 2024 spills / hours 62 / 683 Long-term average 43.2 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 270 hours spilling →	River Tees	35	270	down 44%	100%
Sacriston Sewage Treatment Works Storm tank at sewage works Sewage works Sacriston EA ID / permit NWL01135 · 245/1254 Outlet location NZ2454047830 (OS grid reference) · View on Apple Maps WFD catchment South Burn to confluence with Wear (GB103024077623) 2024 spills / hours 49 / 464 Long-term average 55.2 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 268 hours spilling →	South Burn	27	268	down 45%	99%
Beechville CSO Overflow on sewer network EA ID / permit NWL00107 · 245/1083 Outlet location NZ2281349486 (OS grid reference) · View on Apple Maps WFD catchment Cong Burn from Source to Twizell Burn (GB103024077560) 2024 spills / hours 42 / 343 Long-term average 48.4 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 267 hours spilling →	Cong Burn	39	267	down 7%	96%
Burnopfield CSO Overflow on sewer network EA ID / permit NWL00221 · 234/1053 Outlet location NZ1750757658 (OS grid reference) · View on Apple Maps WFD catchment Derwent from Burnhope Burn to River Tyne (GB103023074790) 2024 spills / hours 49 / 243 Long-term average 46.1 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 266 hours spilling →	Leapmill Burn	48	266	down 2%	95%
Lakes CSO Overflow on sewer network EA ID / permit NWL00769 · 256/1066 Outlet location NZ6019026030&NZ5983025520 (OS grid reference) · View on Apple Maps WFD catchment Tees Coastal (GB650301500005) Bathing water Redcar Coatham 2024 spills / hours 51 / 301 Long-term average 48.6 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Sensor failure / issue · Resolved - May Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 263 hours spilling →	North Sea	46	263	down 10%	77%
Worsall Road SPS Storm discharge at pumping station EA ID / permit NWL01558 · 25/04/1648 Outlet location NZ4174512250 (OS grid reference) · View on Apple Maps WFD catchment Tees from Skerne to Tidal Limit (GB103025072595) 2024 spills / hours 48 / 660 Long-term average 32.0 spills a year (monitored since 2020) Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 259 hours spilling →	Skytering Beck (R.Tees Catch)	27	259	down 44%	100%
Thropton and Snitter STW Storm tank at sewage works Sewage works Thropton And Snitter EA ID / permit NWL01381 · 223/0943 Outlet location NU0279102734 (OS grid reference) · View on Apple Maps WFD catchment Wreigh Burn from Netherton Burn to Coquet (GB103022076601) 2024 spills / hours 45 / 340 Long-term average 40.8 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 259 hours spilling →	Wreigh Burn	34	259	down 24%	100%
Spillers Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL01251 · 235/1760 Outlet location NZ2678463743 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 4 / 21 Long-term average 44.0 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 255 hours spilling →	River Tyne Saline Estuary	57	255	up 1325%	100%
Sea View CSO Overflow on sewer network EA ID / permit NWL01160 · 224/0994 Outlet location NZ2979191095 (OS grid reference) · View on Apple Maps WFD catchment River Lyne (GB650301500001) 2024 spills / hours 46 / 311 Long-term average 61.5 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 249 hours spilling →	River Lyne	45	249	down 2%	99%
South Shore Road CSO Overflow on sewer network EA ID / permit NWL01239 · 235/1661 Outlet location NZ2653363864 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 92 / 345 Long-term average 54.2 spills a year (monitored since 2013) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 248 hours spilling →	Tyne Saline Estuary	86	248	down 7%	97%
Trimdon Village STW Storm tank at sewage works Sewage works Trimdon Village EA ID / permit NWL01403 · 25/03/1232 Outlet location NZ3760334523 (OS grid reference) · View on Apple Maps WFD catchment Skerne from Source to Carrs (GB103025076070) 2024 spills / hours 38 / 419 Long-term average 44.8 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 247 hours spilling →	River Skerne	30	247	down 21%	100%
Lanchester STW Storm tank at sewage works Sewage works Lanchester EA ID / permit NWL00773 · 244/0986 Outlet location NZ1735846588 (OS grid reference) · View on Apple Maps WFD catchment Smallhope Burn from Source to Browney, Stocke (GB103024077330) 2024 spills / hours 77 / 961 Long-term average 70.0 spills a year (monitored since 2020) 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 247 hours spilling →	Smallhope Burn	37	247	down 52%	99%
Broad Chare CSO Overflow on sewer network EA ID / permit NWL00201 · 235/1919 Outlet location NZ2551163934 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 89 / 838 Long-term average 80.0 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Sensor failure / issue · Not Applicable - Ongoing investigation Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 247 hours spilling →	Tyne Estuary	43	247	down 52%	40%
Jackson Avenue CSO Overflow on sewer network EA ID / permit NWL00731 · NPSWQD010337 Outlet location NZ1675673430 (OS grid reference) · View on Apple Maps WFD catchment Pont from Med Burn to Small Burn (GB103022076860) 2024 spills / hours 51 / 328 Long-term average 38.9 spills a year (monitored since 2016) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 244 hours spilling →	River Pont	38	244	down 25%	100%
Amble Harbour SPS Storm discharge at pumping station EA ID / permit NWL00048 · 223/0933 Outlet location NU2688904821 (OS grid reference) · View on Apple Maps WFD catchment COQUET (GB510302203000) Bathing water Warkworth; Amble Links 2024 spills / hours 29 / 172 Long-term average 27.3 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 242 hours spilling →	River Coquet	31	242	up 7%	98%
Crookhall STW Storm tank at sewage works Sewage works Crookhall EA ID / permit NWL00352 · 244/1006 Outlet location NZ1257950442 (OS grid reference) · View on Apple Maps WFD catchment Smallhope Burn from Source to Browney, Stocke (GB103024077330) 2024 spills / hours 70 / 566 Long-term average 49.3 spills a year (monitored since 2023) 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 240 hours spilling →	Stockerley Burn, Tributary of	33	240	down 53%	99%
Cresswell Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL00346 · 224/0986 Outlet location NZ2978193771 (OS grid reference) · View on Apple Maps WFD catchment Northumberland South (GB650301500001) 2024 spills / hours 25 / 142 Long-term average 16.3 spills a year (monitored since 2018) High-spill reason (company) Not Applicable - Ongoing investigation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 237 hours spilling →	North Sea	31	237	up 24%	100%
Shiney Row Footbridge CSO Overflow on sewer network EA ID / permit NWL01197 · 245/1368 Outlet location NZ3288752353 (OS grid reference) · View on Apple Maps WFD catchment Herrington Burn from Source to Lumley Park Burn (GB103024077630) 2024 spills / hours 48 / 177 Long-term average 31.1 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 236 hours spilling →	Herrington Burn	46	236	down 4%	100%
Seaton Carew Sewage Treatment Works Inlet overflow at sewage works Sewage works Seaton Carew EA ID / permit NWL01170 · 254/1966 Outlet location NZ5580032100&NZ5350030100 (OS grid reference) · View on Apple Maps WFD catchment Tees Coastal (GB650301500005) Bathing water Seaton Carew North 2024 spills / hours 85 / 314 Long-term average 81.3 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 235 hours spilling →	North Sea	68	235	down 20%	100%
West Sleekburn Farm CSO Overflow on sewer network EA ID / permit NWL01493 · 226/1048 Outlet location NZ2737784104 (OS grid reference) · View on Apple Maps WFD catchment Sleek Burn / Hepscott Burn Source to Tidal Limit (GB103022076230) 2024 spills / hours 50 / 468 Long-term average 33.4 spills a year (monitored since 2013) Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 232 hours spilling →	Sleek Burn	30	232	down 40%	95%
Berwick-Upon-Tweed STW Storm tank at sewage works Sewage works Berwick Upon Tweed EA ID / permit NWL00125 · 210/1273 Outlet location NT9798552457 (OS grid reference) · View on Apple Maps WFD catchment TWEED (GB510202110000) Bathing water Spittal 2024 spills / hours 64 / 62 Long-term average 37.3 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 228 hours spilling →	River Tweed	39	228	down 39%	99%
Memorial Hall SSO Overflow on sewer network EA ID / permit NWL00868 · 226/0100 Outlet location NZ1638772732 (OS grid reference) · View on Apple Maps WFD catchment Pont from Med Burn to Small Burn (GB103022076860) 2024 spills / hours 73 / 565 Long-term average 53.7 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 223 hours spilling →	Pont	48	223	down 34%	91%
Finchale View CSO Overflow on sewer network EA ID / permit NWL00554 · 245/1294 Outlet location NZ3011646522 (OS grid reference) · View on Apple Maps WFD catchment Wear from Croxdale Beck to Lumley Park Burn (GB103024077621) 2024 spills / hours 52 / 247 Long-term average 49.4 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 220 hours spilling →	Wear Tributary	39	220	down 25%	100%
Furness PS Outfall Storm discharge at pumping station EA ID / permit NWL00577 · QR.25/04/1543 Outlet location NZ4904022020 (OS grid reference) · View on Apple Maps WFD catchment TEES (GB510302509900) 2024 spills / hours 39 / 550 Long-term average 24.8 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 219 hours spilling →	The River Tees-Saline Estuary	22	219	down 44%	100%
Craster South SPS Storm discharge at pumping station EA ID / permit NWL00343 · 221/0920 Outlet location NU2596919513 (OS grid reference) · View on Apple Maps WFD catchment Northumberland South (GB650301500001) 2024 spills / hours 73 / 246 Long-term average 75.4 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 217 hours spilling →	The North Sea	61	217	down 16%	99%
Port Clarence East Pumping Station Storm discharge at pumping station EA ID / permit NWL01048 · 254/1948 Outlet location NZ5016221387 (OS grid reference) · View on Apple Maps WFD catchment TEES (GB510302509900) 2024 spills / hours 0 / 0.0 Long-term average 35.2 spills a year (monitored since 2013) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 217 hours spilling →	River Tees (Saline Estuary)	30	217	up from 0	94%
Nunthorpe No 1 SPS Storm discharge at pumping station EA ID / permit NWL00969 · 25/04/1621 Outlet location NZ5318413831 (OS grid reference) · View on Apple Maps WFD catchment Marton West Beck Catchment (trib of Tidal Tees) (GB103025072210) 2024 spills / hours 35 / 416 Long-term average 27.2 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 215 hours spilling →	Trib of Marton West Beck	20	215	down 43%	100%
Ramshaw Sewage Treatment Works Storm tank at sewage works Sewage works Ramshaw EA ID / permit NWL01084 · 242/1071 Outlet location NZ1532425947 (OS grid reference) · View on Apple Maps WFD catchment Gaunless from Source to Hummer Beck (GB103024072690) 2024 spills / hours 6 / 64 Long-term average 23.0 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 213 hours spilling →	Gaunless	34	213	up 467%	100%
Cockfield STW Storm tank at sewage works Sewage works Cockfield EA ID / permit NWL00306 · 242/1052 Outlet location NZ1363224900 (OS grid reference) · View on Apple Maps WFD catchment Gaunless from Source to Hummer Beck (GB103024072690) 2024 spills / hours 41 / 509 Long-term average 46.0 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 210 hours spilling →	Gaunless	22	210	down 46%	100%
Gunnerton STW Inlet overflow at sewage works Sewage works Gunnerton EA ID / permit NWL00632 · 231/1078 Outlet location NY9042074970 (OS grid reference) · View on Apple Maps WFD catchment Gunnerton Burn from Source to N Tyne (GB103023074880) 2024 spills / hours 69 / 218 Long-term average 64.5 spills a year (monitored since 2024) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 208 hours spilling →	Gunnerton Burn	60	208	down 13%	96%

Sewage treatment works

Storm tanks and inlet overflows at each Northumbrian 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.