Water hardness in Stamford CT
3 gpg soft
Tap water in Stamford CT is soft: 3 gpg (51 mg/L · 2.9 °dH · 5.1 °fH).
Source: Aquarion 2025 Water Quality Report (Stamford system) (2025) · data checked 2026-10-19
Range across supply zones: 34–69 mg/L.
Aquarion's 2025 report for the Stamford system gives an average hardness of 51.4 mg/L (3.0 gpg), with a range of 34.2 to 68.5 mg/L. The water is soft on average and reaches the moderate band at the top of the range. Scale is minor, and a softener is not needed for hardness.
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Water data
| Total hardness | 3 gpg |
|---|---|
| Utility | Aquarion Water Company of Connecticut (Stamford system, PWS CT1350011) |
How Stamford CT compares
- Tap water in Stamford CT is 67 % softer than the median of the 1372 cities we track in the United States (9.1 gpg).
- By hardness it ranks 1215 of 1372 in the United States (1 = hardest); 11 % of these cities have softer water.
- In Connecticut it is number 1 of 4 cities; the regional median is 3 gpg.
- Nearest city with clearly softer water: Hempstead, 39 km away (1.6 gpg).
- Nearest city with clearly harder water: West New York, 49 km away (9.1 gpg).
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 Stamford CT
| 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 Stamford CT water hard or soft?
It is soft: 51 mg/L as CaCO₃ (3 gpg, 2.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Stamford CT 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 Stamford CT water?
3 gpg, equal to 2.9 °dH, 5.1 °fH or 51 mg/L calcium carbonate.
What dishwasher salt setting should I use in Stamford CT?
For 51 mg/L (2.9 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Stamford CT?
No. With soft water a softener adds nothing.
Source
Source: Aquarion 2025 Water Quality Report (Stamford system) (2025). Method: figure published by the water supplier. Aquarion 2025 Water Quality Report (Stamford system) · Outdated figure? Tell us