How hard is the water in Montgomery County, PA?
12.3 grains per gallon
A softener will pay its way here.
The median hardness measured in Montgomery County, PA is 211 mg/L as calcium carbonate, which is 12.3 gpg. That is very hard on the USGS scale. It comes from 101 samples at 65 sites between 1990 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 7.7 and 15.7 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 12.3 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. Because Montgomery 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 3.7 to 73.0 gpg
The softest single sample on record in Montgomery County was 63.5 mg/L and the hardest 1,250 mg/L, a 20-fold gap. The top quarter of sites read above 15.7 gpg and the bottom quarter below 7.7 gpg.
Wells 12.3 gpg, rivers and lakes 8.9 gpg
101 groundwater samples from 65 wells put the median at 211 mg/L. 1,080 surface samples from 33 sites put it at 152 mg/L. In Montgomery County the wells come out 3.4 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 269 lb of salt a year (7 bags of 40 lb, about $48), 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 $148 a year.
Sizing at 12.3 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 738 | 24,000 | 90 lb |
| 2 | 1,476 | 24,000 | 180 lb |
| 4 | 2,952 | 24,000 | 359 lb |
| 6 | 4,428 | 32,000 | 539 lb |
Montgomery County against the rest of Pennsylvania
Among the 67 Pennsylvania counties with data, Montgomery County is number 19 of 67 counting from the hardest. Across the whole country it is harder than 60% of counties.
Softest in Pennsylvania: Cameron County at 1.4 gpg. Hardest: Clarion County at 68.2 gpg. Closest to Montgomery County: Schuylkill County (11.8), Franklin County (13), Fayette County (11.4).