Terry, I have what seems to be a grease trap problem! House was built in 1928 Denver colorado. Homes in my part of town sometimes do have grease traps. How deep will the tank be in my yard? 2nd question - Do I have a septic tank? How will I know? I haven't found the grease trap yet but it is leaking. Water has come up through the ground. I dug down about 5 ft and found the grey water and probably grease. Not sure what to do now. Thanks,