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
Cotherstone STW Inlet overflow at sewage works Sewage works Cotherstone EA ID / permit NWL00332 · 25/01/0920 Outlet location NZ0071020010 (OS grid reference) · View on Apple Maps WFD catchment Balder Catchment (trib of Tees) (GB103025072240) 2024 spills / hours 228 / 4,350 Long-term average 204.0 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 2,197 hours spilling →	River Balder	161	2,197	down 29%	100%
Allendale STW Storm tank at sewage works Sewage works Allendale EA ID / permit NWL00034 · 232/1118 Outlet location NY8278557056 (OS grid reference) · View on Apple Maps WFD catchment Allen from Source to West Allen (GB103023074710) 2024 spills / hours 202 / 3,981 Long-term average 145.7 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 1,865 hours spilling →	River East Allen	106	1,865	down 48%	98%
Western Area STW Storm tank at sewage works Sewage works Western Area EA ID / permit NWL01501 · 241/1146 Outlet location NY9241337903 (OS grid reference) · View on Apple Maps WFD catchment Wear from Middlehope Burn to Houselop Beck (GB103024077461) 2024 spills / hours 135 / 2,060 Long-term average 100.2 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 1,822 hours spilling →	River Wear	107	1,822	down 21%	100%
Otterburn STW Storm tank at sewage works Sewage works Otterburn EA ID / permit NWL00987 · 231/1087 Outlet location NY8911592613 (OS grid reference) · View on Apple Maps WFD catchment Rede from Bellshiel Burn to N Tyne (GB103023075320) 2024 spills / hours 88 / 1,229 Long-term average 109.3 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 1,816 hours spilling →	River Rede	120	1,816	up 36%	100%
Felton STW Storm tank at sewage works Sewage works Felton EA ID / permit NWL00544 · 223/0993 Outlet location NU1912800567&NU1915300559 (OS grid reference) · View on Apple Maps WFD catchment Coquet from Forest Burn to Tidal Limit (GB103022076693) 2024 spills / hours 216 / 3,692 Long-term average 132.8 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 1,454 hours spilling →	Coquet	109	1,454	down 50%	97%
Glasshouse Street PS Storm discharge at pumping station EA ID / permit NWL00592 · 235/1767 Outlet location NZ2713563481 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 180 / 2,019 Long-term average 145.3 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 1,353 hours spilling →	River Tyne, North Sea	128	1,353	down 29%	96%
Graythorp STW Inlet overflow at sewage works Sewage works Graythorp EA ID / permit NWL00612 · 25/04/1758 Outlet location NZ5228926460 (OS grid reference) · View on Apple Maps WFD catchment TEES (GB510302509900) 2024 spills / hours 136 / 1,932 Long-term average 134.3 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 1,349 hours spilling →	Greatham Creek/Seaton Channel	94	1,349	down 31%	97%
Howdon STW Inlet overflow at sewage works Sewage works Howdon EA ID / permit NWL00714 · 235/1695 Outlet location NZ3370066130 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 214 / 2,523 Long-term average 173.0 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 1,238 hours spilling →	River Tyne Saline Estuary	120	1,238	down 44%	100%
Swainby STW Storm tank at sewage works Sewage works Swainby EA ID / permit NWL01333 · 254/1962 Outlet location NZ4777902920 (OS grid reference) · View on Apple Maps WFD catchment Potto Beck Catchment (trib of Leven) (GB103025071850) 2024 spills / hours 79 / 916 Long-term average 37.6 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 1,236 hours spilling →	Potto Beck	72	1,236	down 9%	100%
Milfield Sewage Treatment Works Storm tank at sewage works Sewage works Milfield EA ID / permit NWL00881 · 210/1327 Outlet location NT9388034340 (OS grid reference) · View on Apple Maps WFD catchment Till from Glen to River Tweed (GB102021073050) 2024 spills / hours 261 / 5,365 Long-term average 172.0 spills a year (monitored since 2024) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 1,193 hours spilling →	Unnamed Trib River Till	83	1,193	down 68%	99%
Wagonway Road SPS Storm discharge at pumping station EA ID / permit NWL01442 · 235/1745 Outlet location NZ3153065824 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 179 / 2,946 Long-term average 145.8 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 1,085 hours spilling →	River Tyne Saline Estuary	100	1,085	down 44%	100%
Butterknowle Sewage Treatment Works Storm tank at sewage works Sewage works Butterknowle EA ID / permit NWL00231 · 242/1070 Outlet location NZ1178325593 (OS grid reference) · View on Apple Maps WFD catchment Gaunless from Source to Hummer Beck (GB103024072690) 2024 spills / hours 130 / 1,688 Long-term average 108.8 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 1,066 hours spilling →	Gaunless	82	1,066	down 37%	99%
Tow Law STW Storm tank at sewage works Sewage works Tow Law EA ID / permit NWL01396 · 241/1106 Outlet location NZ1135638568 (OS grid reference) · View on Apple Maps WFD catchment Houselop Beck from Source to Wear (GB103024077450) 2024 spills / hours 41 / 160 Long-term average 60.2 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 1,029 hours spilling →	Heatherley Clough	74	1,029	up 80%	100%
Nenthead STW Storm tank at sewage works Sewage works Nenthead EA ID / permit NWL00924 · 232/1097 Outlet location NY7768144305 (OS grid reference) · View on Apple Maps WFD catchment Nent from Source to South Tyne (GB103023075420) 2024 spills / hours 109 / 1,723 Long-term average 96.5 spills a year (monitored since 2024) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Comms failure / issue · Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 986 hours spilling →	River Nent	84	986	down 23%	76%
Bluehouse Gill CSO Overflow on sewer network EA ID / permit NWL00161 · 255/1075 Outlet location NZ4628939473 (OS grid reference) · View on Apple Maps WFD catchment Blue House Gill (GB650301500002) Bathing water Crimdon 2024 spills / hours 97 / 1,035 Long-term average 83.5 spills a year (monitored since 2018) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 931 hours spilling →	Bluehouse Gill (North Sea)	104	931	up 7%	100%
Blyth No. 5 SPS Storm discharge at pumping station EA ID / permit NWL00164 · 226/1176 Outlet location NZ3157981847 (OS grid reference) · View on Apple Maps WFD catchment BLYTH (N) (GB510302203200) 2024 spills / hours 118 / 1,612 Long-term average 80.5 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 917 hours spilling →	River Blyth (Saline Estuary)	81	917	down 31%	100%
Great Broughton STW Storm tank at sewage works Sewage works Great Broughton EA ID / permit NWL00615 · 25/04/1676 Outlet location NZ5412007120 (OS grid reference) · View on Apple Maps WFD catchment Broughton Beck from Source to River Leven (GB103025071870) 2024 spills / hours 74 / 702 Long-term average 86.5 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 845 hours spilling →	Broughton Beck	56	845	down 24%	100%
Howdon STW Inlet overflow at sewage works Sewage works Howdon EA ID / permit NWL00713 · 235/1695 Outlet location NZ3370066130 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 160 / 1,379 Long-term average 136.2 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 795 hours spilling →	River Tyne Saline Estuary	113	795	down 29%	100%
Cargo Fleet SPS Storm discharge at pumping station EA ID / permit NWL00246 · 254/1514 Outlet location NZ5145020480 (OS grid reference) · View on Apple Maps WFD catchment TEES (GB510302509900) 2024 spills / hours 83 / 866 Long-term average 67.7 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 783 hours spilling →	Ormsby Beck	81	783	down 2%	100%
Hadston Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL00635 · 224/0990 Outlet location NZ2756999143 (OS grid reference) · View on Apple Maps WFD catchment Northumberland South (GB650301500001) Bathing water Druridge Bay North 2024 spills / hours 66 / 1,090 Long-term average 54.6 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 757 hours spilling →	North Sea/Lady Burn	50	757	down 24%	100%
Middleton-in-Teesdale STW Storm tank at sewage works Sewage works Middleton In Teesdale EA ID / permit NWL00878 · 25/01/0919 Outlet location NY9526224911 (OS grid reference) · View on Apple Maps WFD catchment Tees from Maize Beck to Percy Beck (GB103025072511) 2024 spills / hours 129 / 1,710 Long-term average 113.7 spills a year (monitored since 2021) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 753 hours spilling →	River Tees	70	753	down 46%	99%
Longhorsley STW Storm tank at sewage works Sewage works Longhorsley EA ID / permit NWL00810 · 223/0633 Outlet location NZ1551694375 (OS grid reference) · View on Apple Maps WFD catchment Longdike Burn Catchment (trib of Coquet) (GB103022076550) 2024 spills / hours 78 / 1,347 Long-term average 49.3 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 726 hours spilling →	Paxtondean Burn	39	726	down 50%	100%
Newfield STW Storm tank at sewage works Sewage works Newfield EA ID / permit NWL00949 · 243/1015 Outlet location NZ2004233525 (OS grid reference) · View on Apple Maps WFD catchment Wear from Gaunless to Browney (GB103024077464) 2024 spills / hours 115 / 1,049 Long-term average 77.2 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 698 hours spilling →	River Wear	96	698	down 17%	100%
Low Wadsworth STW Storm tank at sewage works Sewage works Low Wadsworth EA ID / permit NWL00819 · 241/1097 Outlet location NZ1811430817 (OS grid reference) · View on Apple Maps WFD catchment Wear from Houselop Beck to Beechburn Beck (GB103024077462) 2024 spills / hours 119 / 2,048 Long-term average 102.0 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 680 hours spilling →	River Wear	62	680	down 48%	98%
Tilery Farm Strage Tank CSO Overflow on sewer network EA ID / permit NWL01385 · 255/1185 Outlet location NZ4088536801 (OS grid reference) · View on Apple Maps WFD catchment Crimdon Beck from Source to Sea (GB103025075910) 2024 spills / hours 51 / 492 Long-term average 58.9 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 649 hours spilling →	Heads Hope Burn	63	649	up 24%	98%
Aldbrough SPS Storm discharge at pumping station EA ID / permit NWL00032 · 25/02/1081 Outlet location NZ2058611052 (OS grid reference) · View on Apple Maps WFD catchment Aldbrough Beck from Forcett Park Catch to Clow Bk (GB103025072060) 2024 spills / hours 87 / 1,573 Long-term average 64.8 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 649 hours spilling →	Aldbrough Beck	47	649	down 46%	100%
Powburn Sewage Treatment Works Storm tank at sewage works Sewage works Powburn EA ID / permit NWL01054 · 210/1295 Outlet location NU0620416547 (OS grid reference) · View on Apple Maps WFD catchment Till from Linhope Burn to Roddam Burn (GB102021073041) 2024 spills / hours 104 / 1,336 Long-term average 82.3 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 648 hours spilling →	The Pow Burn (River Till)	38	648	down 63%	99%
Low Wadsworth PS Storm discharge at pumping station EA ID / permit NWL00818 · 241/1081 Outlet location NZ1760030870 (OS grid reference) · View on Apple Maps WFD catchment Wear from Houselop Beck to Beechburn Beck (GB103024077462) 2024 spills / hours 64 / 993 Long-term average 52.4 spills a year (monitored since 2013) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 645 hours spilling →	River Wear	52	645	down 19%	100%
Scots Gap STW Storm tank at sewage works Sewage works Scots Gap EA ID / permit NWL01146 · 225/A/0870 Outlet location NZ0419886103 (OS grid reference) · View on Apple Maps WFD catchment Wansbeck from Ray Burn to Hart Burn (GB103022076990) 2024 spills / hours 102 / 1,275 Long-term average 99.0 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 No improvement action in reporting period Volume & pollution Estimate from 615 hours spilling →	Trib of Middleton Burn	66	615	down 35%	99%
Byers Green SPS Storm discharge at pumping station EA ID / permit NWL00234 · 243/0959 Outlet location NZ2199334709 (OS grid reference) · View on Apple Maps WFD catchment Wear from Gaunless to Browney (GB103024077464) 2024 spills / hours 66 / 754 Long-term average 48.8 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 600 hours spilling →	River Wear	53	600	down 20%	100%
Esh Winning Sewage Treatment Works Storm tank at sewage works Sewage works Esh Winning EA ID / permit NWL00524 · 244/1026 Outlet location NZ2006942196 (OS grid reference) · View on Apple Maps WFD catchment Hedleyhope Burn from Source to Deerness (GB103024077290) 2024 spills / hours 113 / 1,467 Long-term average 87.7 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 600 hours spilling →	Priest Burn	47	600	down 58%	100%
Rookhope STW Inlet overflow at sewage works Sewage works Rookhope EA ID / permit NWL01121 · 241/1145 Outlet location NY9429041827 (OS grid reference) · View on Apple Maps WFD catchment Rookhope Burn from Source to Wear (GB103024077530) 2024 spills / hours 118 / 1,370 Long-term average 94.5 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 completed Volume & pollution Estimate from 596 hours spilling →	Rookhope Burn	59	596	down 50%	100%
Moorsholm Sewage Treatment Works Inlet overflow at sewage works Sewage works Moorsholm EA ID / permit NWL00903 · 25/06/1010 Outlet location NZ6904015580 (OS grid reference) · View on Apple Maps WFD catchment Kilton Beck from Source to Middle Gill Beck (GB103025071920) 2024 spills / hours 127 / 719 Long-term average 94.2 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 587 hours spilling →	Hagg Beck (Kilton Beck Trib)	113	587	down 11%	99%
Cattle Market B CSO Overflow on sewer network EA ID / permit NWL00260 · 242/1045 Outlet location NZ2143428999 (OS grid reference) · View on Apple Maps WFD catchment Gaunless from Hummer Beck to Wear (GB103024072730) 2024 spills / hours 97 / 1,086 Long-term average 77.8 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 No improvement action in reporting period Volume & pollution Estimate from 582 hours spilling →	River Gaunless	78	582	down 20%	98%
Middleton Airport Storm Tw Storm discharge at pumping station EA ID / permit NWL00875 · EPRPB3193VX Outlet location NZ3539911878 (OS grid reference) · View on Apple Maps WFD catchment Tees from Skerne to Tidal Limit (GB103025072595) 2024 spills / hours 39 / 613 Long-term average 54.0 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 580 hours spilling →	River Tees	42	580	up 8%	98%
Tyne View Terrace PS Storm discharge at pumping station EA ID / permit NWL01417 · 235/1690 Outlet location NZ3328666098 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 86 / 866 Long-term average 73.3 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 573 hours spilling →	River Tyne	65	573	down 24%	100%
Fir Tree STW Storm tank at sewage works Sewage works Fir Tree EA ID / permit NWL00555 · 241/1013 Outlet location NZ1368934172 (OS grid reference) · View on Apple Maps WFD catchment Wear from Houselop Beck to Beechburn Beck (GB103024077462) 2024 spills / hours 108 / 939 Long-term average 78.0 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 556 hours spilling →	Wadley Burn	56	556	down 48%	98%
Limekiln Gill Pumping Station Storm discharge at pumping station EA ID / permit NWL00793 · 255/1114 Outlet location NZ4776138312 (OS grid reference) · View on Apple Maps WFD catchment Tyne and Wear (GB650301500002) Bathing water Crimdon 2024 spills / hours 3 / 27 Long-term average 17.0 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 544 hours spilling →	North Sea	32	544	up 967%	100%
Stannington Village SPS Storm discharge at pumping station EA ID / permit NWL01282 · 226/1000 Outlet location NZ2132678967 (OS grid reference) · View on Apple Maps WFD catchment Blyth from Pont to Tidal Limit (GB103022077052) 2024 spills / hours 81 / 1,358 Long-term average 57.0 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 542 hours spilling →	Catraw Burn (Blyth)	32	542	down 60%	100%
Great Ayton Sewage Treatment Works Storm tank at sewage works Sewage works Great Ayton EA ID / permit NWL00613 · 25/04/1859 Outlet location NZ5469309700 (OS grid reference) · View on Apple Maps WFD catchment Leven from Source to Tame (GB103025071890) 2024 spills / hours 67 / 718 Long-term average 64.0 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation No investigation activity in reporting period Improvement Operational improvement completed Volume & pollution Estimate from 533 hours spilling →	River Leven	50	533	down 25%	100%
Marske Sewage Treatment Works Inlet overflow at sewage works Sewage works Marske EA ID / permit NWL00856 · 25/06/1015 Outlet location NZ6405024200 (OS grid reference) · View on Apple Maps WFD catchment Tees Coastal (GB650301500005) Bathing water Marske Sands 2024 spills / hours 107 / 784 Long-term average 99.6 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 531 hours spilling →	North Sea	75	531	down 30%	100%
Sedgeletch STW Storm tank at sewage works Sewage works Sedgeletch EA ID / permit NWL01176 · 245/1243 Outlet location NZ3202550822 (OS grid reference) · View on Apple Maps WFD catchment Lumley Park Burn from Source to Herrington Burn (GB103024077580) 2024 spills / hours 64 / 738 Long-term average 43.8 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 526 hours spilling →	Herrington Burn/Moors Burn	44	526	down 31%	92%
Amble Sewage Treatment Works Inlet overflow at sewage works Sewage works Amble EA ID / permit NWL00049 · 223/0931 Outlet location NU2767004990 (OS grid reference) · View on Apple Maps WFD catchment Northumberland South (GB650301500001) 2024 spills / hours 124 / 626 Long-term average 127.0 spills a year (monitored since 2021) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 522 hours spilling →	North Sea	91	522	down 27%	100%
Edmondsley STW Storm tank at sewage works Sewage works Edmondsley EA ID / permit NWL00498 · 245/0839 Outlet location NZ2375950175 (OS grid reference) · View on Apple Maps WFD catchment Cong Burn from Source to Twizell Burn (GB103024077560) 2024 spills / hours 61 / 700 Long-term average 54.8 spills a year (monitored since 2020) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 520 hours spilling →	Little Burn, Trib of Cong Burn	45	520	down 26%	100%
Frosterley Sewage Treatment Works Inlet overflow at sewage works Sewage works Frosterley EA ID / permit NWL00576 · 241/1104 Outlet location NZ0442036871 (OS grid reference) · View on Apple Maps WFD catchment Wear from Middlehope Burn to Houselop Beck (GB103024077461) 2024 spills / hours 71 / 244 Long-term average 70.6 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 513 hours spilling →	Wear	52	513	down 27%	99%
Eland Lane (New) Pumping Station Storm discharge at pumping station EA ID / permit NWL00504 · 226/A/0965 Outlet location NZ1662472984 (OS grid reference) · View on Apple Maps WFD catchment Pont from Med Burn to Small Burn (GB103022076860) 2024 spills / hours 99 / 1,331 Long-term average 77.2 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 Operational improvement ongoing Volume & pollution Estimate from 510 hours spilling →	Pont	47	510	down 53%	100%
East Tanfield STW Storm tank at sewage works Sewage works East Tanfield EA ID / permit NWL00488 · 235/1871 Outlet location NZ1973655324 (OS grid reference) · View on Apple Maps WFD catchment Team from Source to Tyne (GB103023075670) 2024 spills / hours 86 / 856 Long-term average 82.7 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 497 hours spilling →	Causey Burn	51	497	down 41%	100%
Tyneside CSO (No B5/301) Overflow on sewer network EA ID / permit NWL01418 · 235/B/0169 Outlet location NZ3348164722 (OS grid reference) · View on Apple Maps WFD catchment Don from Source to Tidal Limit (GB103023075690) 2024 spills / hours 111 / 933 Long-term average 117.1 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 491 hours spilling →	Don	121	491	up 9%	100%
Colwell STW Inlet overflow at sewage works Sewage works Colwell EA ID / permit NWL00309 · 231/1077 Outlet location NY9538575002 (OS grid reference) · View on Apple Maps WFD catchment Barrasford Burn Catchment (trib of N Tyne) (GB103023074890) 2024 spills / hours 131 / 2,590 Long-term average 125.2 spills a year (monitored since 2021) 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 486 hours spilling →	Coal Burn	69	486	down 47%	94%
Newbiggin Sewage Treatment Works Inlet overflow at sewage works Sewage works Newbiggin EA ID / permit NWL00940 · 225/1031 Outlet location NZ3238286215&NZ3129786715 (OS grid reference) · View on Apple Maps WFD catchment Tyne and Wear (GB650301500002) Bathing water Newbiggin North; Newbiggin South 2024 spills / hours 88 / 624 Long-term average 63.9 spills a year (monitored since 2018) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 479 hours spilling →	North Sea	78	479	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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