How hard is the water in Kane County, IL?
25.7 grains per gallon
A softener will pay its way here.
The median hardness measured in Kane County, IL is 440 mg/L as calcium carbonate, which is 25.7 gpg. That is very hard on the USGS scale. It comes from 37 samples at 11 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 15.2 and 30.5 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 25.7 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 13.7 to 60.2 gpg
The softest single sample on record in Kane County was 234 mg/L and the hardest 1,030 mg/L, a 4-fold gap. The top quarter of sites read above 30.5 gpg and the bottom quarter below 15.2 gpg.
Wells 25.7 gpg, rivers and lakes 19.9 gpg
37 groundwater samples from 11 wells put the median at 440 mg/L. 198 surface samples from 17 sites put it at 340 mg/L. In Kane County the wells come out 5.8 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 40,000-grain unit covers a week between regenerations. Expect about 561 lb of salt a year (15 bags of 40 lb, about $101), 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 $201 a year.
Sizing at 25.7 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,542 | 24,000 | 188 lb |
| 2 | 3,084 | 24,000 | 375 lb |
| 4 | 6,168 | 48,000 | 750 lb |
| 6 | 9,252 | 80,000 | 1,126 lb |
Kane County against the rest of Illinois
Among the 102 Illinois counties with data, Kane County is number 4 of 102 counting from the hardest. Across the whole country it is harder than 92% of counties.
Softest in Illinois: Pope County at 4.3 gpg. Hardest: Cook County at 34.8 gpg. Closest to Kane County: Lee County (25.4), St. Clair County (24), Lake County (23.4).