We also do water contamination checks during refueling. The syringe with the tablet on the end. Once tested, spit on it and check that it turns blue. Then you know that your tester was good and your fuel is water free.
I am asked by the crew to perform this check as part of my ETOPS transit check. But I always ask the same question, "And if I find any?" I don't know what I am supposed to do if I find water contaminated fuel during refuel? There are no empty bowers to do a defuel and all the fuel at my airport comes from the same place.
A330s accumulate a lot of water in the wings purely from condensation. In fact most long haul A/C that fly to hot and humid destinations will.