Water hardness in Keene
3.3 gpg soft
Tap water in Keene is soft: 3.3 gpg (56 mg/L · 3.1 °dH · 5.6 °fH).
Source: City of Keene 2025 Water Quality Report (unregulated substances table) (2025) · data checked 2026-11-02
Range across supply zones: 7–56 mg/L.
The City of Keene's 2025 water quality report lists 56.0 mg/L as the highest value, with a range of 7.0 to 56.0 mg/L. The data come from the report's unregulated substances table. The water is soft, so scale is rarely a problem.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 3.3 gpg |
|---|---|
| Utility | City of Keene Water |
How Keene compares
- Tap water in Keene is 64 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1195 of 1372 in the United States (1 = hardest); 13 % of these cities have softer water.
Ranking of the hardest and softest water in the United States →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Keene
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Keene water hard or soft?
It is soft: 56 mg/L as CaCO₃ (3.3 gpg, 3.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Keene safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
How many grains per gallon is Keene water?
3.3 gpg, equal to 3.1 °dH, 5.6 °fH or 56 mg/L calcium carbonate.
What dishwasher salt setting should I use in Keene?
For 56 mg/L (3.1 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Keene?
No. With soft water a softener adds nothing.
Source
Source: City of Keene 2025 Water Quality Report (unregulated substances table) (2025). Method: figure published by the water supplier. City of Keene 2025 Water Quality Report (unregulated substances table) · Outdated figure? Tell us