The answer to 'how long does septic tank last' is that a properly maintained septic system can typically last 20-30 years or more. The lifespan of a septic tank depends on several factors, including the tank material, the size of the household, and how well the system is maintained.
Concrete septic tanks tend to last the longest, often 40 years or more with proper care. Plastic and fiberglass tanks may have a shorter lifespan of around 20-30 years. Regular inspections, pumping, and maintenance are key to maximizing the life of any septic system. Homeowners should have their septic tank inspected every 1-3 years and pumped every 3-5 years on average to keep it functioning properly.