A two-year-old boy has been rushed to hospital after being pulled unconscious from a backyard pool in Sydney's west.

Emergency services were called to a property on Charles Street, Blacktown about 12.40pm after the toddler was found in a pool unresponsive.

Paramedics treated the child at the scene before taking him to the Children's Hospital at Westmead in a stable condition.

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NSW Police attended the scene and are investigating the incident, which is not being treated as suspicious.