How hard is the water in Alexandria city, VA?
4.4 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Alexandria city, VA is 75 mg/L as calcium carbonate, which is 4.4 gpg. That is moderately hard on the USGS scale. It comes from 175 samples at 6 sites between 2001 and 2026, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 3 and 6.3 gpg. That spread crosses a decision line, so some homes here land on a different answer. A $10 test strip on your own tap settles it. Confidence in the county figure: medium (how it is measured).
What to do next
At 4.4 gpg this is your call. Look for white film on glasses and crust on the shower head: if you see little of either, you can live without one. If you do want one, a 24,000-grain unit is enough, so ask for that size rather than a bigger one. Because Alexandria city straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on when a softener is not worth it.
From 2.3 to 7.3 gpg
The softest single sample on record in Alexandria city was 39.4 mg/L and the hardest 125 mg/L, a 3-fold gap. The top quarter of sites read above 6.3 gpg and the bottom quarter below 3 gpg.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 95 lb of salt a year (3 bags of 40 lb, about $17), and roughly 2,346 gallons of regeneration water. Installed, most units run $1,000 to $4,500; spread over 15 years with salt, that is about $117 a year.
Sizing at 4.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 264 | 24,000 | 32 lb |
| 2 | 528 | 24,000 | 64 lb |
| 4 | 1,056 | 24,000 | 128 lb |
| 6 | 1,584 | 24,000 | 193 lb |
Alexandria city against the rest of Virginia
Among the 126 Virginia counties with data, Alexandria city is number 47 of 126 counting from the hardest. Across the whole country it is harder than 28% of counties.
Softest in Virginia: Isle of Wight County at 0.4 gpg. Hardest: Clarke County at 20.1 gpg. Closest to Alexandria city: Highland County (4.4), Waynesboro city (4.5), Wise County (4.2).