Water hardness in Grado
18.3 °fH very hard
Tap water in Grado is very hard: 18.3 °fH (183 mg/L · 10.7 gpg · 10.3 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 33026 (2026-09) · data checked 2026-10-19
Range across supply zones: 11–206 mg/L.
SINAC, the Ministry of Health's drinking-water register, reports 183 mg/L CaCO₃ for Grado, very hard, with a very wide range from 10.7 to 206 mg/L. Nearby councils run from 88.1 to 186 mg/L. Hardness depends on the village supply, so check the figure for your own address; scale builds up on kettles and heaters at the upper end.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 18.3 °fH |
|---|
How Grado compares
- Tap water in Grado is 9 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 2670 of 4988 in Spain (1 = hardest); 46 % of these cities have softer water.
- In Asturias it is number 5 of 49 cities; the regional median is 11.5 °fH.
- Nearest city with clearly softer water: Proaza, 10 km away (14.2 °fH).
- Nearest city with clearly harder water: Gozón, 40 km away (29.8 °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 Grado
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Grado water hard or soft?
It is very hard: 183 mg/L as CaCO₃ (10.7 gpg, 10.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Grado 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 Grado water?
10.7 gpg, equal to 10.3 °dH, 18.3 °fH or 183 mg/L calcium carbonate.
What dishwasher salt setting should I use in Grado?
For 183 mg/L (10.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Grado?
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 33026 (2026-09). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 33026 · Outdated figure? Tell us