Real Estate

Regulating the Water Pressure in Your Mexican Home

The majority of Mexico's water delivery is not served by pressurized systems, requiring some ingenuity to create water pressure in your home or building

Woman Showering

In some countries, water from the mains water system is pressurized when it arrives at homes and other buildings.  This is not usually the case in Mexico, so home owners need to implement some solutions to create a pressurized water system that will keep water flowing at the property.

How water is delivered in Mexico

Water in Mexico is usually delivered to homes in one of four ways:

  • via mains-feed system; or
  • via a communal feed sourced from official local water springs and wells; or
  • via a private well situated on the property or in the local neighborhood (although this is rare); or
  • via a combination of rain collection (in season) and local water delivery by truck.

None of these provide provide the constant pressure needed to move the water effectively around your property’s pipework, and especially for use in upstairs showers and taps on second or third story rooms, and to have sufficient pressure to water your garden with a hose or sprinkler, for example.

The importance of your home’s cistern

Almost all properties in Mexico have a cistern to collect and store water—regardless of whether you get water from a mains-fed system, a communal feed, rain water collection, or a combination.

The low pressure water feed from the mains-fed and communal water distribution systems is sufficient to fill these underground water storage areas, usually via a pipe that runs just below the surface of the street level. (Mains-fed systems might have sufficient pressure to fill a tank on a low roof, but you ought not count on this.)

If you have water deliveries made by truck and/or collect rainwater during the rainy season, that water will be channeled into your property’s cistern.

Cisterns sizes are expressed in liters and cubic meters: one cubic meter of cistern will store 1,000 liters (264 US gallons) of water.  They’re usually made of concrete and vary in size. Some homeowners dig a big hole, line it with concrete, and place a plastic tank in that space —a large tank for domestic use will store around 11,000 liters of water— leaving a service lid for access and maintenance to the tank inside; however, most cisterns are built using concrete that stores the water directly.

Cisterns (and tanks) need cleaning occasionally to clear sediment that inevitably builds-up on the cistern’s base, and algae that may begin to propagate around the top edges of the high waterline.

Smaller homes will usually store around 3000-4000 liters of water inside a small concrete cistern; mid sized homes may have cisterns of about 10,000 liters, larger homes, condos and apartment buildings, and properties with extensive gardens may have two or more cisterns with a capacity to store 50,000 or more liters of water on the property.

Water storage is especially prevalent during the dry season, when there’s no rainwater to collect, and mains-feed systems, which are usually intermittent and deliver water once every few days, often reduce delivery schedules during acute dry spells between November and May to conserve water in the area they serve.

Cisterns filled from mains-fed water or communal water networks have a float valve installed that shuts-off the incoming water when the cistern is filled.  Cisterns that are filled using rain water have overflow systems that prevent additional rainwater from accumulating when they’re full.

Creating water pressure for your property in Mexico

There are two principal ways of creating pressure within your home, building, or property.  The first, which is a gravity-led pressure system is almost universal even if you use the second method, which is to install a hydro-pump within your home’s water system.

El Tinaco—The water reservoir on your roof

If you’re familiar with Mexico you will have seen water tanks everywhere, situated atop roofs on homes and buildings across the country.  The older ones are made of cement; modern versions are made using a special type of plastic. Some of these tanks are mounted on a tower or base to give them additional height.  The additional height creates additional pressure below, that is especially useful in upstairs shower rooms.

An electric pump moves water from the cistern to the tinaco; the pump is usually automated: it switches on when the float valve in the tinaco falls below a certain level, and stops when it’s full, preventing the water reservoir on the roof from overflowing.

Rooftop reservoirs in private homes usually store between 1,000 and 2,000 liters of water; in condos and other buildings that serve multiple units below these tanks may be larger, although the water is usually stored (and thus the weight distributed) across multiple smaller tanks.

When the water from the cistern is pumped to your roof, gravity takes over.  The higher the tank is situated on the roof, the more pressure you’ll have below.  A tank on on a small tower above the roof of a two-story home provides plenty of pressure for upstairs and downstairs showers, and to power 100-foot long hosepipes connected to downstairs taps; note that upstairs showers on two-story homes will require the reservoir to rest on a tower above the roofline to create sufficient pressure and water volume.

Installing a hydro-pump

Some people choose to install a hydro-pump on their property that keeps the water pipes under a constant pressure throughout the home.  The hydro-pump is integrated into the pipe system and every so often switches on to top-up pressure lost when you switch on a tap, or shower.  Talk to a plumber about how to buy the right one for your needs, and to install it correctly.

The better quality hydro-pumps have a water reservoir of their own (usually 100-200 liters) that is kept under pressure and will keep the water flowing in your home, even if there’s a power cut preventing the hydro-pump from switching on and restoring pressure.

Some homes have a tank on the roof in addition to a hydro-pump to keep some pressure in the system even if the power fails or the hydro-pump breaks down.

If you install a hydro-pump, you’ll need to take into account how your pipework is configured, especially if it’s older—be sure it (or its joints) as well as any water heaters you have installed can withstand the pressure.  Also, if you use a solar water heating system, make sure that the unit is compatible with hydro-pumps: some models will leak or burst if the water in them is placed under too much pressure.

Learn more about maintaining your home in Mexico

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7 Comments

  1. Michael Watkins says

    Another technology to consider is an Atmospheric water generator. The devices is basically a dehumidifier which removes the moisture from filtered air and collects it in a tank, where it is then pumped through a filter and UV light and sent to whatever use you want. They are very reliable for drinking water on a whole house use, but get rather expensive for an entire off grid water supply.
    They range from $2,000 for a daily drinking water source system to from
    $10,000 to $50,000 for whole house use depending on your water needs.

  2. MITCH says

    A cistern and tinaco is a good way to go
    I live in Mazatlan and do not have a cistern but I have 2 tinacos 1850 liters of water
    The city water pressure is enough to fill the tinacos at night
    I installed a 1 hp pressure pump on the roof so have pressure for the whole house
    Tinacos come in a tan color so are not ugly
    UV lamps are ok but it MUST be located at POU / point of use like under your kitchen sink & UV lamps only kill bacteria
    You don’t have purified drinking water using a UV lamp
    You must have an reverse osmosis system to have purified drinking water
    I have been in the water business since 1994

  3. panaharoldo says

    An alternative to the unsightly tinaco is to dig your own well and have an air pressure tank. It cost us about $4K usd to install a 21 meter well with submersible pump, 5 gallon air pressure pump, and whole house ultraviolet water filter to kill any bacteria. This did not cost much more than going the cistern, tinaco, and tower route explained in this article. The payoff is 24*7 clean and pressurized water without the ugly tank on our roof, as well as independence from any conditions associated with availability and health qualities with the public water supply.

    • Michael Watkins says

      You do know that most homes in Mexico have fosas (or septic tanks) which leach the liquid contents of your septic system into the soil. If the soil is good for this, it can leach into the same water layer as your well.
      Maybe not so clean water as you think.

      • Bobo says

        MANY homes in America have septic tanks too.Fyi

    • Mexperience says

      panaharoldo: You need a special permit to drill a water well in Mexico. You cannot simply drill down to the water level and extract the water that way.

      Michael: a propertly installed septic tank system doesn’t pollute the property’s fresh water supply.

  4. Charles Bates says

    Great piece of information on the water system for a home in Mexico. My wife and I are planning to buy a home in Mexico and this article has been an extremely helpful eye opener.

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