Water hardness in Vilnius
2.56 mmol/L very hard
Tap water in Vilnius is very hard: 2.56 mmol/L (257 mg/L · 15 gpg · 14.4 °dH).
Source: UAB Vilniaus vandenys - Vandenviečių vandens kietumo nustatymas 2025 (2025) · data checked 2026-10-23
Range across supply zones: 173–372 mg/L.
22 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mmol/L | mg/L | ||
|---|---|---|---|
| Antavilių | 2.68 | 269 | very hard |
| Aukštųjų Panerių | 3.16 | 316 | very hard |
| Bukčiai | 2.93 | 293 | very hard |
| Grigiškių | 3.7 | 370 | very hard |
| Gulbinų | 2.8 | 281 | very hard |
| Gėlos | 2.01 | 201 | very hard |
| Kabiškių | 3.71 | 372 | very hard |
| Kalnėnų | 2.46 | 247 | very hard |
| Karveliškių | 1.92 | 192 | very hard |
| Kreivalaužių | 1.72 | 173 | hard |
| Naujosios Vilnios | 2.44 | 244 | very hard |
| Naujųjų Verkių | 2.53 | 253 | very hard |
| Pagiriai (Kirtimai) | 2.41 | 241 | very hard |
| Pečiukų | 2.59 | 260 | very hard |
| Pučkorių | 2.38 | 239 | very hard |
| Salininkai | 2.99 | 299 | very hard |
| Sereikiškių | 2.29 | 230 | very hard |
| Tuputiškių | 2.39 | 239 | very hard |
| Turniškių | 2.85 | 285 | very hard |
| Verkių | 2.6 | 260 | very hard |
| Vingio parko rezervuaro | 3.5 | 350 | very hard |
| Žemieji Paneriai, rezervuaras | 2.37 | 237 | very hard |
Vilnius is supplied from groundwater: 32 intakes with 301 deep wells, 40 to 180 m deep. The figure shown, 256.5 mg/L CaCO₃, is the median across 22 supply zones, which range from 172.6 to 371.8 mg/L, so it depends on which zone your street is in. Scale forms fast on heaters and fittings; a water softener is a common remedy.
Lithuanian suppliers report total hardness in mmol/L.
Water data
| Total hardness | 2.56 mmol/L |
|---|---|
| Utility | UAB Vilniaus vandenys (vilniausvandenys.lt) |
How Vilnius compares
- Tap water in Vilnius is 9 % softer than the median of the 15 cities we track in Lithuania (2.83 mmol/L).
- By hardness it ranks 11 of 15 in Lithuania (1 = hardest); 29 % of these cities have softer water.
- Nearest city with clearly softer water: Varena, 70 km away (1.95 mmol/L).
- Nearest city with clearly harder water: Ukmerge, 71 km away (3.62 mmol/L).
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 Vilnius
| Brand | Setting for this water |
|---|---|
| Bosch | H04 |
| Miele | 14 °dH |
| AEG / Electrolux | 3 |
| 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 Vilnius water hard or soft?
It is very hard: 257 mg/L as CaCO₃ (15 gpg, 14.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Vilnius safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Lithuanian suppliers report total hardness in mmol/L.
How many grains per gallon is Vilnius water?
15 gpg, equal to 14.4 °dH, 25.6 °fH or 257 mg/L calcium carbonate.
What dishwasher salt setting should I use in Vilnius?
For 257 mg/L (14.4 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Vilnius?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: UAB Vilniaus vandenys - Vandenviečių vandens kietumo nustatymas 2025 (2025). Method: figure published by the water supplier. UAB Vilniaus vandenys - Vandenviečių vandens kietumo nustatymas 2025 · Outdated figure? Tell us