How hard is the water in East Carroll Parish, LA?
20.4 grains per gallon
A softener will pay its way here.
The median hardness measured in East Carroll Parish, LA is 349 mg/L as calcium carbonate, which is 20.4 gpg. That is very hard on the USGS scale. It comes from 6 samples at 5 sites between 1991 and 2022, 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 16.5 and 22 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
At 20.4 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 15.4 to 24.5 gpg
The softest single sample on record in East Carroll Parish was 264 mg/L and the hardest 419 mg/L, a 2-fold gap. The top quarter of sites read above 22 gpg and the bottom quarter below 16.5 gpg.
Wells 20.4 gpg, rivers and lakes 8.8 gpg
6 groundwater samples from 5 wells put the median at 349 mg/L. 64 surface samples from 5 sites put it at 150 mg/L. In East Carroll Parish the wells come out 11.6 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 32,000-grain unit covers a week between regenerations. Expect about 445 lb of salt a year (12 bags of 40 lb, about $80), 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 $180 a year.
Sizing at 20.4 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,224 | 24,000 | 149 lb |
| 2 | 2,448 | 24,000 | 298 lb |
| 4 | 4,896 | 40,000 | 596 lb |
| 6 | 7,344 | 64,000 | 894 lb |
East Carroll Parish against the rest of Louisiana
Among the 64 Louisiana counties with data, East Carroll Parish is number 11 of 64 counting from the hardest. Across the whole country it is harder than 85% of counties.
Softest in Louisiana: Lincoln Parish at 0.1 gpg. Hardest: St. Bernard Parish at 53.9 gpg. Closest to East Carroll Parish: Catahoula Parish (20), Rapides Parish (20.8), Madison Parish (21.6).