How hard is the water in LaSalle Parish, LA?

1.5 grains per gallon

You do not need a softener here.

The median hardness measured in LaSalle Parish, LA is 26 mg/L as calcium carbonate, which is 1.5 gpg. That is soft on the USGS scale. It comes from 396 samples at 9 sites between 2007 and 2024, drawn from every sampling site in the county, wells and surface water together.

How much it varies here

Half the sites came in between 1.3 and 2.2 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: medium (how it is measured).

What to do next

You can skip the softener. At 1.5 gpg the most a softener would fix is the odd water spot. If a salesperson in LaSalle Parish says otherwise, ask to see their reading in grains per gallon and compare it with this one.

More on when a softener is not worth it.

From 1.0 to 4.1 gpg

The softest single sample on record in LaSalle Parish was 16.6 mg/L and the hardest 70 mg/L, a 4-fold gap. The top quarter of sites read above 2.2 gpg and the bottom quarter below 1.3 gpg.

LaSalle Parish against the rest of Louisiana

Among the 64 Louisiana counties with data, LaSalle Parish is number 45 of 64 counting from the hardest. Across the whole country it is harder than 12% of counties.

Softest in Louisiana: Lincoln Parish at 0.1 gpg. Hardest: St. Bernard Parish at 53.9 gpg. Closest to LaSalle Parish: Ouachita Parish (1.6), Webster Parish (1.6), De Soto Parish (1.1).