How hard is the water in Cass County, MI?
11.7 grains per gallon
A softener will pay its way here.
The median hardness measured in Cass County, MI is 200 mg/L as calcium carbonate, which is 11.7 gpg. That is very hard on the USGS scale. It comes from 35 samples at 26 sites between 2001 and 2022, drawn from every sampling site in the county, wells and surface water together.
How much it varies here
Half the sites came in between 9.9 and 13.3 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 11.7 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. Because Cass 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 1.6 to 20.6 gpg
The softest single sample on record in Cass County was 28 mg/L and the hardest 353 mg/L, a 13-fold gap. The top quarter of sites read above 13.3 gpg and the bottom quarter below 9.9 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 20.2 gpg, rivers and lakes 11.7 gpg
4 groundwater samples from 2 wells put the median at 346 mg/L. 31 surface samples from 24 sites put it at 200 mg/L. In Cass County the wells come out 8.5 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 255 lb of salt a year (7 bags of 40 lb, about $46), 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 $146 a year.
Sizing at 11.7 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 702 | 24,000 | 85 lb |
| 2 | 1,404 | 24,000 | 171 lb |
| 4 | 2,808 | 24,000 | 342 lb |
| 6 | 4,212 | 32,000 | 512 lb |
Cass County against the rest of Michigan
Among the 82 Michigan counties with data, Cass County is number 31 of 82 counting from the hardest. Across the whole country it is harder than 57% of counties.
Softest in Michigan: Luce County at 1.9 gpg. Hardest: Wayne County at 47.4 gpg. Closest to Cass County: Kalamazoo County (11.7), St. Joseph County (11.7), Calhoun County (11.6).