Water hardness in Guadalupe
292 mg/L very hard
Tap water in Guadalupe is very hard: 292 mg/L (17.1 gpg · 16.4 °dH · 29.2 °fH).
Source: SADM - Calidad del agua suministrada a traves de la red, julio 2023 a junio 2024 (2024) · data checked 2026-10-23
Monterrey's metropolitan water comes from the Cerro Prieto, El Cuchillo and La Boca dams plus the Mina wells, distributed by SADM. The reported hardness is 292.4 mg/L CaCO₃. Scale forms fast on heaters and fittings; a water softener is a common remedy.
Mexico's NOM-127-SSA1-2021 sets a 500 mg/L CaCO₃ limit for total hardness in drinking water.
Water data
| Total hardness | 292 mg/L |
|---|---|
| Utility | SADM |
How Guadalupe compares
- Tap water in Guadalupe is close to the median of the 9 cities we track in Mexico (292 mg/L).
- By hardness it ranks 1 of 9 in Mexico (1 = hardest); 25 % of these cities have softer water.
- In Nuevo Leon it is number 1 of 7 cities; the regional median is 292 mg/L.
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Guadalupe
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 16 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S2 |
| LG | H3 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Guadalupe water hard or soft?
It is very hard: 292 mg/L as CaCO₃ (17.1 gpg, 16.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Guadalupe safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Mexico's NOM-127-SSA1-2021 sets a 500 mg/L CaCO₃ limit for total hardness in drinking water.
How many grains per gallon is Guadalupe water?
17.1 gpg, equal to 16.4 °dH, 29.2 °fH or 292 mg/L calcium carbonate.
What dishwasher salt setting should I use in Guadalupe?
For 292 mg/L (16.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Guadalupe?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: SADM - Calidad del agua suministrada a traves de la red, julio 2023 a junio 2024 (2024). Method: figure published by the water supplier. SADM - Calidad del agua suministrada a traves de la red, julio 2023 a junio 2024 · Outdated figure? Tell us