Oooook. So I'm not going to pretend I know everything about pool parties in Scottsdale AZ, but I can tell you what I know about 4 top places that will probably come right up on google if you're searching for some cold water on a summer day in this egg-frying hell we call summer.
Maya Day Club, The W Wet Deck, Hotel Valley Ho, Release -> The most popular pool party spots
Maya Day Club is undoubtedly the most well known craziest pool party in Old Town. They have a huge outdoor pool that attracts many residents and out-of-towners on the weekends. There are always DJ's, and depending on the popularity of the DJ the place is either semi-packed or totally packed. For your own sanity, I recommend downing a lot of drinks before even heading into this madhouse. It's a lot of fun if you're blasted, but don't try going there sober.
The W Wet Deck is probably the least crazy out of these 4. It's a rooftop pool at a pretty fancy hotel, and is the epitome of luxury, but they're still on their way to being a true pool party. They brag a DJ on the weekends, but from my experience it's mostly bachelorette parties and W hotel guests that hit up this spot. There is plenty of room in the pool to chill, and if you go on week days you can sit in any of the cabanas.
Hotel Valley Ho is a bit of an older crowd. I'd say this pool is larger and more crowded than the W, but it's all vacationers, and mostly people over 40. I'd recommend this pool if you're going with your girls, but I don't see young guys having fun here.
Release is a good spot if you like EDM. It's a huge events hub in the Talking Stick Resort. I personally haven't been here but have many friends who go to the shows weekly. Huge names like Louis the Child, Boombox Cartel, and Paul Oakenfold have all graced the stage just this last month.
Let me know if there are any other pool parties in the Scottsdale area that you love!