According to Royal Life Saving NSW, figures from local councils reveal 80 per cent of the 350,000 swimming pools registered in the state would fail their first compliance inspection.
In the past 13 years, 83 children have drowned in backyard swimming pools in NSW.
Royal Life Saving NSW has urged pool owners to do a full safety check on their pool or spa to reduce the toll of backyard drownings.
Operations Manager at Royal Life Saving NSW, Michael Ilinsky, said it was "deeply concerning" that so many pools were not up to scratch.
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