I did a few quick searches in the various forums and didn't get much back on this here. maybe I didn't use the right key words?
I live on the base of a mountain. Very tall trees and somewhat sloped land. My only option for a sun garden was on the lower half of my drain field. The drain field as a whole is maybe 80 feet by 50 feet, with 7 runs. I know this as my yard is terraced by the lines. My raised beds cover 3 lines. I want to expand my garden and start putting in rows. Which would of course need to be directly on top of the drain field. I would grow various crops on the rows, such as kale, beans and squash.
I have seen multiple opinions regarding the placement of my raised beds. On other forums, most of which are positive. In summary the other forums say this: You may cause issues with your drain field by not allowing it to breathe. Be careful of root crops. If a drain field is working properly, there are no concerns as the above soil filter out the pathogens. I made a mention of my setup in a different forum and it was mentioned by Paul that it is a no no. I can not see why this would be an issue. We are very particular of what goes down the drains. I could possibly see too much N as a result though..
One other key part is I have a grind and pump system so the material sits in a tank is put through a grinder and fills to a point before it is pumped out to the lines.
No one at my house takes prescriptions, so uptake of pharmies by my plants is not an issue.
Mobile Chicken house build-
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