Can I drill a well in my garden in Luxembourg?
Not freely: any borehole or well meant to draw groundwater needs an authorisation. Contrary to a widespread belief, the groundwater beneath your land does not belong to you: it is a common resource protected by the amended Law of 19 December 2008 on water. Before digging, you need a water authorisation granted by the Minister for the Environment and handled by the Water Management Administration (AGE). For a new borehole the procedure runs in two phases: first the authorisation to drill and carry out pumping tests, then a second authorisation to operate the well. This duty applies to any person, private or public — so also the individual who wants to water the vegetable patch. Connecting to the public water network, by contrast, needs no authorisation. The myth: "it's my land, I drill my well without asking" — false; drilling without a ministerial order is acting unlawfully, especially in a protection zone.
📋 The rules
- Authorisation required: drawing groundwater and creating a borehole are subject to the water authorisation (amended Law of 19 December 2008).
- Two phases for a new borehole: phase 1, authorisation to drill and run pumping tests; phase 2, authorisation to operate the well once the yield is known.
- Competent authority: the decision belongs to the Minister for the Environment; the file goes to the Water Management Administration (via MyGuichet.lu or by post).
- Everyone is covered: the duty applies to any natural or legal person, private or public, including for domestic or garden use.
- Other permits still needed: the water authorisation does not replace the building permit, nature protection or the rules inside a catchment protection zone.
🔓 Exceptions
- Network connection: connecting to the public sewer and the drinking-water distribution network is not subject to a water authorisation.
- Geothermal borehole: a vertical geothermal probe does not escape control — it needs a specific authorisation form from the AGE.
- Protection zones: inside a catchment protection zone a borehole may be forbidden or subject to reinforced conditions, with a tightly framed derogation.
⚠️ Penalties & fines
Drilling without authorisation means an illegal structure and an environmental risk. The subject of the application may be neither built nor operated before the ministerial order: digging first exposes you to a stop order, to the duty to backfill the borehole and restore the site, at the offender's expense. The water law provides sanctions for unauthorised abstraction and works; the exact amount is not shown on the administrative sheet, but the offence is very real. In a protection zone around a drinking-water catchment the consequences are heavier still, because a badly made borehole can contaminate the aquifer and engage your liability for the pollution. An undeclared well also complicates the sale of the property and may deny cover for water damage linked to the structure. Finally, a botched borehole weakens neighbouring foundations and opens a neighbour dispute.
📎 Official sources
- Water Management Administration · catchment and authorisation (official portal) →
- Guichet.lu · water authorisation (boreholes and wells) →
- Legilux · amended Law of 19 December 2008 on water →
❓ Frequently asked
Do I need an authorisation for a simple watering well?
Yes: as soon as you draw groundwater, the water authorisation is required, even for private garden use. Only connecting to the public water network escapes this duty, because the water in the aquifer remains a protected common resource.
Why is the procedure in two phases?
The first authorisation lets you drill and run pumping tests to measure the usable yield without risk to the aquifer. The second then authorises operating the well on the basis of those results, which avoids pumping beyond what the resource can sustain.
Who do I send my application to?
The file goes to the Water Management Administration, online via MyGuichet.lu or by post, and the decision is taken by the Minister for the Environment. Notification is in principle within three months of confirmation that the file is complete.
Does a geothermal borehole follow the same rules?
Yes: a geothermal probe or borehole comes into contact with groundwater and needs a specific authorisation from the AGE. It therefore requires a separate step from an air-to-water heat pump, which does not touch the aquifer.
What if my land is in a protection zone?
In a drinking-water catchment protection zone a borehole may be outright forbidden or subject to reinforced conditions to protect the resource. A tightly framed derogation is sometimes possible, but it is granted case by case and never as of right.
🔎 Common searches
What people search to land here:
- “drill a well authorisation luxembourg”
- “garden borehole water law luxembourg”
- “water management administration borehole”
- “groundwater well authorisation luxembourg”
- “geothermal borehole authorisation luxembourg”
- “groundwater abstraction law 2008 luxembourg”