How hard is the water in Madison Parish, LA?
21.6 grains per gallon
A softener will pay its way here.
The median hardness measured in Madison Parish, LA is 370 mg/L as calcium carbonate, which is 21.6 gpg. That is very hard on the USGS scale. It comes from 15 samples at 11 sites between 1990 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 19.3 and 24.4 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 21.6 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 14.9 to 46.1 gpg
The softest single sample on record in Madison Parish was 255 mg/L and the hardest 790 mg/L, a 3-fold gap. The top quarter of sites read above 24.4 gpg and the bottom quarter below 19.3 gpg.
Wells 21.6 gpg, rivers and lakes 6.7 gpg
15 groundwater samples from 11 wells put the median at 370 mg/L. 129 surface samples from 5 sites put it at 115.5 mg/L. In Madison Parish the wells come out 14.9 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 472 lb of salt a year (12 bags of 40 lb, about $85), 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 $185 a year.
Sizing at 21.6 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 1,296 | 24,000 | 158 lb |
| 2 | 2,592 | 24,000 | 315 lb |
| 4 | 5,184 | 40,000 | 631 lb |
| 6 | 7,776 | 64,000 | 946 lb |
Madison Parish against the rest of Louisiana
Among the 64 Louisiana counties with data, Madison Parish is number 9 of 64 counting from the hardest. Across the whole country it is harder than 87% of counties.
Softest in Louisiana: Lincoln Parish at 0.1 gpg. Hardest: St. Bernard Parish at 53.9 gpg. Closest to Madison Parish: Tensas Parish (21.8), Rapides Parish (20.8), Natchitoches Parish (22.7).