Water hardness in San Juan de Aznalfarache
12 °fH hard
Tap water in San Juan de Aznalfarache is hard: 12 °fH (120 mg/L · 7 gpg · 6.7 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 41086 (2026-09) · data checked 2026-10-19
For San Juan de Aznalfarache, SINAC (the Ministry of Health's water-supply system) records 120 mg/L CaCO₃ as of September 2026. The Seville metropolitan area is supplied mainly from reservoirs in the Sierra Norte and Huelva, such as Gergal, Cala and Aracena, operated by Emasesa; the ground is largely siliceous rock and the water tends to be soft. 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 | 12 °fH |
|---|
How San Juan de Aznalfarache compares
- Tap water in San Juan de Aznalfarache is 40 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 3382 of 4988 in Spain (1 = hardest); 32 % of these cities have softer water.
- In Sevilla it is number 44 of 103 cities; the regional median is 11.8 °fH.
- Nearest city with clearly softer water: Tomares, 1 km away (8.8 °fH).
- Nearest city with clearly harder water: Villaverde del Río, 29 km away (38.8 °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 San Juan de Aznalfarache
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °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 San Juan de Aznalfarache water hard or soft?
It is hard: 120 mg/L as CaCO₃ (7 gpg, 6.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in San Juan de Aznalfarache 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 San Juan de Aznalfarache water?
7 gpg, equal to 6.7 °dH, 12 °fH or 120 mg/L calcium carbonate.
What dishwasher salt setting should I use in San Juan de Aznalfarache?
For 120 mg/L (6.7 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in San Juan de Aznalfarache?
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 41086 (2026-09). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 41086 · Outdated figure? Tell us