We have a tiny house, outhouse, and big house under construction. Our water table is also at like 1' and lots of wells in the area. We have our outhouse go into a regular 30? Gallon garbage can. Saw dust to cover your deposit, switch out the can when it gets full. This gives everything lots of time to age before any possibility of contaminating the water table. Also we were doing construction and not ready to pick a long term humane pile location. Today I am doing the double wire mesh cylinders with wood shavings and straw on the bottom and all sides and a roof so we can start emptying our accumulated cans. We will empty all toilets into this pile which is in the orchard for easy use when done.