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I know I am going to get toasted for this....but, however you plumb it, please don't run it, "into the creek."
(see how polite I was, I said, "Please.")

Now, let the discussion begin.

Are you sure you have been doing this since 2013?

is the sink against the outside wall? If so run it through the side. Stub out a MPT fitting and screw on a cap, then make whatever adapter you need to drain it to a drywell or something OTHER THAN THE CREEK!

Interesting... Never heard of this being done before... I think I want to live upstream!

tooldad1041, in every State I've been in there are laws about disposing of greywater. I've been in some areas that encouraged it to be spread on the dusty gravel roads, but even the they were clear no to dump near a stream. Please don't. Greywater sounds better then black water but it's still not safe to dump into any stream. Please collect it and transport to the proper disposal (sewer) system.

OP deleted his post, thread locked.