Water hardness in Patras
155 mg/L hard
Tap water in Patras is hard: 155 mg/L (9.1 gpg · 8.7 °dH · 15.5 °fH).
Source: EDEYA labcheck – ΔΕΥΑ Πάτρας (2026) · data checked 2026-10-21
Range across supply zones: 150–199 mg/L.
Municipal water utilities (DEYA) in Greece usually combine boreholes in limestone aquifers with reservoirs and springs. The reported hardness is 155.0 mg/L CaCO₃, with measurements from 150.0 to 199.0 mg/L. Limescale is visible on kettles, taps and heaters, and a scale-reduction filter or softener can help protect appliances.
Greek utilities report total hardness in mg/L CaCO₃.
Water data
| Total hardness | 155 mg/L |
|---|---|
| Utility | ΔΕΥΑ Πάτρας |
How Patras compares
- Tap water in Patras is 35 % softer than the median of the 134 cities we track in Greece (237 mg/L).
- By hardness it ranks 99 of 134 in Greece (1 = hardest); 26 % of these cities have softer water.
- In West Greece it is number 10 of 11 cities; the regional median is 225 mg/L.
- Nearest city with clearly softer water: Agios Vasileios, 10 km away (113 mg/L).
- Nearest city with clearly harder water: Paralia, 6 km away (292 mg/L).
Ranking of the hardest and softest water in Greece →
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 Patras
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 9 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| 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 Patras water hard or soft?
It is hard: 155 mg/L as CaCO₃ (9.1 gpg, 8.7 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Patras 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 Patras water?
9.1 gpg, equal to 8.7 °dH, 15.5 °fH or 155 mg/L calcium carbonate.
What dishwasher salt setting should I use in Patras?
For 155 mg/L (8.7 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Patras?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: EDEYA labcheck – ΔΕΥΑ Πάτρας (2026). Method: figure published by the water supplier. EDEYA labcheck – ΔΕΥΑ Πάτρας · Outdated figure? Tell us