Well Water Supply on Costa Blanca Villas: What to Check

Well Water Supply on Costa Blanca Villas: What to Check Before You Buy

Many buyers arrive on the Costa Blanca expecting every property to sit neatly on the mains grid. That assumption works well enough for a flat in central Jávea or a townhouse in Moraira's old quarter. For a hillside villa with a pool on the Montgó slopes, an inland finca in the Jalón Valley, or a spread-out urbanisation above Benissa Costa, the reality is often more nuanced — and ignoring it can lead to costly surprises after completion.

This guide explains the difference between mains and private well supply, how water rights should appear in your deeds, what pressure issues to look for on hillside properties, and the inspection points your solicitor and surveyor should cover.

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Mains Supply vs Private Well: The Basics

In Jávea, the municipal water company AMJASA supplies most urbanisations with treated mains water drawn from a combination of local wells and a desalination plant. Similar arrangements operate in Dénia (FACSA) and across most municipalities in Marina Alta.

But not every property connects to the mains. In more rural or dispersed urbanisations — particularly inland in the Jalón and Orba valleys, on the higher slopes of Montgó, or on hillside plots in Benissa Costa — a property may rely partly or entirely on a private well (pozo privado). Some villas run a hybrid: mains water for drinking and cooking, well water for the pool and garden irrigation. That is practical and common, but it carries its own set of checks.

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How Water Law Works in Spain

Under Spain's Water Law (Ley 29/1985, consolidated as Real Decreto Legislativo 1/2001), all groundwater is public domain. You cannot own the water beneath your villa — but you can hold the legal right to extract it, granted by the Confederación Hidrográfica del Júcar (CHJ), the basin authority for Alicante and Valencia provinces.

Any well drawing water for domestic or irrigation use needs either a CHJ concession (concesión) or, for smaller domestic volumes, a declaración responsable. Wells predating 1986 may have been inscribed in the Registro de Aguas or the Catálogo de Aguas Privadas during a now-closed registration window. Regardless of when a well was dug, the extraction right must be current and verifiable.

The key point for buyers: it is the right to extract water that matters, not simply the physical presence of a well on the plot.

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Water Rights and Your Deeds

A properly documented well should appear in two places: the escritura de compraventa (the notarised deed of sale) and the CHJ's water register. The escritura should reference the pozo, its depth, and the registered extraction right. The CHJ records the concession number, the permitted annual volume, and the renewal date.

In practice, many older rural properties have wells that exist on the ground but are not properly reflected in the escritura or the CHJ register. Without a registered right, there is no certainty that you are entitled to continue extracting water after purchase, and the CHJ can require compliance or decline to renew the right on existing terms.

Before signing any purchase contract, ask your Spanish lawyer to:

• Check the nota simple from the Registro de la Propiedad for any mention of the well;
• Request the CHJ concession document and verify it is valid and transferable;
• Confirm the permitted annual volume matches the property's practical needs.

If the well is undocumented, your lawyer can advise on whether regularisation with the CHJ is feasible before you exchange contracts — and at whose cost.

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Pressure Problems on Hillside and Inland Villas

Even where a villa connects to the mains, elevation can work against you. Mains pressure in dispersed hillside urbanisations tends to drop below comfortable domestic levels in summer, when seasonal demand peaks and longer pipe runs lose pressure over distance.

Signs to look for during a viewing:

• Run taps simultaneously on different floors. A notable drop in flow upstairs points to low inlet pressure or an absent pressurisation pump.
• Check whether the property has an accumulator (depósito or calderín) or a booster pump (bomba de presión). These are common, inexpensive to run, and easy to maintain — but confirm they are present and working.
• Look for a storage tank (cisterna). Some hillside homes store mains or well water in a gravity tank and pump it around the house from there. Ask whether it is gravity-fed or pressurised, and inspect the tank for sediment or corrosion.

For a well-fed property, the submersible pump (bomba sumergible) deserves its own inspection. Ask when it was last serviced, check for rust or weeping joints at the pump head, and run the pump for several minutes to confirm consistent flow and pressure.

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Water Quality: Always Test Before You Complete

Well water is not automatically safe to drink. In inland agricultural areas such as the Jalón and Orba valleys, nitrate contamination from decades of irrigation farming is a known concern. Near the coast, older aquifers may show elevated salinity from seawater intrusion into the water table.

Commission an independent water quality analysis from a certified laboratory (laboratorio acreditado) before completion. A standard domestic test — covering bacteria, nitrates, pH, hardness, and basic chemical parameters — costs roughly €80–120. If the result flags elevated nitrates or bacterial contamination, factor a filtration or treatment system into your budget and use it as a negotiating point with the vendor.

Even if the seller assures you the water is fine, your own analysis provides objective evidence and protects you after the keys change hands.

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Inspection Checklist at a Glance

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Where Private or Mixed Supply Is Most Common

Private or partially independent water supply is particularly worth investigating in:

• Jalón and Orba valleys — rural fincas and older cortijos on rustic land frequently rely on wells, sometimes shared between several plots;
• Montgó slopes (between Jávea and Dénia) — higher-elevation plots and dispersed urbanisations can have weaker mains pressure during peak summer;
• Benissa Costa hillside urbanisations — some older developments above Baladrar and Fanadix;
• Inland villages and surrounding farmland — Parcent, Senija, Tàrbena, and similar communities.

None of this is a reason to avoid these areas. Inland and hillside properties often offer exceptional value, generous plots, and the kind of privacy that is simply impossible closer to the coast. Understanding the water supply means you can factor it properly into your purchase checks, negotiate from an informed position, and budget accurately for ongoing costs. With the right legal and technical due diligence, a villa on a private or mixed supply can be just as reliable as one on the full mains grid.

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Frequently asked questions

How do I find out whether a Costa Blanca villa is on mains or private well supply?

Ask the selling agent directly. Then ask your Spanish lawyer to check the escritura and request the CHJ concession documentation. A property surveyor can also trace the incoming supply visually during inspection.

Do water rights have to appear in the property deeds?

They should. A properly regularised well should be referenced in the escritura and registered with the Confederación Hidrográfica del Júcar. An unregistered or undocumented well is a legal uncertainty the buyer inherits, and your solicitor should flag it before you exchange.

What is the Confederación Hidrográfica del Júcar?

The CHJ is Spain's basin authority for Alicante and Valencia provinces. All groundwater extraction rights on the Costa Blanca North fall under its remit. A valid CHJ concession or declaración responsable is what gives you the legal right to use a well on a property you purchase.

What pressure problems should I expect on a hillside villa?

Mains pressure can be low at elevation, particularly in summer. Most hillside villas compensate with a booster pump or accumulator tank. Check these are present, in working order, and correctly sized during your viewing.

Is well water safe to drink on the Costa Blanca?

It depends on the source and location. Some wells deliver clean, potable water; others may show elevated nitrates in inland agricultural zones or salinity near the coast. Always commission an independent water quality test from a certified laboratory before completing the purchase.

How much does a private well cost to maintain?

Routine maintenance — pump servicing, an annual water quality test, and minor repairs — typically runs €300–600 per year for a standard domestic well. A full pump replacement, if needed, costs roughly €800–2,000 depending on depth and pump type.