I moved into my husband's home 3 years ago and he has never had the septic tank pumped. I owned a home previously and had to have the tanked pumped yearly because it was only a 500 gallon tank and there were 5 people living in the home. I know they have to be pumped at least sometimes. I asked him when the last time it was pumped and he said never. He's lived in the house with 5 people since 1982-I have no idea how big the tank is. Isn't this a clue that something is wrong with the system, like it's possible routed somewhere else?