Water hardness in Thessaloníki
245 mg/L very hard
Tap water in Thessaloníki is very hard: 245 mg/L (14.3 gpg · 13.7 °dH · 24.5 °fH).
Source: EYATH - Ποιότητα νερού, σύνολο αναλύσεων δικτύου πόλης 2025 (2025) · data checked 2026-10-29
Range across supply zones: 200–290 mg/L.
Thessaloníki is served by EYATH, and its 2025 network analyses give a median of 245 mg/L as CaCO₃, with results between 200 and 290 mg/L. That is very hard water. The spread reflects different sources and parts of the network, so a given street may sit above or below the median. Scale on heaters and taps is likely.
Greek utilities report total hardness in mg/L CaCO₃.
Water data
| Total hardness | 245 mg/L |
|---|---|
| Utility | EYATH |
How Thessaloníki compares
- Tap water in Thessaloníki is close to the median of the 134 cities we track in Greece (237 mg/L).
- By hardness it ranks 63 of 134 in Greece (1 = hardest); 52 % of these cities have softer water.
- In Central Macedonia it is number 34 of 47 cities; the regional median is 300 mg/L.
- Nearest city with clearly softer water: Mouries, 69 km away (46 mg/L).
- Nearest city with clearly harder water: Asvestochori, 8 km away (327 mg/L).
Ranking of the hardest and softest water in Greece →
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 Thessaloníki
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 14 °dH |
| AEG / Electrolux | 3 |
| Beko | 4th |
| 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 Thessaloníki water hard or soft?
It is very hard: 245 mg/L as CaCO₃ (14.3 gpg, 13.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Thessaloníki safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Greek utilities report total hardness in mg/L CaCO₃.
How many grains per gallon is Thessaloníki water?
14.3 gpg, equal to 13.7 °dH, 24.5 °fH or 245 mg/L calcium carbonate.
What dishwasher salt setting should I use in Thessaloníki?
For 245 mg/L (13.7 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Thessaloníki?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: EYATH - Ποιότητα νερού, σύνολο αναλύσεων δικτύου πόλης 2025 (2025). Method: computed from supplier's calcium and magnesium. EYATH - Ποιότητα νερού, σύνολο αναλύσεων δικτύου πόλης 2025 · Outdated figure? Tell us