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Home › Rivers › River Neath

River Neath water levels

1 gauge, at Neath Tidal River Station. 5 storm overflows upstream are discharging now. Gauges in Neath Port Talbot; levels are checked every 15 minutes.

1gauge
5overflows upstream discharging

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Gauges

Monitoring stations, source to mouth

StationTownLevel nowStatusTrend
Neath Tidal River Stationtidal—1.34 mAOD 19m agoWithin its typical range▼

Also on the Neath by the river map, but filed under another river name: Glyn Neath River Station and Resolven River Station.

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 Neath 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, 4 gauges

Dulais

Joins the Neath above Neath Tidal River Station, its highest gauge, no more than 5.2 km by river above Neath Tidal River Station.

Cilfrew River Station0.55 m 19m agoWithin its typical range

Its water passes every gauge on the Neath, from Neath Tidal River Station down.

Where the Neath goes

No gauge below Neath Tidal 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 Neath 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.

Storm overflows upstream

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

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

Official figures for 2025, for the overflows traced upstream of Neath Tidal River Station: 1,742 spills over 16,208 hours in total, across all 24.

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 Neath includes the smaller streams that join it there.

Above Neath Tidal River Station, the Neath’s highest gauge6 overflows
Dulais, above Cilfrew River Stationjoins the Neath above Neath Tidal River Station5 overflows · 3 discharging now
Above Resolven River Station9 overflows
  • Bethel Road Glynneath Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 9.7 km by river above Resolven River Station · 2025: 37 spills, 94 h
  • High Street Gellidawel Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 8.9 km by river above Resolven River Station · 2025: 110 spills, 517 h
  • Godfrey Avenue Rear Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 8.3 km by river above Resolven River Station · 2025: 78 spills, 294 h
  • Chain Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 7.8 km by river above Resolven River Station · 2025: 67 spills, 505 h
  • Cwmgwrach WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 6.9 km by river above Resolven River Station · 2025: 113 spills, 1,331 h
  • Heol Tonmaen Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 2.1 km by river above Resolven River Station · 2025: 17 spills, 8.5 h
  • B4434 Roundabout Resolven Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 1.9 km by river above Resolven River Station · 2025: 34 spills, 28 h
  • Resolven WwTW Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 1.1 km by river above Resolven River Station · 2025: 67 spills, 585 h
  • Moses Row Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Melin Court Brook · 1.1 km by river above Resolven River Station · 2025: 67 spills, 627 h
Above Glyn Neath River Station4 overflows · 2 discharging now
  • Onllwyn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Afon Camnant · 10.5 km by river above Glyn Neath River Station · 2025: 111 spills, 1,117 h
  • Heol Pendarren Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Ditch To Nant Gwrangon · 7.2 km by river above Glyn Neath River Station · 2025: 48 spills, 89 h
  • Hirwaun Industrial Estate WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into Afon Camnant · 6.7 km by river above Glyn Neath River Station · 2025: 170 spills, 3,661 h
  • Pontneddfechan WwTW Storm Overflow Discharging now since
    Dwr Cymru Welsh Water · into River Mellte · 2.4 km by river above Glyn Neath River Station · 2025: 180 spills, 1,616 h

Near these gauges, connection not known

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

  • Neath Quay Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Estuarial Waters Of The River Neath · 100 m from Neath Tidal River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 64 spills, 105 h
  • Dwr Y Felin Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Estuarial Waters Of Afon Nedd · 140 m from Neath Tidal River Station in a straight line · discharges into a tidal reach, where the water moves both ways · no official annual figure
  • Cadoxton Road Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 280 m from Neath Tidal River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 3 spills, 40 h
  • Fairfield Neath Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Estuarial Waters Of Afon Nedd · 440 m from Neath Tidal River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 109 spills, 539 h
  • Roman Way Neath Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 600 m from Neath Tidal River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 24 spills, 50 h
  • Heol Illtyd Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Neath · 870 m from Neath Tidal River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 9 spills, 26 h
  • Melincryddan Neat Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Estuarial Waters Of Afon Nedd · 1.1 km from Neath Tidal River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 76 spills, 419 h
  • Stanley Place Storage Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of Tennant Canal · 1.1 km from Neath Tidal River Station in a straight line · discharges into a canal · 2025: 7 spills, 27 h
  • Llantwit Road Neath Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Estuarial Waters Of Llantwit Stream · 1.1 km from Neath Tidal River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 21 spills, 48 h
  • Neath Hillside Lane Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Eastland Brook · 1.3 km from Neath Tidal River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 15 spills, 17 h
  • Neath Abbey Ruins Southeast Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into River Clydach · 1.4 km from Neath Tidal River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 88 spills, 384 h
  • Neath Penrhiwtyn Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tributary Of River Clydach · 1.7 km from Neath Tidal River Station in a straight line · several watercourses close by, nothing to choose between them · 2025: 40 spills, 259 h
  • Old Road Skewen Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Tennant Canal · 1.9 km from Neath Tidal River Station in a straight line · discharges into a canal · 2025: 83 spills, 254 h
  • Cimla Common Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Hollins Clough Ditch · 2.0 km from Neath Tidal River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 6 spills, 17 h
  • Aberdulais Storm Overflow Not discharging
    Dwr Cymru Welsh Water · into Neath Estuary · 2.0 km from Neath Tidal River Station in a straight line · discharges to the sea, an estuary or tidal water · 2025: 26 spills, 68 h

8 more near these gauges whose connection is not known.

6 other overflows within 3 km of these gauges are placed below the Neath’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.

Wave tracker for this river → Neath Port Talbot rivers → All UK rivers