Albany is the capital of New York and is close to the Adirondacks. Most of the dump stations (except the free one inside Albany city limits) can be found within campgrounds and RV parks and are free for registered users.
The dump stations in and around Long Island are principally located in campgrounds and are free to use for registered guests, except for a free waste dumping facility located in Huntington. New York City is just east of the area.
Ithaca is in the Fingerlakes Region of the state and has plenty of dump stations, many of which are located in campgrounds and RV parks. There is a free dump at the Watkins Glen International Raceway.
Poughkeepsie is on the Hudson River and is surrounded by RV dump stations that are located in RV parks and campgrounds. Most of them are free for registered users.
Buffalo is near many attractions, such as Niagara Falls and Canada. Most of the RV dump facilities are in RV parks and campgrounds; however, there are a few free options to be had.
As you can see, there is no shortage of motorhome dump stations in New York. Keep in mind that, although there are some New York RV dump stations that are free for all, the majority of the RV dump stations in New York are located in parks and campgrounds and are only free for registered users. Additionally, these dump stations in New York are conveniently positioned near major highways, meaning you'll have no trouble getting to them quickly and without having to endure too many backroads and city traffic.