Water hardness in Cartagena
17.9 °fH hard
Tap water in Cartagena is hard: 17.9 °fH (179 mg/L · 10.4 gpg · 10 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 30016 (2026-09) · data checked 2026-10-19
Range across supply zones: 118–233 mg/L.
It receives water from the Mancomunidad de los Canales del Taibilla, combining the Tajo-Segura transfer with desalination. Official analyses put the water at 178.5 mg/L CaCO₃, hard, with values between 118 and 233 mg/L. Contact with limestone terrain adds calcium and bicarbonate. Scale builds up quickly in kettles, taps and washing-machine heating elements.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 17.9 °fH |
|---|
How Cartagena compares
- Tap water in Cartagena is 11 % softer than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 2723 of 4988 in Spain (1 = hardest); 45 % of these cities have softer water.
- In Murcia it is number 41 of 45 cities; the regional median is 24.9 °fH.
- Nearest city with clearly softer water: Águilas, 58 km away (9.6 °fH).
- Nearest city with clearly harder water: Unión, La, 5 km away (23.1 °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 Cartagena
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 10 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S2 |
| LG | H2 |
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 Cartagena water hard or soft?
It is hard: 179 mg/L as CaCO₃ (10.4 gpg, 10 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Cartagena 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 Cartagena water?
10.4 gpg, equal to 10 °dH, 17.9 °fH or 179 mg/L calcium carbonate.
What dishwasher salt setting should I use in Cartagena?
For 179 mg/L (10 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Cartagena?
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 30016 (2026-09). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 30016 · Outdated figure? Tell us