The 30 year old property we want to purchase has a Title 5 Certificate. What does that mean?

The Title 5 certificate is the septic equivalent of a home inspection. The septic system was located and assessed according to specific criteria. Although the system is thirty years old, it works well at the time it was inspected. Septic systems typical lasted 25- 40 years and you should expect to repair or upgrade this system within the next ten years.