Water hardness in Laguna de Duero
43.1 °fH very hard
Tap water in Laguna de Duero is very hard: 43.1 °fH (431 mg/L · 25.2 gpg · 24.1 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 47076 (2026-05) · data checked 2026-10-19
Range across supply zones: 281–581 mg/L.
SINAC data from the Ministry of Health for May 2026 put Laguna de Duero at 430.8 mg/L CaCO₃, with readings from 281 to 580.7 mg/L. Water in this part of Valladolid combines Duero intakes with wells in páramo terrain, which holds limestone and gypsum, hence high and variable hardness. With water this hard, scale shortens the life of heating elements and hot-water pipes and often justifies treatment at home.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 43.1 °fH |
|---|
How Laguna de Duero compares
- Tap water in Laguna de Duero is 114 % harder than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 498 of 4988 in Spain (1 = hardest); 90 % of these cities have softer water.
- In Valladolid it is number 11 of 137 cities; the regional median is 22.4 °fH.
- Nearest city with clearly softer water: Boecillo, 3 km away (26 °fH).
- Nearest city with clearly harder water: Gallegos de Hornija, 31 km away (66.3 °fH).
Ranking of the hardest and softest water in Spain →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Laguna de Duero
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 24 °dH |
| AEG / Electrolux | 6 |
| Beko | 6th |
| Hoover | S3 |
| LG | H4 |
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 Laguna de Duero water hard or soft?
It is very hard: 431 mg/L as CaCO₃ (25.2 gpg, 24.1 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Laguna de Duero 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 Laguna de Duero water?
25.2 gpg, equal to 24.1 °dH, 43.1 °fH or 431 mg/L calcium carbonate.
What dishwasher salt setting should I use in Laguna de Duero?
For 431 mg/L (24.1 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Laguna de Duero?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 47076 (2026-05). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 47076 · Outdated figure? Tell us