Perth Water Quality · Wanneroo
Water quality in Wanneroo
Your local water hardness and the full breakdown of 16 parameters, sourced from Water Corporation's 2024–25 report.
Updated with Water Corporation 2024-25 data.
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Covers: Ashby, Darch, Gnangara, Hocking, Jandabup, Landsdale, Madeley, Mariginiup, Pearsall, Pinjar, Sinagra, Tapping, Wangara, Wanneroo
These figures are about taste, scale and appliance life — not safety. Is Perth tap water safe to drink? →
Wanneroo supply zone
Hard water
125mg/L total hardness (range 110–150)
Water in Wanneroo is hard. Expect limescale on appliances, shower screens and hot water systems over time. Scale prevention or softening makes a noticeable difference here.
Other figures worth knowing
Chlorine by-products (THMs)0.106mg/L
pH7.54
Dissolved solids480mg/L
Sodium93mg/L
Perth's water is disinfected with free chlorine at roughly 0.4–1.0 mg/L network-wide. The figure above is trihalomethanes (THMs) — by-products of chlorination that a catalytic carbon filter reduces. In Wanneroo they run at about 42% of the safety guideline.
What this means for your home
Water in Wanneroo is hard. Expect limescale on appliances, shower screens and hot water systems over time. Scale prevention or softening makes a noticeable difference here.
✓Our honest take: A scale-prevention or softening stage is worth it — it protects your appliances and hot water system.
Full water quality breakdown — Wanneroo
Scale & hardness
Total hardness125110–150 mg/L as CaCO3
Total dissolved solids480466–509 mg/L
Alkalinity10891–150 mg/L as CaCO3
Silica17.517–18 mg/L
General chemistry
pH7.547.39–7.8 pH units
Sodium9383–105 mg/L
Chloride160145–170 mg/L
Sulphate2315–26 mg/L
Aesthetic (taste, colour, staining)
Iron0.0160.01–0.02 mg/L
Manganese0.0040.002–0.007 mg/L
Aluminium0.010.008–0.025 mg/L
True colour11–1 HU
Turbidity0.10.1–0.2 NTU
Health-related
Fluoride0.80.7–0.85 mg/L
Nitrate3.12.2–5.3 mg/L
Trihalomethanes (THMs)0.1060.066–0.13 mg/L
About this supply area: Water Corporation reports quality by supply locality rather than individual suburb, so the suburbs listed at the top of this page all share the Wanneroo figures. Your exact property may vary slightly. Water Corporation doesn’t publish supply boundaries street-by-street, so matching suburbs to localities involves some interpretation — homes near a boundary may actually be served by a neighbouring locality, and figures there can differ slightly.
Source: Water Corporation Drinking Water Quality Annual Report 2024–25, Perth Region (aesthetic & health tables). Figures are locality means with min–max range. Verified July 2026. Wanneroo met all health-related safety requirements in 2024–25. See all Perth suburbs →