No, dumping grease down your house drains will cause grease buildup in your own drain lines. Some people believe that if you mix hot water with the grease, it will not clog your lines. While this may not clog the lines in your immediate house, by the time the grease gets to your sewer pipe it will have cooled enough to build up. Keep in mind, you are responsible for the maintenance of your side sewer and calling out a plumber for this type of maintenance can be very expensive.