All three were later pronounced dead at a local hospital.
It happened at the Chapel Tower apartment complex, located at 1315 Morreene Road, around 3 a.m.
When officers arrived, they found two males and one female submerged in the pool.
EMS workers pulled them out and worked frantically to save them. However, their attempts were unsuccessful.
Chopper 11 HD over Durham pool where 3 people died overnight
Officers did not comment on their identities or how the incident occurred.
A forensic team processed the scene for hours after the incident Tuesday.
Sandals, sneakers, and beer cans were found near the pool.
The pool was closed at the time of the drownings.
Police would not say if charges would be filed.