Water hardness in Mexico
9 cities with published hardness data, sorted by population. Median: 292 mg/L.
Median
292 mg/L
very hard
Mexico's NOM-127-SSA1-2021 sets a 500 mg/L CaCO₃ limit for total hardness in drinking water.
Largest places, hardest first
| mg/L | mg/L | ||
|---|---|---|---|
| Ciudad General Escobedo · Nuevo León | 292 | 292 | very hard |
| San Nicolás de los Garza · Nuevo León | 292 | 292 | very hard |
| Ciudad Benito Juárez · Nuevo León | 292 | 292 | very hard |
| Santa Catarina · Nuevo León | 292 | 292 | very hard |
| Guadalupe · Nuevo Leon | 292 | 292 | very hard |
| Monterrey · Nuevo Leon | 292 | 292 | very hard |
| Hermosillo · Sonora | 204 | 204 | very hard |
| Ciudad Apodaca · Nuevo Leon | 292 | 292 | very hard |
| Acapulco de Juarez · Guerrero | 196 | 196 | very hard |