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

010k20k30k40kJan 2025: 37,152 hours spillingJanFeb 2025: 23,894 hours spillingFebMar 2025: 7,398 hours spillingMarApr 2025: 2,669 hours spillingAprMay 2025: 809 hours spillingMayJun 2025: 213 hours spillingJunJul 2025: 854 hours spillingJulAug 2025: 258 hours spillingAugSep 2025: 754 hours spillingSepOct 2025: 1,381 hours spillingOctNov 2025: 8,586 hours spillingNovDec 2025: 23,856 hours spillingDec
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.

OverflowDischarges toSpills 2025Hours 2025Spills vs 2024Monitor uptime
Iver North WwTW
Storm tank at sewage works
Sewage works
Iver North
Company site name
Iver (North) STW
EA ID / permit
TWL00245 · CNTD.0079
Outlet location
TQ0434080810 (OS grid reference) · View on Apple Maps
WFD catchment
Colne Brook (GB106039023010)
2024 spills / hours
1 / 6.0
Long-term average
5.0 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Colne Brook 0 0.0 down 100% 100%
Jews Row Wandle Valley CSO
Overflow on sewer network
Company site name
Jews Row Wandle Valley storm relief
EA ID / permit
TWL00423 · CSAB.0546
Outlet location
TQ2594075450 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES UPPER (GB530603911403)
2024 spills / hours
2 / 5.5
Long-term average
4.2 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
R.Thames ( Tidal ) 0 0.0 down 100% 94%
Junction Crane Valley/Bath Rd CSO
Overflow on sewer network
Company site name
Sso, junction crane valley/bathroadse
EA ID / permit
TWL00382 · TEMP.2904
Outlet location
TQ1005077010 (OS grid reference) · View on Apple Maps
WFD catchment
Crane (GB106039023030)
2024 spills / hours
0 / 0.0
Long-term average
0.5 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Crane 0 0.0 no change 100%
Kempsford STW
Storm tank at sewage works
Sewage works
Kempsford
Company site name
Kempsford STW
EA ID / permit
TWL00246 · CATM.3520
Outlet location
SU1660097500 (OS grid reference) · View on Apple Maps
WFD catchment
Dudgrove Brook (GB106039023110)
2024 spills / hours
8 / 97
Long-term average
2.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Dudgrove Stream 0 0.0 down 100% 100%
Kendal Road (1), Cullingworth Road
Overflow on sewer network
Company site name
Kendal road (1), cullingworth road
EA ID / permit
TWL00247 · TEMP.2708
Outlet location
TQ2255085531 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Brent (GB106039023590)
2024 spills / hours
0 / 0.0
Long-term average
0.6 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Mitchell Brook 0 0.0 no change 98%
Kew Transfer Pumping Station
Storm discharge at pumping station
Company site name
Kew Transfer SPS
EA ID / permit
TWL00248 · CASM.0249
Outlet location
TQ1980077000 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES UPPER (GB530603911403)
2024 spills / hours
0 / 0.0
Long-term average
4.9 spills a year (monitored since 2019)
Monitor below 90%
Comms failure / issue · Resolved - Apr
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Tidal River Thames 0 0.0 no change 77%
Kilda Road
Storm discharge at pumping station
Company site name
Kilda Road (Highworth) SPS
EA ID / permit
TWL00249 · TEMP.1250
Outlet location
SU1950093000 (OS grid reference) · View on Apple Maps
WFD catchment
Westrop Brook (GB106039023711)
2024 spills / hours
0 / 0.0
Long-term average
0.1 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Westrop Brook 0 0.0 no change 96%
Kimpton Road CSO
Overflow on sewer network
Company site name
Kimpton road (vauxhall rd)
EA ID / permit
TWL00250 · CANM.0473
Outlet location
TL1093019980 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (from Luton to Luton Hoo Lakes) (GB106038033391)
2024 spills / hours
3 / 3.5
Long-term average
0.8 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
The River Lee 0 0.0 down 100% 100%
Kingston Main
Storm discharge at pumping station
Company site name
Kingston Main SPS
EA ID / permit
TWL00258 · TEMP.1273
Outlet location
TQ1780069601 (OS grid reference) · View on Apple Maps
WFD catchment
Thames (Egham to Teddington) (GB106039023232)
2024 spills / hours
0 / 0.0
Long-term average
1.6 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Thames 0 0.0 no change 100%
Long Crendon WwTW
Storm tank at sewage works
Sewage works
Long Crendon
Company site name
Long Crendon STW
EA ID / permit
TWL00276 · CTCR.1781
Outlet location
SP6998008380 (OS grid reference) · View on Apple Maps
WFD catchment
Thame (Aylesbury to Scotsgrove Brook) (GB106039030370)
2024 spills / hours
19 / 85
Long-term average
4.4 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Crendon Stream 0 0.0 down 100% 100%
Longstone Ave, Drayton Road
Overflow on sewer network
Company site name
Longstone ave, drayton road
EA ID / permit
TWL00279 · TEMP.2749
Outlet location
TQ2198083830 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Brent (GB106039023590)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Brent 0 0.0 no change 99%
Maidenhead
Storm tank at sewage works
Sewage works
Maidenhead
Company site name
Maidenhead STW
EA ID / permit
TWL00287 · TEMP.2757
Outlet location
SU8950080600 (OS grid reference) · View on Apple Maps
WFD catchment
Maidenhead Ditch (GB106039023511)
2024 spills / hours
2 / 16
Long-term average
2.5 spills a year (monitored since 2018)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Maidenhead Ditch 0 0.0 down 100% 100%
Manor Farm
Storm discharge at pumping station
Company site name
Manor Farm Road (Sydenham) SPS
EA ID / permit
TWL00289 · TEMP.1450
Outlet location
SP7280001900 (OS grid reference) · View on Apple Maps
WFD catchment
Chinor Brook and Sydenham Brook (GB106039023850)
2024 spills / hours
4 / 60
Long-term average
1.4 spills a year (monitored since 2019)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
Sydenham Stream 0 0.0 down 100% 100%
Markfield Park CSO / Stonebridge Bk
Overflow on sewer network
Company site name
Stonebridge brook
EA ID / permit
TWL00291 · CANM.0907
Outlet location
TQ3447088700 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (Tottenham Locks to Bow Locks/Three Mills Locks) (GB106038077852)
2024 spills / hours
3 / 4.0
Long-term average
1.1 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Lee 0 0.0 down 100% 100%
Marsh Lane Bridge, Taplow
Storm discharge at pumping station
Company site name
Marsh Lane (Taplow) SPS
EA ID / permit
TWL00295 · TEMP.1471
Outlet location
SU9180079900 (OS grid reference) · View on Apple Maps
WFD catchment
Roundmoor Ditch and Boveney Ditch (GB106039023540)
2024 spills / hours
0 / 0.0
Long-term average
0.7 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Boveney Ditch 0 0.0 no change 99%
Mulberry Court, Hall Road
Overflow on sewer network
Company site name
Melford Road, London, E11
EA ID / permit
TWL00650 · TEMP.2801
Outlet location
TQ3892085790 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (Tottenham Locks to Bow Locks/Three Mills Locks) (GB106038077852)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Hennikers Ditch 0 0.0 no change 99%
Joyce Green West Syphon’s
Overflow on sewer network
EA ID / permit
TWL00800 · Permit applied for
Outlet location
TQ5379675468 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
3 / 7.9
Long-term average
1.5 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
0 0.0 down 100% 98%
Peterborough Road Xx
Overflow on sewer network
EA ID / permit
TWL00684 · Permit applied for
Outlet location
TQ3776886260 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (Tottenham Locks to Bow Locks/Three Mills Locks) (GB106038077852)
2024 spills / hours
6 / 3.4
Long-term average
2.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 100%
Brent Cross Flyover
Overflow on sewer network
EA ID / permit
TWL00486 · Permit applied for
Outlet location
TQ2351387940 (OS grid reference) · View on Apple Maps
WFD catchment
Dollis Brook and Upper Brent (GB106039022980)
2024 spills / hours
0 / 0.0
Long-term average
1.7 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 99%
Knightsbridge Road, Camberley
Overflow on sewer network
EA ID / permit
TWL00627 · Permit applied for
Outlet location
SU8635959405 (OS grid reference) · View on Apple Maps
WFD catchment
Blackwater (Hawley to Whitewater confluence at Bramshill) (GB106039017290)
2024 spills / hours
2 / 2.4
Long-term average
1.0 spills a year (monitored since 2023)
Monitor below 90%
Comms failure / issue · Resolved - Sep
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
0 0.0 down 100% 66%
Somerset Road, Wimbledon
Overflow on sewer network
EA ID / permit
TWL00715 · Permit applied for
Outlet location
TQ2455671974 (OS grid reference) · View on Apple Maps
WFD catchment
Wandle (Croydon to Wandsworth) and the Graveney (GB106039023460)
2024 spills / hours
2 / 2.3
Long-term average
1.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 100%
Church Road
Overflow on sewer network
EA ID / permit
TWL00519 · Permit applied for
Outlet location
TQ2455671974 (OS grid reference) · View on Apple Maps
WFD catchment
Wandle (Croydon to Wandsworth) and the Graveney (GB106039023460)
2024 spills / hours
2 / 2.0
Long-term average
1.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 100%
Dunstable Road - Beech Road CSO Xx
Overflow on sewer network
EA ID / permit
TWL00549 · 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
3 / 1.5
Long-term average
1.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 100%
Dunstable Road - Francis Street
Overflow on sewer network
EA ID / permit
TWL00551 · Permit applied for
Outlet location
TL0888321679 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (from Luton to Luton Hoo Lakes) (GB106038033391)
2024 spills / hours
3 / 1.5
Long-term average
1.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 96%
Jnc Biscot Road - Lansdowne Road
Overflow on sewer network
EA ID / permit
TWL00619 · Permit applied for
Outlet location
TL0875122111 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (from Luton to Luton Hoo Lakes) (GB106038033391)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 99%
Mornington Crescent
Overflow on sewer network
EA ID / permit
TWL00656 · Permit applied for
Outlet location
TQ1044575804 (OS grid reference) · View on Apple Maps
WFD catchment
Crane (GB106039023030)
2024 spills / hours
2 / 1.5
Long-term average
0.7 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 100%
George Street - King Street
Overflow on sewer network
EA ID / permit
TWL00584 · 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
1 / 0.8
Long-term average
0.7 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 100%
Carlton Cres Jnc Blenheim Cres
Overflow on sewer network
EA ID / permit
TWL00503 · Permit applied for
Outlet location
TL0859023049 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (from Luton to Luton Hoo Lakes) (GB106038033391)
2024 spills / hours
2 / 0.4
Long-term average
0.7 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 93%
Dunstable Road - Beech Road
Overflow on sewer network
EA ID / permit
TWL00550 · 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
2 / 0.3
Long-term average
0.7 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 100%
George Street - Wellington Street
Overflow on sewer network
EA ID / permit
TWL00585 · 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
1 / 0.1
Long-term average
0.3 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 down 100% 100%
Alperton Lane
Overflow on sewer network
EA ID / permit
TWL00475 · Unpermitted
Outlet location
TQ1758282968 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Brent (GB106039023590)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 93%
Lincoln Road CSO
Overflow on sewer network
EA ID / permit
TWL00636 · Permit applied for
Outlet location
TQ3365995544 (OS grid reference) · View on Apple Maps
WFD catchment
Salmon Brook upstream Deephams STW (GB106038027960)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
0 0.0 no change 100%
Field End Road (east)
Overflow on sewer network
EA ID / permit
TWL00579 · Unpermitted
Outlet location
TQ1185786922 (OS grid reference) · View on Apple Maps
WFD catchment
Yeading Brook (GB106039023051)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 100%
Gordon Road
Overflow on sewer network
EA ID / permit
TWL00588 · Unpermitted
Outlet location
TQ2467191223 (OS grid reference) · View on Apple Maps
WFD catchment
Dollis Brook and Upper Brent (GB106039022980)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 100%
Xx Biscot Road
Overflow on sewer network
EA ID / permit
TWL00669 · Permit applied for
Outlet location
TL0873422349 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (from Luton to Luton Hoo Lakes) (GB106038033391)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 100%
Netherlands Road CSO
Overflow on sewer network
EA ID / permit
TWL00662 · Unpermitted
Outlet location
TQ2729295226 (OS grid reference) · View on Apple Maps
WFD catchment
Pymmes Brook upstream Salmon Brook confluence (GB106038027940)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 100%
Conolly Road Hanwell
Overflow on sewer network
EA ID / permit
TWL00528 · Permit applied for
Outlet location
TQ1508080310 (OS grid reference) · View on Apple Maps
WFD catchment
Lower Brent (GB106039023590)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 100%
Pavilion in Roxbourne Park
Overflow on sewer network
EA ID / permit
TWL00683 · Permit applied for
Outlet location
TQ1218387291 (OS grid reference) · View on Apple Maps
WFD catchment
Yeading Brook (GB106039023051)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 96%
Jnc Frederick Street & William Street
Overflow on sewer network
EA ID / permit
TWL00620 · Permit applied for
Outlet location
TL0880321890 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (from Luton to Luton Hoo Lakes) (GB106038033391)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 100%
Well Hall Road Eltham
Overflow on sewer network
EA ID / permit
TWL00758 · Permit applied for
Outlet location
TQ4123974833 (OS grid reference) · View on Apple Maps
WFD catchment
Quaggy (GB106039023290)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2023)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
0 0.0 no change 100%
Newmans Lane
Storm discharge at pumping station
Company site name
Newman Lane (Alton) SPS
EA ID / permit
TWL00310 · TEMP.1580
Outlet location
SU7260039900 (OS grid reference) · View on Apple Maps
WFD catchment
North Wey at Alton (GB106039017800)
2024 spills / hours
16 / 57
Long-term average
11.1 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Wey 0 0.0 down 100% 100%
Norfolk Street CSO
Overflow on sewer network
Company site name
Norfolk street
EA ID / permit
TWL00312 · CSAB.0540
Outlet location
TQ3097080760 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
10 / 23
Long-term average
4.3 spills a year (monitored since 2020)
Investigation
No investigation activity in reporting period
Improvement
No improvement action in reporting period
R.Thames ( Tidal ) 0 0.0 down 100% 100%
Park Town CSO
Overflow on sewer network
Company site name
Park town south & west, luton
EA ID / permit
TWL00325 · CANM.0549
Outlet location
TL1001020570 (OS grid reference) · View on Apple Maps
WFD catchment
Lee (from Luton to Luton Hoo Lakes) (GB106038033391)
2024 spills / hours
1 / 0.5
Long-term average
0.0 spills a year (monitored since 2018)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Lee 0 0.0 down 100% 100%
Passfield SPS
Storm discharge at pumping station
Company site name
Passfield (Bramshott) SPS
EA ID / permit
TWL00326 · CASM.0309
Outlet location
SU8204034440 (OS grid reference) · View on Apple Maps
WFD catchment
South Wey (Haslemere to Bordon) (GB106039017700)
2024 spills / hours
0 / 0.0
Long-term average
1.4 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 no change 100%
Pauls Pier Combined Sewer Overflow
Overflow on sewer network
Company site name
Pauls pier
EA ID / permit
TWL00327 · TEMP.2968
Outlet location
TQ3200080810 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
66 / 118
Long-term average
56.6 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 down 100% 96%
Pinkham Way CSO
Overflow on sewer network
Company site name
Pinkham way storm sewage o/f, london
EA ID / permit
TWL00330 · CSAC.1088
Outlet location
TQ2867091680 (OS grid reference) · View on Apple Maps
WFD catchment
Pymmes Brook upstream Salmon Brook confluence (GB106038027940)
2024 spills / hours
1 / 2.0
Long-term average
1.7 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Bounds Green Brook 0 0.0 down 100% 100%
Priory Road, Dartford (Foul)
Storm discharge at pumping station
Company site name
Priory Road South (Dartford) SPS
EA ID / permit
TWL00335 · TEMP.1739
Outlet location
TQ5390074600 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
0 / 0.0
Long-term average
0.3 spills a year (monitored since 2019)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Darent 0 0.0 no change 100%
Puller Road/Calvert Road CSO
Overflow on sewer network
Company site name
Puller rd/calvert rd storm, barnet
EA ID / permit
TWL00141 · TEMP.2838
Outlet location
TQ2399097160 (OS grid reference) · View on Apple Maps
WFD catchment
Colne (upper east arm including Mimshall Brook) (GB106039029850)
2024 spills / hours
0 / 0.0
Long-term average
0.0 spills a year (monitored since 2020)
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
Kitts End Stream 0 0.0 no change 97%
Ramsbury Wastewater Treatment Works
Storm tank at sewage works
Sewage works
Ramsbury
Company site name
Ramsbury STW
EA ID / permit
TWL00340 · CSSC.2353
Outlet location
SU2885071770 (OS grid reference) · View on Apple Maps
WFD catchment
Aldbourne (GB106039023200)
2024 spills / hours
23 / 91
Long-term average
3.8 spills a year (monitored since 2018)
Monitor below 90%
Comms failure / issue · Not Applicable - Ongoing investigation
Investigation
Env Act (SODRP) investigation ongoing
Improvement
No improvement action in reporting period
River Kennet 0 0.0 down 100% 86%
Ratcliffe Highway Limekiln CSO
Overflow on sewer network
Company site name
Ratcliffe highway limekiln
EA ID / permit
TWL00341 · TEMP.2864
Outlet location
TQ3601080810 (OS grid reference) · View on Apple Maps
WFD catchment
THAMES MIDDLE (GB530603911402)
2024 spills / hours
0 / 0.0
Long-term average
12.9 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%

Sewage treatment works

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

← All water companies · Contains Environment Agency data licensed under the Open Government Licence v3.0. How to read the data.