If there is a tap intended for potable water close enough to a dump station, you have to realize someone will use it to rinse black tank and sewer hose.
Most taps near dump stations I use have a sign saying not to use them as a potable water source. Not that anyone pays attention to that either
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder