Just to be a mite more specific:
The laundry room at the Grandstand pool is at the far end of the pool (from the walkway to Carriage House), on the right...its door is just pass the "hallway" that houses the restrooms and towels...
As I recall, there are two washers and dryers...they do have coin slots, but you do not have to put coins in them. There is also a vending machine that sells individual portions (one load each) of detergent (they were $1, but haven't done laundry there in a couple of years and prices do tend to rise)...you can also buy detergent at the Artists Palette store (in 3-load boxes, too)...I think the prices are the same in both places...
It's a pretty nice facility...and there's a bench right outside if you are one who wants to wait "on site" during the wash/dry cycles ... it's nice to be able to relax pool-side but still be "with" your laundry...