Water Hardness Atlas ZIP / postcode

Water hardness in Vienna

7.5 gpg hard

Tap water in Vienna is hard: 7.5 gpg (128 mg/L · 7.2 °dH · 12.8 °fH).

<6060–120120–180>180 mg/L

Source: Town of Vienna 2022 Annual Water Quality Report (2021 data) (2022) · data checked 2026-10-29

Range across supply zones: 86–171 mg/L.

This figure is over 3 years old; hardness may have changed.

The Town of Vienna, Virginia, distributes water supplied by Fairfax Water. Its 2022 report (2021 data) gives a computed hardness of 128.4 mg/L, with a range of 85.6 to 171.2 mg/L over the year. That is hard water, so expect scale on kettles and water heaters. The figure is a few years old, so newer reports may differ.

USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.

Water data

Total hardness7.5 gpg
UtilityTown of Vienna (water from Fairfax Water)

How Vienna compares

Ranking of the hardest and softest water in the United States →

What it means at home

How much salt will you use for softening?

Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.

Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).

Estimates for planning, not a quote. Check your appliance manual for exact settings.

Dishwasher setting in Vienna

BrandSetting for this water
BoschH01
Miele7 °dH
AEG / Electrolux2
Beko2nd
HooverS1
LGH2

From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →

FAQ

Is Vienna water hard or soft?

It is hard: 128 mg/L as CaCO₃ (7.5 gpg, 7.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.

Is tap water in Vienna safe to drink?

Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.

How many grains per gallon is Vienna water?

7.5 gpg, equal to 7.2 °dH, 12.8 °fH or 128 mg/L calcium carbonate.

What dishwasher salt setting should I use in Vienna?

For 128 mg/L (7.2 °dH) check your manufacturer's table: level 4–5.

Do I need a water softener in Vienna?

Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.

Source

Source: Town of Vienna 2022 Annual Water Quality Report (2021 data) (2022). Method: computed from supplier's calcium and magnesium. Town of Vienna 2022 Annual Water Quality Report (2021 data) · Outdated figure? Tell us

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