Water hardness in Amarante
100 mg/L moderately hard
Tap water in Amarante is moderately hard: 100 mg/L (5.8 gpg · 5.6 °dH · 10 °fH).
Source: ADP - Qualidade da água para consumo humano, 2.º trimestre 2026 (Amarante) (2026-08) · data checked 2026-10-29
Amarante is supplied through ADP, whose Q2 2026 report prints one hardness analysis of 100 mg/L CaCO₃ at the bulk delivery point. One result is indicative only. This is moderate water, near the border with hard, so a kettle will show a scale film over time.
Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
Water data
| Total hardness | 100 mg/L |
|---|---|
| Utility | Águas do Douro e Paiva (ADP), concelho Amarante |
How Amarante compares
- Tap water in Amarante is 20 % harder than the median of the 77 cities we track in Portugal (83 mg/L).
- By hardness it ranks 12 of 77 in Portugal (1 = hardest); 84 % of these cities have softer water.
- In Porto it is number 1 of 14 cities; the regional median is 98 mg/L.
- Nearest city with clearly softer water: Baião, 13 km away (26 mg/L).
Ranking of the hardest and softest water in Portugal →
What it means at home
- Visible kettle scale every few weeks; vinegar or citric acid is enough.
- Water heater and washing machine: some long-term scale; a scale inhibitor slows it.
- Dishwasher: medium salt setting.
- Softener optional; pays off mainly with a gas boiler or tankless heater.
How much salt will you use for softening?
Optional. A scale inhibitor or a small softener protects the heater; soap savings are modest.
Descale a coffee machine or kettle about every 3 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Amarante
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 6 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| Hoover | S1 |
| LG | H1 |
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 Amarante water hard or soft?
It is moderately hard: 100 mg/L as CaCO₃ (5.8 gpg, 5.6 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Amarante 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 Amarante water?
5.8 gpg, equal to 5.6 °dH, 10 °fH or 100 mg/L calcium carbonate.
What dishwasher salt setting should I use in Amarante?
For 100 mg/L (5.6 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Amarante?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: ADP - Qualidade da água para consumo humano, 2.º trimestre 2026 (Amarante) (2026-08). Method: figure published by the water supplier. ADP - Qualidade da água para consumo humano, 2.º trimestre 2026 (Amarante) · Outdated figure? Tell us