How hard is the water in Fauquier County, VA?
9.8 grains per gallon
A softener is worth it here.
The median hardness measured in Fauquier County, VA is 168 mg/L as calcium carbonate, which is 9.8 gpg. That is hard on the USGS scale. It comes from 17 samples at 13 sites between 1994 and 2026, drawn from groundwater wells, which is what most taps and private wells in the county draw on.
How much it varies here
Half the sites came in between 6.4 and 14.2 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 9.8 gpg a softener is worth getting, mainly to protect the water heater and cut soap use. Get at least two quotes, ask each installer what grain capacity they are fitting, and check it against the sizing table below. Because Fauquier County straddles a decision line, check your own tap with a $10 test strip before you spend anything.
More on sizing a softener for your household.
From 1.5 to 35.2 gpg
The softest single sample on record in Fauquier County was 25.6 mg/L and the hardest 602 mg/L, a 24-fold gap. The top quarter of sites read above 14.2 gpg and the bottom quarter below 6.4 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 9.8 gpg, rivers and lakes 2.5 gpg
17 groundwater samples from 13 wells put the median at 168 mg/L. 437 surface samples from 29 sites put it at 42.4 mg/L. In Fauquier County the wells come out 7.3 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. A utility here that draws from the river can deliver noticeably different water from a private well next door.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 214 lb of salt a year (6 bags of 40 lb, about $39), 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 $139 a year.
Sizing at 9.8 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 588 | 24,000 | 72 lb |
| 2 | 1,176 | 24,000 | 143 lb |
| 4 | 2,352 | 24,000 | 286 lb |
| 6 | 3,528 | 32,000 | 429 lb |
Fauquier County against the rest of Virginia
Among the 126 Virginia counties with data, Fauquier County is number 19 of 126 counting from the hardest. Across the whole country it is harder than 50% of counties.
Softest in Virginia: Isle of Wight County at 0.4 gpg. Hardest: Clarke County at 20.1 gpg. Closest to Fauquier County: Lexington city (10.1), York County (10.2), Virginia Beach city (10.3).