Berrington Hall has closed its mansion and tea room following a burst water main.
The outage is affecting water supplies in Kimbolton and Leominster and has forced the National Trust property to close parts of its site to visitors.
The water main is believed to have burst at around 6am.
Welsh Water is currently investigating the issue.
Berrington Hall, located three miles north of Leominster in Herefordshire, is a neoclassical country house designed by Henry Holland and built between 1778 and 1781.
The hall is surrounded by the final landscape design of famed landscape architect Capability Brown.
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The mansion and the surrounding gardens have been in the care of the National Trust since 1957.
It was originally commissioned by Thomas Harley and later became the seat of the Cawley family in the 20th century.
The property is known for its interior collections, including the Elmar Digby furniture collection, paintings by Thomas Luny, and the Charles Paget Wade costume collection.
Its “below stairs” areas, such as the Victorian laundry and Georgian dairy, are ordinarily open to the public.
One of its most notable features is the ha-ha wall, which was subject to extensive renovation in the late 20th century by local craftsmen.
Berrington Pool, located on the grounds, is designated as a Site of Special Scientific Interest.
Welsh Water expects to resolve the issue by 1pm.
