“There are also a lot of “fake” septic systems in areas with a lot of septic systems. What’s a fake system, one where the out pipe runs directly down to the river or other open waste area.”
My cousin bought a house in the country by a creek and was told it had a modern septic system. After painting in preparation to move in he was washing brushes in the kitchen sink. A trail of paint started flowing down the creek almost immediately.
Shouldn't rinse latex paint down lines going to septic tanks anyway, the latex can plug the drain pipes in the leach field.