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Home › Rivers › Taff

Taff water levels

6 gauges from Merthyr Tydfil No1 River Station to Western Avenue River Station. None is above its typical high. 16 storm overflows upstream are discharging now. Gauges in Cardiff, Merthyr Tydfil, Rhondda Cynon Taf; levels are checked every 15 minutes.

6gauges
0above normal
16overflows upstream discharging

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Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Merthyr Tydfil No1 River StationMerthyr0.64 m 16m agoWithin its typical range▼
Troedyrhiw River Station 5.8 km by riverTroedyrhiw0.75 m 16m agoWithin its typical range▼
Fiddlers Elbow River Station 10.0 km by river—0.79 m 31m agoWithin its typical range▼
Pontypridd River Station 7.8 km by riverPontypridd1.17 m 31m agoWithin its typical range▼
Upper Boat River Station 4.3 km by river—1.21 m 16m agoWithin its typical range—
Western Avenue River Station 12.6 km by river—1.41 m 16m agoWithin its typical range▼

Stations are listed from source to mouth as the water flows, traced on the river map (OS Open Rivers) and the Environment Agency’s own links between its gauges. A distance “by river” is along the river, and is shown only where the map traces the path.

Contains OS data © Crown copyright and database rights 2026.

Gauged tributaries

Streams and rivers with a gauge whose water joins the Taff above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.

3 gauged tributaries, 9 gauges

Cynon

Joins the Taff between Fiddlers Elbow River Station and Pontypridd River Station, no more than 7.9 km by river above Pontypridd River Station.

Hirwaun River Station0.37 m 16m agoWithin its typical range
6.3 km by river
Aberdare River Station0.38 m 16m agoWithin its typical range
6.2 km by river
Mountain Ash River Station1.03 m 31m agoWithin its typical range
5.3 km by river
Abercynon River Station0.68 m 16m agoWithin its typical range

Its water passes Pontypridd River Station and every gauge below it on the Taff. It does not pass Fiddlers Elbow River Station or the gauges above it.

Rhondda

Joins the Taff between Fiddlers Elbow River Station and Pontypridd River Station, no more than 3.3 km by river above Pontypridd River Station.

Trehafod River Station0.72 m 31m agoWithin its typical range

Its water passes Pontypridd River Station and every gauge below it on the Taff. It does not pass Fiddlers Elbow River Station or the gauges above it.

Gauged streams joining the Rhondda

Where the Taff goes

No gauge below Western Avenue River Station is known on the river map.

Tributaries and where they join are traced on the river map (OS Open Rivers, edition 2026-04) and the Environment Agency’s links between its gauges. The map holds distances between gauges, not the junctions themselves, so a junction is placed between two gauges, and no further up than the tributary’s own lowest gauge. Contains OS data © Crown copyright and database rights 2026.

Streams without a gauge

Named streams on the river map that flow into the Taff and have no gauge of their own. Each has a page with what is known about it: the next gauge downstream, and any storm overflows or water-sampling points placed on it.

  • Bargod Taf (joins about 1.7 km above Fiddlers Elbow River Station)
  • Nant Cae-dudwg (joins about 3.4 km above Pontypridd River Station)
  • Nant Clydach (joins about 4.3 km above Pontypridd River Station)
  • Nant Morlais (joins about 5.3 km above Troedyrhiw River Station)

Storm overflows upstream

177 storm overflows are traced upstream of Western Avenue River Station, the Taff’s lowest gauge on the river map: on the Taff itself, on its gauged tributaries, and on smaller streams that join above there.

  • 16 report discharging now
  • 151 not discharging
  • 10 offline or silent: 10 monitor offline, 0 status unknown, 0 no live feed

Official figures for 2025, for the overflows traced upstream of Western Avenue River Station: 7,306 spills over 38,505 hours in total, across the 170 that have a figure. 2 had no usable monitor data that year; 5 have no 2025 figure.

Each overflow is listed in the stretch above the first gauge its water reaches, from the source down, as on the Gauges tab. A stretch of the Taff includes the smaller streams that join it there. Every overflow traced is listed here, each stretch in full. Back to the short lists →

Above Merthyr Tydfil No1 River Station, the Taff’s highest gauge3 overflows · 2 discharging now
  • Pontsticill WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Taff · 7.5 km by river above Merthyr Tydfil No1 River Station · 2025: 90 spills, 1,412 h
  • Pont-Y-Cefn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Taf Fechan · 1.5 km by river above Merthyr Tydfil No1 River Station · 2025: 28 spills, 20 h
  • Cyfarthfa Road Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Taff · 190 m by river above Merthyr Tydfil No1 River Station · 2025: 37 spills, 45 h
Between Merthyr Tydfil No1 River Station and Troedyrhiw River Station8 overflows
Between Troedyrhiw River Station and Fiddlers Elbow River Station8 overflows
Between Fiddlers Elbow River Station and Pontypridd River Station27 overflows · 2 discharging now
  • Clydach Road Ynysybwl Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Clydach · 8.5 km by river above Pontypridd River Station · 2025: 47 spills, 228 h
  • Clydach Terrace Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Clydach · 7.7 km by river above Pontypridd River Station · 2025: 34 spills, 88 h
  • River Row Abercynon Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Cynon · 7.4 km by river above Pontypridd River Station · 2025: 118 spills, 1,541 h
  • Glynmynach Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Clydach · 7.3 km by river above Pontypridd River Station · 2025: 98 spills, 521 h
  • Martins Terrace Abercynon Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 7.0 km by river above Pontypridd River Station · 2025: 7 spills, 4.5 h
  • Robert Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Clydach · 6.9 km by river above Pontypridd River Station · 2025: 90 spills, 553 h
  • Abercynon Wood Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 6.6 km by river above Pontypridd River Station · 2025: 66 spills, 703 h
  • Old Parish Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Clydach · 6.2 km by river above Pontypridd River Station · 2025: 83 spills, 253 h
  • Cynon WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 4.5 km by river above Pontypridd River Station · 2025: 64 spills, 779 h
  • Cilfynydd WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Taff · 4.4 km by river above Pontypridd River Station · 2025: 112 spills, 1,698 h
  • Park Place Clifnydd 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Cae-Dudwg · 4.3 km by river above Pontypridd River Station · 2025: 9 spills, 8.3 h
  • Ty Mawr Road Pontypridd Overflow Not discharging
    Dwr Cymru Welsh Water · into River Rhondda · 2.8 km by river above Pontypridd River Station · 2025: 5 spills, 1.8 h
  • Ynysybwl Road Taff Vale Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 2.8 km by river above Pontypridd River Station · 2024: 40 spills, 29 h
  • Maesycoe Lanelay Crescent Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Rhondda · 2.0 km by river above Pontypridd River Station · 2025: 9 spills, 3.8 h
  • Sheppard Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Rhondda · 1.9 km by river above Pontypridd River Station · 2025: 23 spills, 24 h
  • Pwllgwaun Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Rhondda · 1.9 km by river above Pontypridd River Station · 2025: 5 spills, 1.8 h
  • West Street Pontypridd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 1.6 km by river above Pontypridd River Station · 2025: 63 spills, 52 h
  • Sion Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 1.5 km by river above Pontypridd River Station · 2025: 0 spills, 0 h
  • South Of Lee Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Rhondda · 1.5 km by river above Pontypridd River Station · 2025: 92 spills, 419 h
  • Crossbrook Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 1.2 km by river above Pontypridd River Station · 2025: 62 spills, 380 h
  • Pavia Court Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Rhondda · 1.1 km by river above Pontypridd River Station · 2025: 44 spills, 47 h
  • Mill Street Pontypridd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Rhondda · 1.0 km by river above Pontypridd River Station · 2025: 14 spills, 29 h
  • Taff Street Pontypridd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 1.0 km by river above Pontypridd River Station · 2025: 0 spills, 0 h
  • Ynysangharad Park Bridge Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 890 m by river above Pontypridd River Station · 2025: 0 spills, 0 h
  • High Street Pontypridd Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 870 m by river above Pontypridd River Station · 2025: 4 spills, 1.0 h
  • Ynysangharad Park Pontypridd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 550 m by river above Pontypridd River Station · 2025: 93 spills, 217 h
  • Alexandra Road Pontypridd Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 150 m by river above Pontypridd River Station · 2025: 0 spills, 0 h
Cynon, above Hirwaun River Stationjoins the Taff above Pontypridd River Station3 overflows
  • Pontbren Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 2.8 km by river above Hirwaun River Station · 2025: 86 spills, 574 h
  • Bute Place Hirwaun Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 810 m by river above Hirwaun River Station · 2025: 40 spills, 89 h
  • Merthyr Road Bridge Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 100 m by river above Hirwaun River Station · 2025: 88 spills, 449 h
Cynon, above Aberdare River Stationjoins the Taff above Pontypridd River Station11 overflows
  • Trenant 1 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 5.6 km by river above Aberdare River Station · 2025: 66 spills, 153 h
  • Hirwaun Mangoed Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into River Cynon · 5.2 km by river above Aberdare River Station · 2025: no data
  • Erw Las Rear Footpath Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 4.3 km by river above Aberdare River Station · 2025: 52 spills, 177 h
  • Dare Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dare · 2.8 km by river above Aberdare River Station · 2025: 98 spills, 526 h
  • Tan Y Bryn Gardens Llwydcoed Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 2.6 km by river above Aberdare River Station · 2025: 53 spills, 206 h
  • Maes Y Ffion Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant-Y-Derlwyn · 2.3 km by river above Aberdare River Station · 2025: 77 spills, 426 h
  • Trecynon Harriet Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant-Y-Derlwyn · 2.2 km by river above Aberdare River Station · 2025: 0 spills, 0 h
  • Meirion Street Roundabout Trecynon Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 1.6 km by river above Aberdare River Station · 2025: 96 spills, 555 h
  • Glan Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Dare · 1.4 km by river above Aberdare River Station · 2025: 42 spills, 118 h
  • Wellington St No1 Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into River Cynon · 1000 m by river above Aberdare River Station · 2025: 7 spills, 2.0 h
  • Commercial Street Aberdare Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 220 m by river above Aberdare River Station · 2025: 60 spills, 37 h
Cynon, above Mountain Ash River Stationjoins the Taff above Pontypridd River Station19 overflows · 2 discharging now
  • Dean Street Aberdare Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 6.1 km by river above Mountain Ash River Station · 2025: 50 spills, 85 h
  • Station Street Aberdare Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 6.1 km by river above Mountain Ash River Station · 2025: 84 spills, 307 h
  • Cardiff Road Aberaman Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 5.2 km by river above Mountain Ash River Station · 2025: 23 spills, 25 h
  • Well Place Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 5.1 km by river above Mountain Ash River Station · no official annual figure
  • Glancynon Terrace Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Gwawr · 4.7 km by river above Mountain Ash River Station · 2025: 25 spills, 11 h
  • David Street Aberaman Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 4.7 km by river above Mountain Ash River Station · 2025: 2 spills, 4.5 h
  • Pit Place Cwmbach Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 4.6 km by river above Mountain Ash River Station · 2025: 7 spills, 8.3 h
  • Wyndham Crescent Aberaman Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 4.3 km by river above Mountain Ash River Station · 2025: 3 spills, 1.3 h
  • Mikes Field Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Cynon · 4.0 km by river above Mountain Ash River Station · 2025: 121 spills, 1,592 h
  • Sion Terrace Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 3.7 km by river above Mountain Ash River Station · 2025: 19 spills, 51 h
  • Bro Deg Canal Road Junction Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 3.6 km by river above Mountain Ash River Station · 2025: 24 spills, 42 h
  • Aberaman Park West Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Cynon · 3.6 km by river above Mountain Ash River Station · 2025: 112 spills, 1,283 h
  • Cwmbach Maeshyfryd Stoem Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 3.5 km by river above Mountain Ash River Station · 2025: 2 spills, 0.5 h
  • Bro Deg 1 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 3.5 km by river above Mountain Ash River Station · 2025: 52 spills, 151 h
  • Cwmbach Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 3.5 km by river above Mountain Ash River Station · 2025: 3 spills, 10 h
  • Canal Road Cwmbach Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 3.3 km by river above Mountain Ash River Station · 2025: 16 spills, 23 h
  • Park View Terrace Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 3.0 km by river above Mountain Ash River Station · 2025: 7 spills, 3.8 h
  • Low Row Cwmpennar Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of River Cynon · 1.2 km by river above Mountain Ash River Station · 2025: 5 spills, 8.8 h
  • Duffryn Road Mountain Ash Overflow Not discharging
    Dwr Cymru Welsh Water · into River Cynon · 520 m by river above Mountain Ash River Station · 2025: 35 spills, 75 h
Cynon, above Abercynon River Stationjoins the Taff above Pontypridd River Station12 overflows · 1 discharging now
Rhondda, above Trehafod River Stationjoins the Taff above Pontypridd River Station49 overflows · 4 discharging now
Rhondda Fawr, above Tynewydd River Stationjoins the Rhondda3 overflows
Rhondda Fawr, above Gelli River Stationjoins the Rhondda21 overflows · 2 discharging now
Between Pontypridd River Station and Upper Boat River Station8 overflows · 2 discharging now
  • James Street Junction Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 4.0 km by river above Upper Boat River Station · 2025: 35 spills, 24 h
  • Treforest Lewistown Park Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 4.0 km by river above Upper Boat River Station · 2025: 69 spills, 306 h
  • Castle Inn Bridge Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Taff · 3.4 km by river above Upper Boat River Station · 2025: 30 spills, 86 h
  • Llantwit Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 3.1 km by river above Upper Boat River Station · 2025: 6 spills, 2.0 h
  • Cardiff Road Pontypridd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 3.0 km by river above Upper Boat River Station · 2025: 1 spill, 0.3 h
  • Glyn Dwr Avenue Pontypridd Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 2.8 km by river above Upper Boat River Station · 2025: 0 spills, 0 h
  • Lionel Terrace Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 2.3 km by river above Upper Boat River Station · 2025: 32 spills, 154 h
  • Tonteg Road Taff Vale Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Taff · 440 m by river above Upper Boat River Station · 2025: 119 spills, 851 h
Between Upper Boat River Station and Western Avenue River Station5 overflows · 1 discharging now
  • Llys Tripp Gwaelod-Y-Garth Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 8.0 km by river above Western Avenue River Station · 2025: 75 spills, 185 h
  • Ynys Bridge 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 6.6 km by river above Western Avenue River Station · no official annual figure
  • Tongwynlais Recreation Ground Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Taff · 5.8 km by river above Western Avenue River Station · 2025: 69 spills, 1,222 h
  • Westbourne Crescent Bottom Cardiff Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 3.0 km by river above Western Avenue River Station · 2025: 13 spills, 8.5 h
  • Heol Amlwch Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff Via Culverted Watercourse · 460 m by river above Western Avenue River Station · 2025: 9 spills, 17 h · reaches the river through a sewer, so where it enters is approximate

Near these gauges, connection not known

Within 3 km of one of the Taff’s gauges in a straight line, but the river map cannot say whether their water reaches it.

  • Pen-Y-Darren Rd Jct With Gwalia Place Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Morlais Brook · 730 m from Merthyr Tydfil No1 River Station in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 69 spills, 127 h
  • Tai Mawr Way Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 900 m from Merthyr Tydfil No1 River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 47 spills, 140 h
  • East Of Rounabout A4102 Jct With High Street Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Morlais Brook · 1.2 km from Merthyr Tydfil No1 River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 114 spills, 657 h
  • Goitre Lane Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Goitre Brook · 1.3 km from Merthyr Tydfil No1 River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 25 spills, 35 h
  • Park Road Abercynon Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Sirhowy River · 1.4 km from Fiddlers Elbow River Station in a straight line · its recorded watercourse is not the one mapped beside it · 2025: 0 spills, 0 h
  • Poplar Road Rhydyfelin Overflow Not discharging
    Dwr Cymru Welsh Water · into River Taff · 1.5 km from Upper Boat River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 0 spills, 0 h
  • Merthyr Tydfil Industrial Park Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Pentrebach Brook · 1.5 km from Troedyrhiw River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 81 spills, 334 h
  • Gellifaelog Old Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Morlais Brook · 1.9 km from Merthyr Tydfil No1 River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 89 spills, 395 h
  • Rocky Road 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Morlais Brook · 2.0 km from Merthyr Tydfil No1 River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 9 spills, 2.3 h
  • Heol Saelm Garages Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Arian · 2.1 km from Upper Boat River Station in a straight line · its watercourse is not on the river map · 2025: 43 spills, 90 h
  • Balaclava Road 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Morlais Brook · 2.1 km from Merthyr Tydfil No1 River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 1 spill, 0.3 h
  • Heathwood Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Y Wedal · 2.1 km from Western Avenue River Station in a straight line · its watercourse is not on the river map · 2025: 27 spills, 27 h
  • Balaclava Road 1 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Morlais Brook · 2.2 km from Merthyr Tydfil No1 River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 4 spills, 1.0 h
  • Trelewis Glynbargoed Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Pandy Brook · 2.4 km from Fiddlers Elbow River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 99 spills, 241 h
  • Park Place Cilfnydd 1 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Nant Caedudwg · 2.4 km from Fiddlers Elbow River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 0 spills, 0 h

7 more near these gauges whose connection is not known.

6 other overflows within 3 km of these gauges are placed below the Taff’s lowest gauge or on another river, so not listed.

A status is the water company’s own monitor: it says whether an overflow is discharging, never how much or why, and a spill does not by itself explain a change in a river level. A status older than two hours is shown as unknown. Annual figures are the official returns: 12/24-hour spills for England and Wales, overflow events for Scotland (Scottish Water counts differently, so the two cannot be compared). “No data” means the monitor produced no usable data that year, not zero. Overflows are placed on OS Open Rivers (edition 2026-04), which leaves out many small channels: an overflow the map cannot place may still drain here. Contains OS data © Crown copyright and database rights 2026. Sewage in Britain’s rivers →

Live status: © Dŵr Cymru Welsh Water, from its Storm Overflow Map. Annual figures for Wales: Dŵr Cymru Welsh Water’s return to Natural Resources Wales, as compiled by The Rivers Trust, Open Government Licence.

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