Water hardness in Rianxo
2.6 °fH soft
Tap water in Rianxo is soft: 2.6 °fH (26 mg/L · 1.5 gpg · 1.5 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 15072 (2026-08) · data checked 2026-10-19
Range across supply zones: 12–28 mg/L.
SINAC, the Ministry of Health's drinking-water register, reports 26 mg/L CaCO₃ for Rianxo, soft, with values between 12 and 28 mg/L. The Arousa estuary area sits largely on granite, and nearby councils are between 5 and 36 mg/L. Scale is hardly an issue; soft-water detergent doses are enough.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 2.6 °fH |
|---|
How Rianxo compares
- Tap water in Rianxo is 87 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 4555 of 4988 in Spain (1 = hardest); 8 % of these cities have softer water.
- In Coruña (A) it is number 31 of 85 cities; the regional median is 2.1 °fH.
- Nearest city with clearly softer water: Dodro, 9 km away (1.9 °fH).
- Nearest city with clearly harder water: Barro, 19 km away (3.6 °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 Rianxo
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 1 °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 Rianxo water hard or soft?
It is soft: 26 mg/L as CaCO₃ (1.5 gpg, 1.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rianxo 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 Rianxo water?
1.5 gpg, equal to 1.5 °dH, 2.6 °fH or 26 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rianxo?
For 26 mg/L (1.5 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Rianxo?
No. With soft water a softener adds nothing.
Source
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 15072 (2026-08). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 15072 · Outdated figure? Tell us