softwater.io

National water quality reference

How hard is the water where you live?

softwater.io publishes water hardness by municipality in both grains per gallon and mg/L, together with the water system that supplies the town and the report the figure was taken from. Nothing here is estimated: if a figure has not been read from a source document, the field stays empty.

New Jersey hardness dataSearch the full data table
Town records
160
Hardest on record
East Orange · 25.9 gpg
Softest on record
Bloomfield · 2.6 gpg

What hard water is, in one paragraph

Hardness is the total dissolved calcium and magnesium in water, reported either as mg/L of calcium carbonate equivalent or as grains per gallon (1 gpg = 17.1 mg/L). It is a nuisance parameter, not a health contaminant: the EPA sets no limit on it. Water picks up those minerals from the rock it moves through, so towns sitting over limestone usually test far harder than towns supplied by surface reservoirs. Above roughly 7 grains per gallon, scale on fixtures and inside water heaters becomes the practical issue.

Coverage by state

How this resource is built

  • One record per town

    Every page reads from a single database of towns, water systems and reported figures — update a record and the page changes with it.

  • Sourced, not estimated

    Each figure carries the name of the consumer confidence report or state agency document it was read from, plus its publication year.

  • Structured for reuse

    Tables are marked up as datasets so search engines and answer engines can extract and attribute the values.