How to fix texture color problems

The siege map I've been working on is coming along nicely, but has an issue. For some reason, whenever I do a sewer, the texture gets rendered a bunch of different colors depending on which face you're looking at. They don't change colors as you move, but let's just say the sewer looks like a bunch of hippies moved in. An example is in my cs_siege map description. Also, I ened up taking out the cylinder, and creating the current sewer from scratch using 6 block brushes, and 4 wedge brushes. I have patched all leaks in the map, I have cubemaps, water-lod entities, and the cubemap is more than 16 units above the water. Any ideas as to the cause of this problem?

The multi-colored effect can happen if you use a texture that is meant for models. You should check to make sure its not a model/prop texture.

Have you run buildcubemaps in the console?

Thanks for the help guys! It was model textures.