The term best available technology is taken to mean the latest stage of development (state of the art) of processes, of facilities or of methods of operation which indicate the practical suitability o [..]

The best technology treatment techniques, or other means which the Administrator finds, after examination for efficacy under field conditions and not solely under laboratory conditions, are available [..]

A level of technology represented by a higher level of wastewater treatment technology than required by Best Practicable Technology (BPT). BAT is based on the very best (state-of-the-art) control and [..]