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THE WATER IN CASCAIS · DISTRICT OF LISBOA

Tap water in Cascais.

Ayus installs and maintains 4-stage water filters at home, hidden under the kitchen sink. This page sets out what is known about the mains water in Cascais: where it comes from, who treats it and what it contains.

MUNICIPALITY · DISTRICT OF LISBOA

Cascais

WATER UTILITYÁguas de Cascais
WHERE THE WATER COMES FROM10 supply zones
<5 a 12Magnesium · mg/L
17 a 114Calcium · mg/L
54 a 324Hardness · mg/L CaCO₃

In Cascais, the water varies a lot from zone to zone. It is soft in Cascais, Estoril, Carcavelos and Quinta da Marinha, and very hard in Alcabideche, Manique and Penha Longa.

In most of the municipality the water is soft and low in magnesium: that is where the filter makes the biggest difference. In the hard-water zones, we let you know before the visit.

Sources: Águas de Cascais, 2024 monitoring. The values are the ones the water utility publishes; during the visit, we test the water in your kitchen.
WHAT THE FILTER DOES TO THE WATER IN CASCAIS
  • Removes the taste and smell of chlorine.
  • Holds back the sand and rust that building pipes add.
  • Holds back microplastics: the membrane pores measure [X] µm, and a microplastic is at least 1 µm.
  • Keeps the minerals and adds magnesium.
  • Does not remove limescale.
See how the filter works →

Questions about the water in Cascais

Where does the tap water in Cascais come from?

In Cascais, the water varies a lot from zone to zone. It is soft in Cascais, Estoril, Carcavelos and Quinta da Marinha, and very hard in Alcabideche, Manique and Penha Longa.

Who manages the water in Cascais?

The water utility is Águas de Cascais. It treats the water, distributes it and publishes the quality control results.

What values does the water in Cascais have?

Magnesium (mg/L): <5 a 12; Calcium (mg/L): 17 a 114; Hardness (mg/L CaCO₃): 54 a 324. Source: Águas de Cascais, 2024 monitoring. During the visit, we test the water in your kitchen.

Does the Ayus filter make a difference in Cascais?

In most of the municipality the water is soft and low in magnesium: that is where the filter makes the biggest difference. In the hard-water zones, we let you know before the visit.

Does Ayus install filters in Cascais?

We install in Lisbon, available right away, and other districts by appointment. Leave us your details and we will arrange a date.