Plumbing Questions? Ask a Plumber and Get Answers ASAP.
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It sounds like either the outlet to the leaching field is blocked or the field has failed. The first thing you should do is have the tank pumped and have them check the tank outlet. If the tank hasn't been pumped in the last couple years pumping it may be all that's needed.
Did they check the outlet to the field? Sounds like you could also have a broken drain line between the house and the tank. If you had a clogged inlet then you'd likely get a back up from the lowest fixture in the house. I suspect it could be a combination of a leak in the drain line and possibly a restriction i the outlet.
Either dig it up or put a camera down the line but digging it up would be a lot less expensive if you do the digging and a camera won't necessarily show all possible leak sources.
Like I said before a clogged inlet is unlikely. You'd have to dig up the tank outlet and pull the cover to check for a clogged outlet
The same guys that pumped your tank can probably take care of a clogged outlet, most do. It's often a simple matter of snaking it out or just breaking up the deposits at the outlet baffle. No way to tell what it would cost. Maybe a couple hundred, less if you dig up the tank. You might even be able to do it yourself if it's just a build up at the baffle. Your suspicions are another possibility. You can confirm either theory by uncovering the tank lid then flushing the toilet several times in a row. If you're right you'll see it seep out. If it's a leak it the drain it won't show on top of the tank.
You're welcome. Yes, the only way water would seep out of the lid is if it can't get out of the tank via the outlet.
Most likely place for a blockage is right at the outlet so the effluent is never making it to the field.I'd appreciate a favorable rating