There is a dump station here and is accessible with a day pass ($6 in 2017) Also if you are a NY resident, 62 or over, this day pass and dump station use is free. Called the Golden Park Program, is available at most NY State Parks.
The people and staff are very friendly. The prices are very good. Being a State Park, the there is only electricity but that's to be expected. Very nice water front and a pier to boot for water sports. There is also a little Park and beach which our 5 and 3 year old really enjoyed. Am visiting again this year.
There is a dump station here. Cost is the $6 (or what is current) day fee.