Zephyrhills is a city in Pasco County, Florida, United States. The population was estimated at 13,288 in the 2010 census. It is a suburb of the Tampa Bay Metropolitan Statistical Area. Zephyrhills is also known as the headquarters of the Zephyrhills bottled water company and is a member of Tree City USA. The median income for a household in the city in 2005 was $33,100.