 Scheyville National Park is significant for its associations with community groups involved in the environmental conservation movement in western Sydney during the late 20th century, including the National Parks Association and Concerned Residents Against Development of Longneck Lagoon (CRADLE).The place is important in demonstrating aesthetic characteristics and/or a high degree of creative or technical achievement in New South Wales.Scheyville National Park is of state significance as an extensive landscape of woodlands and wetlands that crown the high land above the rural and village countryside of the Pitt Town Bottoms and the Hawkesbury Valley.