Water hardness in Narva
1.5 mmol/L hard
Tap water in Narva is hard: 1.5 mmol/L (150 mg/L · 8.8 gpg · 8.4 °dH).
Source: Terviseamet, veevärkide veeproovid (avalikud andmed) 2021–2025 (2025-02) · data checked 2026-10-19
Range across supply zones: 134–150 mg/L.
Estonia relies largely on groundwater from limestone and dolomite aquifers in the north and sandstone further south, which gives hard water. The reported hardness is 150.0 mg/L CaCO₃, with measurements from 134.4 to 150.3 mg/L. Limescale is visible on kettles, taps and heaters, and a scale-reduction filter or softener can help protect appliances.
Estonian laboratories report total hardness (üldkaredus) in mmol/L or mg-eq/L (1 mmol/L = 2 mg-eq/L = 100 mg/L CaCO₃); groundwater supplies are mostly hard.
Water data
| Total hardness | 1.5 mmol/L |
|---|
How Narva compares
- Tap water in Narva is 36 % softer than the median of the 28 cities we track in Estonia (2.32 mmol/L).
- By hardness it ranks 24 of 28 in Estonia (1 = hardest); 15 % of these cities have softer water.
- Nearest city with clearly softer water: Narva-Jõesuu, 12 km away (0.34 mmol/L).
- Nearest city with clearly harder water: Rakvere, 104 km away (2.05 mmol/L).
Ranking of the hardest and softest water in Estonia →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Narva
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| LG | H2 |
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 Narva water hard or soft?
It is hard: 150 mg/L as CaCO₃ (8.8 gpg, 8.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Narva safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Estonian laboratories report total hardness (üldkaredus) in mmol/L or mg-eq/L (1 mmol/L = 2 mg-eq/L = 100 mg/L CaCO₃); groundwater supplies are mostly hard.
How many grains per gallon is Narva water?
8.8 gpg, equal to 8.4 °dH, 15 °fH or 150 mg/L calcium carbonate.
What dishwasher salt setting should I use in Narva?
For 150 mg/L (8.4 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Narva?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Terviseamet, veevärkide veeproovid (avalikud andmed) 2021–2025 (2025-02). Method: own measurement. Terviseamet, veevärkide veeproovid (avalikud andmed) 2021–2025 · Outdated figure? Tell us