Water hardness in Nules
49.1 °fH very hard
Tap water in Nules is very hard: 49.1 °fH (491 mg/L · 28.7 gpg · 27.5 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 12082 (2026-05) · data checked 2026-10-19
Range across supply zones: 474–508 mg/L.
SINAC, the Ministry of Health's drinking-water register, reports 491 mg/L CaCO₃ for Nules, very hard, with values between 474 and 508 mg/L. Castellón's coastal plain sits on limestone-rich sediments, and nearby towns in the dataset range from 304 to 504 mg/L. Scale forms quickly in kettles and heaters, so many homes use a softener.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 49.1 °fH |
|---|
How Nules compares
- Tap water in Nules is 144 % harder than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 276 of 4988 in Spain (1 = hardest); 94 % of these cities have softer water.
- In Castellón/Castelló it is number 26 of 134 cities; the regional median is 33.6 °fH.
- Nearest city with clearly softer water: Moncofa, 7 km away (32.6 °fH).
- Nearest city with clearly harder water: Sagunto/Sagunt, 19 km away (71.3 °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 Nules
| Brand | Setting for this water |
|---|---|
| Bosch | H06 |
| Miele | 28 °dH |
| AEG / Electrolux | 6 |
| Beko | 6th |
| Hoover | S4 |
| 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 Nules water hard or soft?
It is very hard: 491 mg/L as CaCO₃ (28.7 gpg, 27.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Nules 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 Nules water?
28.7 gpg, equal to 27.5 °dH, 49.1 °fH or 491 mg/L calcium carbonate.
What dishwasher salt setting should I use in Nules?
For 491 mg/L (27.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Nules?
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 12082 (2026-05). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 12082 · Outdated figure? Tell us