I worked for a GC that built a mini storage complex that was across a creek from the big city sewage treatment plant. You could literally throw a rock across the creek to the treatment plant. But, there was no line within many thousand feet. There was the bathroom in the office, one in the apartment for the keepers of the mini storage and a restroom at the back of one of the buildings. They spent $50,000 putting in a "drip" septic system. First of its kind in the state. Took six months to get approval. Would store the stuff in a 1500 gallon tank and then run it out through drip lines through the woods.
