Search your suburb or click your zone on the map. Hardness, TDS, pH, sodium and chloride data from Water Corporation's 2023–24 annual testing — with a plain-English filtration recommendation for your area.
Click a coloured zone to see data, or search your suburb above for an exact boundary highlight.
Search your suburb above or click a coloured zone on the map to see your water quality data.
Click any bar to see that zone's data. Use the buttons to switch between hardness, TDS and sodium.
Search your suburb above to see how you compare.
We'll recommend the right filtration for your home — no jargon, no upsell.
Scale builds up inside appliances reducing their efficiency and lifespan. Select the appliances you own and adjust your water hardness — we'll estimate the annual cost of doing nothing.
Hot water system costs based on Battelle Memorial Institute study (WQRF, 2009): 4% efficiency loss per 5 GPG hardness, up to 48% maximum. Other appliances based on Carbon Trust scale data and AUD appliance replacement costs (2025 market averages). Perth electricity $0.31/kWh. Evaporative air con estimated. Actual costs vary by appliance age and usage.
These parameters are set centrally by Water Corporation and the WA Department of Health — consistent regardless of your suburb.
| Parameter | Perth level | Guideline | What it means |
|---|---|---|---|
| Fluoride | 0.82 mg/L mean | Target 0.75–0.90 · Limit 1.5 mg/L | Added by WA DoH for dental health. Within target range. Standard filters do not remove fluoride — only reverse osmosis does. |
| Trihalomethanes | 0.058–0.131 mg/L | 0.25 mg/L guideline | Form when chlorine reacts with organic matter. Higher in groundwater zones. Carbon block filtration removes them effectively. |
| Chlorine residual | 0.6–1.0 mg/L typical | 5 mg/L limit | Added for disinfection in transit. Safe but causes the chlorine taste and smell at the tap. Carbon block removes it completely. |
| E. coli | Not detected | 0 per 100mL | Perth drinking water is microbiologically safe — 100% compliance in 2023–24. |
Source: Water Corporation Drinking Water Quality Annual Report 2023–24.
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