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Coordinates: 51°29′28″N 3°32′53″W / 51.491°N 3.548°W

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51°29′28″N 3°32′53″W / 51.491°N 3.548°W / 51.491; -3.548 Schwyll Aquifer (pronounced 'Shwill') was historically known as 'the Great Spring of Glamorgan'. Welsh Water uses the resurgence at the Schwyll Spring near Ewenny in the Vale of Glamorgan as the main source of water for the Bridgend area. Now functioning as a backup supply, it has a number of associated source protection zones policed by Natural Resources Wales.

The aquifer is an underground layer of water-bearing permeable rock. In this case, it consists of an underground waterway in the carboniferous limestone. Due to the delay between local heavy rain and discoloration of the water at the spring, it is believed that the origination is 20 miles away. This would locate the main source in the limestone of the southern edge of the Brecon Beacons. The lack of an access at the rising hinders exploration of the cave system. The only known point of access is at the pumping shaft of the extraction plant at Schwyll. The system was explored by cave divers in 1998 to 440 metres from the shaft. At 400 metres, a large cavern was discovered containing bones which were identified as horse. The bones were submitted for dating.

The outflow of the spring is far larger than any other spring in Wales and greater than that from the Wookey Hole or the Cheddar Gorge risings in England.

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v t e Aquifers
Canada	Arkell Spring Grounds Laurentian River System Oak Ridges Moraine
United States	Biscayne Aquifer Bishop Subbasin Buried Valley Aquifer System Edwards Aquifer Floridan aquifer Fox Hills Formation Kirkwood–Cohansey aquifer Mahomet Aquifer Ogallala Aquifer Permian Basin San Diego Formation Sankoty Aquifer Santa Clara valley aquifer Snake River Aquifer Southern Hills Aquifer Turlock Basin Wekepeke
Mexico	Lake Texcoco
South America	Guarani Aquifer Hamza River
Australia	Botany Sands Aquifer Gnangara Mound Great Artesian Basin Jandakot Mound Yarragadee Aquifer
New Zealand	Waiwhetu Aquifer
Africa	Bas Saharan Basin Lotikipi Basin Aquifer Nubian Sandstone Aquifer System
Middle-East	Yarkon-Taninim Aquifer
Europe	Alnarpsströmmen Schwyll Aquifer Upper Rhine Plain
Related articles	List of aquifers Aquifers in the United States Aquifer storage and recovery Aquifer test Artesian aquifer Sole Source Aquifer Surficial aquifer
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