How hard is the water in Sullivan County, PA?
4.3 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in Sullivan County, PA is 74 mg/L as calcium carbonate, which is 4.3 gpg. That is moderately hard on the USGS scale. It comes from 62 samples at 25 sites between 1998 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 2.5 and 4.9 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 Sullivan 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 0.7 to 8.5 gpg
The softest single sample on record in Sullivan County was 11.8 mg/L and the hardest 145 mg/L, a 12-fold gap. The top quarter of sites read above 4.9 gpg and the bottom quarter below 2.5 gpg.
Wells 4.3 gpg, rivers and lakes 1.2 gpg
62 groundwater samples from 25 wells put the median at 74.4 mg/L. 428 surface samples from 23 sites put it at 20 mg/L. In Sullivan County the wells come out 3.1 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 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 4.3 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 |
Sullivan County against the rest of Pennsylvania
Among the 67 Pennsylvania counties with data, Sullivan County is number 51 of 67 counting from the hardest. Across the whole country it is harder than 28% of counties.
Softest in Pennsylvania: Cameron County at 1.4 gpg. Hardest: Clarion County at 68.2 gpg. Closest to Sullivan County: Montour County (4.3), Pike County (4.3), Wayne County (4.4).