In the summer of 2026, most French départements (counties) are once again under drought restrictions, and the English-language press has taken notice: Connexion France recently ran a practical guide to the 2026 rules on swimming pools, well water and rainwater use. Behind those practical rules sits a body of French law that most anglophone buyers only discover when a dispute begins: the water under their land, the spring on their plot, the ditch at the bottom of the garden, and the prefectural decree that forbids filling the pool. French law treats water in two ways at once. It is a private asset attached to the soil, governed by the Civil Code and by centuries of case law. It is also a shared public resource that the State can restrict, under the Environment Code, the public health rules and the local-government statutes. This article sets out both layers from primary sources only: the Civil Code, three administrative codes, and nine decisions of the third civil chamber of the Cour de cassation handed down between 2023 and 2026, each with its official link. If you are buying, renovating or simply owning property in France, this is the water law that follows the land, and it survives any change of owner.

I. Water as Property: Wells, Springs and the Ground Beneath Your French Home

A. What the Civil Code Gives You: The Well, the Spring and the Subsoil

The starting point is Article 552 of the French Civil Code, which makes ownership of the soil carry with it everything above and below. The Cour de cassation regularly restates the rule in its own words, as it did in a decision published in its Bulletin on 13 April 2023: «la propriété du sol emporte la propriété du dessus et du dessous» — ownership of the soil carries ownership of what is above and what is below it (Cass. 3e civ., 13 April 2023, no. 22-10.487). Translated into water terms: the groundwater beneath your plot, the well you sink into it and the spring that rises on it are, in principle, yours, as accessories of the land you bought.

The Civil Code then organises this private ownership in three consecutive articles. Article 641 opens with the clearest formulation: «Tout propriétaire a le droit d’user et de disposer des eaux pluviales qui tombent sur son fonds» — every owner has the right to use and dispose of the rainwater that falls on his land. The same provision treats waters from springs born on the land in the same way, while adding a price tag: if the way you use that water, or the direction you give it, aggravates the natural drainage servitude owed to the lower-lying neighbour under Article 640, you owe that neighbour compensation. Article 642 then grants the owner of a spring broad freedom: «Celui qui a une source dans son fonds peut toujours user des eaux à sa volonté dans les limites et pour les besoins de son héritage» — whoever has a spring on his land may always use its waters as he wishes, within the limits and for the needs of his estate. That freedom is not absolute. The same article protects lower-lying neighbours who have, for more than thirty years, built and completed visible and permanent works to use the waters or to facilitate their passage across their own land: you cannot then use the spring to their prejudice. Nor can you use it so as to deprive the inhabitants of a commune, village or hamlet of the water they need.

What the third civil chamber has been doing since 2023 is applying these old rules to modern disputes, and the results are directly relevant to foreign buyers. In a decision of 10 April 2025, the Court had to decide whether neighbours on whose land a spring emerged, and who had installed a capture device in a manhole to make the water rise to the surface, could lawfully keep water that fed a basin on the claimant’s adjoining plot through a pipe. The Court approved the appeal court’s conclusion that «M. et Mme [L] disposaient de droits sur cette eau présente dans le sous-sol de leur fonds» — the neighbours had rights over the water present in the subsoil of their own land (Cass. 3e civ., 10 April 2025, no. 22-21.287). The reasoning is subtle and worth understanding: the device was installed upstream of the pipe that served the servitude, meaning the neighbours were drawing on their own groundwater, not intercepting water that already belonged to the servitude. For a buyer, the lesson is that the water in the ground follows the land, and that a pipe, a manhole or a capture system that has always been there may not entitle the neighbour to anything more than the deed says.

The opposite lesson, and perhaps the more important one for anyone buying a rural property with a spring, comes from a decision of 18 June 2026. A commune had no title to a spring situated on a landowner’s plot, but «elle justifiait avoir réalisé, depuis 1936, des travaux de captation et de construction de divers ouvrages additionnels à l’endroit où la source jaillissait et qu’elle les avait entretenus» — it had, since 1936, carried out capture works and built various additional structures at the point where the spring emerged, and had maintained them (Cass. 3e civ., 18 June 2026, no. 25-10.567). The Court held that those visible, unequivocal acts of possession, carried out for more than thirty years in full view of everyone — and acknowledged by the landowner himself in correspondence — had transferred ownership of the emergence point and of the works to the commune, without any need to rely on Article 642. The practical consequence: before you buy a property with a spring, walk the land and read the correspondence. If a commune, a neighbour or a syndicat (water users’ association) has built and maintained capture works for decades, the spring may no longer be yours, whatever the deed says.

B. Where Private Rights Stop: Public Waters, Declarations and Protection Perimeters

Private ownership of water stops where the general interest begins, and the first boundary is drawn by Article 643 of the Civil Code. The third civil chamber recited it in a published decision of 26 September 2024: «si, dès la sortie du fonds où elles surgissent, les eaux de source forment un cours d’eau offrant le caractère d’eaux publiques et courantes, le propriétaire ne peut les détourner de leur cours naturel au préjudice des usagers inférieurs» — if, immediately upon leaving the land where they emerge, spring waters form a watercourse having the character of public flowing waters, the owner may not divert them from their natural course to the detriment of downstream users (Cass. 3e civ., 26 September 2024, no. 22-19.915). In that case the court of appeal had found, based on photographs and an expert report, that the springs at the source area produced only several scattered trickles, with no identifiable bed or flow level that would give them the character of a public watercourse; the Court approved the conclusion that Article 643 did not apply. The test is factual: a genuine watercourse with a bed and a sufficient flow takes the water out of your private patrimony, while a mere trickle on your land does not.

The second boundary is administrative and catches far more foreign owners than the first. Article L. 2224-9 of the General Code of Local Authorities provides that «Tout prélèvement, puits ou forage réalisé à des fins d’usage domestique de l’eau fait l’objet d’une déclaration auprès du maire de la commune concernée» — every abstraction, well or borehole made for domestic water use must be declared to the mayor of the commune concerned. The drilling company must be certified and must make the declaration on the client’s behalf within three months of completing the works; companies that drill without certification face an administrative fine of up to 15,000 euros per works. The same article requires a declaration for any indoor rainwater system in a building connected to the public mains — a common installation in renovated French houses where rainwater feeds toilets, floor-washing points or washing machines. For a buyer this is a due-diligence point, not a formality: when you purchase, ask the seller for the well declaration, and if the well is old and was never declared, regularise it through the mairie (town hall). An undeclared well is a compliance problem that will surface on sale, during renovation or, most likely, at the moment you ask your insurer to cover the property.

The third boundary concerns everyone whose land lies near a public drinking-water catchment. Under Article L. 1321-2 of the Public Health Code, the declaration of public utility for a drinking-water abstraction defines a protection perimeter around the intake point. The immediate perimeter’s land is acquired outright by the public authority; within the close protection perimeter (périmètre de protection rapprochée), all kinds of installations, works and activities that could harm water quality can be prohibited or regulated, and compensation can be owed to the owners and occupiers affected. The third civil chamber clarified the regime in a published decision of 11 September 2025: «l’instauration d’un périmètre de protection rapprochée n’emportant pas automatiquement, à la différence d’un périmètre de protection immédiate, l’inconstructibilité des parcelles concernées» — unlike the immediate perimeter, the close protection perimeter does not automatically make the land unbuildable (Cass. 3e civ., 11 September 2025, no. 23-14.398). The same decision fixed the starting point of the four-year limitation period for compensation claims at the first day of the year following the one in which the owners knew or should have known of the restrictions affecting their land — a rule that can rescue claims that look old. For a foreign buyer, the perimeter question is one to ask the mairie and the regional health agency before signing: a plot inside a close perimeter may be buildable, but only subject to constraints that the agent’s brochure will not mention, from banned septic tanks to regulated storage of fuel or chemicals.

II. Water as a Shared Burden: Drainage Duties, Drought Orders and Liability

A. Rainwater, Runoff and the Neighbour’s Ditch: The Natural Drainage Servitude

French law has organised the flow of water between neighbouring plots since 1804. Article 640 of the Civil Code creates a legal servitude, requiring no deed and no agreement: lower-lying land must receive the waters that flow from higher land naturally, without any human contribution. The provision then binds both sides: «Le propriétaire supérieur ne peut rien faire qui aggrave la servitude du fonds inférieur» — the higher owner may do nothing that aggravates the servitude of the lower land. This single sentence governs most garden, terrace and driveway disputes in France. The lower neighbour may not build a dam that blocks the natural flow, and the higher neighbour may not worsen that flow by his own acts: channelling water onto the slope below, diverting gutters, paving a large area so that runoff concentrates, or building a terrace that pushes water toward the boundary are all classic aggravations. Article 641 of the Civil Code closes the loop: when drilling or underground works make water rise on your land, the lower neighbours must receive it, but they are entitled to compensation for the resulting damage. The right to drain is thus never a right to damage.

Recent case law shows how fragile informal drainage arrangements can be. In a decision of 15 January 2026, the third civil chamber quashed a judgment that had ordered a company to stop discharging its wastewater into a pipe crossing a neighbour’s land (Cass. 3e civ., 15 January 2026, no. 24-19.324). The appeal court had found that the discharging plot was not landlocked, since it had access to the public road where the mains sewer ran, and that connection works, though costly, were not impossible. The Court of cassation censured the decision for a procedural but revealing reason: the appeal court had never answered the company’s argument that «le coût des travaux à sa charge pour raccorder au réseau public d’assainissement l’évacuation des eaux usées provenant de son fonds serait disproportionné par rapport à la valeur de celui-ci» — the cost of connecting its wastewater to the public sewer network would be disproportionate to the value of its property. The case illustrates the two truths that matter to a foreign buyer. First, discharging across a neighbour’s land rests on some legal basis — a servitude recorded in a deed, a thirty-year practice, or nothing at all — and when the basis fails, the discharge can be ordered to stop. Second, a court cannot simply ignore proportionality; but it can hold against you if your plot genuinely has a lawful connection alternative. When you buy, ask where every pipe goes, and look for the titre (title deed) that justifies any pipe crossing a neighbour’s plot; a handshake arrangement with the previous owner binds no one.

The same logic applies before you build. Extending a roof, adding a carport, concreting a courtyard or re-landscaping a slope changes the hydrology of your plot, and under Article 640 the lower neighbour can claim against you for the aggravation. The prudent sequence for a foreign owner is therefore to have the drainage paths identified before works begin, and to keep the works from concentrating runoff toward the boundary. Where the water genuinely cannot flow otherwise, the remedy is not improvisation but a servitude — agreed in writing, recorded in the deed, and binding on future owners.

B. Drought Orders, Leaks and Damage: What You Must Accept, and What You Can Claim

The public side of water law bites hardest in summer. Article L. 211-3 of the Environment Code authorises the administrative authority to «Prendre des mesures de limitation ou de suspension provisoire des usages de l’eau, pour faire face à une menace ou aux conséquences d’accidents, de sécheresse, d’inondations ou à un risque de pénurie» — to take measures limiting or temporarily suspending water uses, to face a threat or the consequences of accidents, drought, floods or a risk of shortage. In practice, in each drought episode the préfet (the State’s representative in the département) issues an arrêté préfectoral — a prefectural decree — that restricts water uses zone by zone: filling and topping up swimming pools, watering gardens and lawns, washing cars, and sometimes any non-essential domestic use. The restrictions escalate by level, from light limits to outright bans, and they apply to every property in the zone, whether or not the owner is resident in France. Being abroad when the decree is issued is not a defence, and violations are punishable. The only reliable reading is the decree itself, published on the préfecture‘s website and displayed at the mairie: before you instruct a property manager to fill the pool in July, have them check the decree in force that week. The law gives the State no obligation to warn you personally.

When water causes damage instead of shortage, French law draws a sharp line that most foreign owners get wrong. The third civil chamber drew it again in a published decision of 4 September 2025: «le dommage causé par la fuite survenue sur une canalisation de distribution d’eau potable, située en amont d’un compteur individuel et sur la propriété desservie, se rattache à l’exécution des obligations de l’exploitant d’un service public industriel et commercial et de celles de l’usager, définies par le règlement de service» — damage caused by a leak on a drinking-water distribution pipe located upstream of an individual meter, on the property served, is attached to the performance of the obligations of the operator of the public service and of the user, as defined in the service regulations (Cass. 3e civ., 4 September 2025, no. 24-17.470). The consequence, grounded in Article L. 2224-12 of the General Code of Local Authorities, is that the claim against the water company for a leak upstream of the meter proceeds on contractual liability, before the courts, not on the administrative no-fault regime for public works. For the owner this matters twice. Upstream of the meter, the operator’s pipe — and the operator’s responsibility — may run across your garden; the claim must be framed against the contract and the règlement de service (service regulations). Downstream of the meter, the leak is yours, in every sense: your pipe, your damage, your bill, subject only to the exclusions of your own insurance.

Damage caused by your own works is governed by ordinary civil liability, with one rule that surprises common-law buyers. In a published decision of 14 September 2023, the third civil chamber recalled that «à défaut d’accord des parties, la victime d’un dommage ne peut être indemnisée du coût de travaux devant être effectués sur un fonds dont elle n’est pas propriétaire» — absent agreement between the parties, the victim of damage cannot be compensated for the cost of works to be carried out on land she does not own (Cass. 3e civ., 14 September 2023, no. 22-15.750). The case involved earthworks carried out in 1992 that caused the neighbour’s land to collapse decades later; the appeal court had awarded the neighbour the cost of remedial works on the defendant’s own land, and the Cour de cassation quashed the award. The drafting lesson for a claim letter or a settlement is real: what you can claim is compensation for the damage to your land and possessions, not the price of works on the defendant’s side of the boundary, unless the parties agree otherwise. And when water or land stability is at stake near a risk zone, the servitude rules add a further constraint: in a published decision of 25 January 2024, the Court held that a landowner seeking to move a servitude to a different location «ne peut proposer comme nouvelle assiette qu’un endroit aussi commode et ne peut donc méconnaître les prescriptions d’un plan de prévention des risques naturels» — may only propose a place as convenient as the original, and cannot disregard the requirements of a natural-risk prevention plan (Cass. 3e civ., 25 January 2024, no. 22-16.920, applying Article 701 of the Civil Code). The same discipline applies to your own projects: if your land lies in a flood, fire or landslide prevention zone, the risk plan constrains what you may build and move, water being the usual reason the zone exists. For owners facing any of these situations, the firm’s real estate and business law practice handles disputes with neighbours, insurers and water operators in French courts.

Conclusion

Water law in France is a layered system, and each layer produces its own mistake to avoid. The Civil Code makes the subsoil, the well and the spring yours, but centuries-old capture works, thirty-year practices and public watercourses can take them away. The administrative codes require declarations — for wells, boreholes and indoor rainwater systems — and impose protection perimeters around drinking-water catchments that no brochure will show you. Between neighbours, the natural drainage servitude of Article 640 is automatic and two-sided: you must receive what flows down, and you may do nothing that worsens what flows on. In summer, the prefectural decree governs the pool and the garden, and it does not care where you live. When water damages, the meter draws the line between the operator’s contract and your insurance, and a well-drafted claim respects the boundary between your land and your neighbour’s. None of this requires a dispute to be useful: reading the deed for water rights, checking the well declaration and the protection perimeters before purchase, and reading the drought decree before each summer are the three habits that keep a French property enjoyable. Where a genuine difficulty arises, the real estate law team advises and represents foreign owners in English, from pre-purchase review to litigation before the French courts.