Water hardness in Seseña
26.5 °fH very hard
Tap water in Seseña is very hard: 26.5 °fH (265 mg/L · 15.5 gpg · 14.8 °dH).
Source: SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 45161 (2026-09) · data checked 2026-10-19
SINAC data from the Ministry of Health for September 2026 put Seseña at 265 mg/L CaCO₃. In this part of Castilla-La Mancha the water comes from aquifers in limestone and gypsum and, in some cases, from pipelines from distant reservoirs, hence very high hardness. This is hard water: it leaves white marks on fittings and appliances need descaling fairly often.
Fuentes españolas usan °fH (grados hidrotimétricos franceses) o mg/L CaCO₃.
Water data
| Total hardness | 26.5 °fH |
|---|
How Seseña compares
- Tap water in Seseña is 32 % harder than the median of the 4988 cities we track in Spain (20.1 °fH).
- By hardness it ranks 1814 of 4988 in Spain (1 = hardest); 63 % of these cities have softer water.
- In Toledo it is number 47 of 146 cities; the regional median is 7.7 °fH.
- Nearest city with clearly softer water: Aranjuez, 7 km away (4.4 °fH).
- Nearest city with clearly harder water: Ontígola, 14 km away (43.9 °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 Seseña
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 15 °dH |
| AEG / Electrolux | 4 |
| Beko | 4th |
| Hoover | S2 |
| LG | H3 |
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 Seseña water hard or soft?
It is very hard: 265 mg/L as CaCO₃ (15.5 gpg, 14.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Seseña 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 Seseña water?
15.5 gpg, equal to 14.8 °dH, 26.5 °fH or 265 mg/L calcium carbonate.
What dishwasher salt setting should I use in Seseña?
For 265 mg/L (14.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Seseña?
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 45161 (2026-09). Method: own measurement. SINAC, Ministerio de Sanidad — Información de un abastecimiento, municipio 45161 · Outdated figure? Tell us