Fairfield is a city in Jefferson County, Alabama, located in the central region of the state. The climate in Fairfield is warm and humid, with hot summers and mild winters. The city is situated near the Black Warrior River, which provides a vital source of water for the area. Hydrology constituents in the area include high levels of sediment and nutrients, which can lead to water quality issues. Outdoor recreation opportunities in Fairfield include the nearby Tannehill State Park, which offers hiking, camping, and fishing opportunities. The park also hosts events throughout the year, including a Civil War reenactment and a Halloween festival.