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Llwyd water levels

2 gauges. None is above its typical high. 3 storm overflows upstream are discharging now. Gauges in Torfaen; levels are checked every 15 minutes.

2gauges
0above normal
3overflows upstream discharging

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Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Pontnewynydd Abersychan River Stationplace estimated—0.22 m 2h agoWithin its typical range
Ponthir Star Industrial Est River Stationplace estimatedPonthir0.75 m 10m 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 Llwyd above one of its gauges, from the source down. The river map knows where gauges are, not every stream, so a tributary without a gauge is not listed here.

No gauged tributary joins the Llwyd above Ponthir Star Industrial Est River Station on the river map. Streams without a gauge are not counted here.

Where the Llwyd goes

No gauge below Ponthir Star Industrial Est 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.

Storm overflows upstream

50 storm overflows are traced upstream of Ponthir Star Industrial Est River Station, the Llwyd’s lowest gauge on the river map: on the Llwyd itself, on its gauged tributaries, and on smaller streams that join above there.

  • 3 report discharging now
  • 44 not discharging
  • 3 offline or silent: 3 monitor offline, 0 status unknown, 0 no live feed

Official figures for 2025, for the overflows traced upstream of Ponthir Star Industrial Est River Station: 1,658 spills over 10,062 hours in total, across the 48 that have a figure. 2 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 Llwyd includes the smaller streams that join it there. Every overflow traced is listed here, each stretch in full. Back to the short lists →

Above Ponthir Star Industrial Est River Station, the Llwyd’s highest gauge50 overflows · 3 discharging now
  • Allgood Avenue Blaenavon Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 24.0 km by river above Ponthir Star Industrial Est River Station · 2025: 0 spills, 0 h
  • Blaenavon Forgeside Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 23.6 km by river above Ponthir Star Industrial Est River Station · 2025: 24 spills, 168 h
  • Varteg Road Blaenavon Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 23.3 km by river above Ponthir Star Industrial Est River Station · 2025: 1 spill, 0.3 h
  • Bridge Street Blaenavon Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 23.3 km by river above Ponthir Star Industrial Est River Station · 2025: 55 spills, 212 h
  • Avon Road Blaenavon Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 23.0 km by river above Ponthir Star Industrial Est River Station · 2025: 42 spills, 217 h
  • Cwmavon Road Blaenavon No 1 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 22.6 km by river above Ponthir Star Industrial Est River Station · 2025: 2 spills, 3.5 h
  • Cwmavon Road Cwmavon Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 19.3 km by river above Ponthir Star Industrial Est River Station · 2025: 38 spills, 40 h
  • Cwmavon Road Garndiffaith No.3 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 17.7 km by river above Ponthir Star Industrial Est River Station · 2025: 41 spills, 62 h
  • Abersychan Cwmavon Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 17.3 km by river above Ponthir Star Industrial Est River Station · 2025: 58 spills, 138 h
  • Old Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 16.4 km by river above Ponthir Star Industrial Est River Station · 2025: 82 spills, 421 h
  • Pontypool Limekiln Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 16.1 km by river above Ponthir Star Industrial Est River Station · 2025: 0 spills, 0 h
  • Pontypool Leigh Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 15.7 km by river above Ponthir Star Industrial Est River Station · 2025: 0 spills, 0 h
  • Snatchwood Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 15.4 km by river above Ponthir Star Industrial Est River Station · 2025: 32 spills, 77 h
  • Freeholdland Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 15.3 km by river above Ponthir Star Industrial Est River Station · 2025: 52 spills, 317 h
  • Upper Hospital Road Pontnewynydd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 15.1 km by river above Ponthir Star Industrial Est River Station · 2025: 1 spill, 0.3 h
  • Fairview Court Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Afon Lwyd · 14.8 km by river above Ponthir Star Industrial Est River Station · 2025: 89 spills, 1,374 h
  • Mill Road Pontnewynydd 1 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 14.7 km by river above Ponthir Star Industrial Est River Station · 2025: 77 spills, 381 h
  • Mill Road Pontnewynydd 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 14.7 km by river above Ponthir Star Industrial Est River Station · 2025: 2 spills, 5.0 h
  • Pontnewyndd Hospital Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 14.6 km by river above Ponthir Star Industrial Est River Station · 2025: 40 spills, 47 h
  • Trevethin Storm Tank Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Afon Lwyd · 14.5 km by river above Ponthir Star Industrial Est River Station · 2025: 12 spills, 30 h
  • West Wainfelin Road Pontypool Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 14.3 km by river above Ponthir Star Industrial Est River Station · 2025: 35 spills, 282 h
  • East Wainfelin Road Pontypool Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 14.3 km by river above Ponthir Star Industrial Est River Station · 2025: 14 spills, 14 h
  • Woodland View Pontypool Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 14.3 km by river above Ponthir Star Industrial Est River Station · 2025: 4 spills, 1.8 h
  • Crumlin Road Pontypool 2 Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Trosnant Brook · 13.7 km by river above Ponthir Star Industrial Est River Station · 2025: 9 spills, 3.0 h
  • Riverside Car Park Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 13.6 km by river above Ponthir Star Industrial Est River Station · 2025: 113 spills, 626 h
  • Rosemary Lane Pontypool Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 13.4 km by river above Ponthir Star Industrial Est River Station · 2025: 2 spills, 0.8 h
  • Pontypool Park West Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 13.3 km by river above Ponthir Star Industrial Est River Station · 2025: 65 spills, 302 h
  • Pontypool Hanbury Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 13.2 km by river above Ponthir Star Industrial Est River Station · 2025: 31 spills, 35 h
  • Trosnant Street Pontypool Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into The Trosnant Brook · 12.8 km by river above Ponthir Star Industrial Est River Station · 2025: 29 spills, 88 h
  • Pontypool Fountain Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 12.2 km by river above Ponthir Star Industrial Est River Station · 2025: 60 spills, 308 h
  • Polo Grounds Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 11.3 km by river above Ponthir Star Industrial Est River Station · 2025: 21 spills, 23 h
  • New Inn New Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 10.8 km by river above Ponthir Star Industrial Est River Station · 2025: 80 spills, 436 h
  • Pontyfelin Lane Lower New Inn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 10.3 km by river above Ponthir Star Industrial Est River Station · 2025: 16 spills, 82 h
  • Griffithstown Subsidiary Sewer Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 9.3 km by river above Ponthir Star Industrial Est River Station · 2025: 98 spills, 810 h
  • Avondale Road Sebastopol Cwmbran Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Unnamed Tributary Of Afon Lwyd · 8.8 km by river above Ponthir Star Industrial Est River Station · 2025: 37 spills, 93 h
  • Cwmbran Chapen Lane Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 8.2 km by river above Ponthir Star Industrial Est River Station · 2025: 68 spills, 1,241 h
  • Brookland Terrace Recreation Ground Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Blaen Bran Brook · 8.0 km by river above Ponthir Star Industrial Est River Station · 2025: 49 spills, 289 h
  • Turners End Cwmbran Overflow Not discharging
    Dwr Cymru Welsh Water · into Dowlais Brook · 6.9 km by river above Ponthir Star Industrial Est River Station · 2025: 4 spills, 5.8 h
  • Rede Road Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Nant Y Milwr · 6.9 km by river above Ponthir Star Industrial Est River Station · 2025: 24 spills, 102 h
  • Edlogan Way 1 Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 6.7 km by river above Ponthir Star Industrial Est River Station · 2025: 24 spills, 89 h
  • Woodland Road And Recreation Ground Cwmbran Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 6.2 km by river above Ponthir Star Industrial Est River Station · 2025: 121 spills, 1,124 h
  • Ty Coch Way Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Dowlais Brook · 5.1 km by river above Ponthir Star Industrial Est River Station · 2025: 56 spills, 431 h
  • Olway Close Rear Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 4.9 km by river above Ponthir Star Industrial Est River Station · 2025: 0 spills, 0 h
  • Olway Close Front Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 4.9 km by river above Ponthir Star Industrial Est River Station · 2025: 5 spills, 3.8 h
  • Llangorse Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 4.9 km by river above Ponthir Star Industrial Est River Station · 2025: 0 spills, 0 h
  • Beaumaris Drive Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 4.4 km by river above Ponthir Star Industrial Est River Station · 2025: 7 spills, 21 h
  • Green Willows Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Dowlais Brook · 4.2 km by river above Ponthir Star Industrial Est River Station · 2025: 28 spills, 139 h
  • Llantarnam Covent Grounds Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 3.2 km by river above Ponthir Star Industrial Est River Station · 2025: 10 spills, 19 h
  • Ponthir Works Inlet Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 1.4 km by river above Ponthir Star Industrial Est River Station · no official annual figure
  • Llanfrechfa Storm Tanks Overflow Discharging now since
    Dwr Cymru Welsh Water · into Afon Lwyd · 1.4 km by river above Ponthir Star Industrial Est River Station · no official annual figure

Near these gauges, connection not known

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

  • Caerleon Road Ponthir Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Lwyd · 20 m from Ponthir Star Industrial Est River Station in a straight line · too close to Ponthir Star Industrial Est River Station to say which side · 2025: 81 spills, 207 h
  • St. Cadoc's Hospital Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Usk · 1.6 km from Ponthir Star Industrial Est River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 51 spills, 150 h
  • Lodge Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Afon Wysg · 1.7 km from Ponthir Star Industrial Est River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 1 spill, 0.8 h
  • Cold Bath Lane Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Usk Estuary · 1.7 km from Ponthir Star Industrial Est River Station in a straight line · discharges to the sea, an estuary or tidal water · 2025: 3 spills, 2.8 h
  • Tram Lane Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Blaen Bran Brook · 2.0 km from Ponthir Star Industrial Est River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 10 spills, 20 h
  • Caerleon Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Usk · 2.1 km from Ponthir Star Industrial Est River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 0 spills, 0 h
  • Usk Road Caerleon Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Usk · 2.3 km from Ponthir Star Industrial Est River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 3 spills, 0.8 h
  • Pilton Vale Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Pillmawr Creek · 2.5 km from Ponthir Star Industrial Est River Station in a straight line · discharges to the sea, an estuary or tidal water · 2025: 24 spills, 147 h
  • Rowan Way Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Pillmawr Creek · 2.8 km from Ponthir Star Industrial Est River Station in a straight line · discharges to the sea, an estuary or tidal water · 2025: 37 spills, 211 h
  • Horrocks Close Woodlands Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Pillmawr Creek · 2.9 km from Ponthir Star Industrial Est River Station in a straight line · discharges to the sea, an estuary or tidal water · 2025: 19 spills, 59 h
  • Robertson Way Storm Overflow Monitor offline
    Dwr Cymru Welsh Water · into Pillmawr Creek · 3.0 km from Ponthir Star Industrial Est River Station in a straight line · discharges to the sea, an estuary or tidal water · 2025: 10 spills, 12 h

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.