Last night the septic alarm went off.
<Doom music> Dum dum dummmm </Doom music>
All I could remember was during the buying process the inspector saying you never want to hear that. All I could do at the time was shut off the alarm.
This morning with the help of a service tech on the phone I managed to find out the trouble. Blocked effluent filter between the tank and the field. Turned out to be a fairly simple fix, just had to remove the filter and hose it out.
Mmm, nothing like working with sewage. Oh the joys of country living.