Water hardness in Senhora da Hora
98 mg/L moderately hard
Tap water in Senhora da Hora is moderately hard: 98 mg/L (5.7 gpg · 5.5 °dH · 9.8 °fH).
Source: ADP - Qualidade da água para consumo humano, 2.º trimestre 2026 (Matosinhos) (2026-08) · data checked 2026-10-29
Senhora da Hora lies in Matosinhos, so this page uses ADP's Q2 2026 concelho report: one analysis of 98 mg/L CaCO₃ at the bulk delivery point. The local network is not reported separately, so the figure is not specific to the parish. Moderate hardness means scale builds up slowly.
Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
Water data
| Total hardness | 98 mg/L |
|---|---|
| Utility | Águas do Douro e Paiva (ADP), concelho Matosinhos |
How Senhora da Hora compares
- Tap water in Senhora da Hora is 18 % harder than the median of the 77 cities we track in Portugal (83 mg/L).
- By hardness it ranks 14 of 77 in Portugal (1 = hardest); 76 % of these cities have softer water.
- In Porto it is number 3 of 14 cities; the regional median is 98 mg/L.
- Nearest city with clearly softer water: Penafiel, 31 km away (55 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 Senhora da Hora
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 5 °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 Senhora da Hora water hard or soft?
It is moderately hard: 98 mg/L as CaCO₃ (5.7 gpg, 5.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Senhora da Hora 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 Senhora da Hora water?
5.7 gpg, equal to 5.5 °dH, 9.8 °fH or 98 mg/L calcium carbonate.
What dishwasher salt setting should I use in Senhora da Hora?
For 98 mg/L (5.5 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Senhora da Hora?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: ADP - Qualidade da água para consumo humano, 2.º trimestre 2026 (Matosinhos) (2026-08). Method: figure published by the water supplier. ADP - Qualidade da água para consumo humano, 2.º trimestre 2026 (Matosinhos) · Outdated figure? Tell us