Australian Water Quality Guide

What's actually in your suburb's water?

Select your city to see what's in your water and what filter — if any — makes sense for your home.

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180+ Perth suburbs across 28 Water Corporation quality zones · Data: 2023–24 annual report

Popular suburbs — tap to look up

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About Perth's water: Supply comes from desalination (36%), surface water from dams (18.7%), groundwater (44.6%), and groundwater replenishment. Groundwater-heavy areas like Mirrabooka, Neerabup and Yanchep tend to have higher hardness and TDS. Desalination-dominant areas like Mandurah and Rockingham are softer. All Perth town water meets Australian Drinking Water Guidelines health standards.

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Perth TAP WATER GUIDE Hard water · High chlorine Desalination · Groundwater 28 zones · 180+ suburbs ✓ Meets Australian Drinking Water Guidelines
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Is Perth tap water safe to drink?
Safe — but hard, chlorinated, and mineral-heavy depending on your suburb. Here's what's actually in Perth's wa…
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Perth Hardness BY SUBURB · DATA GUIDE Yanchep / Butler: 200–350 mg/L Inner Perth: 80–130 mg/L Rockingham / Mandurah: 50–60 mg/L
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Perth's Hardest Water Suburbs
Hardness data for 73 Perth suburbs across 28 Water Corporation zones.
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TAC SALT Install $1,800 Annual $120 10yr total $3,000 ✓ WINNER Install $1,500 Annual $480 10yr total $6,300 +110% more VS Perth 4-person household · 10-year model
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TAC vs salt softener: 10-year cost comparison for Perth homes
We ran the numbers — purchase price, salt cost, water waste, service calls and energy use — over a decade for …
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Hard WaterHOT WATER SYSTEMS6mm scale = 10% energy lossPerth outer: 300+ mg/L hardnessHeat pumps: most scale-vulnerable
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Hard water and hot water systems — what scale actually costs you
Every 6mm of limescale cuts hot water efficiency by 10%. Perth outer zones exceed 300 mg/L. Heat pump systems …
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Bore Water FILTRATION GUIDE — WA Iron & iron staining Iron bacteria Salinity Test before you treat ⚠ Not the same as scheme water — test first
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Bore water filtration guide for WA homeowners
One in four Perth homes uses a bore for irrigation. But bore water is untreated groundwater — iron, bacteria a…
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Coffee WaterBY CITY GUIDESCA target: 75-250 mg/L TDSMelbourne: add mineralsAdelaide/Perth: RO + remineralise
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Water filter for coffee machines — what each Australian city needs
Melbourne tap is too soft for espresso (35 mg/L TDS). Adelaide causes rapid scale (480 mg/L). Here's what SCA …
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13 Sydney Water supply zones · 2023–24 data · All zones soft water (30–58 mg/L)
Sydney water quality

Sydney has soft, chloramine-treated water from protected mountain catchments. The primary reason to filter is chloramine taste, not hardness or scale.

Hardness
43
mg/L avg — soft
Disinfectant
Chloramine
all supply zones
Fluoride
1.0
mg/L — highest capital
Softener needed?
No
all zones already soft
What filter for Sydney? Catalytic carbon (not standard GAC) for chloramine. No suburb needs a softener. RO (NSF 58) for fluoride or PFAS (Blue Mountains). Full Sydney guide →
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Sydney TAP WATER GUIDE Safe to drink? What's actually in it? What filter helps? ✓ Meets Australian Drinking Water Guidelines
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Is Sydney tap water safe to drink?
Soft, chloramine-treated and from protected mountain catchments. Here's what's in Sydney's water and what filt…
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Sydney WaterSOFT OR HARD GUIDE43 mg/L avg — soft city-wideNo softener needed anywhereChloramine needs catalytic carbon
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Is Sydney water soft or hard — and what filter do you need?
Sydney averages 43.4 mg/L hardness across all 13 supply zones. Every suburb is classified as soft. No softener…
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Sydney PFASBLUE MOUNTAINS GUIDEJun 2024: detected at Cascade plantDec 2024: $3.4M GAC treatment liveJun 2025: all NSW supplies compliant
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PFAS in Sydney's Blue Mountains water — the full guide
PFAS detected at Cascade plant in June 2024 affecting 41,000 homes. $3.4M emergency treatment installed Dec 20…
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Shower FiltersINDEPENDENT GUIDECan't soften water — marketing mythNSF 177 = free chlorine onlyVitamin C needed for chloramine cities
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Baby FormulaWATER GUIDEBoiling makes lead/nitrates worseStandard jug filters not enoughRO: removes lead, fluoride, PFAS
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Melbourne water quality

Melbourne has the softest mains water of any Australian capital, from protected forested catchments in the Yarra Ranges. Limescale is not a concern for any metropolitan suburb. Yarra Valley Water won the 2024 national best-tasting tap water award.

Hardness
18
mg/L avg
Very soft
TDS
~35
mg/L est.
Very low
Disinfection
Chlorine
primary
Standard
Scale risk
None
all metro zones
Negligible

What residents notice

  • →Clean taste with minimal mineral character — protected catchment effect
  • →No limescale on kettles or appliances — hardness 15–29 mg/L across all metro zones
  • →Slight chlorine taste occasionally in outer suburbs after long pipe runs
  • →Even Melbourne's hardest metro zone (Eltham ~29 mg/L) is softer than any Sydney zone

What a filter changes

  • →Carbon block removes residual chlorine taste — the only real improvement available
  • →TAC or salt softener is not needed — Melbourne water cannot form limescale
  • →Whole-home system is almost never justified in Melbourne
  • →Under-sink carbon for drinking water is the most cost-effective option if desired
What filter for Melbourne? A benchtop or under-sink carbon block is all you need — and even that is optional. Do not install a TAC or softener — there is no hardness to treat at 18 mg/L. Any supplier recommending hardness treatment in Melbourne is overselling. NSF 42 certified carbon if you do filter. Full Melbourne guide →
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Melbourne TAP WATER GUIDE Safe to drink? What's actually in it? What filter helps? ✓ Meets Australian Drinking Water Guidelines
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Is Melbourne tap water safe to drink?
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Melbourne WaterEAST VS WEST GUIDEGWW: chloramine — needs catalytic carbonYVW & SEW: free chlorine — any carbon18 mg/L average — no softener needed
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Melbourne WestGWW FILTER GUIDEGWW uses chloramine city-wideJug filters are ineffective hereCatalytic carbon or RO required
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Yarra Valley Water Drinking Water Quality Report 2023–24 · South East Water Annual Report 2023–24 · WaterScore: range 15–29 mg/L, avg ~18 mg/L
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4 SA Water supply zones · 2023–24 data · All metro zones use chloramine disinfection
Adelaide water quality

Adelaide has Australia's most challenging mains water — Murray River source with high TDS, chloramine, and the highest sodium of any capital city. Filtering makes a real, noticeable difference.

Hardness
100
mg/L avg
TDS
480
mg/L — highest capital
Disinfectant
Chloramine
all metro zones
Sodium
80
mg/L — highest capital
What filter for Adelaide? Catalytic carbon + TAC for scale is standard. Under-sink RO strongly recommended for drinking water — removes TDS, sodium and fluoride. Why does Adelaide water taste different? →
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Adelaide WaterWHY IT TASTES DIFFERENTMurray River source — end of basinChloramine needs catalytic carbonSodium highest of any capital
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Adelaide sits at the end of the Murray-Darling Basin. Murray salinity, chloramine disinfection, elevated sodiu…
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Adelaide SodiumKIDNEY & HEART GUIDE66–106 mg/L — highest in AustraliaSalt softeners increase sodiumRO (NSF 58) removes 90–97%
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Adelaide water sodium — what it means for kidney and heart patients
Adelaide averages 66 mg/L sodium — highest of any Australian capital. For CKD, dialysis and hypertension patie…
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Cost Guide2025 PRICES$400–$800: basic carbon (Melb/Syd)$1,400–$2,400: carbon + TAC (Perth/Bris)$2,500–$4,500: comprehensive outer zones
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Whole home water filter cost Australia 2025
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5 Seqwater supply zones · 2023–24 data · All zones use chloramine disinfection
Brisbane water quality

Brisbane's hardness varies dramatically by suburb — from 53 mg/L in North Lakes to 115 mg/L in inner Brisbane. All zones use chloramine, making catalytic carbon essential city-wide.

Inner Brisbane
115
mg/L — Hard
North (Moreton)
53
mg/L — Soft
Disinfectant
Chloramine
all SEQ zones
Fluoride
0.85
mg/L target
What filter for Brisbane? Catalytic carbon is essential for all zones. Inner Brisbane: TAC for scale. Northern suburbs: catalytic carbon only. Full Brisbane guide →
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Brisbane TAP WATER GUIDE Safe to drink? What's actually in it? What filter helps? ✓ Meets Australian Drinking Water Guidelines
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Is Brisbane tap water safe to drink?
Moderate hardness, chloramine disinfection, and outer suburbs harder than inner city. Here's what's in Brisban…
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Brisbane WaterHARDNESS BY SUBURBBrisbane zone: 115 mg/L (Mt Crosby)Moreton/north: 53 mg/L (North Pine)All zones: chloramine — catalytic carbon
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Brisbane water hardness by suburb — north vs south explained
Inner Brisbane gets 115 mg/L from Wivenhoe's basalt catchment. Northern suburbs get 53 mg/L from North Pine's …
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Brisbane WaterEARTHY TASTE GUIDEMIB & Geosmin — harmless but unpleasantConventional treatment can't remove themFresh carbon block removes 80–90%
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Why Brisbane water tastes earthy after rain — and what removes it
MIB and Geosmin from algal blooms cause the earthy taste after rain. It's safe, recurring, and conventional tr…
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Coffee WaterBY CITY GUIDESCA target: 75-250 mg/L TDSMelbourne: add mineralsAdelaide/Perth: RO + remineralise
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