Drought: French groundwater is being depleted due to the intense heat.

After a relatively favorable start to the year thanks to satisfactory winter recharge, the hydrological situation in France has rapidly deteriorated. According to the French Geological Survey (BRGM), 93% of groundwater levels are now declining, a consequence of insufficient rainfall, periods of intense heat, and increased water withdrawals. This phenomenon affects almost the entire country and is reminiscent of recent major droughts, although the situation still varies from region to region.

A rapid deterioration since June

The decline in groundwater reserves has accelerated with the rainfall deficit observed over the past several weeks and the successive heat waves. The BRGM explains this "depletion of aquifers" by a combination of factors: increasingly dry soils, significant evaporation linked to high temperatures, and growing water needs, particularly for agriculture.

As of July 1, 2026, more than half of the monitoring points showed levels below seasonal norms. The contrast with previous months is striking: at the end of May, the situation was still generally more favorable, before June caused a rapid drop in available reserves.

However, some areas remain better protected. In the Île-de-France region, the Eure-et-Loir department, the Roussillon plain, and certain aquifers in the Sarthe department, groundwater levels remain "moderately high" to "very high," according to the BRGM (French Geological Survey). These areas could maintain a satisfactory situation in the coming months if rainfall returns.

Conversely, several regions are already experiencing significant pressure on groundwater levels. The Massif Central, Auvergne, Limousin, and parts of the Grand Est region have levels considered "very low" and are subject to heightened monitoring. In these areas, groundwater reserves are particularly vulnerable to prolonged periods without rain.

Water restrictions and concerns for agriculture

Faced with this situation, the authorities have begun to restrict water usage. According to the Ministry for Ecological Transition, 97 departments have already taken measures to reduce withdrawals in order to preserve the resource. Several dozen areas are under drought alert or crisis status, with restrictions potentially affecting irrigation, certain domestic uses, and economic activities.

This early drought is causing particular concern in the agricultural sector. High temperatures have exacerbated water stress on crops and could lead to significant yield losses. In an interview with France 24, hydrologist Yves Tramblay, research director at the French Research Institute for Development (IRD), believes that current conditions could have significant consequences for some farms, especially after several episodes of extreme heat.

The expert also points out that droughts are becoming more frequent and intense with climate change. According to him, adaptation will require, in particular, an evolution of agricultural practices, better soil management, and a focus on crops adapted to the new climatic conditions.

Uncertainty remains for the coming months. The return of regular rainfall could slow the decline in groundwater levels by rehydrating the soil and reducing the need for extraction. However, after an exceptionally hot start to the summer, French groundwater reserves are approaching the rest of the season with a reduced safety margin.