Water hardness in Espinho
122 mg/L hard
Tap water in Espinho is hard: 122 mg/L (7.1 gpg · 6.8 °dH · 12.2 °fH).
Source: CM Espinho - Dados do controlo da qualidade da água, 4.º trimestre 2025 (2025) · data checked 2026-10-29
Range across supply zones: 113–130 mg/L.
Espinho's municipal edital for Q4 2025 prints two hardness samples for the Espinho supply zone, 113 and 130 mg/L CaCO₃. The 121.5 mg/L shown is the midpoint of the two, not an average of many readings. This is at the border between moderate and hard, so expect scale on kettles and taps. A descaler or filter helps.
Portuguese operators report "dureza total" in mg/L CaCO₃ to ERSAR.
Water data
| Total hardness | 122 mg/L |
|---|---|
| Utility | Câmara Municipal de Espinho |
How Espinho compares
- Tap water in Espinho is 46 % harder than the median of the 77 cities we track in Portugal (83 mg/L).
- By hardness it ranks 8 of 77 in Portugal (1 = hardest); 91 % of these cities have softer water.
- In Aveiro it is number 1 of 6 cities; the regional median is 97 mg/L.
- Nearest city with clearly softer water: Porto, 16 km away (96 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 Espinho
| Brand | Setting for this water |
|---|---|
| Bosch | H01 |
| Miele | 7 °dH |
| AEG / Electrolux | 2 |
| Beko | 2nd |
| 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 Espinho water hard or soft?
It is hard: 122 mg/L as CaCO₃ (7.1 gpg, 6.8 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Espinho 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 Espinho water?
7.1 gpg, equal to 6.8 °dH, 12.2 °fH or 122 mg/L calcium carbonate.
What dishwasher salt setting should I use in Espinho?
For 122 mg/L (6.8 °dH) check your manufacturer's table: level 4–5.
Do I need a water softener in Espinho?
Recommended if you have a water heater, boiler or tankless unit: it saves repairs and detergent.
Source
Source: CM Espinho - Dados do controlo da qualidade da água, 4.º trimestre 2025 (2025). Method: computed from supplier's calcium and magnesium. CM Espinho - Dados do controlo da qualidade da água, 4.º trimestre 2025 · Outdated figure? Tell us