Our toilets bubble when we wash clothes. Our septic tank & field is 6 years old and has never been pumped out. Our household is 2 adults. Should I call the septic service or a plumber?

Our toilets bubble when we wash clothes. Our septic tank & field is 6 years old and has never been pumped out. Our household is 2 adults. Should I call the septic service or a plumber?

Let's check and see. There's no doubt that you have something that's causing you backpressure, hence the bubbles.
Locate the house clean out. This will be found close to the house foundation on the septic tank side. We bring them to grade but you may have to probe around with a pointed rod to locate it.
Once found, open it up and cycle the washer. If the clean out fills up call the septic service to pump the tank and check the drainfield. If the line's dry the problems in the house and the lines will have to be snaked.
Good luck, Tom