“What do you mean the septic system test failed? It’s on top of the hill surrounded by oaks.” Today’s standards require the bottom of your drain field trench to be 3 feet above seasonal water staining in the soils, even if that staining was 1000 years ago. “But it works fine!” A straight pipe to the river works fine too. It’s just not best for the environment. We’ll need to negotiate for the installation of a mound system. Raising up out of the ground is the only way to get the required separation. Who pays for that? Well, it’s negotiable, but it’s more the sellers problem than the buyers.