How hard is the water in Pointe Coupee Parish, LA?
7.7 grains per gallon
A softener is worth it here.
The median hardness measured in Pointe Coupee Parish, LA is 132 mg/L as calcium carbonate, which is 7.7 gpg. That is hard on the USGS scale. It comes from 15 samples at 14 sites between 1990 and 2024, 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 0.3 and 20.1 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: medium (how it is measured).
What to do next
At 7.7 gpg a softener is worth getting, mainly to protect the water heater and cut soap use. Get at least two quotes, ask each installer what grain capacity they are fitting, and check it against the sizing table below. Because Pointe Coupee Parish 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 0.1 to 25.7 gpg
The softest single sample on record in Pointe Coupee Parish was 0.9 mg/L and the hardest 440 mg/L, a 489-fold gap. The top quarter of sites read above 20.1 gpg and the bottom quarter below 0.3 gpg. So even here some sites draw water soft enough to need nothing at all.
Wells 7.7 gpg, rivers and lakes 7.2 gpg
15 groundwater samples from 14 wells put the median at 131.5 mg/L. 762 surface samples from 7 sites put it at 123 mg/L. In Pointe Coupee Parish the wells come out 0.5 gpg harder. Groundwater sits in contact with rock for years and picks up calcium and magnesium as it goes, so wells usually read harder. The two sources are close, so the county figure should hold whichever one your tap is on.
What a softener would cost to run
For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 168 lb of salt a year (5 bags of 40 lb, about $30), 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 $130 a year.
Sizing at 7.7 gpg
| People | Grains a day | Unit | Salt a year |
|---|---|---|---|
| 1 | 462 | 24,000 | 56 lb |
| 2 | 924 | 24,000 | 112 lb |
| 4 | 1,848 | 24,000 | 225 lb |
| 6 | 2,772 | 24,000 | 337 lb |
Pointe Coupee Parish against the rest of Louisiana
Among the 64 Louisiana counties with data, Pointe Coupee Parish is number 33 of 64 counting from the hardest. Across the whole country it is harder than 41% of counties.
Softest in Louisiana: Lincoln Parish at 0.1 gpg. Hardest: St. Bernard Parish at 53.9 gpg. Closest to Pointe Coupee Parish: Morehouse Parish (7.7), Assumption Parish (7.6), Iberville Parish (7.8).