Does Hobart Have Hard Water?

No. Hobart has very soft tap water.

With hardness levels averaging around 28 mg/L across Greater Hobart, the city’s water sits well below the “soft” threshold of 60 mg/L and far under the ADWG aesthetic guideline of 200 mg/L. If you’ve moved to Hobart from Adelaide or Perth, you’ve probably already noticed the difference — the kettle stays clean, soap lathers easily, and the water tastes neutral.

Here’s exactly how soft Hobart’s water is, how it varies across the city, and what it means for your home.

How Hard Is Hobart’s Water?

Hobart’s tap water ranges from about 17 mg/L on the western shore through to 46 mg/L on parts of the eastern shore. TasWater splits Greater Hobart into five supply zones, and all five fall into the soft category:

Greater Hobart Zone	Typical Hardness (mg/L)	Suburbs Covered
Kingborough	17	Kingston, Blackmans Bay
Hobart	24	Hobart, North Hobart, South Hobart, Sandy Bay, Battery Point, New Town, Taroona
Glenorchy	30	Glenorchy, Moonah, Claremont, Berriedale, West Moonah
New Norfolk	41	New Norfolk, Granton, Boyer
Clarence	46	Bellerive, Rosny Park, Howrah, Lindisfarne, Tranmere, Risdon Vale

The softest Greater Hobart zone is Kingborough at just 17 mg/L — about the same as inner Melbourne. The hardest is Clarence at 46 mg/L, which is still classified as soft and well under the level where you’d notice scale on a kettle.

For comparison, here’s how Hobart stacks up against other Australian capitals:

City	Average Hardness (mg/L)	Classification
Hobart	28	Soft
Melbourne	18	Soft
Sydney	43	Soft
Brisbane	68	Soft to moderately hard
Adelaide	103	Moderately hard
Perth	150+	Hard to very hard

Hobart sits firmly in soft-water territory, second only to Melbourne among the capitals. It’s a different world from Adelaide, where residents deal with limescale and stubborn soap scum.

Hobart Water Hardness by Suburb

Here’s a breakdown of common Hobart suburbs and their hardness readings, based on TasWater’s reported supply zones:

Suburb	Supply Zone	Hardness (mg/L)
Kingston	Kingborough	17
Blackmans Bay	Kingborough	17
Hobart (CBD)	Hobart	24
North Hobart	Hobart	24
South Hobart	Hobart	24
West Hobart	Hobart	24
Sandy Bay	Hobart	24
Battery Point	Hobart	24
New Town	Hobart	24
Lenah Valley	Hobart	24
Taroona	Hobart	24
Glenorchy	Glenorchy	30
Moonah	Glenorchy	30
Claremont	Glenorchy	30
Berriedale	Glenorchy	30
New Norfolk	New Norfolk	41
Lindisfarne	Clarence	46
Bellerive	Clarence	46
Rosny Park	Clarence	46
Howrah	Clarence	46
Risdon Vale	Clarence	46

Every reading here is soft. The 30 mg/L spread between Kingston and Howrah is real but practically invisible — neither will leave scale on your kettle, and your soap will behave the same way in both.

Where Does Hobart’s Water Come From?

Most of Greater Hobart’s drinking water is treated at the Bryn Estyn Water Treatment Plant, which draws from the Derwent River near New Norfolk. The Derwent itself collects water from a chain of hydro lakes and tributaries that flow off the Central Highlands.

A smaller share of Hobart’s supply comes from Ridgeway and Mt Wellington catchments — forested slopes that drain into reservoirs above the city. These contribute to the Hobart and Glenorchy zones in particular.

Both source types share a key feature: the catchment geology is dominated by dolerite, sandstone and quartzite. None of these dissolve much calcium or magnesium into the water as it flows through. The result is water with very low TDS (around 73 mg/L on average) and very low hardness.

Compare this to Brisbane, where Seqwater draws from dams in catchments with more mineral-rich rock. Or Adelaide, where the Murray River flows thousands of kilometres through limestone country. Hobart’s catchments simply don’t add minerals the way other Australian sources do.

Hobart vs the Rest of Tasmania

While Greater Hobart is soft, Tasmania as a whole has more variation. TasWater operates over 60 supply zones across the state, and a handful of regional towns do see moderately hard water:

Regional TAS Zone	Hardness (mg/L)	Classification
St Marys	153	Hard
Cornwall	143	Moderately hard
Conara	115	Moderately hard
Lady Barron (Flinders Is)	85	Moderately hard
Orford	84	Moderately hard
Bothwell	80	Soft to moderately hard

These are small towns drawing from local catchments or bore water that picks up more dissolved minerals. They’re the exception, not the rule. State-wide, TasWater’s average hardness is just 37 mg/L — still well inside the soft range.

For most Tasmanians, including everyone in Greater Hobart, soft water is the norm.

What Soft Water Means for Your Home

Hobart’s soft water has a few practical benefits you might not connect to hardness at all:

Appliances last longer. Scale buildup inside kettles, dishwashers, and hot water systems is minimal. In hard water cities, limescale can reduce heating efficiency and shorten equipment lifespan. Hobart residents rarely need to descale anything.

Soap lathers easily. Hard water reacts with soap to form a scummy residue. With Hobart’s 17-46 mg/L water, shampoo, dishwashing liquid and laundry detergent all work as expected. You’ll use less product than someone in Adelaide or Perth.

Skin and hair feel different. Many people find soft water gentler. If you’ve moved from a hard water city and your hair feels softer or your skin is less dry, Hobart’s low mineral content is the likely reason.

No softener needed. A water softener in Hobart would be a waste of money. If you want to filter anything, target chlorine taste with a simple carbon filter. See our best water filter for Hobart guide for options.

What You Can Do

1. Check your suburb’s exact reading. Look up your address on WaterScore’s Hobart water quality page to see hardness and other parameters for your supply zone.
2. Try the water hardness calculator to convert mg/L into ppm, grains per gallon, or German degrees if you’re comparing imported appliances.
3. Test at home. A TDS metre from Bunnings ($15-30) measures dissolved solids. Hobart homes typically read 40-120 mg/L TDS. For hardness specifically, use a drop-test kit.
4. Skip the water softener. Spend the money on a carbon filter for chlorine taste instead, if that’s a concern.
5. Contact your utility. TasWater publishes annual drinking water quality data and will send you a report for your supply zone on request.

Frequently Asked Questions

Does Hobart have hard or soft water?

Hobart has soft water. The average hardness across Greater Hobart suburbs is around 28 mg/L, well below the 60 mg/L threshold for soft water. Even the hardest Greater Hobart zone (Clarence) only reaches 46 mg/L.

What is Hobart’s water hardness in mg/L?

Hobart’s water hardness ranges from 17 mg/L in Kingston to 46 mg/L on the Eastern Shore. The Hobart CBD, Sandy Bay, Battery Point and North Hobart all sit at around 24 mg/L. Glenorchy and Moonah are slightly higher at 30 mg/L.

Does TasWater supply hard water?

Across Tasmania the picture is mixed, but for Greater Hobart TasWater supplies soft water. All five Greater Hobart supply zones come in under 50 mg/L hardness, with the CBD zone fed by Bryn Estyn at just 24 mg/L.

Do I need a water softener in Hobart?

No. Hobart’s water is already naturally soft at 17-46 mg/L. A water softener would offer no benefit. If you want to improve taste, a carbon filter to reduce chlorine is a better investment.

Why is Hobart’s water so soft?

Hobart’s water comes from the Derwent River catchment and forested slopes around Mt Wellington. Rainwater filters through dolerite and quartzite, neither of which dissolves much calcium or magnesium. With so few minerals picked up along the way, the water arrives at the tap soft and low in TDS.

Is Hobart water hardness the same as Launceston?

Not quite. Launceston’s four supply zones average around 36 mg/L — still soft, but slightly harder than central Hobart. Both cities are firmly in the soft category, well under 60 mg/L.

Summary

Hobart does not have hard water. With Greater Hobart hardness averaging around 28 mg/L across all five TasWater supply zones, it sits among Australia’s softest capital city water. Unless you’ve moved here from interstate and brought a softener with you, water hardness is something you can ignore entirely in Hobart. For full suburb-by-suburb data, see our Hobart water quality breakdown.

Sources

1. TasWater — Drinking Water Quality Reports, TasWater
2. NHMRC — Australian Drinking Water Guidelines, NHMRC
3. Bryn Estyn Water Treatment Plant — Project Overview, TasWater
4. Tasmanian Department of Health — Public Health Drinking Water Standards, Tasmanian Government
5. WaterScore — Hobart Water Quality Data, WaterScore