Tap water warmer than usual? It might be through the end of summer. As part of regular operations, the City is blending wells with surface water supplies. Groundwater, especially in East Mesa, is naturally warm. Combined with increasing spring and summer temperatures this can make for much warmer water coming out of your tap. Your water is still safe to drink and use in everyday activities. Questions? Contact our Water Quality Division at 480-644-6461 or water.quality@mesaaz.gov.