On December 6, we learned this from President Trump:

“We have a situation where we’re looking very strongly at . . . elements of bathrooms . . . in areas where there’s tremendous amounts of water — it’s called rain — where the water rushes out to sea because you could never handle it. . . . People are flushing toilets 10 times, 15 times, as opposed to once.  So EPA is looking at that very strongly at my suggestion.”