Emergency services rushed to the Binya Street, Griffith home just after 6pm on Sunday to find distraught family members performing CPR on the child, who was unresponsive when paramedics arrived.

It is believed the gate to the fence surrounding the above-ground backyard pool had been left open and the toddler had fallen in.

Paramedics worked to revive the child for about 30 minutes before rushing her to Griffith Base Hospital, where Emergency Department specialists continued attempts to revive her for one hour.

Tragically, attempts failed and she was pronounced dead.

A crime scene was established at the home and police will continue investigations into the incident.

A report will be prepared for the coroner.

Griffith Police Crime Manager Paul Smith said the case was certainly a traumatic one for all involved.

"These are incredibly tragic circumstances," Detective Inspector Smith said.

"Our thoughts go out to the families involved at this very difficult time."

Detective Inspector Smith urged all parents to be extra vigilant with young children around canals, pools and dams during the warmer months.

Tributes have flooded the Griffith Police Facebook page, with dozens of locals offering their heartfelt messages to the little girl's family.

The family too have shared their shock.

"You will honestly be missed not only by me but everyone," a family member's post said.

"These tears are going to be hard to wipe away knowing you are gone.

"You will truly be missed by everyone you brought a smile to.

"You were only here for a very very short time but you will not be forgotten.

"To all my family in Griffith I am thinking off you all at this hard time."

Just last month the NSW government moved to ensure all private pools across the state were registered in a bid to reduce the number of child drownings.