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The most reliable way to find out whether well water is safe to drink is to have it tested in a laboratory. Clear water with no unpleasant smell or taste is not necessarily safe for consumption. A proper water analysis should check, among other parameters, for the presence of microorganisms and certain chemical contaminants.

There are also water quality testing companies that can collect samples and carry out the analysis. Home testing kits can provide useful guidance on certain parameters, but they do not replace a complete drinking water analysis.

How can you tell if well water is safe to drink?

1. Collect a water sample correctly.
2. Take it to a laboratory.
3. Carry out a microbiological analysis.
4. Carry out a physical and chemical analysis.
5. Compare the results with the applicable drinking water quality standards.
6. If a problem is detected, determine the most suitable treatment.

What tests should be carried out on well water?

Depending on the source of the water and its intended use, the following parameters may be tested:

• Physical and chemical analysis
• pH
• Conductivity
• Nitrates
• Ammonium
• Iron
• Manganese
• Chlorides
• Sulphates
• Hardness
• Other relevant parameters

Other contaminants

The appropriate analysis will depend on the characteristics of the ground, the surrounding environment and any possible sources of contamination.

For example, in certain areas it may be particularly important to check nitrate levels, especially where there is nearby agricultural or livestock activity.

What problems can well water have and what solutions are available?

Well water can present different quality problems depending on the characteristics of the ground, the condition of the well and the activities taking place nearby. Some problems may be detected by the colour, smell or taste of the water, while others, such as certain microbiological or chemical contaminants, are not visible to the naked eye.

For this reason, before using well water for human consumption, it is advisable to have it tested to determine its quality and identify any treatment it may require.

Nitrates in well water

Nitrates can be found in groundwater and, in certain areas, may be associated with agricultural and livestock activities, the use of fertilisers or other sources of contamination.

One of the main issues with nitrates is that the water may look completely normal even when nitrate levels are high.

How can nitrates be removed from well water?

The first step is to carry out a water analysis to determine the nitrate concentration. If the results show that nitrate levels need to be reduced, specific treatment systems can be used, such as certain reverse osmosis or ion exchange systems. The most suitable option will depend on the water quality and its intended use.

Bacteria and microbiological contamination

Well water can become microbiologically contaminated for a number of reasons. Poorly protected wells, surface water infiltration, problems with the installation or nearby activities may allow microorganisms to enter the water supply.

In addition, microbiologically contaminated water can still appear clear and colourless and may have no unusual smell.

How can bacteria be removed from well water?

The first step is to carry out a microbiological analysis to identify the problem and investigate the source of the contamination. Depending on the results and the characteristics of the installation, it may be necessary to disinfect the well or install a treatment system such as chlorination or ultraviolet (UV) disinfection.

Iron and manganese in well water

Iron and manganese are relatively common in certain types of groundwater and may be associated with the geological characteristics of the surrounding area.

These elements can cause problems such as:

• Yellow, brown or dark discolouration.
• Stains on sanitary fittings and clothing.
• Metallic taste.
• Deposits and problems in pipes.
• Changes in the characteristics of the water.

How can iron be removed from well water?

The first step is to determine the concentration of iron and manganese through a water analysis. Depending on the concentration and the characteristics of the water, oxidation and filtration systems, iron removal filters or specific manganese treatment systems may be used.

Hard water and excess limescale

Water hardness is mainly caused by minerals such as calcium and magnesium. High water hardness can cause limescale build-up on taps and showers, deposits in pipes and problems with water heaters and household appliances, among other issues.

How can limescale be removed from well water?

If hardness is the main problem, installing a water softener may be considered. Water softeners reduce the concentration of certain minerals responsible for water hardness.

It is important to distinguish between hard water and non-potable water: a high limescale content does not necessarily mean that the water is unsafe to drink.

Turbidity, sand and sediment

If well water appears cloudy or contains particles or sand, there may be a problem related to the water intake, the surrounding ground, the well itself or the pumping system.

How can well water be filtered?

Depending on the cause of the problem, it may be necessary to inspect and clean the well, review or modify the water intake system and install suitable sediment filtration systems.

If there is also microbiological or chemical contamination, filtration alone will not necessarily solve the problem.

What should you do if the analysis shows that the water is not safe to drink?

1. Identify which parameter is outside the recommended or permitted range.
2. Determine the source of the problem.
3. Inspect the condition of the well and the installation.
4. Choose the appropriate treatment.
5. Test the water again after treatment.

There is no single treatment system that is suitable for every well. The most appropriate solution depends on the contaminants or parameters detected during the analysis and on how the water will be used.