Theres a few people that do it. There are precautions you should know about like parasites, bacteria, contaminates, ect. Plus, most of the waters around new york are kind of dirty so if you want "clean" saltwater the best way to do it is RO + salt mix. Your pretty much throwing dirty bay water into your tank unless your pulling water from the tip of long island. High nitrates, Po4, ect can come from grabbing water off the brooklyn pier ontop of oil and fuel residue and other unwanted stuff. If your running a dirty softie tank where dirty water is a plus this might not matter, but if you want SPS and color then I would do RO + salt mix. Theres probably a bunch of other things that can be an issue that escape me that someone will chime in on.