Water hardness in Anjō
21 mg/L soft
Tap water in Anjō is soft: 21 mg/L (1.2 gpg · 1.2 °dH · 2.1 °fH).
Source: Anjo City Water and Sewerage Department, 水質検査結果 令和7年度 (annual) (2025) · data checked 2026-11-07
Range across supply zones: 19–41 mg/L.
Japanese waterworks report hardness (硬度) in mg/L CaCO₃; the standard is 300 mg/L and the target 10–100 mg/L.
Water data
| Total hardness | 21 mg/L |
|---|---|
| Utility | 安城市上下水道部 Anjo City Water and Sewerage Department |
How Anjō compares
- Tap water in Anjō is 58 % softer than the median of the 228 cities we track in Japan (50 mg/L).
- By hardness it ranks 215 of 228 in Japan (1 = hardest); 5 % of these cities have softer water.
- In Aichi it is number 4 of 8 cities; the regional median is 20 mg/L.
- Nearest city with clearly softer water: Toyota, 15 km away (11 mg/L).
- Nearest city with clearly harder water: Toyokawa, 33 km away (30 mg/L).
Ranking of the hardest and softest water in Japan →
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 Anjō
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °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 Anjō water hard or soft?
It is soft: 21 mg/L as CaCO₃ (1.2 gpg, 1.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Anjō safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Japanese waterworks report hardness (硬度) in mg/L CaCO₃; the standard is 300 mg/L and the target 10–100 mg/L.
How many grains per gallon is Anjō water?
1.2 gpg, equal to 1.2 °dH, 2.1 °fH or 21 mg/L calcium carbonate.
What dishwasher salt setting should I use in Anjō?
For 21 mg/L (1.2 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Anjō?
No. With soft water a softener adds nothing.
Source
Source: Anjo City Water and Sewerage Department, 水質検査結果 令和7年度 (annual) (2025). Method: figure published by the water supplier. Anjo City Water and Sewerage Department, 水質検査結果 令和7年度 (annual) · Outdated figure? Tell us