50% of our profits go back into the community. We sponsor junior and community sport clubs across Perth — follow us on Facebook to see which clubs we support.
Learn more → Follow us
Perth Water Quality · Thomsons Lake

Water quality in Thomsons Lake

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

← All Perth suburbs
Thomsons Lake supply zone
Moderately hard
86mg/L total hardness (range 46–110)
Water in Thomsons Lake is moderately hard. You may notice some scale over time on kettles and shower screens, but it’s manageable. Carbon filtration improves taste; softening is optional.
Other figures worth knowing
Chlorine by-products (THMs)0.06mg/L
pH7.85
Dissolved solids431mg/L
Sodium105mg/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 Thomsons Lake they run at about 24% of the safety guideline.

What this means for your home

Water in Thomsons Lake is moderately hard. You may notice some scale over time on kettles and shower screens, but it’s manageable. Carbon filtration improves taste; softening is optional.

✓
Our honest take: A carbon filter improves taste and chlorine; scale prevention is a nice-to-have, not essential.
See your filtration options → Learn about hard water
Full water quality breakdown — Thomsons Lake
Scale & hardness
Total hardness8646–110 mg/L as CaCO3
Total dissolved solids431156–578 mg/L
Alkalinity7437–97 mg/L as CaCO3
Silica4.91.8–6.9 mg/L
General chemistry
pH7.857.52–8 pH units
Sodium10529–150 mg/L
Chloride17555–230 mg/L
Sulphate205–30 mg/L
Aesthetic (taste, colour, staining)
Iron0.0140.003–0.03 mg/L
Manganese0.0090.002–0.03 mg/L
Aluminium0.0080.008–0.012 mg/L
True colour11–1 HU
Turbidity0.20.1–0.5 NTU
Health-related
Fluoride0.80.7–0.85 mg/L
Trihalomethanes (THMs)0.060.022–0.1 mg/L
Suburbs in the Thomsons Lake supply area: Atwell, Aubin Grove, Banjup, Hammond Park, Jandakot, Success, Thomsons Lake, Treeby, Wattleup. Water Corporation reports quality by supply locality rather than individual suburb, so these suburbs share the Thomsons Lake 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. Thomsons Lake 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.