[6] The LGAs that were declared a natural disaster were: Blacktown, Blue Mountains, Camden Council, Canterbury-Bankstown, Campbelltown, Central Coast, Cessnock, Fairfield, Georges River, Hawkesbury, Hornsby, Kiama, Lithgow, Northern Beaches, Penrith, Shellharbour, Shoalhaven, Sutherland, The Hills, Wingecarribee, Wollondilly and Wollongong, with Bayside, Dungog, Lake Macquarie, Maitland, Singleton and Upper Lachlan being later included in the list as the scope of the disaster expanded.

[7] On 3 July, after prolonged rainfall in the Sydney area and the wettest start to the year on record, the Hawkesbury River at Windsor peaked at 13.9 metres, the highest in decades.

[8] Some regions, such as Lansvale and Camden in Western Sydney experienced their worst flooding disasters in four decades, with floodwaters in Windsor reaching their highest point since 1978.

[11][12] A cargo ship called The Portland Bay went missing for two days straight and was on the verge of shipwreck before it was finally rescued and eventually towed to Sydney.

[14] On 8 July, wooden and plastic debris, in addition to leaked oil containers, a spa and refrigerators were among the rubble drifting 100 kilometres down the Hawkesbury River, which turned up on beaches in Sydney's north, disrupting ferry services.

[28] A study in 2021 initiated by the government stated that raising the Warragamba Dam wall was the best choice for minimising risk to life, property damage and cost.