Water hardness in Sete Rios
76 mg/L moderately hard
Tap water in Sete Rios is moderately hard: 76 mg/L (4.5 gpg · 4.3 °dH · 7.6 °fH).
Source: EPAL - Torneiras na Cidade de Lisboa, junho 2026 (2026-06) · data checked 2026-11-05
Sete Rios is supplied by EPAL, the Lisbon utility. EPAL's June 2026 report for the city gives 76.2 mg/L CaCO₃, moderate, and this is a city-wide figure, not a measurement for the Sete Rios district alone. Expect some limescale on taps and heating elements over time, but not the heavy build-up seen in harder regions.
Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
Water data
| Total hardness | 76 mg/L |
|---|---|
| Utility | EPAL - Empresa Portuguesa das Aguas Livres, S.A. |
How Sete Rios compares
- Tap water in Sete Rios is 9 % softer than the median of the 77 cities we track in Portugal (83 mg/L).
- By hardness it ranks 42 of 77 in Portugal (1 = hardest); 43 % of these cities have softer water.
- In 14 it is number 5 of 19 cities; the regional median is 75 mg/L.
- Nearest city with clearly softer water: Alfornelos, 4 km away (42 mg/L).
- Nearest city with clearly harder water: Corroios, 11 km away (232 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 Sete Rios
| Brand | Setting for this water |
|---|---|
| Bosch | H00 |
| Miele | 4 °dH |
| AEG / Electrolux | 2 |
| Beko | 1st |
| 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 Sete Rios water hard or soft?
It is moderately hard: 76 mg/L as CaCO₃ (4.5 gpg, 4.3 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Sete Rios 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 Sete Rios water?
4.5 gpg, equal to 4.3 °dH, 7.6 °fH or 76 mg/L calcium carbonate.
What dishwasher salt setting should I use in Sete Rios?
For 76 mg/L (4.3 °dH) check your manufacturer's table: level 2–3.
Do I need a water softener in Sete Rios?
Not essential; a scale inhibitor protects the heater cheaply.
Source
Source: EPAL - Torneiras na Cidade de Lisboa, junho 2026 (2026-06). Method: figure published by the water supplier. EPAL - Torneiras na Cidade de Lisboa, junho 2026 · Outdated figure? Tell us