Depending pn usage, septic tanks can sometimes go 20 years before being pumped. My house has heavy usage (lots of people), so it gets pumped every 2 years or so

Depending pn usage, septic tanks can sometimes go 20 years before being pumped. My house has heavy usage (lots of people), so it gets pumped every 2 years or so. It could maybe go longer, but it's not worth risking it getting over-filled.