Water hardness in San Agustín del Guadalix
3.3 °fH soft
Tap water in San Agustín del Guadalix is soft: 3.3 °fH (33 mg/L · 1.9 gpg · 1.8 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 28129 (2025-03) · data checked 2026-10-19
SINAC, the Ministry of Health's drinking-water register, reports 33 mg/L CaCO₃ for San Agustín del Guadalix, soft. Several nearby towns in the north of Madrid show the same 33.2 mg/L, which points to a shared supply. The reading in this record is from March 2025. Scale is minimal, and detergent can be dosed for soft water.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 3.3 °fH |
|---|
How San Agustín del Guadalix compares
- Tap water in San Agustín del Guadalix is 84 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 4421 of 4988 in Spain (1 = hardest); 11 % of these cities have softer water.
- In Madrid it is number 80 of 114 cities; the regional median is 3.8 °fH.
- Nearest city with clearly softer water: Venturada, 12 km away (2.5 °fH).
- Nearest city with clearly harder water: Colmenar Viejo, 10 km away (4.4 °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 San Agustín del Guadalix
| 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 San Agustín del Guadalix water hard or soft?
It is soft: 33 mg/L as CaCO₃ (1.9 gpg, 1.8 °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 Agustín del Guadalix 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 Agustín del Guadalix water?
1.9 gpg, equal to 1.8 °dH, 3.3 °fH or 33 mg/L calcium carbonate.
What dishwasher salt setting should I use in San Agustín del Guadalix?
For 33 mg/L (1.8 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in San Agustín del Guadalix?
No. With soft water a softener adds nothing.
Source
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 28129 (2025-03). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 28129 · Outdated figure? Tell us