The law is about gray water, this includes showers, kitchen sinks, and laundry. They don't make an exception for little bar sinks that probably won't be a problem, because they are bureaucrats. Gray water is bad as nutrients in the discharge feeds algae and other stuff in the water ruining the water quality and clarity.
Bilge water should not have any oil in it unless your boat is broken. Discharging oil into the lake is also illegal.
My boat and most late model cruisers bought on the lake are ordered form the factory with gray water systems. It's an extra cost option only needed in a places. All the gray water is routed to a tank that I pump out when I pump the toilet tank. Most non-lake boats dump gray water directly overboard.
When someone moves a boat to the lake, the DES check them out. You are supposed to tell the DES when you move a boat with facilities to the lake.
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