New data released by the Ministry of Environment shows that this time last year the reserves were at 48% and now they are only 36%.
Córdoba has bore the brunt of an unusually hot summer and its reservoirs are the lowest in the region at 28%.
The Guadalquivir river basin – the life blood of Andalucia is at 31% of total capacity.
The river which runs through Seville has meant that the city has had the least change to the annual average with recorded levels of 48%.
Even the best stocked basin in Andalucia – the swamps of Huelva – have decreased considerably.