The daughter of late US singer Whitney Houston has been pulled unconscious from her bathtub at her home in Georgia in an eerie echo of her mother's tragic death three years ago.

Bobbi Kristina Brown, 21, was found by her husband and a friend at her home in Roswell, 35km north of Atlanta, the Atlanta Journal Constitution reported.

Emergency services were called to the scene before Brown was whisked to North Fulton Hospital for treatment, the report said.

A spokeswoman for Roswell Police Department was not immediately available for comment.

The TMZ.com said Brown's husband Nick Gordon and friend had performed CPR at the scene after making the discovery. The website reported that Brown was breathing as she underwent treatment in hospital.

Soul diva Whitney Houston died in February 2012 when she was found in a bathtub at the Beverly Hilton Hotel in Los Angeles on the eve of the music industry's annual Grammy Awards show.

Coroners concluded she died by accidental drowning, with cocaine use and heart disease as contributing factors.

Various bottles were found in the singer's hotel room - in all some 12 medications prescribed by five different doctors, including anxiety treatment Xanax and the potent corticosteroid Prednisone, the report said.

The singer of hits such as I Will Always Love You sold more than 170 million records during a nearly three-decade career, but also fought a long battle against substance abuse.

The singer left all of her assets to Bobbi Kristina - born from her troubled marriage to singer Bobby Brown - while excluding her ex-husband.