Hi muddy...welcome to the zoo...for most boats in the US..all you need to do is have the sink drain overboard....no need for a holding tank....
in Canadian lakes...I have no idea what they are required...but if it were me..I'd tie a tee into the black water tank (aka santank) and let it drain there...but it will fill up alot quicker...so...it's best to probably have a hull fitting installed and let it drain overboard...
SP
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