It would likely violate a code if you have a code to violate in the middle of nowhere northern MN. Greywater includes soap chemicals, grease and all the other goodies that usually aren't handled through a sump to daylight.
What are the signs you are overloading your septic system? When was the last time the tank was pumped?
What are the signs you are overloading your septic system? When was the last time the tank was pumped?