WET WET WET reported on ATIS but RWY not wet?

[safetypee]

(1) No ‘assumption’ is legal; any notion of legality must be replaced by the goal of being safe. Thus the choice of action must be justifiable to you and the crew.
If the WET x 3 report is the best information available, then use it.

(2) If the runway is not dry then it is WET or worse. See the refs in http://www.pprune.org/9263410-post18.html AIC 86/2007