The fluoride status of Onslow's public water supply, who decides, and how to check it yourself. Page last updated 6 November 2026.
Natural fluoride around 0.6 mg/L, none added.
A desalination plant due in 2027 will supplement the supply and could lower the natural fluoride level.
Without fluoridated water, dental guidelines put more weight on fluoride toothpaste, diet and regular check-ups. Your supply does carry some natural fluoride. Some people prefer fluoride-free options.
Law: Fluoridation of Public Water Supplies Act 1966
Who decides: Health Minister, on advice of an advisory committee.
Coverage: about 94% of residents (2025). First fluoridated: Perth, 1968.
0.70 mg/L natural (2024-25 mean), according to Water Corporation annual report 2024-25. Fluoridated supplies in Australia target 0.6 to 1.1 mg/L, and the health guideline maximum is 1.5 mg/L.
Never added.
Fluoride isn't added, but it occurs naturally in Onslow's water. Natural fluoride around 0.6 mg/L, none added.
Health Minister, on advice of an advisory committee.
Look up Water Corporation's annual drinking water quality report, which lists fluoride in mg/L by supply zone. You can also ask the utility for monthly readings.
No. Boiling leaves the fluoride behind and slightly concentrates it. Reverse osmosis, distillation and activated alumina filters remove fluoride. Read more.