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
South Shields Interceptor Bs/104 Overflow on sewer network EA ID / permit NWL01238 · 235/B/0170 Outlet location NZ3343764674 (OS grid reference) · View on Apple Maps WFD catchment Don from Source to Tidal Limit (GB103023075690) 2024 spills / hours 108 / 871 Long-term average 92.6 spills a year (monitored since 2018) 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 467 hours spilling →	River Don	90	467	down 17%	100%
Wolsingham STW Storm tank at sewage works Sewage works Wolsingham EA ID / permit NWL01540 · 241/1102 Outlet location NZ1066035647 (OS grid reference) · View on Apple Maps WFD catchment Wear from Houselop Beck to Beechburn Beck (GB103024077462) 2024 spills / hours 47 / 424 Long-term average 58.3 spills a year (monitored since 2023) 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 460 hours spilling →	River Wear	44	460	down 6%	100%
Sunnybrow Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL01331 · 243/D/0395 Outlet location NZ1972033898 (OS grid reference) · View on Apple Maps WFD catchment Wear from Gaunless to Browney (GB103024077464) 2024 spills / hours 72 / 595 Long-term average 63.7 spills a year (monitored since 2013) High-spill reason (company) Performance - Partial / no capacity due to blockage or restriction (e.g. roots / grid) - maintenance issue Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 460 hours spilling →	Holy Well Burn	58	460	down 19%	95%
Christon Bank SPS Storm discharge at pumping station EA ID / permit NWL00283 · 221/1030 Outlet location NU2105123285 (OS grid reference) · View on Apple Maps WFD catchment Brunton burn from Source to N Sea (GB103022076400) 2024 spills / hours 69 / 543 Long-term average 49.0 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 458 hours spilling →	Brunton Burn	58	458	down 16%	100%
Raf Boulmer Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL01076 · 221/1036 Outlet location NU2679715663 (OS grid reference) · View on Apple Maps WFD catchment Northumberland South (GB650301500001) 2024 spills / hours 45 / 705 Long-term average 36.7 spills a year (monitored since 2020) Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 454 hours spilling →	North Sea	29	454	down 36%	100%
Togston Sewage Treatment Works Inlet overflow at sewage works Sewage works Togston EA ID / permit NWL01390 · 224/0992 Outlet location NU2501001480 (OS grid reference) · View on Apple Maps WFD catchment Lady Burn to north Sea (GB650301500001) 2024 spills / hours 56 / 535 Long-term average 75.7 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement Operational improvement completed Volume & pollution Estimate from 446 hours spilling →	Lady Burn	56	446	no change	100%
Cambois Sewage Treatment Works Inlet overflow at sewage works Sewage works Cambois EA ID / permit NWL00241 · 226/1119 Outlet location NZ3283084320 (OS grid reference) · View on Apple Maps WFD catchment Tyne and Wear (GB650301500002) 2024 spills / hours 102 / 673 Long-term average 72.8 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 432 hours spilling →	The North Sea	72	432	down 29%	100%
Wark Sewage Treatment Works Storm tank at sewage works Sewage works Wark EA ID / permit NWL01454 · 231/1071 Outlet location NY8626976666 (OS grid reference) · View on Apple Maps WFD catchment N Tyne from Rede to Gunnerton Burn (GB103023074920) 2024 spills / hours 48 / 272 Long-term average 33.0 spills a year (monitored since 2020) High-spill reason (company) Performance - Other maintenance / capital works (e.g. jetting) Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 424 hours spilling →	River North Tyne	46	424	down 4%	100%
New Moors Sewage Treatment Works Storm tank at sewage works Sewage works New Moors EA ID / permit NWL00934 · 242/A/0706 Outlet location NZ1694824152 (OS grid reference) · View on Apple Maps WFD catchment Hummer Beck from Source to Gaunless (GB103024072680) 2024 spills / hours 86 / 852 Long-term average 89.8 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 422 hours spilling →	Hummer Beck	55	422	down 36%	99%
Leamside Sewage Treatment Works Storm tank at sewage works Sewage works Leamside EA ID / permit NWL01490 · 245/1271 Outlet location NZ2971146647 (OS grid reference) · View on Apple Maps WFD catchment Wear from Croxdale Beck to Lumley Park Burn (GB103024077621) 2024 spills / hours 10 / 123 Long-term average 38.8 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Installation set-up/design issue · Resolved - May Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 417 hours spilling →	River Wear	37	417	up 270%	61%
Swarland Fence Pumping Station Storm discharge at pumping station EA ID / permit NWL01334 · 223/0839 Outlet location NU1569101257 (OS grid reference) · View on Apple Maps WFD catchment Swarland Burn Catchment (trib of Coquet) (GB103022076660) 2024 spills / hours 107 / 678 Long-term average 84.7 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 Operational improvement ongoing Volume & pollution Estimate from 416 hours spilling →	Fence Burn	64	416	down 40%	100%
Peases West CSO Overflow on sewer network EA ID / permit NWL01017 · 241/1083 Outlet location NZ1630636236 (OS grid reference) · View on Apple Maps WFD catchment Beechburn Beck (Trib of Wear) (GB103024077390) 2024 spills / hours 47 / 357 Long-term average 45.7 spills a year (monitored since 2013) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 411 hours spilling →	Crook Beck	48	411	up 2%	98%
Lanehead STW Inlet overflow at sewage works Sewage works Lanehead EA ID / permit NWL00775 · 231/0922 Outlet location NY7880585879 (OS grid reference) · View on Apple Maps WFD catchment Tarset Burn from Black Burn to N Tyne (GB103023074991) 2024 spills / hours 49 / 84 Long-term average 28.0 spills a year (monitored since 2022) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement Operational improvement completed Volume & pollution Estimate from 408 hours spilling →	Tarset Burn	63	408	up 29%	100%
Witton Gilbert STW Storm tank at sewage works Sewage works Witton Gilbert EA ID / permit NWL01537 · 244/1027 Outlet location NZ2328045067 (OS grid reference) · View on Apple Maps WFD catchment Browney from Smallhope Burn Deerness confl (GB103024077551) 2024 spills / hours 47 / 670 Long-term average 34.7 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 399 hours spilling →	River Browney	37	399	down 21%	99%
Brancepeth Sewage Treatment Works Storm tank at sewage works Sewage works Brancepeth EA ID / permit NWL00186 · 243/1024 Outlet location NZ2253037511 (OS grid reference) · View on Apple Maps WFD catchment Brancepeth Beck from Source to Wear (GB103024077420) 2024 spills / hours 46 / 481 Long-term average 70.7 spills a year (monitored since 2020) 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 395 hours spilling →	Brancepeth Beck	44	395	down 4%	99%
Boulmer Sewage Treatment Works Inlet overflow at sewage works Sewage works Boulmer EA ID / permit NWL00174 · 221/1035 Outlet location NU2680015660 (OS grid reference) · View on Apple Maps WFD catchment Northumberland South (GB650301500001) 2024 spills / hours 54 / 509 Long-term average 54.7 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 394 hours spilling →	North Sea	43	394	down 20%	100%
Lowick Sewage Treatment Works Storm tank at sewage works Sewage works Lowick EA ID / permit NWL00822 · 210/A/0854 Outlet location NU0256239690 (OS grid reference) · View on Apple Maps WFD catchment South Low from Source to Haggerston Bridge (GB103021073221) 2024 spills / hours 48 / 387 Long-term average 41.5 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 392 hours spilling →	Tributary of the Low	52	392	up 8%	100%
Newbiggin Sewage Treatment Works Inlet overflow at sewage works Sewage works Newbiggin EA ID / permit NWL00941 · 225/1031 Outlet location NZ3129786715 (OS grid reference) · View on Apple Maps WFD catchment Tyne and Wear (GB650301500002) Bathing water Newbiggin North; Newbiggin South 2024 spills / hours 8 / 90 Long-term average 51.3 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 387 hours spilling →	North Sea	61	387	up 663%	100%
Chester Le Street STW Storm tank at sewage works Sewage works Chester Le Street EA ID / permit NWL00276 · 245/1242 Outlet location NZ2805051740 (OS grid reference) · View on Apple Maps WFD catchment Wear DS of Lumley Park Burn to Tidal Limit (GB103024077624) 2024 spills / hours 49 / 525 Long-term average 51.6 spills a year (monitored since 2021) 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 387 hours spilling →	Wear	32	387	down 35%	100%
Lanehead Pumping Station Storm discharge at pumping station EA ID / permit NWL00774 · 223/0840 Outlet location NU1733002340 (OS grid reference) · View on Apple Maps WFD catchment Coquet from Forest Burn to Tidal Limit (GB103022076693) 2024 spills / hours 57 / 673 Long-term average 48.0 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 Operational improvement ongoing Volume & pollution Estimate from 385 hours spilling →	East House Burn	31	385	down 46%	100%
Blyth (New) Sewage Treatment Works Storm tank at sewage works Sewage works Blyth Company site name BLYTH SEWAGE TREATMENT WORKS EA ID / permit NWL00162 · 226/1179 Outlet location NZ2948982336 (OS grid reference) · View on Apple Maps WFD catchment BLYTH (N) (GB510302203200) 2024 spills / hours 59 / 875 Long-term average 68.3 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 380 hours spilling →	River Blyth (Saline Estuary)	31	380	down 47%	98%
Portrack Sewage Treatment Works Storm tank at sewage works Sewage works Portrack EA ID / permit NWL01051 · 25/04/1657 Outlet location NZ4703019380 (OS grid reference) · View on Apple Maps WFD catchment River Tees Estury (GB510302509900) 2024 spills / hours 75 / 597 Long-term average 59.7 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 378 hours spilling →	River Tees (Saline Estuary)	52	378	down 31%	100%
St Marys Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL01266 · EPRBB3597VK Outlet location NZ1844580297 (OS grid reference) · View on Apple Maps WFD catchment Duddo Burn from Source to Blyth (GB103022076220) 2024 spills / hours 38 / 506 Long-term average 30.2 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 377 hours spilling →	Duddo Burn	29	377	down 24%	100%
Scemerston No. 2 SPS Storm discharge at pumping station EA ID / permit NWL01157 · EPRTB3996RM Outlet location NU0228749514&NU0236149575 (OS grid reference) · View on Apple Maps WFD catchment Northumberland North (GB650301440000) 2024 spills / hours 102 / 879 Long-term average 67.3 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 376 hours spilling →	The North Sea	44	376	down 57%	100%
Willington STW Storm tank at sewage works Sewage works Willington EA ID / permit NWL01527 · 243/0968 Outlet location NZ2108234458 (OS grid reference) · View on Apple Maps WFD catchment Wear from Gaunless to Browney (GB103024077464) 2024 spills / hours 49 / 704 Long-term average 51.3 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 No improvement action in reporting period Volume & pollution Estimate from 376 hours spilling →	River Wear	37	376	down 24%	100%
Tudhoe Mill Sewage Treatment Works Storm tank at sewage works Sewage works Tudhoe Mill EA ID / permit NWL01406 · 243/0985 Outlet location NZ2422735898 (OS grid reference) · View on Apple Maps WFD catchment Wear from Gaunless to Browney (GB103024077464) 2024 spills / hours 63 / 657 Long-term average 65.0 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 375 hours spilling →	Valley Burn	46	375	down 27%	100%
Grays Road CSO Overflow on sewer network EA ID / permit NWL00610 · 25/04/1628 Outlet location NZ4348319360 (OS grid reference) · View on Apple Maps WFD catchment Lustrum Beck Catchment (trib of Tees) (GB103025072550) 2024 spills / hours 68 / 645 Long-term average 68.6 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement Operational improvement completed Volume & pollution Estimate from 369 hours spilling →	Lustrum Beck	37	369	down 46%	92%
Market Lane CSO Overflow on sewer network EA ID / permit NWL00852 · 234/0934 Outlet location NZ2042062947 (OS grid reference) · View on Apple Maps WFD catchment River Derwent (GB510302310200) 2024 spills / hours 66 / 472 Long-term average 68.3 spills a year (monitored since 2020) High-spill reason (company) Data collection - Tidal / river inundation Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 368 hours spilling →	River Derwent	76	368	up 15%	100%
Hamsterley STW Storm tank at sewage works Sewage works Hamsterley EA ID / permit NWL00644 · 241/1147 Outlet location NZ1214030660 (OS grid reference) · View on Apple Maps WFD catchment Linburn Beck from Source to Wear (GB103024072720) 2024 spills / hours 88 / 513 Long-term average 59.6 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 No improvement action in reporting period Volume & pollution Estimate from 365 hours spilling →	Linburn Beck	97	365	up 10%	100%
Alnwick STW Storm tank at sewage works Sewage works Alnwick EA ID / permit NWL00044 · 222/0862 Outlet location NU2039913200 (OS grid reference) · View on Apple Maps WFD catchment Aln from Edlingham Burn to Tidal Limit (GB103022076350) 2024 spills / hours 78 / 637 Long-term average 57.4 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 365 hours spilling →	River Aln	58	365	down 26%	100%
Haltwhistle STW Storm tank at sewage works Sewage works Haltwhistle EA ID / permit NWL00640 · 232/1098 Outlet location NY7159063720 (OS grid reference) · View on Apple Maps WFD catchment Haltwhistle Burn from Source to South Tyne (GB103023075570) 2024 spills / hours 66 / 514 Long-term average 60.3 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 359 hours spilling →	South Tyne / Haltwhistle Burn	48	359	down 27%	100%
Shilbottle STW Storm tank at sewage works Sewage works Shilbottle EA ID / permit NWL01192 · 223/0991 Outlet location NU2166408509 (OS grid reference) · View on Apple Maps WFD catchment Tyelaw Burn Catchment (trib of Coquet) (GB103022076720) 2024 spills / hours 142 / 2,153 Long-term average 91.6 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 347 hours spilling →	Tyelaw Burn	74	347	down 48%	100%
Snowdons Farm CSO Overflow on sewer network EA ID / permit NWL01217 · 244/1000 Outlet location NZ2586040040 (OS grid reference) · View on Apple Maps WFD catchment Browney from Deerness confl to Wear (GB103024077552) 2024 spills / hours 46 / 598 Long-term average 45.0 spills a year (monitored since 2023) 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 347 hours spilling →	River Browney	36	347	down 22%	100%
Fenwick (Berwick) STW Inlet overflow at sewage works Sewage works Fenwick EA ID / permit NWL00545 · 221/0968 Outlet location NU0683240072 (OS grid reference) · View on Apple Maps WFD catchment Fenham Burn Catchment (to N Sea) (GB103022076490) 2024 spills / hours 129 / 1,080 Long-term average 76.0 spills a year (monitored since 2021) 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 346 hours spilling →	Fenwick Burn	77	346	down 40%	99%
Barkers Haugh STW Storm tank at sewage works Sewage works Barkers Haugh EA ID / permit NWL00085 · 245/1245 Outlet location NZ2807743394 (OS grid reference) · View on Apple Maps WFD catchment Wear from Croxdale Beck to Lumley Park Burn (GB103024077621) 2024 spills / hours 55 / 640 Long-term average 63.3 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 344 hours spilling →	Wear	41	344	down 25%	100%
Skinningrove Sewage Pumping Station Storm discharge at pumping station Company site name SKINNINGROVE SEWAGE PUMPING STATION 1 EA ID / permit NWL01206 · 25/06/1033 Outlet location NZ7132020110 (OS grid reference) · View on Apple Maps WFD catchment Kilton Beck from Middle Gill Beck to North Sea (GB103025071950) 2024 spills / hours 74 / 502 Long-term average 63.0 spills a year (monitored since 2024) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 342 hours spilling →	North Sea	52	342	down 30%	100%
Bates Colliery SPS Storm discharge at pumping station EA ID / permit NWL00094 · 226/1178 Outlet location NZ3051282519 (OS grid reference) · View on Apple Maps WFD catchment BLYTH (N) (GB510302203200) 2024 spills / hours 65 / 638 Long-term average 47.7 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 342 hours spilling →	River Blyth (Saline Estuary)	39	342	down 40%	100%
Billingham STW Inlet overflow at sewage works Sewage works Billingham EA ID / permit NWL00128 · 254/1965 Outlet location NZ4846025840 (OS grid reference) · View on Apple Maps WFD catchment Tees (GB510302509900) 2024 spills / hours 56 / 127 Long-term average 56.3 spills a year (monitored since 2022) 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 339 hours spilling →	North Sea	71	339	up 27%	100%
Tow Law STW Inlet overflow at sewage works Sewage works Tow Law EA ID / permit NWL01395 · 241/1106 Outlet location NZ1135638568 (OS grid reference) · View on Apple Maps WFD catchment Houselop Beck from Source to Wear (GB103024077450) 2024 spills / hours 79 / 396 Long-term average 68.3 spills a year (monitored since 2013) 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 335 hours spilling →	Heatherley Clough	76	335	down 4%	99%
Tyneside CSO B5/201 Overflow on sewer network EA ID / permit NWL01419 · 235/B/0168 Outlet location NZ3351164888 (OS grid reference) · View on Apple Maps WFD catchment Don from Source to Tidal Limit (GB103023075690) 2024 spills / hours 89 / 690 Long-term average 66.8 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 Operational improvement ongoing Volume & pollution Estimate from 334 hours spilling →	River Don	63	334	down 29%	100%
Mickleton Sewage Treatment Works Storm tank at sewage works Sewage works Mickleton EA ID / permit NWL00873 · 251/0940 Outlet location NY9740223910 (OS grid reference) · View on Apple Maps WFD catchment Tees from Maize Beck to Percy Beck (GB103025072511) 2024 spills / hours 72 / 466 Long-term average 64.7 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Sensor failure / issue · Resolved - Nov Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 333 hours spilling →	Heugh Syke - Trib. of R. Tees	37	333	down 49%	38%
Bladeside CSO Overflow on sewer network EA ID / permit NWL00150 · 241/1098 Outlet location NZ1674335319 (OS grid reference) · View on Apple Maps WFD catchment Beechburn Beck (Trib of Wear) (GB103024077390) 2024 spills / hours 69 / 485 Long-term average 64.6 spills a year (monitored since 2013) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 330 hours spilling →	Crook Beck	54	330	down 22%	97%
Park Head Storage Tank CSO Overflow on sewer network EA ID / permit NWL01007 · 242/1044 Outlet location NZ2300030510 (OS grid reference) · View on Apple Maps WFD catchment Gaunless from Hummer Beck to Wear (GB103024072730) 2024 spills / hours – / – Long-term average 18.1 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Installation set-up/design issue · Resolved - Feb Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 324 hours spilling →	Coundon Burn	35	324		80%
Whittingham STW Storm tank at sewage works Sewage works Whittingham EA ID / permit NWL01519 · 222/0864 Outlet location NU0715312081 (OS grid reference) · View on Apple Maps WFD catchment Aln from Callaly Burn to Coe Burn (GB103022076310) 2024 spills / hours 78 / 704 Long-term average 51.0 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 Operational improvement ongoing Volume & pollution Estimate from 324 hours spilling →	River Aln	49	324	down 37%	97%
Bran Sands Ww Treatment Works Inlet overflow at sewage works Sewage works Bran Sands Ww Treatment Works EA ID / permit NWL00184 · 254/1920 Outlet location NZ5614024090 (OS grid reference) · View on Apple Maps WFD catchment Tees Estuary (S Bank) (GB103025072320) 2024 spills / hours 102 / 542 Long-term average 101.0 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 322 hours spilling →	Dabholm Gut	70	322	down 31%	100%
East Tanfield STW Inlet overflow at sewage works Sewage works East Tanfield EA ID / permit NWL00487 · 235/1871 Outlet location NZ1946054891 (OS grid reference) · View on Apple Maps WFD catchment Team from Source to Tyne (GB103023075670) 2024 spills / hours 88 / 583 Long-term average 93.6 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 321 hours spilling →	Causey Burn	78	321	down 11%	100%
Lynemouth STW Storm tank at sewage works Sewage works Lynemouth EA ID / permit NWL00829 · 224/0993 Outlet location NZ3007890898 (OS grid reference) · View on Apple Maps WFD catchment Northumberland South (GB650301500001) 2024 spills / hours 54 / 487 Long-term average 85.5 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 320 hours spilling →	R Lyne (Saline Estuary)	28	320	down 48%	100%
Hexham Sewage Treatment Works Storm tank at sewage works Sewage works Hexham EA ID / permit NWL00677 · 233/1281 Outlet location NY9487664124 (OS grid reference) · View on Apple Maps WFD catchment Tyne from Watersmeet to Tidal Limit (GB103023075801) 2024 spills / hours 78 / 688 Long-term average 74.0 spills a year (monitored since 2020) 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 317 hours spilling →	River Tyne	43	317	down 45%	100%
John Street CSO Overflow on sewer network EA ID / permit NWL00738 · 226/1058 Outlet location NZ2960382326 (OS grid reference) · View on Apple Maps WFD catchment River Blyth (GB510302203200) 2024 spills / hours 114 / 943 Long-term average 106.3 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 311 hours spilling →	Blyth Estuary	55	311	down 52%	96%
Aldin Grange (North) STW Storm tank at sewage works Sewage works Aldin Grange EA ID / permit NWL00101 · 244/0991 Outlet location NZ2489943189 (OS grid reference) · View on Apple Maps WFD catchment Browney from Smallhope Burn Deerness confl (GB103024077551) 2024 spills / hours 45 / 380 Long-term average 60.3 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 305 hours spilling →	River Browney	40	305	down 11%	100%

Sewage treatment works

Storm tanks and inlet overflows at each Northumbrian Water sewage works. The figures are 2025 spills.

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