Tap water hardness in Lisboa
We have published hardness data for 13 cities in Lisboa. The median is 50 mg/L; the hardest water is in Alcabideche (289 mg/L), the softest in Paço de Arcos (42 mg/L).
8 % of these cities have hard or very hard water (over 120 mg/L).
Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
Cities in Lisboa, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Alcabideche | 289 | 289 | very hard |
| São Domingos de Rana | 108 | 108 | moderately hard |
| Cascais | 90 | 90 | moderately hard |
| Estoril | 90 | 90 | moderately hard |
| Alvalade | 80 | 80 | moderately hard |
| Massamá | 50 | 50 | soft |
| Sintra | 50 | 50 | soft |
| Alfornelos | 42 | 42 | soft |
| Amadora | 42 | 42 | soft |
| Carnaxide | 42 | 42 | soft |
| Damaia | 42 | 42 | soft |
| Oeiras | 42 | 42 | soft |
| Paço de Arcos | 42 | 42 | soft |