I just contacted New York City's DEP to inquire about water quality. I'm told that chlorine gas is used for disinfection in NYC drinking water as opposed to chloramines, and that water treatment is the same in all 5 boroughs.
I plan to use a chlorine/chloramine remover to treat my water when I don't have time to gas it. However, DO make sure that you use one that's approved for human consumption of fish, such as Cloram-X. I bought an API product at Petland Discount, which is intended for ornamental fish only. Luckily I noticed the fine print prior to using it, and was able to return it.
Here's a link to the NYC DEP Annual Water Quality Report, which includes parameters tested for in the NYC drinking water supply:
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