Water hardness in Płock
256 mg/L very hard
Tap water in Płock is very hard: 256 mg/L (14.9 gpg · 14.3 °dH · 25.6 °fH).
Source: Wodociągi Płockie: Jakość wody, results of 22 October 2026 (2026-10) · data checked 2026-10-23
Range across supply zones: 236–275 mg/L.
Public supply in this part of Poland draws largely on groundwater from limestone- and carbonate-bearing glacial and older deposits, which tends to give hard water. The reported hardness is 255.5 mg/L CaCO₃, with measurements from 236.0 to 275.0 mg/L. Appliances scale up quickly at this level, and a softener is worth considering.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 256 mg/L |
|---|---|
| Utility | Wodociągi Płockie Sp. z o.o. |
How Płock compares
- Tap water in Płock is close to the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 41 of 91 in Poland (1 = hardest); 56 % of these cities have softer water.
- In mazowieckie it is number 6 of 17 cities; the regional median is 251 mg/L.
- Nearest city with clearly softer water: Nowy Dwór Mazowiecki, 70 km away (195 mg/L).
- Nearest city with clearly harder water: Ciechanów, 72 km away (338 mg/L).
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 Płock
| 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 Płock water hard or soft?
It is very hard: 256 mg/L as CaCO₃ (14.9 gpg, 14.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Płock 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 Płock water?
14.9 gpg, equal to 14.3 °dH, 25.6 °fH or 256 mg/L calcium carbonate.
What dishwasher salt setting should I use in Płock?
For 256 mg/L (14.3 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Płock?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Wodociągi Płockie: Jakość wody, results of 22 October 2026 (2026-10). Method: computed from supplier's calcium and magnesium. Wodociągi Płockie: Jakość wody, results of 22 October 2026 · Outdated figure? Tell us