How hard is the water in McKean County, PA?
5.2 grains per gallon
Optional: a softener helps, but plenty of homes skip it.
The median hardness measured in McKean County, PA is 89 mg/L as calcium carbonate, which is 5.2 gpg. That is moderately hard on the USGS scale. It comes from 9 samples at 6 sites between 1992 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 2.9 and 8.2 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 5.2 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 McKean 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 1.9 to 11.9 gpg
The softest single sample on record in McKean County was 33.3 mg/L and the hardest 203.8 mg/L, a 6-fold gap. The top quarter of sites read above 8.2 gpg and the bottom quarter below 2.9 gpg.
Wells 5.2 gpg, rivers and lakes 1.5 gpg
9 groundwater samples from 6 wells put the median at 89.3 mg/L. 1,246 surface samples from 25 sites put it at 26 mg/L. In McKean County the wells come out 3.7 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 114 lb of salt a year (3 bags of 40 lb, about $21), 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 $121 a year.
Sizing at 5.2 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 312 | 24,000 | 38 lb |
| 2 | 624 | 24,000 | 76 lb |
| 4 | 1,248 | 24,000 | 152 lb |
| 6 | 1,872 | 24,000 | 228 lb |
McKean County against the rest of Pennsylvania
Among the 67 Pennsylvania counties with data, McKean County is number 45 of 67 counting from the hardest. Across the whole country it is harder than 31% of counties.
Softest in Pennsylvania: Cameron County at 1.4 gpg. Hardest: Clarion County at 68.2 gpg. Closest to McKean County: Susquehanna County (5.2), Mercer County (5.3), Chester County (4.9).