This Is Draining Me

So there's this!

Seems to be a grey water drain coming from the abutting neighbors trailed, which a good ~20 feet or so over the property line and draining onto our Oakdale lot-

The red circle in the below pic is approximately where this drain is located and the red stars are the property line.  As you can see it's well over the line -

From what we've see so day, the area where this is draining stays wet constantly! It's also in the area of our Oakdale property that we use as an access point, sometimes, to our Pritchard property.  The combination is making for a rutted and wet muddy mess.

We're assuming it's grey water but what it's actually draining we do not know.  Seems to be clear, so guessing their washing machine perhaps?!

Ironically, the neighbor who "owns" this drain has raised concerns with both myself and my brother about driving over said pipe (for fear of crushing it).  Initially, we really didn't know what she was referring to, nor at that time did we know where the actual property line was.  However, we've since had the Oakdale lot surveyed and now know with 100% where the property lines are.

This drain is a NO NO, in our eyes as owners and we're fairly certain from the town! It's clearly a potential health issue; who knows what's actually draining out of there, and not something we plan to ignore or let remain.

Stay tuned on this all plays out...