Water hardness in Barreiro
150 mg/L hard
Tap water in Barreiro is hard: 150 mg/L (8.8 gpg · 8.4 °dH · 15 °fH).
Source: Câmara Municipal do Barreiro - Qualidade da água, zona Z2 Sete Portais, 2.º trimestre 2026 (2026-08) · data checked 2026-10-22
Barreiro is supplied by its local water utility. Northern and central Portugal sit largely on granite and schist, which gives soft water, while limestone in the south and centre makes it harder. The reported hardness is 150.0 mg/L CaCO₃. Limescale is visible on kettles, taps and heaters, and a scale-reduction filter or softener can help protect appliances.
Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
Water data
| Total hardness | 150 mg/L |
|---|---|
| Utility | Câmara Municipal do Barreiro (entidade gestora, PCQA) |
How Barreiro compares
- Tap water in Barreiro is 80 % harder than the median of the 77 cities we track in Portugal (83 mg/L).
- By hardness it ranks 4 of 77 in Portugal (1 = hardest); 95 % of these cities have softer water.
- In 19 it is number 3 of 4 cities; the regional median is 158 mg/L.
- Nearest city with clearly softer water: Areeiro, 10 km away (76 mg/L).
- Nearest city with clearly harder water: Corroios, 7 km away (232 mg/L).
Ranking of the hardest and softest water in Portugal →
What it means at home
- Fast scale on taps, shower screens and kettle; white spots on glassware.
- Water heater: efficiency loss and element failures within years if unprotected.
- Dry skin and dull hair after showering are common.
- Softener recommended; jug or reverse osmosis for drinking.
How much salt will you use for softening?
Recommended, especially with a heater or boiler: scale cuts efficiency and shortens its life.
Descale a coffee machine or kettle about every 2 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Barreiro
| Brand | Setting for this water |
|---|---|
| Bosch | H02 |
| Miele | 8 °dH |
| AEG / Electrolux | 2 |
| Beko | 3rd |
| Hoover | S1 |
| LG | H2 |
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 Barreiro water hard or soft?
It is hard: 150 mg/L as CaCO₃ (8.8 gpg, 8.4 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Barreiro 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 Barreiro water?
8.8 gpg, equal to 8.4 °dH, 15 °fH or 150 mg/L calcium carbonate.
What dishwasher salt setting should I use in Barreiro?
For 150 mg/L (8.4 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Barreiro?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: Câmara Municipal do Barreiro - Qualidade da água, zona Z2 Sete Portais, 2.º trimestre 2026 (2026-08). Method: figure published by the water supplier. Câmara Municipal do Barreiro - Qualidade da água, zona Z2 Sete Portais, 2.º trimestre 2026 · Outdated figure? Tell us