Water hardness in Ciechanów
338 mg/L very hard
Tap water in Ciechanów is very hard: 338 mg/L (19.7 gpg · 18.9 °dH · 33.8 °fH).
Source: ZWiK Ciechanów – Jakość wody (2026) · data checked 2026-10-29
Range across supply zones: 315–360 mg/L.
2 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| mg/L | mg/L | ||
|---|---|---|---|
| Wodociąg ul. Gostkowska | 315 | 315 | very hard |
| Wodociąg ul. Tysiąclecia | 360 | 360 | very hard |
ZWiK Ciechanów reports a median of 337.5 mg/L CaCO₃, and the two zones range from 315 to 360 mg/L. This is among the hardest water in this batch. Heavy scale in kettles, boilers and washing machines is likely. The utility's quality page does not describe the source of the water, so we do not name one.
Polish suppliers report total hardness in mg/L CaCO₃; the drinking-water regulation range is 60–500 mg/L.
Water data
| Total hardness | 338 mg/L |
|---|---|
| Utility | ZWiK Ciechanów |
How Ciechanów compares
- Tap water in Ciechanów is 38 % harder than the median of the 91 cities we track in Poland (245 mg/L).
- By hardness it ranks 9 of 91 in Poland (1 = hardest); 91 % of these cities have softer water.
- In mazowieckie it is number 1 of 17 cities; the regional median is 251 mg/L.
- Nearest city with clearly softer water: Nowy Dwór Mazowiecki, 51 km away (195 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 Ciechanów
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 19 °dH |
| AEG / Electrolux | 5 |
| 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 Ciechanów water hard or soft?
It is very hard: 338 mg/L as CaCO₃ (19.7 gpg, 18.9 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Ciechanów 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 Ciechanów water?
19.7 gpg, equal to 18.9 °dH, 33.8 °fH or 338 mg/L calcium carbonate.
What dishwasher salt setting should I use in Ciechanów?
For 338 mg/L (18.9 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Ciechanów?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: ZWiK Ciechanów – Jakość wody (2026). Method: figure published by the water supplier. ZWiK Ciechanów – Jakość wody · Outdated figure? Tell us