Water hardness in Suwałki
300 mg/L very hard
Tap water in Suwałki is very hard: 300 mg/L (17.5 gpg · 16.8 °dH · 30 °fH).
Source: PWiK Suwałki – Twardość wody (2026) · data checked 2026-10-29
PWiK Suwałki publishes a hardness of 300 mg/L CaCO₃ for the city on its water page (2026), in the very hard category. A single figure is given, so we show no zone range. Expect limescale on taps and in kettles, and plan for periodic descaling of boilers and washing machines.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 300 mg/L |
|---|---|
| Utility | PWiK Suwałki |
How Suwałki compares
- Tap water in Suwałki is 22 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 16 of 91 in Poland (1 = hardest); 83 % of these cities have softer water.
Ranking of the hardest and softest water in Poland →
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 Suwałki
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 17 °dH |
| AEG / Electrolux | 4 |
| Beko | 5th |
| Hoover | S3 |
| 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 Suwałki water hard or soft?
It is very hard: 300 mg/L as CaCO₃ (17.5 gpg, 16.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Suwałki safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
How many grains per gallon is Suwałki water?
17.5 gpg, equal to 16.8 °dH, 30 °fH or 300 mg/L calcium carbonate.
What dishwasher salt setting should I use in Suwałki?
For 300 mg/L (16.8 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Suwałki?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: PWiK Suwałki – Twardość wody (2026). Method: figure published by the water supplier. PWiK Suwałki – Twardość wody · Outdated figure? Tell us