Tap water hardness in Tocantins
We have published hardness data for 8 cities in Tocantins. The median is 39 mg/L; the hardest water is in Araguanã (215 mg/L), the softest in Crixás do Tocantins (6 mg/L).
13 % of these cities have hard or very hard water (over 120 mg/L).
Portaria GM/MS nº 888/2021 sets a maximum of 300 mg/L CaCO₃ for total hardness (dureza total); operators report it in mg/L to SISAGUA.
Cities in Tocantins, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Araguanã | 215 | 215 | very hard |
| Chapada de Areia | 67 | 67 | moderately hard |
| Bernardo Sayão | 58 | 58 | soft |
| Porto Nacional | 56 | 56 | soft |
| Babaçulândia | 22 | 22 | soft |
| Arapoema | 14 | 14 | soft |
| Cristalândia | 12 | 12 | soft |
| Crixás do Tocantins | 6 | 6 | soft |