Water level
The Department of Parks and Wildlife (2006) identified the following threats to Beeliar's wetlands:  "Drainage, excavation and filling; Pollution including eutrophication; Water level changes; Salination; Aesthetic disruption (Section 24); Aquatic or declared weeds (Section 19); and Insect pest control (Section 21)". Of the identified threats, four have been the selected targeted areas for environmental protection: "Drainage, excavation and filling; 2. Pollution including eutrophication; 3. Water level changes; and 4. Salination". The Department (2006) reports that "406 native taxa" are found within the Beeliar features. This report also identified Thomsons Lake and Koholup Lake as Aboriginal sites under the "Aboriginal Heritage Act 1972".