Hardest and softest tap water in Brazil
All 1915 cities in Brazil with published data, ranked by total hardness. The national median is 43 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.
25 cities with the hardest water
| # | mg/L | mg/L | ||
|---|---|---|---|---|
| 1 | Ararendá · Ceará | 710 | 710 | very hard |
| 2 | Ruy Barbosa · Bahia | 401 | 401 | very hard |
| 3 | Monjolos · Minas Gerais | 367 | 367 | very hard |
| 4 | Salitre · Ceará | 365 | 365 | very hard |
| 5 | Monsenhor Tabosa · Ceará | 365 | 365 | very hard |
| 6 | Ipaumirim · Ceará | 320 | 320 | very hard |
| 7 | Ivaí · Paraná | 300 | 300 | very hard |
| 8 | Paulistas · Minas Gerais | 300 | 300 | very hard |
| 9 | Santo Amaro das Brotas · Sergipe | 297 | 297 | very hard |
| 10 | Timbó Grande · Santa Catarina | 292 | 292 | very hard |
| 11 | Porteiras · Ceará | 284 | 284 | very hard |
| 12 | Presidente Juscelino · Minas Gerais | 258 | 258 | very hard |
| 13 | Abaiara · Ceará | 254 | 254 | very hard |
| 14 | Santo Hipólito · Minas Gerais | 245 | 245 | very hard |
| 15 | Jati · Ceará | 244 | 244 | very hard |
| 16 | Maraú · Bahia | 238 | 238 | very hard |
| 17 | Mairinque · São Paulo | 234 | 234 | very hard |
| 18 | Arcos · Minas Gerais | 231 | 231 | very hard |
| 19 | Nova Olinda · Ceará | 230 | 230 | very hard |
| 20 | Caravelas · Bahia | 223 | 223 | very hard |
| 21 | Laranjeiras · Sergipe | 222 | 222 | very hard |
| 22 | Maruim · Sergipe | 220 | 220 | very hard |
| 23 | Salgado · Sergipe | 219 | 219 | very hard |
| 24 | Araguanã · Tocantins | 215 | 215 | very hard |
| 25 | Wagner · Bahia | 214 | 214 | very hard |
25 cities with the softest water
| # | mg/L | mg/L | ||
|---|---|---|---|---|
| 1 | Teodoro Sampaio · São Paulo | 5 | 5 | soft |
| 2 | São Sebastião · São Paulo | 5 | 5 | soft |
| 3 | Mongaguá · São Paulo | 5 | 5 | soft |
| 4 | Guatambú · Santa Catarina | 5 | 5 | soft |
| 5 | Datas · Minas Gerais | 5 | 5 | soft |
| 6 | Coroados · São Paulo | 5 | 5 | soft |
| 7 | Bertioga · São Paulo | 5 | 5 | soft |
| 8 | Nova Friburgo · Rio de Janeiro | 5 | 5 | soft |
| 9 | Sumidouro · Rio de Janeiro | 6 | 6 | soft |
| 10 | Serro · Minas Gerais | 6 | 6 | soft |
| 11 | Glicério · São Paulo | 6 | 6 | soft |
| 12 | Flexeiras · Alagoas | 6 | 6 | soft |
| 13 | São Francisco do Sul · Santa Catarina | 6 | 6 | soft |
| 14 | Rio Piracicaba · Minas Gerais | 6 | 6 | soft |
| 15 | Guaiçara · São Paulo | 6 | 6 | soft |
| 16 | Queimados · Rio de Janeiro | 6 | 6 | soft |
| 17 | Nova Trento · Santa Catarina | 6 | 6 | soft |
| 18 | Monteiro Lobato · São Paulo | 6 | 6 | soft |
| 19 | Carlinda · Mato Grosso | 6 | 6 | soft |
| 20 | Patrocínio do Muriaé · Minas Gerais | 6 | 6 | soft |
| 21 | Oriximiná · Pará | 6 | 6 | soft |
| 22 | Macieira · Santa Catarina | 6 | 6 | soft |
| 23 | Crixás do Tocantins · Tocantins | 6 | 6 | soft |
| 24 | Arandu · São Paulo | 6 | 6 | soft |
| 25 | Águas da Prata · São Paulo | 6 | 6 | soft |