Storm overflow register · 2025 annual return

Thames Water storm overflows, 2025

Thames Water reported 581 storm overflows in England for 2025. Together they recorded 9,189 spills over 107,822 hours, an average of 15.8 spills per overflow against 20.4 across England. That ranks 3 of 10 companies, where 1 is the fewest spills per overflow. Counting the same overflows in both years, spills were down 60% on 2024.

135 overflows did not spill · 28 spilled more than 60 times · 548 had monitors working for 90% of the year or more · 233 sewage treatment works with overflows

Hours spilling by month, 2025

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

All Thames 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
North East St CSO Overflow on sewer network Company site name Ne storm relief shadwell, king edward mem park EA ID / permit TWL00658 · TEMP.2804 Outlet location TQ3562080670 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 16 / 62 Long-term average 17.0 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.4 hours spilling →	Tidal Thames	2	1.4	down 88%	100%
Tubney SPS Xx Storm discharge at pumping station EA ID / permit TWL00806 · Permit applied for Outlet location SU4424798788 (OS grid reference) · View on Apple Maps WFD catchment Frilford and Marcham Brook (GB106039023420) 2024 spills / hours 7 / 47 Long-term average 2.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.4 hours spilling →		1	1.4	down 86%	100%
Oak Hill Park CSO Overflow on sewer network EA ID / permit TWL00670 · Permit applied for Outlet location TQ2801894673 (OS grid reference) · View on Apple Maps WFD catchment Pymmes Brook upstream Salmon Brook confluence (GB106038027940) 2024 spills / hours 5 / 10 Long-term average 2.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →		2	1.3	down 60%	100%
Chigwell Road, Woodford Green Overflow on sewer network Company site name WINN VALLEY SPS LB REDBRIDGE 8 (THE VALE) TQ40912012 CSO EA ID / permit TWL00789 · CETR.0232 Outlet location TQ4160091300 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 19 / 3.7 Long-term average 12.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	Roding	7	1.3	down 63%	96%
Hillside Avenue CSO Overflow on sewer network Company site name Hillside avenue EA ID / permit TWL00228 · EPRAB3890AS Outlet location TQ4192092190 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 2 / 1.5 Long-term average 7.3 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.3 hours spilling →	The River Roding	2	1.3	no change	97%
Near Sezincote Lodge Overflow on sewer network EA ID / permit TWL00804 · Unpermitted Outlet location SP1850532579 (OS grid reference) · View on Apple Maps WFD catchment Evenlode (Source to Four Shires S) and Longborough Stream (GB106039037420) 2024 spills / hours 28 / 131 Long-term average 13.7 spills a year (monitored since 2023) Monitor below 90% Comms failure / issue · Resolved - Jan Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.2 hours spilling →		4	1.2	down 86%	77%
Thrale Road Overflow on sewer network EA ID / permit TWL00747 · Permit applied for Outlet location TQ2888870526 (OS grid reference) · View on Apple Maps WFD catchment Wandle (Croydon to Wandsworth) and the Graveney (GB106039023460) 2024 spills / hours 29 / 118 Long-term average 10.3 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.2 hours spilling →		2	1.2	down 93%	100%
Oakley Road Overflow on sewer network EA ID / permit TWL00671 · Permit applied for Outlet location TL0684324187 (OS grid reference) · View on Apple Maps WFD catchment Lee (from Luton to Luton Hoo Lakes) (GB106038033391) 2024 spills / hours 7 / 6.7 Long-term average 4.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.2 hours spilling →		4	1.2	down 43%	100%
Church Street CSO Overflow on sewer network Company site name Church street sewer EA ID / permit TWL00100 · CSAB.0574 Outlet location TQ2711077550 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 4 / 3.4 Long-term average 5.3 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 1.2 hours spilling →	R.Thames ( Tidal )	2	1.2	down 50%	100%
Kingsway (Near Railway Bridge) Overflow on sewer network EA ID / permit TWL00624 · Permit applied for Outlet location TL0903921499 (OS grid reference) · View on Apple Maps WFD catchment Lee (from Luton to Luton Hoo Lakes) (GB106038033391) 2024 spills / hours 3 / 1.7 Long-term average 1.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.1 hours spilling →		2	1.1	down 33%	100%
Chigwell Road, Woodford Green Overflow on sewer network Company site name WINN VALLEY SPS LB REDBRIDGE 1 (MALLARDS ROAD) TQ40918001 CSO EA ID / permit TWL00515 · CETR.0232 Outlet location TQ4160091300 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 10 / 3.2 Long-term average 9.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.0 hours spilling →	Roding	4	1.0	down 60%	100%
Ockham Road South CSO Overflow on sewer network Company site name Ockham road south foul sewer overflow EA ID / permit TWL00190 · CTCR.2050 Outlet location TQ0946053880 (OS grid reference) · View on Apple Maps WFD catchment Stratford Brook (GB106039017890) 2024 spills / hours 4 / 9.5 Long-term average 1.0 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.0 hours spilling →	Culverted Ockham Brook	1	1.0	down 75%	100%
Chigwell Road, Woodford Green Overflow on sewer network Company site name WINN VALLEY SPS LB REDBRIDGE 2 (ST BARNABAS ROAD) TQ40919012 CSO EA ID / permit TWL00783 · CETR.0232 Outlet location TQ4160091300 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 12 / 6.1 Long-term average 8.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 1.0 hours spilling →	Roding	3	1.0	down 75%	100%
Elmcroft Avenue, Overflow on sewer network Company site name CHIGWELL ROAD TQ4189091F CSO EA ID / permit TWL00791 · CANM.0910 Outlet location TQ4140089300 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 5 / 3.1 Long-term average 4.3 spills a year (monitored since 2023) 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 0.9 hours spilling →	The River Roding	3	0.9	down 40%	69%
Elmcroft Avenue, Overflow on sewer network Company site name ELMCROFT AVENUE (COLVIN GARDENS) TQ40899103 CSO EA ID / permit TWL00793 · CANM.0910 Outlet location TQ4140089300 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 7 / 2.5 Long-term average 9.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.8 hours spilling →	The River Roding	3	0.8	down 57%	100%
Church Hill Road Overflow on sewer network Company site name Church hill road, barnet EA ID / permit TWL00099 · CTCR.1998 Outlet location TQ2730095230 (OS grid reference) · View on Apple Maps WFD catchment Pymmes Brook upstream Salmon Brook confluence (GB106038027940) 2024 spills / hours 4 / 2.8 Long-term average 2.3 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.8 hours spilling →	Trib of Pymmes Brook	1	0.8	down 75%	100%
Granville Road Overflow on sewer network EA ID / permit TWL00591 · Permit applied for Outlet location TQ2459786943 (OS grid reference) · View on Apple Maps WFD catchment Dollis Brook and Upper Brent (GB106039022980) 2024 spills / hours 2 / 1.0 Long-term average 1.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.8 hours spilling →		1	0.8	down 50%	100%
Beckton STW Inlet overflow at sewage works Sewage works Beckton Company site name Beckton STW EA ID / permit TWL00029 · CSSA.0360 Outlet location TQ4524081610 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 13 / 24 Long-term average 9.9 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.7 hours spilling →	Thames Tidal	2	0.7	down 85%	100%
Chigwell Road, Woodford Green Overflow on sewer network Company site name WINN VALLEY SPS LB REDBRIDGE 3 (CAVENDISH AVENUE) TQ40917002 CSO EA ID / permit TWL00784 · CETR.0232 Outlet location TQ4160091300 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 3 / 1.2 Long-term average 3.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.7 hours spilling →	Roding	3	0.7	no change	100%
Essex Street CSO Overflow on sewer network Company site name Temple place essex street EA ID / permit TWL00407 · TEMP.2583 Outlet location TQ3112080790 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 13 / 30 Long-term average 5.7 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.7 hours spilling →	Tidal Thames	1	0.7	down 92%	100%
Surface Water Sewer Overflow on sewer network Company site name Dartnell park, byfleet EA ID / permit TWL00739 · CTCR.1928 Outlet location TQ0560062100 (OS grid reference) · View on Apple Maps WFD catchment Wey Navigation (Pyrford reach) (GB106039017910) 2024 spills / hours 26 / 258 Long-term average 11.7 spills a year (monitored since 2023) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.6 hours spilling →	Rive Ditch	1	0.6	down 96%	99%
Elmcroft Avenue, Overflow on sewer network Company site name ELMCROFT AVENUE (COWLEY ROAD) TQ40885906 CSO EA ID / permit TWL00795 · CANM.0910 Outlet location TQ4140089300 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 3 / 0.9 Long-term average 4.3 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	The River Roding	1	0.5	down 67%	100%
Bakers Farm, High Wych Storm discharge at pumping station Company site name Bakers Farm (Sawbridgeworth) SPS EA ID / permit TWL00023 · TEMP.0382 Outlet location TL4620014200 (OS grid reference) · View on Apple Maps WFD catchment Stort and Navigation, Harlow to Lee (GB106038033282) 2024 spills / hours 7 / 19 Long-term average 10.5 spills a year (monitored since 2020) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	High Wych Ditch	1	0.5	down 86%	100%
CSO at Mapleton Road/Brathway Road Overflow on sewer network Company site name Mapleton road EA ID / permit TWL00134 · TEMP.2790 Outlet location TQ2565074320 (OS grid reference) · View on Apple Maps WFD catchment Wandle (Croydon to Wandsworth) and the Graveney (GB106039023460) 2024 spills / hours 4 / 4.3 Long-term average 9.7 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	River Wandle	1	0.5	down 75%	100%
District Road Overflow on sewer network Company site name District road EA ID / permit TWL00156 · TEMP.2551 Outlet location TQ1663085090 (OS grid reference) · View on Apple Maps WFD catchment Lower Brent (GB106039023590) 2024 spills / hours 3 / 2.8 Long-term average 2.0 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Wembley Brook	1	0.5	down 67%	100%
Kings Avenue CSO Overflow on sewer network Company site name Kings avenue EA ID / permit TWL00253 · EPRAB3890EX Outlet location TQ4192092190 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 3 / 2.0 Long-term average 3.7 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	The River Roding	1	0.5	down 67%	100%
London Road Storm discharge at pumping station Company site name London Road (Marlborough) SPS EA ID / permit TWL00275 · TEMP.1368 Outlet location SU1930069101 (OS grid reference) · View on Apple Maps WFD catchment Upper Kennet to Marlborough (GB106039023171) 2024 spills / hours 11 / 60 Long-term average 2.3 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Kennet	1	0.5	down 91%	93%
Lyon Park Avenue Overflow on sewer network Company site name Lyon park avenue EA ID / permit TWL00285 · TEMP.2754 Outlet location TQ1834084660 (OS grid reference) · View on Apple Maps WFD catchment Lower Brent (GB106039023590) 2024 spills / hours 3 / 4.3 Long-term average 2.0 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Wembley Brook	1	0.5	down 67%	100%
North West Storm Relief Overflow on sewer network Company site name North west storm relief EA ID / permit TWL00317 · CSAB.0571 Outlet location TQ2303078110 (OS grid reference) · View on Apple Maps WFD catchment THAMES UPPER (GB530603911403) 2024 spills / hours 5 / 5.0 Long-term average 3.4 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	R.Thames ( Tidal )	1	0.5	down 80%	100%
Ratley WwTW Storm tank at sewage works Sewage works Ratley Company site name Ratley STW EA ID / permit TWL00342 · TEMP.2851 Outlet location SP3843047030 (OS grid reference) · View on Apple Maps WFD catchment Sor Brook (Source to Broughton) (GB106039037320) 2024 spills / hours 6 / 21 Long-term average 4.4 spills a year (monitored since 2018) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Sor Brook	1	0.5	down 83%	100%
Westway Close Storm discharge at pumping station Company site name Westway Close (Raynes Park) SPS EA ID / permit TWL00444 · TEMP.2223 Outlet location TQ2280068700 (OS grid reference) · View on Apple Maps WFD catchment Beverley Brook (Motspur Park to Thames) and Pyl Brook at West Barnes (GB106039022850) 2024 spills / hours 3 / 12 Long-term average 5.8 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Old Pyl Ditch	1	0.5	down 67%	100%
Worple Road CSO Overflow on sewer network Company site name Worple road, sw19 EA ID / permit TWL00465 · TEMP.3044 Outlet location TQ2182069890 (OS grid reference) · View on Apple Maps WFD catchment Beverley Brook (Motspur Park to Thames) and Pyl Brook at West Barnes (GB106039022850) 2024 spills / hours 1 / 0.8 Long-term average 2.1 spills a year (monitored since 2019) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.5 hours spilling →	Beverley Brook	1	0.5	no change	100%
Channelsea West Ham PS Overflow on sewer network EA ID / permit TWL00782 · Permit applied for Outlet location TQ3891283247 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 7 / 8.3 Long-term average 4.5 spills a year (monitored since 2023) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →		2	0.4	down 71%	100%
Northern Low Level 1 Overflow on sewer network Company site name (Northern) low level no 1 brook green EA ID / permit TWL00280 · CSAB.0535 Outlet location TQ2304078150 (OS grid reference) · View on Apple Maps WFD catchment THAMES UPPER (GB530603911403) 2024 spills / hours 2 / 3.1 Long-term average 5.7 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →	R.Thames ( Tidal )	1	0.4	down 50%	100%
Empress Avenue Overflow on sewer network EA ID / permit TWL00798 · Permit applied for Outlet location TQ4230486996 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 6 / 4.9 Long-term average 4.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.4 hours spilling →		1	0.4	down 83%	91%
Isle of Dogs Pumping Station CSO Storm discharge at pumping station Company site name Isle of Dogs SWPS EA ID / permit TWL00243 · CSSC.7688 Outlet location TQ3840079700 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 1 / 1.3 Long-term average 3.0 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →	River Thames(Tidal)	1	0.3	no change	100%
Park Street - Bailey Street Overflow on sewer network EA ID / permit TWL00678 · Permit applied for Outlet location TL0989220738 (OS grid reference) · View on Apple Maps WFD catchment Lee (from Luton to Luton Hoo Lakes) (GB106038033391) 2024 spills / hours 16 / 7.2 Long-term average 8.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.3 hours spilling →		1	0.3	down 94%	94%
Goswell Street CSO Overflow on sewer network Company site name Goswell street EA ID / permit TWL00200 · CSAB.0543 Outlet location TQ3245080670 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 2 / 1.0 Long-term average 2.2 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	R.Thames ( Tidal )	2	0.2	no change	95%
Dallow Road Jnc Lyndhurst Road Overflow on sewer network EA ID / permit TWL00544 · Permit applied for Outlet location TL0903921499 (OS grid reference) · View on Apple Maps WFD catchment Lee (from Luton to Luton Hoo Lakes) (GB106038033391) 2024 spills / hours 5 / 1.1 Long-term average 2.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →		2	0.2	down 60%	100%
Queen Street CSO Overflow on sewer network Company site name Queen street EA ID / permit TWL00339 · CSAB.0576 Outlet location TQ2757077670 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 3 / 1.6 Long-term average 2.8 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.2 hours spilling →	R.Thames ( Tidal )	2	0.2	down 33%	100%
Hurstwood Road West Overflow on sewer network EA ID / permit TWL00613 · Permit applied for Outlet location TQ2451189229 (OS grid reference) · View on Apple Maps WFD catchment Dollis Brook and Upper Brent (GB106039022980) 2024 spills / hours 0 / 0.0 Long-term average 1.0 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →		1	0.1	up from 0	100%
Chigwell Road, Woodford Green Overflow on sewer network Company site name WINN VALLEY SPS LB REDBRIDGE 5 (ST ALBANS ROAD) TQ40910111 CSO EA ID / permit TWL00786 · CETR.0232 Outlet location TQ4160091300 (OS grid reference) · View on Apple Maps WFD catchment Lower Roding (Loughton to Thames) (GB106037028181) 2024 spills / hours 2 / 0.6 Long-term average 10.0 spills a year (monitored since 2023) Monitor below 90% Installation set-up/design issue · Resolved - Jun Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Roding	1	0.1	down 50%	72%
Henley Road CSO Overflow on sewer network Company site name Henley road EA ID / permit TWL00221 · TEMP.2679 Outlet location TQ4292079730 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 2 / 9.8 Long-term average 2.0 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →	Woolwich Reach	1	0.1	down 50%	100%
Jnc Portland Road - Churchill Road Overflow on sewer network EA ID / permit TWL00621 · Permit applied for Outlet location TL0903921499 (OS grid reference) · View on Apple Maps WFD catchment Lee (from Luton to Luton Hoo Lakes) (GB106038033391) 2024 spills / hours 3 / 1.6 Long-term average 1.7 spills a year (monitored since 2023) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period Volume & pollution Estimate from 0.1 hours spilling →		1	0.1	down 67%	100%
15 Coldharbour Lane, Bushey Overflow on sewer network Company site name 15 coldharbour lane, bushey EA ID / permit TWL00001 · TEMP.2331 Outlet location TQ1390095400 (OS grid reference) · View on Apple Maps WFD catchment Colne (from Confluence with Ver to Gade) (GB106039029840) 2024 spills / hours 0 / 0.0 Long-term average 2.3 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Colne Brook	0	0.0	no change	100%
Abbey Mills PS CSO Storm discharge at pumping station Company site name Abbey Mills A Storm SPS EA ID / permit TWL00003 · CSAB.0530 Outlet location TQ3885083140 (OS grid reference) · View on Apple Maps WFD catchment THAMES MIDDLE (GB530603911402) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2020) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period	R.Lee (Chanelsea River South)	0	0.0	no change	100%
Allendale Road Overflow on sewer network Company site name Allendale road EA ID / permit TWL00008 · TEMP.2367 Outlet location TQ1648084910 (OS grid reference) · View on Apple Maps WFD catchment Lower Brent (GB106039023590) 2024 spills / hours 0 / 0.0 Long-term average 0.3 spills a year (monitored since 2018) Investigation Env Act (SODRP) investigation ongoing Improvement No improvement action in reporting period	Wembley Brook	0	0.0	no change	92%
Anyand Park Road, Twickenham Overflow on sewer network Company site name Anyand park road, twickenham EA ID / permit TWL00012 · TEMP.2369 Outlet location TQ1650073900 (OS grid reference) · View on Apple Maps WFD catchment THAMES UPPER (GB530603911403) 2024 spills / hours 0 / 0.0 Long-term average 0.0 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period	Tidal Thames	0	0.0	no change	100%
Arford Pumping Station Storm discharge at pumping station Company site name Arford SPS EA ID / permit TWL00015 · CASM.0402 Outlet location SU8273036880 (OS grid reference) · View on Apple Maps WFD catchment South Wey (Bordon to River Slea confluence) (GB106039017720) 2024 spills / hours 1 / 0.8 Long-term average 0.9 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period	River Wey	0	0.0	down 100%	96%
Aston Le Walls WwTW Storm tank at sewage works Sewage works Aston Le Walls Company site name Aston Le Walls STW EA ID / permit TWL00018 · CNTD.0040 Outlet location SP4940051000 (OS grid reference) · View on Apple Maps WFD catchment Highfurlong Brook (to Cherwell) (GB106039042660) 2024 spills / hours 7 / 40 Long-term average 13.1 spills a year (monitored since 2019) Investigation No investigation activity in reporting period Improvement No improvement action in reporting period	Tributary of Highfurlong Brook	0	0.0	down 100%	99%

Sewage treatment works

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

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