Water hardness in Zumarraga
9.7 °fH moderately hard
Tap water in Zumarraga is moderately hard: 9.7 °fH (97 mg/L · 5.7 gpg · 5.4 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 20080 (2024-09) · data checked 2026-10-19
Range across supply zones: 37–164 mg/L.
SINAC, the Ministry of Health's drinking-water register, reports 97 mg/L CaCO₃ for Zumarraga, moderately hard, with a wide range from 37 to 164 mg/L. The latest reading dates from September 2024. Urretxu, Legazpi and Gabiria nearby are softer, between 59.5 and 71 mg/L. Hardness depends on the supply serving your street.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 9.7 °fH |
|---|
How Zumarraga compares
- Tap water in Zumarraga is 52 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 3607 of 4988 in Spain (1 = hardest); 27 % of these cities have softer water.
- In Guipúzcoa it is number 64 of 86 cities; the regional median is 15.3 °fH.
- Nearest city with clearly softer water: Urretxu, 0 km away (7.1 °fH).
- Nearest city with clearly harder water: Antzuola, 5 km away (15 °fH).
Ranking of the hardest and softest water in Spain →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Zumarraga
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Zumarraga water hard or soft?
It is moderately hard: 97 mg/L as CaCO₃ (5.7 gpg, 5.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Zumarraga 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 Zumarraga water?
5.7 gpg, equal to 5.4 °dH, 9.7 °fH or 97 mg/L calcium carbonate.
What dishwasher salt setting should I use in Zumarraga?
For 97 mg/L (5.4 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Zumarraga?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 20080 (2024-09). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 20080 · Outdated figure? Tell us