Water hardness in New Hampshire

Typical New Hampshire tap water
20mg/L
1.2gpg
Soft

Population-weighted middle value across 20 New Hampshire cities in the dataset

People with hard or very hard water
14%
Hardest
Portsmouth 123
Softest
Concord 13

We have hardness numbers for 10 New Hampshire cities; 5 of them are county estimates rather than utility figures. Each city page adds the water system's EPA violation record and a softener size for a typical household.

Every New Hampshire city on the hardness scale
SoftModerately hardHardVery hard060120180240300360+Manchester: 16 mg/LNashua: 31 mg/LConcord: 13 mg/LDover: 64 mg/LRochester: 20 mg/LKeene: 15 mg/LPortsmouth: 123 mg/LDerry: 123 mg/LLebanon: 22 mg/LHudson: 31 mg/LManchesterDoverPortsmouthSoftMod.HardVery hard060120180240300360+Manchester: 16 mg/LNashua: 31 mg/LConcord: 13 mg/LDover: 64 mg/LRochester: 20 mg/LKeene: 15 mg/LPortsmouth: 123 mg/LDerry: 123 mg/LLebanon: 22 mg/LHudson: 31 mg/LManchester

Dot size follows population. Tap a dot for the city page.

7Soft
1Moderately hard
2Hard
0Very hard

Hardest water in New Hampshire

  1. Portsmouth123
  2. Derry123
  3. Dover64
  4. Nashua31
  5. Hudson31
  6. Lebanon22
  7. Rochester20
  8. Manchester16

Softest water in New Hampshire

  1. Concord13
  2. Keene15
  3. Manchester16
  4. Rochester20
  5. Lebanon22
  6. Hudson31
  7. Nashua31
  8. Dover64

All cities in New Hampshire

Citymg/LgpgClassDataEPA health violations
Manchester160.9SoftUtility report0
Nashua311.8SoftUtility report0
Concord130.8SoftCounty estimate0
Dover643.8Moderately hardUtility report0
Rochester201.1SoftCounty estimate3
Keene150.9SoftCounty estimate0
Portsmouth1237.2HardCounty estimate0
Derry1237.2HardCounty estimate0
Lebanon221.3SoftUtility report1
Hudson311.8SoftUtility report0

Questions

Is New Hampshire water hard?

The typical New Hampshire resident gets about 20 mg/L (1.2 gpg), which is soft. About 14% of people in the cities we track have hard or very hard water.

Which city in New Hampshire has the hardest water?

Among 10 cities with pages here, Portsmouth is highest at 123 mg/L.

Which city in New Hampshire has the softest water?

Concord, at 13 mg/L.

Other states

Hardness data: TapWaterData US Water Hardness, CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.