Septic tank - red flag?

[Rohan D.]

Hi BP folks, I am about to make an offer on a house when I found out the house has a septic tank. I do not know anything about it, but after doing some basic reading, it looks like an expensive affair.

Firstly, should I pass on the house because it has a septic tank? any disadvantages.

Secondly, if septic tanks are ok? What all should I make sure has been repaired, maintained, serviced etc. and how much budget should I account for its maintenance monthly? 

Any inputs will be much appreciated.

The house is 24 years old.

Thanks!!