Storm overflow register · 2025 annual return

Anglian Water storm overflows, 2025

Anglian Water reported 1,442 storm overflows in England for 2025. Together they recorded 17,322 spills over 105,806 hours, an average of 12.0 spills per overflow against 20.4 across England. That ranks 1 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 61% on 2024.

244 overflows did not spill · 38 spilled more than 60 times · 1,323 had monitors working for 90% of the year or more · 419 sewage treatment works with overflows

Hours spilling by month, 2025

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

All Anglian 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
Clacton (Holland Haven) WRC Inlet overflow at sewage works Sewage works Clacton Company site name Clacton (Holland Haven) Water Recycling Centre EA ID / permit AWS00234 · AEECS12401 Outlet location TM2226016500 (OS grid reference) · View on Apple Maps WFD catchment Essex (GB650503520001) Bathing water Holland 2024 spills / hours 95 / 656 Long-term average 93.0 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 262 hours spilling →	North Sea	58	262	down 39%	100%
Wilburton STW Storm discharge at pumping station EA ID / permit AWS01502 · AECNF11021 Outlet location TL4882075750 (OS grid reference) · View on Apple Maps WFD catchment Old Bedford River / River Delph (inc The Hundred Foot Washes) (GB205033000060) 2024 spills / hours 44 / 414 Long-term average 33.4 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 261 hours spilling →	Trib Grunty Fen Catchwater	28	261	down 36%	100%
Geddington STW Storm tank at sewage works Sewage works Geddington EA ID / permit AWS00463 · AW5NF94 Outlet location SP8942082290 (OS grid reference) · View on Apple Maps WFD catchment Ise - Upper (GB105032045200) 2024 spills / hours 203 / 4,380 Long-term average 89.3 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 259 hours spilling →	River Ise R.Nene Nt	23	259	down 89%	99%
Saxilby STW Storm tank at sewage works Sewage works Saxilby EA ID / permit AWS01102 · ANNNF10347 Outlet location SK8869074860 (OS grid reference) · View on Apple Maps WFD catchment Skellingthorpe Main Drain (GB105030062390) 2024 spills / hours 42 / 166 Long-term average 43.5 spills a year (monitored since 2022) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 259 hours spilling →	Fossdyke Canal	41	259	down 2%	100%
Allington STW Storm tank at sewage works Sewage works Allington EA ID / permit AWS00016 · ANNNF873/13380 Outlet location SK8614039950 (OS grid reference) · View on Apple Maps WFD catchment Foston Beck (GB105030056740) 2024 spills / hours 54 / 539 Long-term average 39.3 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 257 hours spilling →	tributary Foston Beck	28	257	down 48%	100%
A508 Roundabout Overflow on sewer network Company site name WOLLASTON A509 ROUNDABOUT CSO#1 EA ID / permit AWS00006 · AWNNF13856 Outlet location SP9029063030 (OS grid reference) · View on Apple Maps WFD catchment Nene - conf Brampton Branch to conf Ise (GB105032045050) 2024 spills / hours 43 / 64 Long-term average 38.0 spills a year (monitored since 2024) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 252 hours spilling →	Trib. of Wollaston Brook	33	252	down 23%	94%
Tugby STW Storm tank at sewage works Sewage works Tugby EA ID / permit AWS01406 · AW5NF762 Outlet location SK7600000500 (OS grid reference) · View on Apple Maps WFD catchment Stonton Brook (GB105031050460) 2024 spills / hours 54 / 293 Long-term average 57.5 spills a year (monitored since 2022) 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 249 hours spilling →	Trib of Stanton Brook River We	64	249	up 19%	100%
Claypole STW Storm tank at sewage works Sewage works Claypole EA ID / permit AWS00243 · ANNNF13354 Outlet location SK8408049660 (OS grid reference) · View on Apple Maps WFD catchment Witham - conf Cringle Bk to conf Brant (GB105030056780) 2024 spills / hours 57 / 703 Long-term average 41.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 248 hours spilling →	River Witham	30	248	down 47%	100%
March Water Recycling Centre Storm tank at sewage works Sewage works March Company site name MARCH STW EA ID / permit AWS00811 · AW1NF1063 Outlet location TL4403099290 (OS grid reference) · View on Apple Maps WFD catchment Middle Level (GB205033000050) 2024 spills / hours 67 / 1,140 Long-term average 55.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 245 hours spilling →	Twenty Foot River	27	245	down 60%	98%
Chatteris(Nightlay) STW Storm tank at sewage works Sewage works Chatteris Company site name CHATTERIS-NIGHTLAYER FEN STW EA ID / permit AWS00215 · AECNF1039 Outlet location TL3950087290 (OS grid reference) · View on Apple Maps WFD catchment Middle Level (GB205033000050) 2024 spills / hours 96 / 1,058 Long-term average 68.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 240 hours spilling →	Nightlayers Fen Int Drain	26	240	down 73%	100%
Southend Sewage Works Inlet overflow at sewage works Sewage works Southend Company site name SOUTHEND STW EA ID / permit AWS01194 · CASM.0072 Outlet location TQ9070081920 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) 2024 spills / hours 43 / 196 Long-term average 78.0 spills a year (monitored since 2021) High-spill reason (company) Not asset maintenance - Hydraulic capacity Monitor below 90% Telemetry or data archiving failure / issue · Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 237 hours spilling →	Thames Estuary	94	237	up 119%	28%
North Coates Water Recycling Centre Storm tank at sewage works Sewage works North Coates Company site name NORTH COTES STW EA ID / permit AWS00890 · ANNNF1298 Outlet location TA3535000410 (OS grid reference) · View on Apple Maps WFD catchment Louth Canal (GB104029061990) 2024 spills / hours 28 / 231 Long-term average 21.7 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 237 hours spilling →	Old Fleet Drain Louth Canal N	28	237	no change	100%
Windsor Drive CSO Overflow on sewer network Company site name MARCH-WINDSOR DRIVE OV EA ID / permit AWS01509 · AECNF11568 Outlet location TL4082096940 (OS grid reference) · View on Apple Maps WFD catchment Middle Level (GB205033000050) 2024 spills / hours 35 / 219 Long-term average 28.7 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 236 hours spilling →	River Nene (Old Course)	23	236	down 34%	96%
Bassingham Water Recycling Centre Inlet overflow at sewage works Sewage works Bassingham Company site name Bassingham WRC EA ID / permit AWS00064 · ANNNF10345 Outlet location SK9072059820 (OS grid reference) · View on Apple Maps WFD catchment Witham - conf Cringle Bk to conf Brant (GB105030056780) 2024 spills / hours 57 / 591 Long-term average 47.5 spills a year (monitored since 2022) High-spill reason (company) Performance - Other maintenance / capital works (e.g. jetting) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 232 hours spilling →	River Witham	48	232	down 16%	100%
Holcot SPS Storm discharge at pumping station Company site name HOLCOT PS EA ID / permit AWS00606 · AWNNF2385 Outlet location SP7940070000 (OS grid reference) · View on Apple Maps WFD catchment Pitsford Arm of the Brampton Branch (GB105032045470) 2024 spills / hours 58 / 596 Long-term average 37.8 spills a year (monitored since 2020) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 232 hours spilling →	Trib Brixworth Branch of R Nen	40	232	down 31%	100%
Wickford Water Recycling Centre Storm tank at sewage works Sewage works Wickford Company site name WICKFORD STW EA ID / permit AWS01496 · ASETS1322 Outlet location TQ7691094010 (OS grid reference) · View on Apple Maps WFD catchment CROUCH (GB520503704100) 2024 spills / hours 26 / 399 Long-term average 17.0 spills a year (monitored since 2021) Monitor below 90% Capital / maintenance works affect EDM operation · Scheduled Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 232 hours spilling →	River Crouch T	15	232	down 42%	51%
South Benfleet Storm discharge at pumping station Company site name S BENFLEET-WHATLINGTON RD TPS EA ID / permit AWS01157 · AW2NFE08569 Outlet location TQ7659086600 (OS grid reference) · View on Apple Maps WFD catchment THAMES LOWER (GB530603911401) 2024 spills / hours 66 / 549 Long-term average 55.5 spills a year (monitored since 2024) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 231 hours spilling →	Trib Benfleet Creek	45	231	down 32%	100%
White Notley Water Recycling Centre Storm tank at sewage works Sewage works White Notley Company site name WHITE NOTLEY STW EA ID / permit AWS01489 · AW2NF811 Outlet location TL7903018230 (OS grid reference) · View on Apple Maps WFD catchment Brain (GB105037041140) 2024 spills / hours 81 / 1,179 Long-term average 80.0 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement Env Act (SODRP) improvement ongoing, UWWTR improvement ongoing Volume & pollution Estimate from 229 hours spilling →	River Brain Nt	22	229	down 73%	99%
Newmarket Rd Terminal PS Storm discharge at pumping station Company site name STRETHAM-OFF NEWMARKET RD TPS EA ID / permit AWS00875 · AECNF10543 Outlet location TL5142074380 (OS grid reference) · View on Apple Maps WFD catchment Old West River (GB205033043375) 2024 spills / hours 89 / 1,055 Long-term average 39.0 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 229 hours spilling →	tributary Stretham Catchwater	26	229	down 71%	100%
Hackleton SPS Storm discharge at pumping station Company site name HACKLETON SP EA ID / permit AWS00540 · AW5NF1763 Outlet location SP8025154938 (OS grid reference) · View on Apple Maps WFD catchment Wootton Brook (GB105032045550) 2024 spills / hours 76 / 1,504 Long-term average 45.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 228 hours spilling →	Wootton Brook	15	228	down 80%	99%
Benefield STW Storm tank at sewage works (with treatment) Sewage works Benefield EA ID / permit AWS00076 · AW5NF5217 Outlet location SP9960089450 (OS grid reference) · View on Apple Maps WFD catchment Glapthorn Brook (GB105032045250) Treatment Reed bed 2024 spills / hours 56 / 309 Long-term average 71.8 spills a year (monitored since 2021) High-spill reason (company) Performance - Asset configuration (e.g. PS/rising main/storm tanks) Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement Operational improvement ongoing Volume & pollution Estimate from 224 hours spilling →	Benefield Brook	58	224	up 4%	100%
Thorndon Water Recycling Centre Storm tank at sewage works Sewage works Thorndon Company site name THORNDON-CATBRIDGE STW EA ID / permit AWS01369 · AW4NF653X Outlet location TM1381070700 (OS grid reference) · View on Apple Maps WFD catchment Dove (GB105034045710) 2024 spills / hours 85 / 1,100 Long-term average 48.5 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 222 hours spilling →	River Dove Nt	23	222	down 73%	99%
Kimbolton STW Storm tank at sewage works Sewage works Kimbolton EA ID / permit AWS00678 · AWCNF1293 Outlet location TL1169065380 (OS grid reference) · View on Apple Maps WFD catchment Kym (GB105033043270) 2024 spills / hours 116 / 1,604 Long-term average 69.8 spills a year (monitored since 2022) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 221 hours spilling →	River Kym	33	221	down 72%	100%
Shillington STW CSO Overflow on sewer network Company site name SHILLINGTON STW EA ID / permit AWS01126 · AW1NF692 Outlet location TL1166035300 (OS grid reference) · View on Apple Maps WFD catchment Campton Brook (Hit) (GB105033037750) 2024 spills / hours 71 / 887 Long-term average 47.0 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 221 hours spilling →	Campton Brook River Great Ouse	23	221	down 68%	100%
Osbournby Water Recycling Centre Storm tank at sewage works Sewage works Osbournby Company site name OSBOURNBY STW EA ID / permit AWS00955 · ANNNF1161 Outlet location TF0758038220 (OS grid reference) · View on Apple Maps WFD catchment South Beck (GB105030056520) 2024 spills / hours 74 / 772 Long-term average 45.0 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 220 hours spilling →	S.Beck N.Beck South Forty Foot	29	220	down 61%	100%
Ely Water Recycling Centre (Old) Storm tank at sewage works Sewage works Ely Company site name Ely Water Recycling Centre EA ID / permit AWS00410 · AW1NF1176 Outlet location TL5480080000 (OS grid reference) · View on Apple Maps WFD catchment Ely Ouse (South Level) (GB205033000070) 2024 spills / hours 63 / 866 Long-term average 39.7 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 219 hours spilling →	River Great Ouse (Nt)	22	219	down 65%	100%
Sleaford Water Recycling Centre Storm tank at sewage works Sewage works Sleaford Company site name SLEAFORD WRC EA ID / permit AWS01145 · ANNNF13036 Outlet location TF0862047210 (OS grid reference) · View on Apple Maps WFD catchment Slea (GB105030056670) 2024 spills / hours 94 / 961 Long-term average 63.8 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 219 hours spilling →	Old River Slea	40	219	down 57%	100%
Boston New East Side Terminal PS Storm discharge at pumping station Company site name Boston New East Side Terminal Pumping Station EA ID / permit AWS00101 · AW3TSF904 Outlet location TF3400042700 (OS grid reference) · View on Apple Maps WFD catchment WITHAM (GB530503000100) Shellfish water West Wash 2024 spills / hours 45 / 406 Long-term average 49.1 spills a year (monitored since 2019) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation No investigation activity in reporting period Improvement Env Act (SODRP) improvement ongoing, Bathing Water and/or Shellfish Water improvement ongoing Volume & pollution Estimate from 217 hours spilling →	The Wash Estuary	33	217	down 27%	100%
Leiston Valley Road WRC Storm tank at sewage works Sewage works Leiston Valley Road Company site name Leiston Valley Road Water Recycling Centre EA ID / permit AWS00732 · ASENF1122 Outlet location TM4524063310 (OS grid reference) · View on Apple Maps WFD catchment Leiston Beck (GB105035046271) 2024 spills / hours 28 / 329 Long-term average 9.7 spills a year (monitored since 2020) Monitor below 90% Comms failure / issue · Resolved - Feb Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 214 hours spilling →	The Leiston Beck Nt	16	214	down 43%	87%
Oakham WRC Inlet overflow at sewage works Sewage works Oakham Company site name OAKHAM STW EA ID / permit AWS00948 · AW5NF5211 Outlet location SK8723008650 (OS grid reference) · View on Apple Maps WFD catchment South Gwash (GB105031050480) 2024 spills / hours 29 / 160 Long-term average 43.2 spills a year (monitored since 2020) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 213 hours spilling →	Rutland Water/Barleythorpe Bro	55	213	up 90%	100%
Donington Water Recycling Centre Storm tank at sewage works Sewage works Donington Company site name DONINGTON STW EA ID / permit AWS00345 · AW5NF812 Outlet location TF1960034870 (OS grid reference) · View on Apple Maps WFD catchment Black Sluice IDB draining to the South Forty Foot Drain (GB205030051515) 2024 spills / hours 111 / 692 Long-term average 84.5 spills a year (monitored since 2022) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, Operational investigation completed Improvement No improvement action in reporting period Volume & pollution Estimate from 212 hours spilling →	Mill Drain	45	212	down 59%	100%
Bourne STW Storm tank at sewage works Sewage works Bourne EA ID / permit AWS00107 · ANNNF1573 Outlet location TF1097320004 (OS grid reference) · View on Apple Maps WFD catchment Black Sluice IDB draining to the South Forty Foot Drain (GB205030051515) 2024 spills / hours 64 / 696 Long-term average 33.8 spills a year (monitored since 2022) High-spill reason (company) Not asset maintenance - Hydraulic capacity Investigation Env Act (SODRP) investigation ongoing Improvement UWWTR improvement ongoing Volume & pollution Estimate from 212 hours spilling →	Bourne Eau + Black Sluice Dyke	31	212	down 52%	99%
Great Easton(Essex) STW Storm tank at sewage works Sewage works Great Easton Company site name GREAT EASTON STW (ESSEX) EA ID / permit AWS00496 · ASENF10268 Outlet location TL5974025000 (OS grid reference) · View on Apple Maps WFD catchment Chelmer (Gt. Easton - R. Can) (GB105037033950) 2024 spills / hours 89 / 982 Long-term average 65.8 spills a year (monitored since 2022) 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, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 212 hours spilling →	Trib River Chelmer	35	212	down 61%	100%
Ashwellthorpe Water Recycling Ctr Storm tank at sewage works Sewage works Ashwellthorpe Water Recycling Ctr Company site name ASHWELLTHORPE STW EA ID / permit AWS00031 · AEENF1256 Outlet location TM1530097600 (OS grid reference) · View on Apple Maps WFD catchment Tributary of Tas (GB105034050950) 2024 spills / hours 82 / 1,607 Long-term average 45.8 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement UWWTR improvement ongoing Volume & pollution Estimate from 210 hours spilling →	Wreningham Stream River Tas N	18	210	down 78%	99%
Mepal STW Storm tank at sewage works Sewage works Mepal EA ID / permit AWS00837 · AECTF877/11049 Outlet location TL4427081530 (OS grid reference) · View on Apple Maps WFD catchment Old Bedford River / River Delph (inc The Hundred Foot Washes) (GB205033000060) 2024 spills / hours 71 / 1,221 Long-term average 43.8 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 209 hours spilling →	100 Foot River	23	209	down 68%	100%
Steeple Claydon STW Storm tank at sewage works Sewage works Steeple Claydon EA ID / permit AWS01292 · AW1NF866 Outlet location SP6997028020 (OS grid reference) · View on Apple Maps WFD catchment Padbury Brook (The Twins) (GB105033038220) 2024 spills / hours 8 / 59 Long-term average 10.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 207 hours spilling →	Claydon Brook River Great Ouse	24	207	up 200%	100%
Church Road PS, Whepstead Storm discharge at pumping station Company site name WHEPSTEAD-CHURCH RD TPS EA ID / permit AWS00231 · ASENF2213 Outlet location TL8302058330 (OS grid reference) · View on Apple Maps WFD catchment Hawstead Tributary (GB105033042930) 2024 spills / hours 58 / 760 Long-term average 40.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 206 hours spilling →	R Lark	23	206	down 60%	100%
Combined Sewage Overflow Overflow on sewer network Company site name KETTERING -X MARGARET ROAD CSO EA ID / permit AWS00271 · AWNNF13855 Outlet location SP8828079110 (OS grid reference) · View on Apple Maps WFD catchment Ise - Upper (GB105032045200) 2024 spills / hours 57 / 383 Long-term average 37.5 spills a year (monitored since 2024) Monitor below 90% Comms failure / issue · Resolved - Jul Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 206 hours spilling →	The River Ise	18	206	down 68%	68%
Tillingham STW Other storm discharge asset type EA ID / permit AWS01384 · ASENF1226 Outlet location TL9861004290 (OS grid reference) · View on Apple Maps WFD catchment BLACKWATER (GB520503714000) 2024 spills / hours 42 / 525 Long-term average 40.3 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement UWWTR improvement ongoing Volume & pollution Estimate from 205 hours spilling →	Holland Brook	20	205	down 52%	100%
Horning Knackers Wood WRC Storm tank at sewage works Sewage works Horning Knackers Wood Company site name HORNING-KNACKERS WOOD STW EA ID / permit AWS00619 · AW4NF521 Outlet location TG3621018080 (OS grid reference) · View on Apple Maps WFD catchment Ant (Dilham to R. Bure) (GB105034051330) 2024 spills / hours 203 / 4,360 Long-term average 149.0 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 204 hours spilling →	The River Ant	13	204	down 94%	99%
Caldecott SPS Storm discharge at pumping station Company site name CALDECOTT TPS EA ID / permit AWS00190 · AW5NF1792 Outlet location SP8670093400 (OS grid reference) · View on Apple Maps WFD catchment Eye Brook (GB105031050550) 2024 spills / hours 63 / 1,154 Long-term average 38.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 203 hours spilling →	Eye Brook	14	203	down 78%	100%
Heckington STW Storm tank at sewage works Sewage works Heckington EA ID / permit AWS00583 · ANNNF1099 Outlet location TF1498045550 (OS grid reference) · View on Apple Maps WFD catchment Black Sluice IDB draining to the South Forty Foot Drain (GB205030051515) 2024 spills / hours 54 / 622 Long-term average 37.3 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 201 hours spilling →	Heckington Eau	26	201	down 52%	100%
Swinderby(Exraf) STW Storm tank at sewage works Sewage works Swinderby Company site name SWINDERBY STW EA ID / permit AWS01343 · ANNNF13397 Outlet location SK9062061830 (OS grid reference) · View on Apple Maps WFD catchment Witham - conf Cringle Bk to conf Brant (GB105030056780) 2024 spills / hours 52 / 943 Long-term average 48.0 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 200 hours spilling →	unnamed tributary River Witham	13	200	down 75%	99%
High St TPS Boxworth Storm discharge at pumping station Company site name BOXWORTH-HIGH ST TPS EA ID / permit AWS00593 · AWCNF11395 Outlet location TL3529064480 (OS grid reference) · View on Apple Maps WFD catchment Swavesey Drain (GB105033042770) 2024 spills / hours 69 / 799 Long-term average 47.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 199 hours spilling →	unnamed tributary Swavesey Dra	26	199	down 62%	100%
Creaton STW Inlet overflow at sewage works (with treatment) Sewage works Creaton EA ID / permit AWS00293 · AW5NF178 Outlet location SP7150072200 (OS grid reference) · View on Apple Maps WFD catchment Cottesbrooke Brook (GB105032045530) Treatment Reed bed 2024 spills / hours 85 / 1,628 Long-term average 47.8 spills a year (monitored since 2022) Monitor below 90% Power failure / issue · Resolved - Nov Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 197 hours spilling →	Brampton Branch R.Nene Nt	17	197	down 80%	33%
Church Rd TPS CSO Storm discharge at pumping station Company site name CHEVINGTON-CHURCH RD TPS EA ID / permit AWS00230 · ASCNF11670 Outlet location TL7887060010 (OS grid reference) · View on Apple Maps WFD catchment Linnet (GB105033042950) 2024 spills / hours 59 / 785 Long-term average 49.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 196 hours spilling →	Trib R. Linnet	25	196	down 58%	100%
Framlingham STW Storm tank at sewage works Sewage works Framlingham EA ID / permit AWS00451 · ASENF1278 Outlet location TM2833062170 (OS grid reference) · View on Apple Maps WFD catchment Ore (GB105035045970) 2024 spills / hours 52 / 605 Long-term average 43.5 spills a year (monitored since 2022) Investigation Env Act (SODRP) investigation ongoing, Bathing Water and/or Shellfish Water investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 195 hours spilling →	River Ore	25	195	down 52%	100%
Church Brampton Sp Storm discharge at pumping station EA ID / permit AWS00228 · AWCNF2207 Outlet location SP7160065460 (OS grid reference) · View on Apple Maps WFD catchment Church Brampton Arm (GB105032045380) 2024 spills / hours 136 / 2,007 Long-term average 85.5 spills a year (monitored since 2024) High-spill reason (company) Not Applicable - Ongoing investigation Investigation Env Act (SODRP) investigation ongoing, UWWTR investigation ongoing, Operational investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 194 hours spilling →	R Nene (Brixworth Branch)	35	194	down 74%	99%
Stanton Sewage Treatment Works Storm tank at sewage works Sewage works Stanton Company site name STANTON STW EA ID / permit AWS01277 · ASCNF1208 Outlet location TL9723073570 (OS grid reference) · View on Apple Maps WFD catchment Stanton Tributary (GB105033043380) 2024 spills / hours 41 / 458 Long-term average 29.2 spills a year (monitored since 2021) Investigation Env Act (SODRP) investigation ongoing Improvement Env Act (SODRP) improvement ongoing Volume & pollution Estimate from 193 hours spilling →	Stanton tributary River Sapist	24	193	down 41%	100%
Long Buckby Sp Storm discharge at pumping station EA ID / permit AWS00767 · AWNNF2431 Outlet location SP6317067060 (OS grid reference) · View on Apple Maps WFD catchment Tributary of Whilton Branch (GB105032045400) 2024 spills / hours 12 / 84 Long-term average 17.5 spills a year (monitored since 2024) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 192 hours spilling →	River Nene	23	192	up 92%	100%

Sewage treatment works

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

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