Utilities / New Hampshire

New Hampshire water hardness

1 New Hampshire system with a hardness figure read from an official page on 2026-10-16. This is not a list of every utility in New Hampshire; it is the list of those whose published figure has been verified here.

Soft Soft 0–60

Moderately hard Moderate 61–120

Hard Hard 121–180

Very hard Very hard 181+

Manchester, NH 17.9 mg/L 1 gpg Soft

mg/L as calcium carbonate. Each classification band is drawn the same width, so the axis is not linear in mg/L.

New Hampshire systems on the USGS classification. Each row links to that system's published figure, report year and conversion. Grains per gallon are the utility's own figure where it published one, and our conversion at 17.1 mg/L per grain where it did not.

Manchester, NH — Manchester Water Works 17.9 mg/L (1 gpg) Soft Published range 16.7–18.8 mg/L. Manchester Water Works annual water quality report, Reporting Year 2022. Retrieved 2026-10-16.

Other states with verified systems

All verified systems Convert a figure from your own report How to read a water quality report