Water hardness in Hongcheon
52 mg/L soft
Tap water in Hongcheon is soft: 52 mg/L (3 gpg · 2.9 °dH · 5.2 °fH).
Source: K-water / 강원특별자치도 홍천군 via data.go.kr (2025) · data checked 2026-10-20
Range across supply zones: 27–97 mg/L.
The municipal treatment plants serving Hongcheon had a 2025 median hardness of 52.0 mg/L CaCO₃, with plants ranging from 27.0 to 96.5 mg/L. Most of Gangwon's supply comes from mountain streams and dams in the upper Han basin, such as Soyanggang; this utility's own source is not confirmed here. Soft water leaves little limescale on taps and appliances; detergent doses can usually stay at the low end of the label. The spread between plants is wide, so check which plant serves your street.
Korean waterworks report hardness (경도) in mg/L CaCO₃; the drinking-water standard is 300 mg/L (1,000 mg/L for some sources).
Water data
| Total hardness | 52 mg/L |
|---|---|
| Utility | Hongcheon-gun (강원특별자치도 홍천군) |
How Hongcheon compares
- Tap water in Hongcheon is 8 % softer than the median of the 127 cities we track in South Korea (57 mg/L).
- By hardness it ranks 72 of 127 in South Korea (1 = hardest); 43 % of these cities have softer water.
- In Gangwon-do it is number 8 of 17 cities; the regional median is 47 mg/L.
- Nearest city with clearly softer water: Chuncheon, 29 km away (34 mg/L).
- Nearest city with clearly harder water: Wonju, 50 km away (110 mg/L).
Ranking of the hardest and softest water in South Korea →
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 Hongcheon
| 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 Hongcheon water hard or soft?
It is soft: 52 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 Hongcheon safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Korean waterworks report hardness (경도) in mg/L CaCO₃; the drinking-water standard is 300 mg/L (1,000 mg/L for some sources).
How many grains per gallon is Hongcheon water?
3 gpg, equal to 2.9 °dH, 5.2 °fH or 52 mg/L calcium carbonate.
What dishwasher salt setting should I use in Hongcheon?
For 52 mg/L (2.9 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Hongcheon?
No. With soft water a softener adds nothing.
Source
Source: K-water / 강원특별자치도 홍천군 via data.go.kr (2025). Method: figure published by the water supplier. K-water / 강원특별자치도 홍천군 via data.go.kr · Outdated figure? Tell us