Yes. Septic systems can work effectively for 25 years or more if properly maintained. But its often a case of out of sight, out of mind. A system can be failing or polluting nearby surface water without there being visible signs. So before purchasing property with a septic system, ask for documentation on design, location and maintenance, look for signs of failure and have the system professionally inspected.
If a new septic system is contemplated, it must be designed by a Maine licensed site evaluator and installed according to the standards in the Plumbing Code, as administered by the local Plumbing Inspector, with a permit, of course.
