Now Open! Aqua Rocket (HD POV) at Raging Waters San Dimas. This is the first hydromagnetic water coaster in the State of California. Aqua Rocket opens to guests for the first time on 5/23/2015

Another example of a water coaster is Crush n Gusher at Disney's Typhoon Lagoon in Walt Disney World.

After doing some research, it looks like there's also another water coaster in California called "Master Blaster Water Coaster" at Sun Splash in Roseville, CA

ProSlide HydroMAGNETIC water coaster