Water Hardness in St James, WA
Postcode 6102 · Updated 2024-25 · Supplied by Water Corporation
94
mg/L CaCO3
Water in St James is moderately hard — may cause mild limescale over time.
How St James compares
This suburb
94 mg/L
Moderately Hard
Australian average
80.3 mg/L
17% harder than average
Western Australia average
99.8 mg/L
6% softer than state average
Hardness in nearby suburbs
Suburbs on the same water supply network
| Suburb | Hardness (mg/L) | Classification |
|---|---|---|
| St James (this suburb) | 94 | Moderately Hard |
| Bentley WA | 94 | Moderately Hard |
| Bentley South WA | 94 | Moderately Hard |
| Wilson WA | 94 | Moderately Hard |
| Carlisle North WA | 94 | Moderately Hard |
| Carlisle South WA | 94 | Moderately Hard |
| East Victoria Park WA | 94 | Moderately Hard |
What does 94 mg/L hardness mean?
How moderately hard water affects your daily life
Appliances & Plumbing
Moderately hard water can cause minor limescale buildup over time. You may notice white deposits in your kettle. Descale appliances every few months to maintain efficiency.
Soap & Detergent
Soap lathers reasonably well but you may need slightly more detergent than with soft water. Some soap scum may appear on glass surfaces.
Skin & Hair
Moderately hard water is generally fine for most people. Some with sensitive skin may notice mild dryness. Hair may feel slightly less smooth after washing.
Taste
Moderately hard water has a slight mineral taste that many people find acceptable or even pleasant. It's safe to drink.
How to deal with moderately hard water
Recommended solutions for 94 mg/L hardness in St James
Reverse Osmosis (RO) System
The most effective solution for hard water. Removes 90–99% of dissolved minerals including calcium and magnesium. Installed under the kitchen sink for drinking and cooking water.
Ion Exchange Water Softener
A whole-house solution that replaces calcium and magnesium ions with sodium. Prevents scale in all pipes and appliances. Requires salt top-ups every few weeks.
Carbon Filter
A carbon filter won't help with hardness — it only removes chlorine, taste, and odour. You need a reverse osmosis or ion exchange system to reduce hardness.
Utility reports average the grid — not your home
St James's water meets ADWG standards at the source, but old pipes, roof tanks, and ageing plumbing can add lead, copper or bacteria before the water reaches your tap. These won't show up in your utility report.
Check your own tap before buying a filter or assuming the suburb average matches your home.
Tetra
EasyStrips 6-in-1 Water Test (100 strips)
4.6 · 8,650 ratings on Amazon
Tests 6 parameters in 60 seconds: hardness, chlorine, pH, nitrate, nitrite, alkalinity. Cheapest way to verify your utility data.
Test my tap →Sponsored Amazon link. Check Amazon for current price and availability.
Heavy Metals
Drinking Water Test Kit (Lead, Copper, Iron, Mercury)
4.2 · 250 ratings on Amazon
20 tests. Detects lead, copper, iron, mercury — the things utility reports miss. Mobile-app results, EPA-standard thresholds.
Check metals kit →Sponsored Amazon link. Check Amazon for current price and availability.
Top filter picks for St James
Matched to 94 mg/L hardness and other local water parameters
BRITA
Marella 2.4L Fridge Water Filter Jug (Maxtra Pro)
4.8 · 125 ratings on Amazon
A reliable marella 2.4l fridge water filter jug (maxtra pro) suitable for St James's water profile.
ZeroWater
2.8L 5-Stage Jug (IAPMO Certified: PFOA/PFOS + Lead)
4.2 · 5,315 ratings on Amazon
A reliable 2.8l 5-stage jug (iapmo certified: pfoa/pfos + lead) suitable for St James's water profile.
Purewell
8.5L Stainless Steel Gravity System
4.4 · 1,137 ratings on Amazon
A reliable 8.5l stainless steel gravity system suitable for St James's water profile.
Guides for Perth and WA
In-depth articles on the water supply that serves St James
More about water in St James
Water hardness in nearby suburbs
Hardness pages for suburbs on the same water supply
Disclaimer: Water hardness information on this page is for general informational purposes only and does not constitute medical advice or professional guidance. Data is sourced from Water Corporation (last updated: 2024-25). Hardness values are based on the most recent published water quality reports and may not reflect real-time conditions at your tap. Actual water hardness can vary due to local plumbing and seasonal changes. Water hardness is measured as calcium carbonate (CaCO3) equivalent in mg/L. For specific health concerns, consult a qualified health professional. See our Terms of Use.