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Unless you can trace it back to the faucet it'self check the backflow preventer which is usually under that same sink. It's a black thing that has water coming to it and then going back under the cabinet. They are known to leak and it will only happen when you flush the black tank.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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