Birmingham Water Works, founded in 1951, is one of the largest water systems in Alabama. The system has four water sources, more than 3,700-miles of transmission lines and over 450 employees. It focuses on maintaining, preserving and conserving water resources to ensure adequate water supply. Birmingham Water Works also implements the provisions of the Environmental Protection Agency. The system implements Watershed Protection Policy that limits development in areas close to water sources, which reduces pollutants. It also purchases land to increase watershed and decrease treatment required for raw water. The system is located in Birmingham, Ala.