If it's been a while since you had your septic tank pumped, and you're not having any problems, you might think you're in the clear. Unfortunately, that's not entirely true. Just because you're not noticing any problems with your septic system doesn't mean everything is fine. It merely means that you haven't noticed the problems yet. The truth is that you could have problems that you're not aware of. Or, your septic system could be building up to one climactic failure.