Water hardness in Calatayud
34.8 °fH very hard
Tap water in Calatayud is very hard: 34.8 °fH (348 mg/L · 20.3 gpg · 19.5 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 50067 (2026-09) · data checked 2026-10-19
Range across supply zones: 200–461 mg/L.
The hardness recorded in SINAC for Calatayud is 347.5 mg/L CaCO₃, with readings from 200 to 461 mg/L, based on September 2026 data, so it varies a lot with the supply point and the blend at the time. In this part of Aragón the water comes from the Ebro, its tributaries and local sources, and crosses ground with gypsum and limestone that raises mineral content. This hardness forms limescale quickly in kettles, water heaters and washing machines; in a home, a softener is usually worth considering.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 34.8 °fH |
|---|
How Calatayud compares
- Tap water in Calatayud is 73 % harder than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 1004 of 4988 in Spain (1 = hardest); 80 % of these cities have softer water.
- In Zaragoza it is number 85 of 269 cities; the regional median is 27 °fH.
- Nearest city with clearly softer water: Torralba de Ribota, 6 km away (13.7 °fH).
- Nearest city with clearly harder water: Paracuellos de la Ribera, 7 km away (48.1 °fH).
Ranking of the hardest and softest water in Spain →
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 Calatayud
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 5 |
| Beko | 5th |
| Hoover | S3 |
| 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 Calatayud water hard or soft?
It is very hard: 348 mg/L as CaCO₃ (20.3 gpg, 19.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Calatayud safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
How many grains per gallon is Calatayud water?
20.3 gpg, equal to 19.5 °dH, 34.8 °fH or 348 mg/L calcium carbonate.
What dishwasher salt setting should I use in Calatayud?
For 348 mg/L (19.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Calatayud?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 50067 (2026-09). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 50067 · Outdated figure? Tell us