Water hardness in Llanera
13.6 °fH hard
Tap water in Llanera is hard: 13.6 °fH (136 mg/L · 7.9 gpg · 7.6 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 33035 (2026-03) · data checked 2026-10-19
Range across supply zones: 81–271 mg/L.
The hardness recorded in SINAC for Llanera is 136 mg/L CaCO₃, with readings from 81 to 271 mg/L, based on March 2026 data, so it varies a lot with the supply point and the blend at the time. In Asturias water is taken from rivers and reservoirs in the Cantabrian mountains; limestone and slate alternate in the central area, so hardness differs between municipalities. Limescale starts to show on glass and coffee machines, though the effect at home is moderate.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 13.6 °fH |
|---|
How Llanera compares
- Tap water in Llanera is 32 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 3196 of 4988 in Spain (1 = hardest); 36 % of these cities have softer water.
- In Asturias it is number 15 of 49 cities; the regional median is 11.5 °fH.
- Nearest city with clearly softer water: Corvera de Asturias, 8 km away (8.7 °fH).
- Nearest city with clearly harder water: Oviedo, 10 km away (18.1 °fH).
Ranking of the hardest and softest water in Spain →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Llanera
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| 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 Llanera water hard or soft?
It is hard: 136 mg/L as CaCO₃ (7.9 gpg, 7.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Llanera 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 Llanera water?
7.9 gpg, equal to 7.6 °dH, 13.6 °fH or 136 mg/L calcium carbonate.
What dishwasher salt setting should I use in Llanera?
For 136 mg/L (7.6 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Llanera?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 33035 (2026-03). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 33035 · Outdated figure? Tell us