If your house is on a crawl space it is relatively easy to set up a gray water system. You can always make it as easy as having that pipe empty over the lawn.
My baby sister still lives on the home place in Texas, and she has a very high raccoon population. She hasn't mentioned possums lately, and I don't remember many of them growing up.
Here in Alaska I have no raccoons and no possoms.
I have a terrible time with raptors, and with neighbor...
Oh! I get it!
Yep....my family is from Texas.
My favorite joke about West Texas is "We had our 5 inch average rainfall last year, I remember the night it came".
I am more of a fan of a good old fashioned outhouse. Much less expensive and they can't break down.
Ditto with a wood stove verses some kind of solar powered heater and cooker.
Back when I considered being completely off grid, I really thought that the easiest (fewest parts that would break...
I used to live with on again and off again water..... I usually had electric though.
So I hauled water. The town I live close to has free water for hauling at the grocery store.
Most of my heat, then and now is wood.