About 30% of the tap water supply in Costa Blanca comes from groundwater aquifers. The rest are from other regions and desalination plants. The combined supply from these two sources is enough to cater to locals and tourists in Costa Blanca. Because Costa Blanca is a coastal area, they classify as semi-arid. The rainfall is not much. And if there is, it would be irregular. There are also fewer rivers and no lakes. But during the summer months, the demand for water increases. This is because thousands of tourists visit Costa Blanca for its coastal beauty. It is in these months that Costa Blanca receives about 500,000 or so tourists. The supply of tap water in Costa Blanca is often enough, even during summer. But because tap water in Costa Blanca has an aftertaste, most tourists don’t drink it. It is common for tourists to explore other options. Bottled water is a popular alternative in Costa Blanca.