You say, "I am fairly certain that this type of drain is grandfathered-in," but I doubt it. It was never legal to begin with. Answering your question is somewhat moot, because you must tie the sink to the sanitary system.

With no better image than your explanation, I donÂt know what you have done to create the new sump system. But they are two different systems and may not be joined. If you need to make serious concessions to get the kitchen waters to the drain field, so be it.

If that solves the sump system issue, fine.

We will help you do this.

Pinoke

This cannot be grandfathered in for two reasons:

1. Your contractor installed the sump crock during your renovation and you opted to move it so this is all NEW WORK. How could you justify a grandfather here?

2.The discharge from a sump is classified as "Storm Drainage" and the Plumbing Code prohibits discharging storm drainage into a Sanitary Sewer while on the other hand, the kitchen sink drain is a "Sanitary Drain" and the Plumbing Codes, Health Codes and EPA regulations strictly prohibit discharging sanitary waste into a storm drainage system.

The real question here is; where did the kitchen sink drain before your contractor installed the sump crock?