Vallauris: Clay Soil, Subsidence and Cracks – Official Data

Forty years of decrees: the complete timeline of Vallauris

Each line = an event recognised by a prefectoral decree published in the Journal officiel (GASPAR database):

• 🔵 11/1982 → 11/1982 – Cyclones / Storms (decree of 15/12/1982)
• 🔵 10/1987 → 10/1987 – Floods (decree of 02/12/1987)
• 🔵 10/1993 → 10/1993 – Floods (decree of 19/10/1993)
• 🔵 01/1996 → 01/1996 – Floods (decree of 02/02/1996)
• 🔵 12/1996 → 12/1996 – Floods (decree of 24/03/1997)
• 🔵 10/1999 → 10/1999 – Floods (decree of 03/03/2000)
• 🔵 11/2000 → 11/2000 – Floods (decree of 19/12/2000)
• 🔴 07/2003 → 09/2003 – Drought (RGA – clay shrink-swell) (decree of 27/05/2005)
• 🔵 08/2004 – Floods (decree of 11/01/2005)
• 🔵 09/2005 → 09/2005 – Floods (decree of 16/12/2005)
• 🔴 07/2007 → 09/2007 – Drought (RGA – clay shrink-swell) (decree of 07/08/2008)
• 🔵 09/2009 – Floods (decree of 10/11/2009)
• 🔵 10/2010 → 11/2010 – Floods (decree of 30/03/2011)
• 🔵 11/2011 → 11/2011 – Floods (decree of 18/11/2011)
• 🔵 10/2012 – Floods (decree of 10/01/2013)
• 🔵 11/2014 → 11/2014 – Floods (decree of 29/12/2014)
• 🔵 11/2014 → 11/2014 – Floods (decree of 17/02/2015)
• 🔵 10/2015 – Floods (decree of 07/10/2015)
• 🔵 11/2019 → 11/2019 – Floods (decree of 28/11/2019)
• 🔵 12/2019 → 12/2019 – Floods (decree of 12/12/2019)
• 🔴 04/2022 → 09/2022 – Drought (RGA – clay shrink-swell) (decree of 03/04/2023)
• 🔵 09/2024 – Floods (decree of 15/12/2024)

How an expert reads this: 3 droughts and 19 floods. Clusters (several decrees close together) mark crisis periods – the summer sequence of 2022-2023 is the best recent example. An owner whose damage dates from a covered period has a solid Cat Nat file; outside a covered period, the route is a claim against the seller.

The official clay zoning (GéoRisques/BRGM)

The GéoRisques platform (BRGM) classifies Vallauris as high exposure to clay shrink-swell (RGA – retrait-gonflement des argiles), with some sectors at medium exposure. This is the reference level used by insurers and notaires to assess the risk on a plot. Note also: radon potential of class 3 in the commune (IRSN/GéoRisques data) – a health-and-building watch point in the areas concerned.

This zoning completes the decree record above: the hazard level tells you what can happen, the decrees tell you what has already happened. A house in a “high exposure” area that has been through one or more dry summers carries a risk of damage that is all the better documented.

What the official clay mapping says

The GéoRisques platform (BRGM) classifies Vallauris as high exposure to clay shrink-swell, with some sectors at medium exposure. This is the reference level used by insurers and notaires to assess the risk on a plot. Note also: radon potential of class 3 in the commune (IRSN/GéoRisques data) – a health-and-building watch point in the areas concerned.

This zoning completes the decree record above: the hazard level tells you what can happen, the decrees tell you what has already happened. A house in a “high exposure” area that has been through one or more dry summers carries a risk of damage that is all the better documented.

What 35 years of local rainfall tell us

Weather archives for the area cover 35 complete years (1991-2025). The driest ever recorded: 2017, with 475 mm of rain over the year, against a local average of 908 mm. 2022 ranks as the 3rd driest year out of 35 (600 mm vs a 908 mm average); 2023 follows in 4th place (635 mm).

This ranking gives the true measure of the recent sequence: when the years 2020-2023 all sit near the top of the dry-years table, the clay has had no time to rehydrate between episodes – the textbook scenario for delayed cracking. The reverse is just as telling: a very wet year following an exceptional drought triggers abrupt swelling of the ground.

Damp, water ingress and rising damp in Vallauris

Damp in a wall can have four causes – rising damp, water ingress, condensation or a leak – and the treatments are completely different depending on the origin.

An owner contacts us with a damp problem on a property in Vallauris. They have probably already seen adverts promising resin injections or a mechanical ventilation system as a miracle cure. Our message is clear: not so fast. Before any treatment, the real cause has to be identified – otherwise you risk spending several thousand euros for nothing.

The 4 causes and how to recognise them

• Rising damp: marks climbing from the base of walls, efflorescence (saltpetre), deterioration of the lower render, often in the older houses of Vallauris with no damp-proof course.
• Water ingress: localised marks linked to a degraded façade, roof or terrace, often after rain, with a tide mark that spreads.
• Condensation: misted windows, mould in corners and poorly ventilated bathrooms, typical of homes that are badly insulated or lack working ventilation.
• Leak: a one-off mark near a pipe, a shower room or a kitchen, that evolves independently of the weather.

The trap of the diagnosis sold by the treatment contractor

Most companies offering a “free damp diagnosis” are in fact selling their own solution behind it. The diagnosis is never neutral: it is designed to justify selling injections, tanking or a ventilation system, whether suitable or not. The result: owners in Vallauris who have paid for heavy treatments without the damp ever disappearing, simply because the real cause was not the one treated.

Before committing to works, it is wiser to have an independent damp survey in Vallauris, with no commercial ties to a treatment company. To understand in detail the mechanisms and the solutions suited to each case, read the damp guide for the 06, 83 and 13.

What defines Vallauris from a building survey perspective

We know Vallauris well, having carried out many crack diagnosis projects there, and the relief plays a decisive role: the commune steps down from the perched old village to the seafront at Golfe-Juan, through residential neighbourhoods built on the hillside such as the heights of Super Cannes or towards La Frayère. This sloping topography produces heterogeneous ground where local clays and marls alternate with pockets of fill, especially in the 1970s-80s estates built quickly during the Côte d’Azur property boom, often with shallow foundations poorly suited to the nature of the soil. We regularly see Provençal villas and individual houses with façade cracks that appear after scorching summers, when the clay shrinks sharply in dry spells before swelling again with the first autumn rains: this cycle of differential settlement gradually weakens structures, particularly where the surrounding vegetation – maritime pines and oaks with deep, thirsty roots – dries the ground out further right next to the foundations. Renovations and extensions carried out on this older stock, sometimes without a preliminary soil survey, make the phenomenon worse still, which is why Vallauris remains a commune where we systematically recommend particular vigilance over the state of the foundations.

Vallauris: drought, clay and cracks – what the official figures say

Is my cracked house in Vallauris linked to drought? Probably yes if it was built on clay: the GASPAR database lists 3 drought decrees (full list below) and 19 flood decrees, i.e. 22 decrees on record. Local rainfall tells the same story: four deficit years in a row (2020 to 2023), then a rebound to 1,239 mm in 2024 – exactly the scenario that puts foundations to work in the potters’ town.

Cassini Expertise, an independent building expert, handles cracks and drought-related damage in Vallauris and throughout the 06. This page brings together the official data for the commune and tells you, for each item, what to do with it in practice.

How many natural disaster decrees have affected Vallauris?

According to the GASPAR database (decrees published in the Journal officiel since 1982), Vallauris has recorded a total of 22 natural disaster (Cat Nat) decrees:

• 3 drought decrees (differential ground movement linked to clay shrink-swell)
  • event of 01/07/2003 (decree of 27/05/2005)
  • event of 01/07/2007 (decree of 07/08/2008)
  • event of 01/04/2022 (decree of 03/04/2023)
• 19 flood decrees and storm

What to take from this if you have cracks: each decree corresponds to a clearly defined period. Compare the date your cracks appeared with these three periods (2003, 2007, 2022). If they coincide and you declared the claim within 30 days of the decree, Cat Nat compensation is on the cards. Otherwise, the remaining route is the claim against the seller for hidden defect (vice caché) or fraudulent concealment (dol) – see below.

Is Vallauris in a clay zone? What the official mapping says

The GéoRisques platform (BRGM) classifies Vallauris as high exposure to clay shrink-swell, with some sectors at medium exposure. This is the reference level used by insurers and notaires to assess the risk on a plot – check it yourself on georisques.gouv.fr by entering your address, before buying or starting foundation works. Note also: radon potential of class 3 in the commune (IRSN/GéoRisques data), a health-and-building watch point if your home is in an affected area – a low-cost radon measurement is enough to check.

This zoning completes the decree record above: the hazard level tells you what can happen, the decrees tell you what has already happened. A house in a “high exposure” area that has been through one or more dry summers carries a risk of damage that is all the better documented – the typical profile of the houses we are asked to survey.

Local rainfall: why cracks appear with a delay

Annual rainfall recorded on the Vallauris weather grid (Open-Meteo data):

• 2019: 1,167 mm · 2020: 679 mm · 2021: 639 mm · 2022: 600 mm · 2023: 635 mm · 2024: 1,239 mm
• Average over the period: 826 mm/year, record drought year: 2022 (600 mm)
• Four years below the average in a row: 679 mm in 2020, 639 mm in 2021, 600 mm in 2022, 635 mm in 2023
• Then in 2024, a sharp return to 1,239 mm, +50% against the average

Clay shrink-swell plays out in two acts: first the drought dries the clay at depth, the ground shrinks and the first cracks appear; then the rain returns, the ground rehydrates at once and swells, triggering fresh differential movement. Houses built on shallow foundations – the great majority of 1970s-2000 villas – take the first damage, often 12 to 24 months after the weather event concerned. In practical terms: a crack appearing today may well originate in the 2022 drought, not in this year’s rain.

Cracks in Vallauris: when to really start worrying

• A stair-step crack, passing through the wall, wider than 2 mm
• A crack that evolves over time: fit a tell-tale (a simple plaster strip or a store-bought crack gauge) and check it again after several months
• Other signals to watch: doors and windows that stick, floor tiles splitting diagonally, render that bulges
• Aggravating factors on your plot: clay ground, trees close to the house, drainage in poor condition

With 3 drought decrees already recognised in the commune, as soon as several of these signals build up at your home, do not start filling cracks before the house has been surveyed – and if you are in the middle of a purchase or a sale, now is the time to raise it, not after signing.

Buying or selling a cracked house in Vallauris: what the law says

With the recent drought decrees and the volume of transactions under way, plenty of properties change owner with damage passed over in silence. If you discover cracks after buying, you have two levers:

• Hidden defect (vice caché, Article 1641 of the French Civil Code): serious cracks, not detectable at the viewing, predating the sale → price reduction or cancellation of the sale. You have 2 years from discovery to act.
• Fraudulent concealment (dol, Article 1137): the seller knew and said nothing → cancellation plus damages. You have 5 years to act; the commune’s GASPAR decree record then supports the file by proving the seller could not have been unaware of the risk.

First step before any proceedings: have the damage dated and costed by an independent expert, then consult a French property lawyer to choose between the two routes.

How a drought/clay survey works in Vallauris

If you call us, here is what we actually do:

• On-site visit: crack mapping and classification, width measurements, associated functional disorders
• Context: the clayey nature of the ground, the commune’s Cat Nat history (3 drought decrees), local drought episodes
• Costing of works: underpinning, injections, drainage – several costed scenarios depending on your budget and the real urgency
• A written report, directly usable by the insurer or the lawyer

For an on-site visit: building expert in Vallauris.

Independent expert, no ties to any repair company. Request a visit in Vallauris – also read our complete RGA and Cat Nat guide for the 06, 83 and 13.

Soil surveys on clay ground: what the regulations say

The requirement for a preliminary geotechnical survey has applied since 1 October 2020 (ELAN law, art. 68); the new exposure map of 1 July 2026 widens its scope. This requirement, introduced by the ELAN law no. 2018-1021, article 68 (decree no. 2019-495 of 22 May 2019), applies particularly to Vallauris (high exposure under the BRGM classification).

• What it changes for building: a soil survey is no longer optional – the ELAN law makes it compulsory in exposed zones for any sale of unbuilt land and any construction contract. Adapted foundations, ground treatment, drainage arrangements: the specifications flow directly from the survey.
• What it changes when buying a recent property: ask whether the survey was carried out and which specifications were applied. A house built without following the geotechnical recommendations on clay ground is a medium-term cracking risk.
• What it changes for sellers: the absence of a survey on a property built before the requirement is not a defect in itself – but if damage appears, a seller who knew about it and concealed it exposes themselves to a claim for fraudulent concealment (dol).
• The link with the data above: Vallauris combines high exposure with a documented record of drought decrees. Building or buying here without checking the nature of the ground means building on a known and measured risk.

Cassini Expertise handles these files: compliance checks between geotechnical specifications and what was actually built, damage surveys on clay ground, counter-surveys. Request a consultation.

Frequently asked questions

Is Vallauris among the clay risk zones?

Yes. The Alpes-Maritimes is very widely affected by the clay shrink-swell hazard (BRGM mapping, consultable on georisques.gouv.fr). In Vallauris, the 3 drought decrees recorded in GASPAR confirm that the risk is anything but theoretical: check your exact plot on the map before buying or starting foundation works.

Can a cracked house in Vallauris be compensated under natural disaster provisions?

Only if the damage falls within a period covered by a decree (the last recognised: 2005, 2008, 2023) and if the declaration was made within 30 days of the decree being published. Failing that, the action against the seller for hidden defect or fraudulent concealment remains – and there, precisely dating the damage by survey becomes the central issue of your file.

Where do the figures quoted on this page come from?

From decrees in the GASPAR database (Journal officiel, open data, updated 2025), and from rainfall taken from the Open-Meteo archives for the Vallauris grid. Cassini Expertise reproduces this data as it stands, without altering it.

Where do rainfall stands? (as at 05/10/2026)

In the commune: recent rain (4 days ago). Rainfall over the last 30 days: 2 mm, against roughly 59 mm expected at this time of year – a 97% deficit.

A sustained deficit over this window, especially during the growing season, often precedes by a few weeks the drop in the water table visible above: it is the first signal owners can track themselves, before any cracks appear.

Weekly drought update (as at 12/10/2026)

In the commune: recent rain (4 days ago). Rainfall over the last 30 days: 61 mm, against roughly 69 mm expected at this time of year – a 12% deficit.

A sustained deficit over this window, especially during the growing season, often precedes by a few weeks the drop in the water table visible above: it is the first signal owners can track themselves, before any cracks appear.

Rainfall today: where do we stand? (as at 19/10/2026)

In the commune: recent rain (1 day ago). Rainfall over the last 30 days: 82 mm, against roughly 80 mm expected at this time of year – a 2% surplus.

A sustained deficit over this window, especially during the growing season, often precedes by a few weeks the drop in the water table visible above: it is the first signal owners can track themselves, before any cracks appear.

When was the water table last this low?

The reference piezometric station for the area (002FFSZ) has been monitoring the water table since 1997 – 30 years of records. As at 26/09/2026, the average level over the last thirty days is 70.81 m NGF (NGF, the French ordnance datum). Across the entire record, the water table has spent only 24.0% of its time below this level: a low level, in the lower quartile of known values.

• Last comparable episode: 30/10/2023 – 2.9 years ago
• Frequency: 19 similar episodes recorded since 1997, i.e. a return period of once every 2 years on average – in hydrologists’ terms, an intermediate episode
• Historical minimum: 65.58 m NGF, reached on 24/10/2022

This long memory changes how the risk should be read: a low level is not just a passing weather episode, it is an event whose frequency is known. For a house on clay, it is this frequency that tells you the probability of further settlement – and therefore how urgent the precautions are.

Find out more: Article 1641 of the Civil Code and the hidden defects warranty (garantie des vices cachés), explained.

Survey carried out by Frédéric Faucouneau, independent building expert – Antibes, Alpes-Maritimes (06), Var (83), Bouches-du-Rhône (13). Find out more

📅 Last updated 06/11/2026 - Cassini Expertise, independent building expert – departments 06, 83 and 13.