Tile bed or leaching bed has a sewage odour
Solids may not be getting broken down & are retained in the septic tank, thereby entering the leaching bed; water may not be draining properly; pipe may be clogged. Call a licensed tank contractor have the system checked.
Black oily liquid pooling or bubbling on surface
Call a licensed tank contractor to have the system checked IMMEDIATELY!
Waste water backing up in home
If the level in the tank is at normal operating level, the pipe may be blocked from the house or the inlet baffle may be blocked or there may be a plumbing problem. In all cases a call to your plumber is in order.
If the level in the tank is too high, the outlet baffle may be blocked, the filter(if one is installed) may need to be cleaned or replaced, the pipe to the tile bed may need to be checked. In this case, call a licensed tank contractor have the system checked.