How hard is the water in Lake County, IN?
15.7 grains per gallon
A softener will pay its way here.
The median hardness measured in Lake County, IN is 269 mg/L as calcium carbonate, which is 15.7 gpg. That is very hard on the USGS scale. It comes from 94 samples at 48 sites between 1990 and 2021, 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 11 and 19.5 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 15.7 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 0.2 to 137.9 gpg
The softest single sample on record in Lake County was 3.8 mg/L and the hardest 2,360 mg/L, a 621-fold gap. The top quarter of sites read above 19.5 gpg and the bottom quarter below 11 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 15.7 gpg, rivers and lakes 16.6 gpg
94 groundwater samples from 48 wells put the median at 268.5 mg/L. 975 surface samples from 72 sites put it at 284 mg/L. In Lake County the rivers and lakes come out 0.9 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. The two sources are close, so the county figure should hold whichever one your tap is on.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 343 lb of salt a year (9 bags of 40 lb, about $62), 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 $162 a year.
Sizing at 15.7 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 942 | 24,000 | 115 lb |
| 2 | 1,884 | 24,000 | 229 lb |
| 4 | 3,768 | 32,000 | 458 lb |
| 6 | 5,652 | 40,000 | 688 lb |
Lake County against the rest of Indiana
Among the 91 Indiana counties with data, Lake County is number 56 of 91 counting from the hardest. Across the whole country it is harder than 71% of counties.
Softest in Indiana: Brown County at 3.8 gpg. Hardest: Warrick County at 40.3 gpg. Closest to Lake County: Clay County (15.9), LaPorte County (15.5), Wabash County (15.3).