Try disable Auto Graphics API and change Graphics API to WebGPU in Project Settings>Player>Other Settings
I can make a WebGL build in Unity 6.2 with the water rendererd corretly on this setting.
Hello, the color you see in the demo and screenshots has gone through post processing.
I would like to keep the raw textures to appear greyish so there is more room for post pocessing inside game engine.
If you want the color to be brighter inside Photoshop, just apply a Hue/Saturation to it and bring up the Lightness and Saturation.