Water in mauritius – A practical guide

The water distributed by the public network in Mauritius is potable: It is treated and tested according to national drinking water standards. however, The water that comes out of a tap does not always come directly From the network. in many homes, it first passes through a cistern, and its quality then depends on the maintenance Of that cistern. this is why, for drinking, bottled water remains the safest choice when you don't know the household.

The tap water is potable

The Central Water Authority (CWA), the public body that produces and distributes drinking water, clearly answers the question on its website: the water it supplies is treated and tested regularly to meet national drinking water standards, set in 1996 and enforced under the control of the Ministry of Health.

The treatment process follows a standard procedure. At the island's seven main treatment plants, raw water is clarified, settled, sand-filtered, and then disinfected with chlorine. Approximately sixty small pressure filtration units supplement the network. The CWA laboratory, accredited according to the international standard ISO/IEC 17025, takes samples from around 160 points across the island, from the source to the tap, and tests for coliform bacteria and E. coli.

The tanker is a game changer

The CWA guarantee covers the water it delivers. Once the water is stored in a home's cistern, its quality depends on the condition of the cistern: deposits, algae, a poorly closed lid, or neglected cleaning. The CWA recommends that individuals clean and disinfect their cisterns at least every six months and publishes a guide on how to do so. It explains that this cleaning is precisely what eliminates bacteria, algae, and sediment that can degrade the water.

A visitor renting a villa has no way of knowing when the cistern was last cleaned. Therefore, in a house equipped with a cistern, it's best not to drink the tap water.

Our advice: drink bottled water

In the villas where we stayed, we always drank bottled water, bought at the supermarket. It's available in supermarkets as well as in local shops. Tap water is perfectly safe for showering, washing dishes, or doing laundry.

At the hotel, the water supply depends on the establishment. The reception desk is best placed to tell you if the water in the rooms is safe to drink. For other health precautions during your stay, see our article on health and sanitary safety in Mauritius.

Mauritius' drinking water comes from rainwater, stored in two ways: in surface reservoirs and in groundwater extracted through drilling. According to Statistics Mauritius, by 2025, 56% of the drinking water produced was expected to come from surface water sources and 44% from boreholes. The CWA produces approximately one million cubic meters of treated water per day.

An island that receives plenty of rain, but very unevenly.

On average, the island receives just over 2,000 mm of rain per year, according to the Mauritius Meteorological Service. However, the distribution is very uneven. In Vacoas, on the central plateau, the meteorological service reports monthly averages of around 2,000 mm per year; in some upland catchments, this reaches 4,000 mm. In Médine, on the west coast, the total is only around 780 mm, and from August to October, the average monthly rainfall is less than 20 mm.

The island does not have a distinct rainy season, but two-thirds of the rain falls during the southern summer, from November to April. February and March are the wettest months, October the driest.

The reservoirs

Seven large reservoirs, with a total capacity of 92.2 million cubic meters, store surface water: Mare-aux-Vacoas, Midlands, Bagatelle, La Ferme, Mare Longue, La Nicolière, and Piton du Milieu. Mare-aux-Vacoas, the country's main reservoir, supplies Plaines Wilhems, Moka, and part of Rivière Noire; La Nicolière supplies a large part of the North. The trail of Sophie Nature Walk along the banks of Mare-aux-Vacoas: you can see the reservoir, but you can't swim in it, since it's used for drinking water.

To understand the topography that governs all of this, see our article on the geography of Mauritius.

In Mauritius, even under normal circumstances, the mains water supply is not continuous everywhere. The CWA distributes water by sector, according to schedules specific to each neighborhood, often with one period in the morning and another in the late afternoon or evening. Tables published by the cWA In june 2026 Show that before any restrictions, many areas of vacoas And belle-Rose received 8, 10, Or 12 hours Of water per day. others Receive water for much longer periods.

This system explains the presence of cisterns in so many houses. It also explains why a visitor can spend weeks in Mauritius without ever noticing that the mains water supply is interrupted: this is our case, even though we have been staying on the island regularly since 2001. The cistern takes over without us even realizing it.

To find out the timetables for a neighborhood, the easiest way is to call 170, the CWA line, or ask the neighbors.

A cistern is a reservoir of clean water for the house, placed on the ground or elevated, which fills up during distribution hours. An electric pump then supplies the taps and shower with adequate pressure, regardless of the time of day. It's a fairly common feature in Mauritius, but not all houses have one.

Be careful not to confuse it with a water heater. The tank seen on many Mauritian roofs, often connected to solar panels, is very often a water heater and not a water storage tank. To find out if a house has a cistern, the easiest way is to ask the owner.

Some practical consequences for those renting a house:

• The reserve is not infinite. If the cistern empties before the mains water supply returns, the taps stop working. This is rare under normal circumstances, but more frequent during periods of water restrictions.
• The pump depends on electricity. During a power outage, an electric pump stops, and with it the pressure at the taps.
• Without a cistern, the water follows the network's schedule. You then need to know the distribution times in the neighborhood and organize yourself accordingly.

Water restrictions in Mauritius come into effect at the end of the southern hemisphere winter, after a dry season. Reservoirs, filled by summer rains, must last from May to October, and they are at their lowest levels just before the return of the heavy rains in October and November. A weak rainy season, or a drier winter than usual, leads the authorities to reduce water distribution.

In those years, the government published Dry Season Regulations. There were regulations in 2022, 2025, and 2026. The 2026 regulations prohibited filling swimming pools with mains water, washing cars, yards, and driveways with a hose or pressure washer, and watering gardens with a hose. Fines could be severe: in 2026, up to Rs 50,000 and two years imprisonment for individuals. In 2026, the areas supplied by Mare-aux-Vacoas, Plaines Wilhems, and Moka were the first to be affected.

The situation can change very quickly. In June 2024, the reservoirs were 95% full: we were on site and experienced neither outages nor cloudy water. In 2025, the level in Mare-aux-Vacoas jumped from 38.5% in March to 99.9% in August. A predicted shortage, therefore, tells you nothing about what you will find a few months later. For the current situation, see our page on water cuts in Mauritius, updated with each CWA press release.

For information on seasons and climate in general, see our article on the weather in Mauritius.

Water cuts aren't solely caused by drought. After very heavy rainfall, rivers carry mud, and the CWA automatically shuts down the affected filtration units to protect their filters. Distribution can then be interrupted in the areas they supply, even with full reservoirs, until the raw water clears.

When the water is turned back on after a cut-off or maintenance work, it may also run cloudy or brownish for a while: pressure variations stir up sediment and iron oxide deposits in the pipes. As a precaution, it's best not to drink or cook with it until it runs clear. The CWA asks that you report any cloudy water, unusual odor, or taste to 170.

When arriving at a villa or rental house, asking the owner or agency three questions will help avoid most unpleasant surprises:

• does the house have a cistern, and how long can it last without mains Water?
• at what times does the mains water arrive in this Area?
• where is the pump located, and what should I do if it stops?

During the stay:

• To drinkBottled water, especially if there is a cistern.
• To avoid emptying the cisternShort showers, and the washing machine or dishwasher only when fully loaded.
• The swimming pool it is the owner's responsibility. During periods of restrictions, topping it up with a hose is prohibited.
• The garden and the car : during periods of restrictions, neither watering with a hose nor washing with a jet.

The Central Water Authority (CWA) produces and distributes drinking water in Mauritius. They are the ones to contact regarding water outages, cloudy water, or the opening hours for a specific area.

• Helpline : 170 (from Mauritius)
• WhatsApp : +230 5500 0025
• Standard : +230 601 5000
• E-mail Infodesk@cwa.mu
• Seat : 150 St Paul Road, Vacoas-Phoenix
• Official website : cwa.govmu.orgWhere press releases and the tank cleaning guide are published
• Facebook Page : facebook.com/cwa170

Is the tap water safe to drink In Mauritius?

Public water is safe to drink: the CWA treats and tests it according to national standards. However, in a house with a cistern, its quality depends on the cistern's maintenance. For drinking, bottled water is the safest choice when you don't know the house's water quality.

Is it safe to drink the tap water in the hotel?

It depends on the establishment and its supplies. Ask at reception.

Why do Mauritian houses have a cistern?

Because the mains water is distributed by sector and at certain times, even under normal circumstances. The cistern fills up during distribution hours and a pump supplies the house the rest of the time.

Should a water tank be Cleaned?

Yes. The CWA recommends cleaning and disinfecting it at least every six months, and publishes a guide on its website detailing the method.

Where can I buy bottled water in Mauritius?

In supermarkets as well as in local shops.

Are there water cuts in Mauritius?

Distribution is scheduled in many areas, even under normal circumstances, and restrictions are sometimes imposed at the end of the dry season. For the current situation, see our page on water cuts in Mauritius.

When does Mauritius experience a water shortage?

At the end of the southern winter, especially in October and November, when the winter has been dry and before the return of the summer rains. The restrictions do not reappear every year.

Why is the water brown from the tap?

After a water outage or maintenance work, pressure fluctuations can stir up sediment and iron oxide in the pipes. Wait until the water runs clear before drinking or cooking with it, and call 170 if the problem persists.

Is it safe to swim in the reservoirs?

No. Reservoirs like Mare-aux-Vacoas are used for drinking water: they are not swimming areas.