Water hardness in Porvoo
2.8 °dH soft
Tap water in Porvoo is soft: 2.8 °dH (50 mg/L · 2.9 gpg · 5 °fH).
Source: Porvoon Vesi - Tietoa vedestä ja vedenottamoista (2026) · data checked 2026-10-23
Range across supply zones: 40–60 mg/L.
Finnish waterworks use lake water, often treated or recharged through glacial esker deposits, or natural groundwater. The bedrock is mostly granite and gneiss, which usually gives soft water. The reported hardness is 50.0 mg/L CaCO₃, with measurements from 40.0 to 60.1 mg/L. Kettles and heaters stay fairly clear of scale at this level.
Finnish waterworks report hardness in °dH; most supplies are soft.
Water data
| Total hardness | 2.8 °dH |
|---|---|
| Utility | Porvoon Vesi (Liikelaitos Porvoon Vesi) |
How Porvoo compares
- Tap water in Porvoo is 19 % softer than the median of the 76 cities we track in Finland (3.5 °dH).
- By hardness it ranks 57 of 76 in Finland (1 = hardest); 23 % of these cities have softer water.
- Nearest city with clearly softer water: Hollola, 68 km away (1.8 °dH).
- Nearest city with clearly harder water: Järvenpää, 33 km away (3.7 °dH).
Ranking of the hardest and softest water in Finland →
What it means at home
- Little or no limescale in kettles, water heaters or washing machines.
- Soap lathers easily; water does not dry skin or hair.
- Dishwasher: salt setting at minimum or off.
- No softener needed; a jug filter only changes taste.
How much salt will you use for softening?
No. Water this soft does not need softening.
Descale a coffee machine or kettle about every 6 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Porvoo
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 3 °dH |
| AEG / Electrolux | 1 |
| Beko | 1st |
| Hoover | S0 |
| LG | H0 |
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 Porvoo water hard or soft?
It is soft: 50 mg/L as CaCO₃ (2.9 gpg, 2.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Porvoo safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Finnish waterworks report hardness in °dH; most supplies are soft.
How many grains per gallon is Porvoo water?
2.9 gpg, equal to 2.8 °dH, 5 °fH or 50 mg/L calcium carbonate.
What dishwasher salt setting should I use in Porvoo?
For 50 mg/L (2.8 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Porvoo?
No. With soft water a softener adds nothing.
Source
Source: Porvoon Vesi - Tietoa vedestä ja vedenottamoista (2026). Method: computed from supplier's calcium and magnesium. Porvoon Vesi - Tietoa vedestä ja vedenottamoista · Outdated figure? Tell us