How hard is the water in Garrett County, MD?
4.3 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Garrett County, MD is 73 mg/L as calcium carbonate, which is 4.3 gpg. That is moderately hard on the USGS scale. It comes from 245 samples at 75 sites between 1990 and 2023, 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 2.6 and 8.9 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: high (how it is measured).
What to do next
At 4.3 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 Garrett County 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 0.1 to 92.3 gpg
The softest single sample on record in Garrett County was 2.4 mg/L and the hardest 1,580 mg/L, a 658-fold gap. The top quarter of sites read above 8.9 gpg and the bottom quarter below 2.6 gpg.
Wells 4.3 gpg, rivers and lakes 8.1 gpg
245 groundwater samples from 75 wells put the median at 73 mg/L. 73 surface samples from 14 sites put it at 139.5 mg/L. In Garrett County the rivers and lakes come out 3.8 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. A utility here that draws from the aquifer 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 93 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 4.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 258 | 24,000 | 31 lb |
| 2 | 516 | 24,000 | 63 lb |
| 4 | 1,032 | 24,000 | 126 lb |
| 6 | 1,548 | 24,000 | 188 lb |
Garrett County against the rest of Maryland
Among the 24 Maryland counties with data, Garrett County is number 13 of 24 counting from the hardest. Across the whole country it is harder than 27% of counties.
Softest in Maryland: Charles County at 0.3 gpg. Hardest: Washington County at 18.5 gpg. Closest to Garrett County: Worcester County (4.4), Queen Anne's County (3.7), Harford County (4.8).