Water hardness in South Korea
127 cities with published hardness data, sorted by population. Median: 57 mg/L.
Median
57 mg/L
soft
- 68 soft
- 55 moderately hard
- 4 hard
Korean waterworks report hardness (경도) in mg/L CaCO₃; the drinking-water standard is 300 mg/L (1,000 mg/L for some sources).
Ranking of the hardest and softest water in South Korea →
Regions
- Chungcheongnam-do5 · 75 mg/L
- Gangwon-do17 · 47 mg/L
- Gyeonggi-do25 · 68 mg/L
- Gyeongsangbuk-do20 · 66 mg/L
- Gyeongsangnam-do17 · 43 mg/L
- Jeollabuk-do7 · 45 mg/L
- Jeollanam-do19 · 35 mg/L
- North Chungcheong9 · 92 mg/L
Largest places, hardest first
Every place is listed on its region page.
| mg/L | mg/L | ||
|---|---|---|---|
| Donghae · Gangwon-do | 149 | 149 | hard |
| Pyeongtaek · Gyeonggi-do | 133 | 133 | hard |
| Cheonan · Chungcheongnam-do | 124 | 124 | hard |
| Uiseong · Gyeongsangbuk-do | 113 | 113 | moderately hard |
| Jincheon · North Chungcheong | 112 | 112 | moderately hard |
| Wonju · Gangwon-do | 110 | 110 | moderately hard |
| Icheon · Gyeonggi-do | 108 | 108 | moderately hard |
| Jeongseon · Gangwon-do | 107 | 107 | moderately hard |
| Seongju · Gyeongsangbuk-do | 103 | 103 | moderately hard |
| Changwon · Gyeongsangnam-do | 100 | 100 | moderately hard |
| Yeoju · Gyeonggi-do | 92 | 92 | moderately hard |
| Jecheon · North Chungcheong | 92 | 92 | moderately hard |
| Gimhae · Gyeongsangnam-do | 90 | 90 | moderately hard |
| Pohang · Gyeongsangbuk-do | 88 | 88 | moderately hard |
| Haman · Gyeongsangnam-do | 85 | 85 | moderately hard |
| Chungju · North Chungcheong | 84 | 84 | moderately hard |
| Yecheon · Gyeongsangbuk-do | 82 | 82 | moderately hard |
| Gyeongsan · Gyeongsangbuk-do | 82 | 82 | moderately hard |
| Gwacheon · Gyeonggi-do | 80 | 80 | moderately hard |
| Gumi · Gyeongsangbuk-do | 78 | 78 | moderately hard |
| Yangsan · Gyeongsangnam-do | 78 | 78 | moderately hard |
| Andong · Gyeongsangbuk-do | 76 | 76 | moderately hard |
| Guri · Gyeonggi-do | 75 | 75 | moderately hard |
| Boryeong · Chungcheongnam-do | 75 | 75 | moderately hard |
| Daegu · Daegu | 75 | 75 | moderately hard |
| Ulsan · Ulsan | 74 | 74 | moderately hard |
| Ansan · Gyeonggi-do | 74 | 74 | moderately hard |
| Anyang · Gyeonggi-do | 74 | 74 | moderately hard |
| Sangju · Gyeongsangbuk-do | 74 | 74 | moderately hard |
| Seoul · Seoul | 73 | 73 | moderately hard |
| Uiwang · Gyeonggi-do | 72 | 72 | moderately hard |
| Yongin · Gyeonggi-do | 72 | 72 | moderately hard |
| Yeongdeok · Gyeongsangbuk-do | 72 | 72 | moderately hard |
| Hanam · Gyeonggi-do | 71 | 71 | moderately hard |
| Suwon · Gyeonggi-do | 70 | 70 | moderately hard |
| Incheon · Incheon | 69 | 69 | moderately hard |
| Seongnam · Gyeonggi-do | 69 | 69 | moderately hard |
| Gunpo · Gyeonggi-do | 68 | 68 | moderately hard |
| Gwangju · Gyeonggi-do | 68 | 68 | moderately hard |
| Busan · Busan | 67 | 67 | moderately hard |
| Bucheon · Gyeonggi-do | 67 | 67 | moderately hard |
| Cheongju · North Chungcheong | 67 | 67 | moderately hard |
| Gongju · Chungcheongnam-do | 66 | 66 | moderately hard |
| Gimpo · Gyeonggi-do | 66 | 66 | moderately hard |
| Miryang · Gyeongsangnam-do | 65 | 65 | moderately hard |
| Paju · Gyeonggi-do | 63 | 63 | moderately hard |
| Gwangmyeong · Gyeonggi-do | 63 | 63 | moderately hard |
| Pocheon · Gyeonggi-do | 62 | 62 | moderately hard |
| Cheorwon · Gangwon-do | 62 | 62 | moderately hard |
| Uljin · Gyeongsangbuk-do | 61 | 61 | moderately hard |
| Yeongcheon · Gyeongsangbuk-do | 60 | 60 | moderately hard |
| Namwon · Jeollabuk-do | 58 | 58 | soft |
| Yeongju · Gyeongsangbuk-do | 57 | 57 | soft |
| Gimcheon · Gyeongsangbuk-do | 57 | 57 | soft |
| Namyangju · Gyeonggi-do | 57 | 57 | soft |
| Gyeongju · Gyeongsangbuk-do | 57 | 57 | soft |
| Goseong · Gangwon-do | 56 | 56 | soft |
| Tongyeong · Gyeongsangnam-do | 55 | 55 | soft |
| Daejeon · Daejeon | 53 | 53 | soft |
| Mungyeong · Gyeongsangbuk-do | 52 | 52 | soft |
| Yangpyeong · Gyeonggi-do | 52 | 52 | soft |
| Hongcheon · Gangwon-do | 52 | 52 | soft |
| Hwasun · Jeollanam-do | 52 | 52 | soft |
| Boseong · Jeollanam-do | 52 | 52 | soft |
| Okcheon · North Chungcheong | 52 | 52 | soft |
| Yesan · Chungcheongnam-do | 51 | 51 | soft |
| Samcheok · Gangwon-do | 46 | 46 | soft |
| Yeoncheon · Gyeonggi-do | 45 | 45 | soft |
| Iksan · Jeollabuk-do | 45 | 45 | soft |
| Dongducheon · Gyeonggi-do | 45 | 45 | soft |
| Jinju · Gyeongsangnam-do | 44 | 44 | soft |
| Gapyeong · Gyeonggi-do | 44 | 44 | soft |
| Hapcheon · Gyeongsangnam-do | 43 | 43 | soft |
| Geochang · Gyeongsangnam-do | 42 | 42 | soft |
| Gangneung · Gangwon-do | 42 | 42 | soft |
| Gwangyang · Jeollanam-do | 41 | 41 | soft |
| Hampyeong · Jeollanam-do | 41 | 41 | soft |
| Haenam · Jeollanam-do | 40 | 40 | soft |
| Sacheon · Gyeongsangnam-do | 38 | 38 | soft |
| Hadong · Gyeongsangnam-do | 37 | 37 | soft |
| Sinan · Jeollanam-do | 37 | 37 | soft |
| Yeonggwang · Jeollanam-do | 36 | 36 | soft |
| Suncheon · Jeollanam-do | 35 | 35 | soft |
| Gangjin · Jeollanam-do | 35 | 35 | soft |
| Chuncheon · Gangwon-do | 34 | 34 | soft |
| Yeosu · Jeollanam-do | 33 | 33 | soft |
| Namhae · Gyeongsangnam-do | 32 | 32 | soft |
| Jeju · Jeju-do | 31 | 31 | soft |
| Uijeongbu · Gyeonggi-do | 30 | 30 | soft |
| Mokpo · Jeollanam-do | 29 | 29 | soft |
| Changnyeong · Gyeongsangnam-do | 28 | 28 | soft |
| Geoje · Gyeongsangnam-do | 28 | 28 | soft |
| Damyang · Jeollanam-do | 28 | 28 | soft |
| Gwangju · Gwangju | 26 | 26 | soft |
| Jangseong · Jeollanam-do | 25 | 25 | soft |
| Yeongam · Jeollanam-do | 23 | 23 | soft |
| Buan · Jeollabuk-do | 22 | 22 | soft |
| Goheung · Jeollanam-do | 21 | 21 | soft |
| Wando · Jeollanam-do | 16 | 16 | soft |
| Sokcho · Gangwon-do | 9 | 9 | soft |