Whatever happened to the paste or syringe pill tests? If I ever get evidence of water in any tanks, I just open the fuel drain and let it drain out until the water disappears, particularly in a bug smasher. Dash 8, let the engineers deal with it and I’ll call the flight attendant for another black coffee!
Not only that but how could you do a fuel drain and not notice that water was coming out and not fuel?? It's obvious when it happens. I've experienced it numerous times both with AVGAS and Jet-A1. Honestly if I was the ATSB I would have been pumping the pilots about whether they really were doing the fuel drains. After seeing it few times for real I cannot believe that you could be doing the fuel drains and not know.