The dump station itself is great, no complaints there, and it includes non-potable rinse water. The issue is if you also need a potable water fill; there's none at the dump station. We called the visitor center (where the dump station used to be), and they said to ask at the park's rec center, who said that we could fill at the picnic pavilion near the dump station.

Which is fine, but there's not a real water tap there. There are drinking fountains, and a "pitcher tap" with no threads. If you have a water thief, the latter is usable, but the pressure is quite low - filling our 40 gallon tank took 15-20 minutes. So not ideal.