Water hardness in Constanța
18.2 °dH very hard
Tap water in Constanța is very hard: 18.2 °dH (325 mg/L · 19 gpg · 32.5 °fH).
Source: RAJA Constanța: Indicatori fizico-chimici, valori medii 2026 (2026) · data checked 2026-10-23
Range across supply zones: 270–337 mg/L.
4 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| Constanța, ZAP I | 15.1 | 270 | very hard |
| Constanța, ZAP II | 17.9 | 320 | very hard |
| Constanța, ZAP III | 18.5 | 330 | very hard |
| Constanța, ZAP IV | 18.9 | 337 | very hard |
Public supply in Romania combines surface water and groundwater, and hardness follows the local geology. The figure shown, 324.9 mg/L CaCO₃, is the median across 4 supply zones, which range from 269.5 to 337.4 mg/L, so it depends on which zone your street is in. Appliances scale up quickly at this level, and a softener is worth considering.
Romanian operators report "duritate totală" in German degrees (grade germane); the minimum is 5 °dH.
Water data
| Total hardness | 18.2 °dH |
|---|---|
| Calcium (mg/L) | 82.8 |
| Magnesium (mg/L) | 31.6 |
| Utility | RAJA S.A. Constanța |
How Constanța compares
- Tap water in Constanța is 12 % harder than the median of the 115 cities we track in Romania (16.3 °dH).
- By hardness it ranks 34 of 115 in Romania (1 = hardest); 70 % of these cities have softer water.
- In Constanța it is number 2 of 4 cities; the regional median is 18.2 °dH.
- Nearest city with clearly softer water: Nisipari, 21 km away (12.5 °dH).
- Nearest city with clearly harder water: Murfatlar, 17 km away (23 °dH).
Ranking of the hardest and softest water in Romania →
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 Constanța
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 18 °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 Constanța water hard or soft?
It is very hard: 325 mg/L as CaCO₃ (19 gpg, 18.2 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Constanța safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Romanian operators report "duritate totală" in German degrees (grade germane); the minimum is 5 °dH.
How many grains per gallon is Constanța water?
19 gpg, equal to 18.2 °dH, 32.5 °fH or 325 mg/L calcium carbonate.
What dishwasher salt setting should I use in Constanța?
For 325 mg/L (18.2 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Constanța?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: RAJA Constanța: Indicatori fizico-chimici, valori medii 2026 (2026). Method: figure published by the water supplier. RAJA Constanța: Indicatori fizico-chimici, valori medii 2026 · Outdated figure? Tell us