Miss Augusta Jeanne Serreplaà was born in Lalinde, Dordogne, Aquitaine, France on 8 July 1881; she was the daughter of Jean Serreplaà (b. 1854) and Marie Roquejoffre (b. 1860). Deatils about her early life are unknown.

Augusta had first arrived in the USA on 28 November 1908 aboard La Lorraine to find work as a lady's maid; by 1910, at the time of the census, she was working as in this capacity and in the employ of Mrs Ada Kerner, the wife of a wealthy broker, and was living at 26 West 39th Street, Manhattan. Exactly when she came under the employment of Mrs William Ernest Carter is not clear.

Serreplaà boarded the Titanic at Southampton as a first class passenger, travelling in the Carter entourage and on the same ticket as Alexander Cairns, the Carters' Scottish manservant (ticket number 113798 which cost £31). Whilst aboard she shared cabin C138 with Berthe Leroy, the French maid of Mrs Mahala Douglas.

Miss Serreplaà survived the sinking with her employer Mrs Carter, escaping in lifeboat 4.

How long Miss Serreplaà remained in the employ of the Carters is not known; they later divorced, with Mrs Carter remarrying and Augusta apparently did not remain in her service following this. By 1925 she was listed as a boarder at an address in Manhattan but other details about her employment post-Titanic are unclear. She was, however, never married.

Augusta Serreplaà died in Manhattan on 25 October 1928. Her death record states that she was 43 at the time of her death but in fact she was 47.