How hard is the water in Lea County, NM?

17.4 grains per gallon

A softener will pay its way here.

The median hardness measured in Lea County, NM is 299 mg/L as calcium carbonate, which is 17.4 gpg. That is very hard on the USGS scale. It comes from 8 samples at 8 sites between 2001 and 2023, 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 11.4 and 20.2 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

At 17.4 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 9.9 to 28.7 gpg

The softest single sample on record in Lea County was 170 mg/L and the hardest 491 mg/L, a 3-fold gap. The top quarter of sites read above 20.2 gpg and the bottom quarter below 11.4 gpg.

What a softener would cost to run

For a household of 3, a 24,000-grain unit covers a week between regenerations. Expect about 381 lb of salt a year (10 bags of 40 lb, about $69), 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 $169 a year.

Sizing at 17.4 gpg

Lea County against the rest of New Mexico

Among the 33 New Mexico counties with data, Lea County is number 11 of 33 counting from the hardest. Across the whole country it is harder than 77% of counties.

Softest in New Mexico: Rio Arriba County at 2.3 gpg. Hardest: Chaves County at 116.2 gpg. Closest to Lea County: Doña Ana County (16.5), Cibola County (16.5), Quay County (18.5).