How hard is the water in Gloucester County, NJ?

1.6 grains per gallon

You do not need a softener here.

The median hardness measured in Gloucester County, NJ is 27 mg/L as calcium carbonate, which is 1.6 gpg. That is soft on the USGS scale. It comes from 417 samples at 212 sites between 1990 and 2025, 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 0.7 and 2.7 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: high (how it is measured).

What to do next

You can skip the softener. At 1.6 gpg the most a softener would fix is the odd water spot. If a salesperson in Gloucester County 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 0.1 to 17.8 gpg

The softest single sample on record in Gloucester County was 2 mg/L and the hardest 305 mg/L, a 153-fold gap. The top quarter of sites read above 2.7 gpg and the bottom quarter below 0.7 gpg. So even in a soft county, a handful of wells here produce water hard enough to scale a heater.

Wells 1.6 gpg, rivers and lakes 2.6 gpg

417 groundwater samples from 212 wells put the median at 27.1 mg/L. 1,135 surface samples from 56 sites put it at 44.7 mg/L. In Gloucester County the rivers and lakes come out 1.0 gpg harder. Here the surface water reads harder than the wells, which often points to streams fed by limestone springs or irrigation return flow. The two sources are close, so the county figure should hold whichever one your tap is on.

Gloucester County against the rest of New Jersey

Among the 21 New Jersey counties with data, Gloucester County is number 19 of 21 counting from the hardest. Across the whole country it is harder than 13% of counties.

Softest in New Jersey: Ocean County at 0.8 gpg. Hardest: Hudson County at 17.2 gpg. Closest to Gloucester County: Atlantic County (0.9), Camden County (2.3), Ocean County (0.8).