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Perth Water Quality · Two Rocks

Water quality in Two Rocks

Your local water hardness and the full breakdown of 16 parameters, sourced from Water Corporation's 2023–24 report.

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Two Rocks supply zone
Very hard water
228mg/L total hardness (range 220–230)
Water in Two Rocks is very hard — among the hardest in Perth. Limescale will build up quickly on appliances and hot water systems. Scale prevention is well worth it here.
Other figures worth knowing
Chlorine by-products (THMs)0.005mg/L
pH7.59
Dissolved solids535mg/L
Sodium57mg/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 Two Rocks they run at about 2% of the safety guideline.

What this means for your home

Water in Two Rocks is very hard — among the hardest in Perth. Limescale will build up quickly on appliances and hot water systems. Scale prevention is well worth it here.

✓
Our honest take: Scale prevention is strongly worth it here — it meaningfully extends the life of your hot water system and appliances.
See your filtration options → Learn about hard water
Full water quality breakdown — Two Rocks
Scale & hardness
Total hardness228220–230 mg/L as CaCO3
Total dissolved solids535519–550 mg/L
Alkalinity210200–220 mg/L as CaCO3
Silica11.511–12 mg/L
General chemistry
pH7.597.54–7.7 pH units
Sodium5755–59 mg/L
Chloride106105–110 mg/L
Sulphate1615–17 mg/L
Aesthetic (taste, colour, staining)
Iron0.0040.003–0.006 mg/L
Manganese0.0020.002–0.002 mg/L
Aluminium0.0080.008–0.008 mg/L
True colour11–1 HU
Turbidity0.10.1–0.1 NTU
Health-related
Fluoride0.150.15–0.15 mg/L
Nitrate43.5–4.4 mg/L
Trihalomethanes (THMs)0.0050.002–0.008 mg/L
Suburbs in the Two Rocks supply area: Two Rocks. Water Corporation reports quality by supply locality rather than individual suburb, so these suburbs share the Two Rocks figures above. Your exact property may vary slightly.

Check a different suburb

Source: Water Corporation Drinking Water Quality Annual Report 2023–24, Perth Region (aesthetic & health tables). Figures are locality means with min–max range. Verified June 2026. Two Rocks met all health-related safety requirements in 2023–24. See all Perth suburbs →

Complete Home Filtration and CHF are trademarks used by Environmental Water Solutions Pty Ltd. ProperWater is not affiliated with, endorsed by, or sponsored by Complete Home Filtration or Environmental Water Solutions Pty Ltd. Model references including CHF-6000 and CHF-6200 are used solely to indicate product compatibility — PW Series replacement filters are independently designed for compatibility with standard 15" × 4.5" filter housings. All comparative pricing based on Complete Home Filtration's publicly published rates as of 2025.