Our home septic system has been giving high water alarms whenever we get a significant amount of rain. Even when nobody is home for several days and no domestic water is being used. Everything is peachy when it's dry weather. Clearly rain/ground water must be getting in somehow. It's a
Glendon Biofilter system, with a set of tanks by the house that catch the solids and then discharge the liquids to the mound system that's about 400 feet from the house.
We've dug up the pipe that leads from the house to the buried tanks. The ground around it is dry as a bone. There's also a pipe that transfers the water from one portion of the tanks to another. I dug that up and while the ground is wet, it's hardly saturated. We used the hose to flood that trench to see if we could make any water flow into the tanks but if it made a difference to the dribble that was constantly going on anyway, I couldn't tell.
We're probably going to get the septic guy out to pump the tanks (the solids tank is pretty full) and I'd like to also have him inspect the system to see if any faults can be found. But in the mean time some tips on what to do and where to look to Dx the problem would be appreciated. That will also help me figure out if the septic guy tries to scam me on any repairs.
