Water Hardness in New Hampshire

10 counties — Average 27.2 PPM (Soft)

9
1
Soft (90.0%) Moderate (10.0%) Hard (0.0%) Very Hard (0.0%)

New Hampshire Water Hardness Map

Soft   Moderate   Hard   Very Hard

New Hampshire

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All 10 Counties — By Water Hardness

CountyClassificationHardness
Belknap Soft 50 PPM
Carroll Soft 12.1 PPM
Cheshire Soft 18.3 PPM
Coos Soft 18.4 PPM
Grafton Soft 21 PPM
Hillsborough Soft 19 PPM
Merrimack Soft 18.2 PPM
Rockingham Moderate 69 PPM
Strafford Soft 22 PPM
Sullivan Soft 23.7 PPM

Source: USGS Water Quality Portal

Frequently Asked Questions

How hard is the water in New Hampshire?

New Hampshire has an average water hardness of 27.2 PPM, classified as soft. Out of 10 counties, 9 have soft water, 1 moderately hard, 0 hard, and 0 very hard.

Which New Hampshire counties have the hardest water?

See the county table above for a complete breakdown by hardness level.

How do I check water hardness for my New Hampshire address?

Enter your ZIP code in the search box above to see your area's estimated water hardness, classification, and water utility information.