I met a guy recently that installs and repairs septic systems. He stays busy and told me that if a system is put in and used correctly it should never need pumping. He said bad installs keep the pumping fellas in business. BTW, I asked the same question on here since our new house is the first one that I've lived in as an adult with a septic tank. I got the same answer from several on here. Then I got several that said to go ahead and get it pumped so you'll know it won't be a problem soon.