1 gauge, at Glan Gwili River Station. It is not above its typical high. 1 storm overflow upstream is discharging now. Gauges in Carmarthenshire; levels are checked every 15 minutes.
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.
Streams and rivers with a gauge whose water joins the Gwili above one of its gauges, from the source down. Named streams without a gauge that have a page here are listed at the end.
No gauged tributary joins the Gwili above Glan Gwili River Station on the river map. Streams without a gauge are not counted here.
Named streams on the river map that flow into the Gwili 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.
Afon Duad (joins about 8.9 km above Glan Gwili River Station)
Nant Alltwalis (joins about 15 km above Glan Gwili River Station)
Storm overflows upstream
8 storm overflows are traced upstream of Glan Gwili River Station, the Gwili’s lowest gauge on the river map: on the Gwili itself, on its gauged tributaries, and on smaller streams that join above there.
1 reports discharging now
6 not discharging
1 offline or silent: 1 monitor offline, 0 status unknown, 0 no live feed
Official figures for 2025, for the overflows traced upstream of Glan Gwili River Station: 598 spills over 8,244 hours in total, across the 7 that have a figure. 1 has 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 Gwili includes the smaller streams that join it there.
Above Glan Gwili River Station, the Gwili’s highest gauge8 overflows · 1 discharging now
Alltwallis OverflowNot discharging Dwr Cymru Welsh Water · into Nant Alltwalis · 18.6 km by river above Glan Gwili River Station · 2024: 89 spills, 997 h
Brynmeillion Storm OverflowNot discharging Dwr Cymru Welsh Water · into Tributary Of The Nant Corrwg · 18.4 km by river above Glan Gwili River Station · 2025: 65 spills, 201 h
Cwmduad WwTW Storm OverflowDischarging now since Dwr Cymru Welsh Water · into Afon Duad · 14.2 km by river above Glan Gwili River Station · 2025: 109 spills, 1,948 h
Llanpumpsaint WwTW Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Gwili · 14.2 km by river above Glan Gwili River Station · 2025: 87 spills, 1,167 h
Pont Cynwyl Storm OverflowNot discharging Dwr Cymru Welsh Water · into Nant Gochen · 10.7 km by river above Glan Gwili River Station · 2025: 14 spills, 102 h
Cynwyl Elfed WwTW Storm OverflowMonitor offline Dwr Cymru Welsh Water · into Afon Duad · 9.9 km by river above Glan Gwili River Station · 2025: 97 spills, 2,035 h
Cwmdwyfran Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Gwili · 4.4 km by river above Glan Gwili River Station · 2025: 29 spills, 296 h
Bronwydd WwTW Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Gwili · 2.5 km by river above Glan Gwili River Station · 2025: 197 spills, 2,495 h
Near these gauges, connection not known
Within 3 km of one of the Gwili’s gauges in a straight line, but the river map cannot say whether their water reaches it.
Tanerdy Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Towy · 1.4 km from Glan Gwili River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 97 spills, 642 h
Old Priory Road Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Towy · 1.9 km from Glan Gwili River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 93 spills, 220 h
Parc Hinds Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Tywi · 1.9 km from Glan Gwili River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 2 spills, 30 h
Heol Llangynnwr Carmarthen OverflowNot discharging Dwr Cymru Welsh Water · into River Towy · 2.5 km from Glan Gwili River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 105 spills, 716 h
Old Station Road Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Towy · 2.6 km from Glan Gwili River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 125 spills, 345 h
Carmarthen Bridge Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Towy · 2.7 km from Glan Gwili River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 86 spills, 116 h
Carmarthen Sticle Footpath Storm OverflowNot discharging Dwr Cymru Welsh Water · into Tributary Of Afon Tawe · 2.8 km from Glan Gwili River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 61 spills, 192 h
Pensarn OverflowNot discharging Dwr Cymru Welsh Water · into Unnamed Watercourse · 2.8 km from Glan Gwili River Station in a straight line · no mapped watercourse close enough to be sure · 2025: 8 spills, 39 h
Pothouse Wharf Storm OverflowNot discharging Dwr Cymru Welsh Water · into River Towy · 2.9 km from Glan Gwili River Station in a straight line · discharges into a tidal reach, where the water moves both ways · 2025: 102 spills, 609 h
2 other overflows within 3 km of these gauges are placed below the Gwili’s lowest gauge or on another river, so not listed.
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