Alex,

Be sure to check out Noonsite: https://www.noonsite.com/place/usa/

The lack of a holding tanks could be an issue for you as you cannot discharge "black water" within 3 miles of shore.  It's a significant fine on the order of US$2000 if you are found to be in violation of the law.  Here is a link to the EPA website regarding this issue:  https://www.epa.gov/vessels-marinas-and-ports/vessel-sewage-frequently-asked-questions#ndz

At the end of the EPA page there is a list of people you can contact about this.  I would contact one of them and see what they say,

--
Mark McGovern
SM #440 Cara
Deale, MD USA