Water hardness in Damaia
42 mg/L soft
Tap water in Damaia is soft: 42 mg/L (2.4 gpg · 2.3 °dH · 4.2 °fH).
Source: SMAS Sintra - Qualidade da água entregue ao concelho de Oeiras e Amadora, 1º trimestre 2026 (2026) · data checked 2026-10-23
EPAL water is delivered to the municipality through SIMAS Oeiras e Amadora. The reported hardness is 41.5 mg/L CaCO₃. Limescale is a minor issue here; a softener is unlikely to be necessary.
Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
Water data
| Total hardness | 42 mg/L |
|---|---|
| Utility | SIMAS Oeiras e Amadora (água EPAL entregue ao concelho) |
How Damaia compares
- Tap water in Damaia is 50 % softer than the median of the 77 cities we track in Portugal (83 mg/L).
- By hardness it ranks 64 of 77 in Portugal (1 = hardest); 11 % of these cities have softer water.
- In Lisboa it is number 8 of 13 cities; the regional median is 50 mg/L.
- Nearest city with clearly softer water: Vila Franca de Xira, 30 km away (15 mg/L).
- Nearest city with clearly harder water: Pontinha, 2 km away (86 mg/L).
Ranking of the hardest and softest water in Portugal →
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 Damaia
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 2 °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 Damaia water hard or soft?
It is soft: 42 mg/L as CaCO₃ (2.4 gpg, 2.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Damaia safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
How many grains per gallon is Damaia water?
2.4 gpg, equal to 2.3 °dH, 4.2 °fH or 42 mg/L calcium carbonate.
What dishwasher salt setting should I use in Damaia?
For 42 mg/L (2.3 °dH) check your manufacturer's table: level 0–1, usually no salt.
Do I need a water softener in Damaia?
No. With soft water a softener adds nothing.
Source
Source: SMAS Sintra - Qualidade da água entregue ao concelho de Oeiras e Amadora, 1º trimestre 2026 (2026). Method: figure published by the water supplier. SMAS Sintra - Qualidade da água entregue ao concelho de Oeiras e Amadora, 1º trimestre 2026 · Outdated figure? Tell us