Note
Private wells in Spain: the rules
Quick answer
The Ebro basin authority describes the regime for owners: use of up to seven thousand cubic metres a year, on the same plot, is registered in the water register before use. Prior authorisation is needed in listed cases, wells must keep distances, and a meter is requested. Other basins may differ.
Applies toOwners and buyers of country property with a well or plans for one.
On this page: 9 sections
§ 1Who regulates
Water in Spain belongs to the public domain, and river basin authorities, the confederaciones hidrográficas, manage its use. The water law lets the owner of a plot use groundwater under certain conditions, without a concession. We could not read the consolidated text of the article that sets this, so this page relies on the published instructions of the Ebro basin authority, which apply the article. This page belongs to the chapter on rural services explained.
§ 2The owner’s regime
According to those instructions, the use is a right by operation of law, exercised only by the owner of the land, when the annual volume is no more than seven thousand cubic metres a year from one or several wells and the water is used only on the same plot. Anything else needs a concession. The owner must register the well in the water register of the authority before using it. The instructions say the authority decides within six months of registration.
§ 3Documents and meter
The Ebro instructions list the documents: identity, a technical description of the well, a justification of the water needs, location plans and proof of ownership. They say a cadastral certificate or a private document is not accepted as proof. They also ask for a metering system, usually a volumetric meter, under a ministerial order.
§ 4When authorisation comes first
The instructions say prior authorisation is needed before drilling if the well is in the police zone of a watercourse, affects a wetland, lies in an aquifer at risk of failing good status, or needs an environmental assessment or a report from another administration. If unsure, the authority recommends requesting authorisation. Otherwise registration may be refused, the well may have to be sealed and sanctions may follow.
§ 5Distances
The instructions set a minimum distance of one hundred metres between wells, with exceptions for small flows, and larger distances in listed aquifers. The distances come from the hydrological plan of each basin, so other basins may have other figures. A neighbour’s well may therefore limit what you can do.
§ 6Existing wells
The instructions treat legalisation of an existing well as registration if the conditions are met, and a concession if not. They give no separate procedure. More on buying a home with a well explains what to check when you are buying a property with a well.
§ 7Other uses
Using well water for drinking, for a pool or for animals raises further questions, such as quality and use limits. We did not find official guidance on these. Ask the authority and a laboratory. More on septic tanks explains the sewage side, which affects groundwater.
§ 8What we could not verify
We read one basin’s instructions, not the water law article or the instructions of other basins. Rules and plans change.
§ 9More on this topic
More on electricity for a rural home explains grid connection and off-grid power for a rural Spanish home.
FAQRelated questions
Can I dig a well on my land?
Possibly, but not freely. The river basin authority regulates it. Registration before use is required for the owner’s regime, and prior authorisation is needed in cases such as near watercourses, wetlands or at-risk aquifers. Ask the authority first.
Does it matter which basin I am in?
Yes. The rules come from the national water law, but each basin authority applies them through its own instructions and hydrological plan, and distances between wells differ. The guidance we read is from the Ebro basin only.
What if the well exists but is not registered?
The Ebro guidance treats regularising an existing borehole as registration when the conditions hold, otherwise a concession. Failing that, refusal, closure and fines are possible, so get legal advice before completion.
Sources
- Confederación Hidrográfica del Ebro: Instrucciones generales para aguas subterráneas (2023 version 3) (official source, opens in a new window), Art. 54.2 wells: volume, registration, distancesLast checked 18 October 2026
Legal note. How the process works in general. It is not legal advice, and it never replaces an independent Spanish lawyer acting for you.