At the risk of potentially asking an off-topic question, I'd like to better understand the maintenance of a septic tank. I've never had one before and am unfamiliar with how to manage one.

My primary question is: how often do septic tanks need to be pumped? We're looking to buy a 4/2 house with a concrete septic tank "supposedly" with a capacity of 2250.

My secondary question is: how should septic tanks monitored? Just an annual scheduled service check-up? I don't want to spend money needlessly but also don't want to neglect something that needs regular attention.