I have a separate septic tank for my kitchen sink (a grease trap?) which has now backed up into my backyard. It is a 100-gallon tank with clay drain pipes. It appears that the backup is due to the clay pipes either shifting, or being interrupted by tree roots. Either way, my question is whether it would be better in the long run to redo the drain field, or if I should just divert the kitchen sink into the main septic tank, as was suggested by my local septic tank company.
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Grease interceptors are NOT like septic tanks. They are holding tanks to catch the grease and retain it until it is physically removed. MILLIONS of homes have their sinks running into the septic tank, so if your grease trap is "really" inoperative, and not just in need of pumping, which IS the proper maintenance for a grease interceptor, then there is no problem with connecting it to the septic.
Licensed residential and commercial plumber