How hard is the water in Lancaster County, PA?
19 grains per gallon
A softener will pay its way here.
The median hardness measured in Lancaster County, PA is 326 mg/L as calcium carbonate, which is 19 gpg. That is very hard on the USGS scale. It comes from 251 samples at 89 sites between 1993 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 15 and 21.1 gpg. The whole middle of that range gives the same answer, so a test of your own tap is unlikely to change it. Confidence in the county figure: high (how it is measured).
What to do next
At 19 gpg a softener pays its way here. Before you buy, check the quoted unit's grain capacity against the sizing table below, and ask whether it regenerates on demand, which uses less salt than a timer. Call your utility for its own report if you are on city water.
More on sizing a softener for your household.
From 0.3 to 37.4 gpg
The softest single sample on record in Lancaster County was 5.3 mg/L and the hardest 640 mg/L, a 121-fold gap. The top quarter of sites read above 21.1 gpg and the bottom quarter below 15 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 19 gpg, rivers and lakes 6.9 gpg
251 groundwater samples from 89 wells put the median at 326 mg/L. 4,192 surface samples from 157 sites put it at 118 mg/L. In Lancaster County the wells come out 12.1 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 416 lb of salt a year (11 bags of 40 lb, about $75), 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 $175 a year.
Sizing at 19 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,140 | 24,000 | 139 lb |
| 2 | 2,280 | 24,000 | 277 lb |
| 4 | 4,560 | 32,000 | 555 lb |
| 6 | 6,840 | 48,000 | 832 lb |
Lancaster County against the rest of Pennsylvania
Among the 67 Pennsylvania counties with data, Lancaster County is number 11 of 67 counting from the hardest. Across the whole country it is harder than 82% of counties.
Softest in Pennsylvania: Cameron County at 1.4 gpg. Hardest: Clarion County at 68.2 gpg. Closest to Lancaster County: Mifflin County (19.5), Butler County (18.3), Centre County (18.1).