One of the most common questions before drilling is: how deep should a water well be? The answer mainly depends on the ground conditions and the level of the aquifer.

What does the depth of a well depend on?

There is no standard depth. The key factors are:

• Type of ground: rock, clay, sand…
• Water table level: where the water is located
• Geographical location
• Use of the well: domestic, agricultural or industrial
• Average depth of a well in Spain

As a guideline:

• Shallow wells: 20 – 50 metres
• Medium-depth wells: 50 – 100 metres
• Deep wells: more than 100 metres

In areas such as Tarragona or rural zones, it is common to find wells between 60 and 120 metres deep.

Relationship between depth and cost

The greater the depth:

• The higher the drilling cost
• The longer the execution time
• The greater the technical complexity

That is why it is important to drill only as deep as necessary.

Importance of a preliminary study

A ground study allows you to:

• Avoid unnecessary drilling
• Find water more quickly
• Optimise the budget

Conclusion

The ideal depth of a well depends on each specific terrain. A professional study is the best guarantee for obtaining water at the lowest possible cost.