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
Tudhoe Mill Sewage Treatment Works Inlet overflow at sewage works Sewage works Tudhoe Mill EA ID / permit NWL01405 · 243/0985 Outlet location NZ2422735898 (OS grid reference) · View on Apple Maps WFD catchment Wear from Gaunless to Browney (GB103024077464) 2024 spills / hours 49 / 232 Long-term average 51.7 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Comms failure / issue · Resolved - Jun Investigation Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 169 hours spilling →	Valley Burn	41	169	down 16%	78%
Seaton North Hotel CSO (WK013) Overflow on sewer network EA ID / permit NWL01171 · 225/1070 Outlet location NZ2814686018 (OS grid reference) · View on Apple Maps WFD catchment Wansbeck from Bothal Burn to North Sea (GB103022077062) 2024 spills / hours 57 / 216 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 169 hours spilling →	Rowlington Burn(R Wansbeck)	43	169	down 25%	98%
Carlton in Cleveland STW Inlet overflow at sewage works Sewage works Carlton In Cleveland EA ID / permit NWL00248 · 25/04/1800 Outlet location NZ5073004934 (OS grid reference) · View on Apple Maps WFD catchment Leven from Tame to River Tees (GB103025071880) 2024 spills / hours 93 / 324 Long-term average 79.0 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 166 hours spilling →	Alum Beck	89	166	down 4%	100%
Brus Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL00212 · 255/5021 Outlet location NZ5056035680 (OS grid reference) · View on Apple Maps WFD catchment North Sea (GB650301500005) 2024 spills / hours 52 / 438 Long-term average 37.0 spills a year (monitored since 2020) High-spill reason (company) Data collection - Tidal / river inundation Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 165 hours spilling →	North Sea	31	165	down 40%	100%
Grassholm Place CSO Overflow on sewer network EA ID / permit NWL00608 · 235/1896 Outlet location NZ2613769185 (OS grid reference) · View on Apple Maps WFD catchment Ouse Burn from Source to Tyne (GB103023075780) 2024 spills / hours 50 / 434 Long-term average 42.3 spills a year (monitored since 2013) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 165 hours spilling →	Ouse Burn	29	165	down 42%	93%
New Welbeck Road SPS Storm discharge at pumping station EA ID / permit NWL00938 · 235/1755 Outlet location NZ2984664771 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 70 / 640 Long-term average 52.6 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 165 hours spilling →	River Tyne	34	165	down 51%	93%
Browney Lane CSO Overflow on sewer network EA ID / permit NWL00208 · 244/1003 Outlet location NZ2500538681 (OS grid reference) · View on Apple Maps WFD catchment Browney from Deerness confl to Wear (GB103024077552) 2024 spills / hours 41 / 224 Long-term average 48.6 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 165 hours spilling →	Unnamed Trib. of River Browney	44	165	up 7%	98%
Etal Sewage Treatment Works Inlet overflow at sewage works Sewage works Etal EA ID / permit NWL00527 · 210/0899 Outlet location NT9260839534 (OS grid reference) · View on Apple Maps WFD catchment Till from Glen to River Tweed (GB102021073050) 2024 spills / hours 38 / 257 Long-term average 56.8 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 completed Volume & pollution Estimate from 165 hours spilling →	River Till	88	165	up 132%	96%
The Hollows CSO WV50 Overflow on sewer network EA ID / permit NWL01364 · 241/1125 Outlet location NZ1641434186 (OS grid reference) · View on Apple Maps WFD catchment Beechburn Beck (Trib of Wear) (GB103024077390) 2024 spills / hours 42 / 236 Long-term average 52.2 spills a year (monitored since 2014) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 165 hours spilling →	Beechburn Beck	38	165	down 10%	99%
Crookhall STW Inlet overflow at sewage works Sewage works Crookhall EA ID / permit NWL00351 · 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 73 / 324 Long-term average 67.5 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 164 hours spilling →	Stockerley Burn, Tributary of	62	164	down 15%	100%
Stobs Ford SPS Storm discharge at pumping station EA ID / permit NWL01305 · 225/G/0400 Outlet location NZ2082986405 (OS grid reference) · View on Apple Maps WFD catchment Wansbeck from Font to Bothal Burn (GB103022077061) 2024 spills / hours 67 / 355 Long-term average 55.1 spills a year (monitored since 2019) 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 164 hours spilling →	River Wansbeck	48	164	down 28%	100%
Bowes Sewage Treatment Works Storm tank at sewage works Sewage works Bowes EA ID / permit NWL00180 · 25/02/1105 Outlet location NY9978013150 (OS grid reference) · View on Apple Maps WFD catchment Greta from Sleightholme Beck to Eller Beck (GB103025072140) 2024 spills / hours 57 / 283 Long-term average 54.6 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 164 hours spilling →	River Greta	34	164	down 40%	100%
Coop House Wood CSO Overflow on sewer network EA ID / permit NWL00321 · 255/1135 Outlet location NZ3935245268 (OS grid reference) · View on Apple Maps WFD catchment Dalton Beck to North Sea (GB103025075970) Bathing water Seaham Beach 2024 spills / hours 42 / 347 Long-term average 36.0 spills a year (monitored since 2014) 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 162 hours spilling →	Coop House Dene Burn	36	162	down 14%	93%
Church Dene CSO Overflow on sewer network EA ID / permit NWL00285 · 232/1010 Outlet location NY8385655983 (OS grid reference) · View on Apple Maps WFD catchment Allen from Source to West Allen (GB103023074710) 2024 spills / hours 79 / 354 Long-term average 42.5 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 161 hours spilling →	Unnamed Trib River Burn	53	161	down 33%	99%
Slaley STW Inlet overflow at sewage works Sewage works Slaley EA ID / permit NWL01211 · 233/1178 Outlet location NY9839957296 (OS grid reference) · View on Apple Maps WFD catchment March Burn Catchment (trib of Tyne) (GB103023075650) 2024 spills / hours 18 / 9.7 Long-term average 35.4 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 159 hours spilling →	Flothers Burn	36	159	up 100%	99%
Blaydon Metals No 2 CSO Overflow on sewer network EA ID / permit NWL00158 · 235/1686 Outlet location NZ1869463551 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 47 / 272 Long-term average 25.4 spills a year (monitored since 2013) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 159 hours spilling →	Tyne	36	159	down 23%	100%
Blaydon Metals No 1 CSO Overflow on sewer network EA ID / permit NWL00157 · 235/1685 Outlet location NZ1867963540&NZ1869463551 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 46 / 297 Long-term average 36.9 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 158 hours spilling →	Tyne Saline Estuary	34	158	down 26%	98%
Hadston Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL00634 · 224/0990 Outlet location NU2600800143 (OS grid reference) · View on Apple Maps WFD catchment Northumberland South (GB650301500001) Bathing water Druridge Bay North 2024 spills / hours 44 / 485 Long-term average 35.3 spills a year (monitored since 2020) Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 157 hours spilling →	North Sea/Lady Burn	15	157	down 66%	100%
CSO on Whickham and Gateshead Sewer Overflow on sewer network EA ID / permit NWL00394 · 235/1252 Outlet location NZ2340862006 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 64 / 372 Long-term average 61.4 spills a year (monitored since 2018) High-spill reason (company) Data collection - Tidal / river inundation Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 157 hours spilling →	Team	42	157	down 34%	100%
Whorlton STW Inlet overflow at sewage works Sewage works Whorlton EA ID / permit NWL01522 · 25/02/1087 Outlet location NZ1088314547 (OS grid reference) · View on Apple Maps WFD catchment Tees from River Greta to River Skerne (GB103025072190) 2024 spills / hours 92 / 1,515 Long-term average 28.8 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 157 hours spilling →	River Tees	19	157	down 79%	100%
Aislaby Road Pumping Station Storm discharge at pumping station EA ID / permit NWL01584 · 254/1250 Outlet location NZ4154013170 (OS grid reference) · View on Apple Maps WFD catchment Tees from Skerne to Tidal Limit (GB103025072595) 2024 spills / hours 0 / 0.0 Long-term average 30.0 spills a year (monitored since 2025) Monitor below 90% Comms failure / issue · Resolved - Jun Investigation Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 155 hours spilling →	Tees Estuary	30	155	up from 0	58%
Windlestone STW Storm tank at sewage works Sewage works Windlestone EA ID / permit NWL01533 · 253/1269 Outlet location NZ2899028590 (OS grid reference) · View on Apple Maps WFD catchment Rushyford Beck from Source to Woodham Burn (GB103025072450) 2024 spills / hours 30 / 181 Long-term average 44.2 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 153 hours spilling →	Rushyford Beck, Tributary of	24	153	down 20%	100%
South Blyth Harbour CSO Overflow on sewer network EA ID / permit NWL01221 · 226/1210 Outlet location NZ3210580797 (OS grid reference) · View on Apple Maps WFD catchment BLYTH (N) (GB510302203200) Bathing water Blyth South Beach 2024 spills / hours 47 / 342 Long-term average 35.8 spills a year (monitored since 2016) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Sensor failure / issue · Resolved - January after reporting year Investigation Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 152 hours spilling →	River Blyth (Saline Estuary)	34	152	down 28%	89%
Bishopton Road CSO Overflow on sewer network EA ID / permit NWL00140 · 254/1379 Outlet location NZ4377319734 (OS grid reference) · View on Apple Maps WFD catchment Lustrum Beck Catchment (trib of Tees) (GB103025072550) 2024 spills / hours 27 / 223 Long-term average 31.8 spills a year (monitored since 2013) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 152 hours spilling →	Lustrum Beck	28	152	up 4%	99%
Kirklevington STW Storm tank at sewage works Sewage works Kirklevington EA ID / permit NWL00764 · 25/04/1773 Outlet location NZ4272010310 (OS grid reference) · View on Apple Maps WFD catchment Saltergill Beck Catchment (trib of Tees) (GB103025072050) 2024 spills / hours 59 / 773 Long-term average 42.0 spills a year (monitored since 2020) Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 151 hours spilling →	Saltergill Beck	19	151	down 68%	100%
Ashington CSO Park Road Wk 006 Overflow on sewer network EA ID / permit NWL00062 · 225/1029 Outlet location NZ2708086616 (OS grid reference) · View on Apple Maps WFD catchment Wansbeck from Bothal Burn to North Sea (GB103022077062) 2024 spills / hours 30 / 210 Long-term average 15.2 spills a year (monitored since 2013) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 150 hours spilling →	Blackclose Burn (R.Wansbeck)	24	150	down 20%	98%
South Park CSO DL035 Overflow on sewer network EA ID / permit NWL01233 · 25/03/1230 Outlet location NZ2839612932 (OS grid reference) · View on Apple Maps WFD catchment Skerne from Demons Beck to Tees (GB103025072596) 2024 spills / hours 40 / 238 Long-term average 37.4 spills a year (monitored since 2018) Monitor below 90% Power failure / issue · Resolved - Sep Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 150 hours spilling →	River Skerne	30	150	down 25%	88%
Travellers Green CSO (SE015) Overflow on sewer network EA ID / permit NWL01400 · 253/1263 Outlet location NZ2910823663 (OS grid reference) · View on Apple Maps WFD catchment Skerne form Woodham Burn to Demons Beck (GB103025072391) 2024 spills / hours 56 / 212 Long-term average 57.6 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 completed Volume & pollution Estimate from 150 hours spilling →	River Skerne	43	150	down 23%	100%
Greatham STW Storm tank at sewage works Sewage works Greatham EA ID / permit NWL00617 · 25/04/1858 Outlet location NZ4920227166 (OS grid reference) · View on Apple Maps WFD catchment Greatham Beck Catchment (trib of Tidal Tees) (GB103025076030) 2024 spills / hours 81 / 480 Long-term average 69.2 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 149 hours spilling →	Greatham Beck	38	149	down 53%	99%
CSO at Team Street Overflow on sewer network EA ID / permit NWL00381 · 235/1250 Outlet location NZ2350062335 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 36 / 416 Long-term average 26.3 spills a year (monitored since 2018) Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 149 hours spilling →	River Team (Estuary)	17	149	down 53%	100%
Tudor Road CSO Overflow on sewer network EA ID / permit NWL01408 · 235/1905 Outlet location NZ3583766907 (OS grid reference) · View on Apple Maps WFD catchment River Tyne (GB510302310200) 2024 spills / hours 58 / 262 Long-term average 53.5 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 149 hours spilling →	River Tyne Estuarine Waters	42	149	down 28%	100%
Wapping Street CSO Overflow on sewer network EA ID / permit NWL01450 · 235/1902 Outlet location NZ3625168068 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) Bathing water Littlehaven Beach 2024 spills / hours 53 / 229 Long-term average 35.1 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 147 hours spilling →	River Tyne Estuarine Waters	58	147	up 9%	90%
Pegswood STW Storm tank at sewage works Sewage works Pegswood EA ID / permit NWL01019 · 225/1079 Outlet location NZ2337187452 (OS grid reference) · View on Apple Maps WFD catchment Bothal Burn Catchment (trib of Wansbeck) (GB103022077030) 2024 spills / hours 31 / 252 Long-term average 21.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 147 hours spilling →	Bothal Burn	20	147	down 35%	100%
Dunston Flour Mill (West) CSO Overflow on sewer network EA ID / permit NWL00465 · 235/1738 Outlet location NZ2257962750 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 48 / 571 Long-term average 33.4 spills a year (monitored since 2013) Investigation Operational investigation completed Improvement Operational improvement completed Volume & pollution Estimate from 146 hours spilling →	River Tyne Saline Estuary	14	146	down 71%	91%
Trimdon Colliery SPS Storm discharge at pumping station EA ID / permit NWL01401 · 25/03/1233 Outlet location NZ3815235365 (OS grid reference) · View on Apple Maps WFD catchment Skerne from Source to Carrs (GB103025076070) 2024 spills / hours 45 / 226 Long-term average 51.0 spills a year (monitored since 2019) 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 146 hours spilling →	Langley Beck	33	146	down 27%	100%
Sands Syphon SSO Overflow on sewer network EA ID / permit NWL01142 · 245/0906 Outlet location NZ2793243111 (OS grid reference) · View on Apple Maps WFD catchment Wear from Croxdale Beck to Lumley Park Burn (GB103024077621) 2024 spills / hours 45 / 238 Long-term average 40.6 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 146 hours spilling →	River Wear	49	146	up 9%	100%
Milk Market Pumping Station Storm discharge at pumping station EA ID / permit NWL00882 · 235/1115 Outlet location NZ2547963929 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 31 / 84 Long-term average 30.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 145 hours spilling →	Tyne Estuary	29	145	down 6%	100%
Stokesley SPS No 2 CSO Storm discharge at pumping station EA ID / permit NWL01311 · 254/C/0428 Outlet location NZ5261208446 (OS grid reference) · View on Apple Maps WFD catchment Leven from Source to Tame (GB103025071890) 2024 spills / hours 36 / 213 Long-term average 26.6 spills a year (monitored since 2019) 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 145 hours spilling →	River Leven	35	145	down 3%	100%
Teams CSO Johnson Street E17-105 Overflow on sewer network EA ID / permit NWL01574 · EPRBB3893EZ Outlet location NZ2417362806 (OS grid reference) · View on Apple Maps WFD catchment River Tyne (GB510302310200) 2024 spills / hours 60 / 294 Long-term average 60.5 spills a year (monitored since 2022) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 143 hours spilling →	River Tyne	48	143	down 20%	100%
Clockwood Sewage Pumping Station Storm discharge at pumping station EA ID / permit NWL00299 · 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 56 / 516 Long-term average 16.4 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 143 hours spilling →	River Tees	22	143	down 61%	100%
Ferryboat Lane Pumping Station Storm discharge at pumping station EA ID / permit NWL00549 · 245/1208 Outlet location NZ3515057100 (OS grid reference) · View on Apple Maps WFD catchment WEAR (GB510302402900) 2024 spills / hours 27 / 300 Long-term average 20.2 spills a year (monitored since 2013) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 142 hours spilling →	River Wear (Saline Estuary)	12	142	down 56%	96%
Kimberley Gardens CSO (Der 82) Overflow on sewer network EA ID / permit NWL00754 · 245/1308 Outlet location NZ2123051430 (OS grid reference) · View on Apple Maps WFD catchment Twizell Burn from Source to Cong Burn (GB103024077590) 2024 spills / hours 25 / 101 Long-term average 47.3 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 141 hours spilling →	Twizell Burn Tributary	60	141	up 140%	100%
Nightingale Place CSO Overflow on sewer network EA ID / permit NWL00955 · 245/1311 Outlet location NZ2075951817 (OS grid reference) · View on Apple Maps WFD catchment Twizell Burn from Source to Cong Burn (GB103024077590) 2024 spills / hours 43 / 204 Long-term average 57.2 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 141 hours spilling →	Stanley Burn, Tributary of	58	141	up 35%	99%
Cassop STW Storm tank at sewage works Sewage works Cassop EA ID / permit NWL00251 · 243/1016 Outlet location NZ3412538365 (OS grid reference) · View on Apple Maps WFD catchment Old Durham Beck from Chapman Beck to Wear (GB103024077470) 2024 spills / hours 53 / 364 Long-term average 44.2 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 140 hours spilling →	Chapman Beck	38	140	down 28%	96%
Alnwick STW Inlet overflow at sewage works Sewage works Alnwick EA ID / permit NWL00043 · 222/0862 Outlet location NU2076113137 (OS grid reference) · View on Apple Maps WFD catchment Aln from Edlingham Burn to Tidal Limit (GB103022076350) 2024 spills / hours 71 / 234 Long-term average 65.5 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 140 hours spilling →	River Aln	65	140	down 8%	95%
Aycliffe Sewage Treatment Works Storm tank at sewage works Sewage works Aycliffe EA ID / permit NWL00073 · 253/1278 Outlet location NZ2825323488 (OS grid reference) · View on Apple Maps WFD catchment Skerne from Demons Beck to Tees (GB103025072596) 2024 spills / hours 27 / 264 Long-term average 21.8 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 138 hours spilling →	Demons Beck	11	138	down 59%	98%
Low Pittington Pumping Station Storm discharge at pumping station EA ID / permit NWL00816 · 245/1288 Outlet location NZ3248044730 (OS grid reference) · View on Apple Maps WFD catchment Pittington Beck from Coalford to Old Durham Beck (GB103024077540) 2024 spills / hours 70 / 1,343 Long-term average 42.0 spills a year (monitored since 2013) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 137 hours spilling →	Pittington Beck	16	137	down 77%	99%
St Andrews Road CSO Overflow on sewer network EA ID / permit NWL01260 · 235/1715 Outlet location NZ1967654170 (OS grid reference) · View on Apple Maps WFD catchment Team from Source to Tyne (GB103023075670) 2024 spills / hours 41 / 304 Long-term average 47.1 spills a year (monitored since 2013) High-spill reason (company) Performance - SW Infiltration Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 137 hours spilling →	Unnamed Trib Houghwell Burn	34	137	down 17%	99%
Bishop Middleham Sewage Works Storm tank at sewage works Sewage works Bishop Middleham EA ID / permit NWL00135 · 25/03/1221 Outlet location NZ3271030300 (OS grid reference) · View on Apple Maps WFD catchment Carrs from Source to Skerne (GB103025072520) 2024 spills / hours 46 / 233 Long-term average 32.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing, Operational investigation ongoing Improvement Operational improvement ongoing Volume & pollution Estimate from 137 hours spilling →	The Carrs	21	137	down 54%	100%
Staithes Road CSO Overflow on sewer network EA ID / permit NWL01275 · 235/1253 Outlet location NZ2325962470 (OS grid reference) · View on Apple Maps WFD catchment TYNE (GB510302310200) 2024 spills / hours 54 / 373 Long-term average 50.4 spills a year (monitored since 2019) Investigation Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 136 hours spilling →	River Team	30	136	down 44%	98%

Sewage treatment works

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

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