Water hardness in Rosario, El
10.9 °fH moderately hard
Tap water in Rosario, El is moderately hard: 10.9 °fH (109 mg/L · 6.4 gpg · 6.1 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 38032 (2026-06) · data checked 2026-10-19
Range across supply zones: 83–191 mg/L.
SINAC data from the Ministry of Health for June 2026 put El Rosario at 109 mg/L CaCO₃, with readings from 83 to 191 mg/L, so it varies a lot with the supply point and the blend at the time. In the western Canary Islands water comes mostly from galleries and wells in volcanic rock, with desalination in some areas; hardness changes with the blend. Scale builds up slowly; descaling the kettle and coffee machine now and then is usually enough.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 10.9 °fH |
|---|
How Rosario, El compares
- Tap water in Rosario, El is 46 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 3502 of 4988 in Spain (1 = hardest); 30 % of these cities have softer water.
- In Santa Cruz de Tenerife it is number 23 of 48 cities; the regional median is 10 °fH.
- Nearest city with clearly softer water: Arafo, 13 km away (6.3 °fH).
- Nearest city with clearly harder water: Sauzal, El, 7 km away (18 °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 Rosario, El
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °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 Rosario, El water hard or soft?
It is moderately hard: 109 mg/L as CaCO₃ (6.4 gpg, 6.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Rosario, El 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 Rosario, El water?
6.4 gpg, equal to 6.1 °dH, 10.9 °fH or 109 mg/L calcium carbonate.
What dishwasher salt setting should I use in Rosario, El?
For 109 mg/L (6.1 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Rosario, El?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 38032 (2026-06). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 38032 · Outdated figure? Tell us