Separation is the keyword. For this, there are:
The pump-out system is the answer. Waste and oily water must be pumped-out by this system which is located at the fuel quay.
Never discharge such water in the Marina. While you are in the Marina, do not use the toilet facilities of boats which do not have a holding tank. The bathrooms in the surrounding area are available for this purpose!
Prevention is the best advice. Always wear appropriate protective equipment when handling chemical products.
In the event of accidental spillage, there is specific material for combatting this in the boatyard and next to the fuel station. Inform the Marina Services about any occurrence!