Water hardness in Santiago de Compostela
3 °fH soft
Tap water in Santiago de Compostela is soft: 3 °fH (30 mg/L · 1.8 gpg · 1.7 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 15078 (2026-10) · data checked 2026-10-19
Range across supply zones: 21–51 mg/L.
The water comes from Galician rivers and reservoirs over a granite and schist bedrock. Official analyses put the water at 30 mg/L CaCO₃, soft, with values between 21 and 51 mg/L. Low-mineral, siliceous terrain explains the low calcium and magnesium. Appliances gather little scale; it is enough to dose detergent sensibly.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 3 °fH |
|---|
How Santiago de Compostela compares
- Tap water in Santiago de Compostela is 85 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 4471 of 4988 in Spain (1 = hardest); 10 % of these cities have softer water.
- In Coruña (A) it is number 19 of 85 cities; the regional median is 2.1 °fH.
- Nearest city with clearly softer water: Teo, 10 km away (2.3 °fH).
- Nearest city with clearly harder water: Vedra, 12 km away (6 °fH).
Ranking of the hardest and softest water in Spain →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Santiago de Compostela
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 2 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Santiago de Compostela water hard or soft?
It is soft: 30 mg/L as CaCO₃ (1.8 gpg, 1.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Santiago de Compostela 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 Santiago de Compostela water?
1.8 gpg, equal to 1.7 °dH, 3 °fH or 30 mg/L calcium carbonate.
What dishwasher salt setting should I use in Santiago de Compostela?
For 30 mg/L (1.7 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Santiago de Compostela?
No. With soft water a softener adds nothing.
Source
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 15078 (2026-10). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 15078 · Outdated figure? Tell us