The House Under the Water is a British historical television drama series which originally aired on BBC One in eight parts during 1961.^[1] It is an adaptation of the 1932 novel The House Under the Water by Francis Brett Young, which portrays the late nineteenth century flooding of the Elan Valley in Wales to create a water supply for the rapidly growing city of Birmingham.

All eight episodes are now considered to be lost.

• Margaret Courtenay as Lucrezia Tregaron (8 episodes)
• Richard Bebb as Evan Vaughan (8 episodes)
• Carole Mowlam as Philippa Tregaron (8 episodes)
• Emrys James as Rob Tregaron (8 episodes)
• William Squire as Griffith Tregaron (7 episodes)
• Ray Smith as Gerald Tregaron (7 episodes)
• Hira Talfrey as Caterina (7 episodes)
• Lesley Lloyd as Virginia Tregaron (6 episodes)
• Aubrey Richards as Abel Pugh (6 episodes)
• Annest Williams as Diana Tregaron (5 episodes)
• Patricia Mort as Janet Delahaye (5 episodes)
• Arnold Bell as Sir Trevor Delahaye (4 episodes)
• David Lyn as Charles Lingen (4 episodes)
• June Lewis as Sula Meredith (4 episodes)
• David Lawton as Louis Wiener (4 episodes)
• Hubert Rees as Esmond Delahaye (3 episodes)
• D.L. Davies as Meredith (2 episodes)
• Ian Colin as Sir Arthur Weldon (2 episodes)
• Edward Evans as Mr. Barradale (2 episodes)
• Ieuan Rhys Williams as Mr. Prosser (2 episodes)
• Otto Diamant as Otto Wiener (2 episodes)
• T.H. Evans as Man at the Inn (1 episode)
• Ivor Maddox as Stockbroker (1 episode)
• Emrys Cleaver as Man at the Inn (1 episode)
• W.H. Williams as Man at the Inn (1 episode)
• Pryor Williams as Sergeant Ambrose (1 episode)
• John Gill as Mr. Verona (1 episode)
• Desmond Llewelyn as Colonel Tregaron (1 episode)
• Conrad Evans as Mr. Parry (1 episode)
• Frederick Schiller as Mr. Dagmar (1 episode)

• Ellen Baskin. Serials on British Television, 1950-1994. Scolar Press, 1996.

• The House Under the Water at IMDb