You'll have to check local codes, I can't dump in town in the street drains, or on any property under 10 acres.
But, I've also got a farm in Texas. Due to the laws here, I can run raw sewage if I so desire, there are no laws against it. I stopped by on my way back from FL where I went for Christmas. I had to empty just my grey water tank as I hadn't used the toilet, and then the fresh water to winterize it again. There were no other dumps on my way back to where I store it, so I decided to dump my grey water in an out of the way low spot. Talk about stink! I did not think grey water could smell that bad. By the next week when I got back, there was no smell, but I sure didn't want to stick around after I dumped it. So you may get complaints even if it's legal there.