Smells like eggs, onions, or similar odor:

Probably hydrogen sulfide, one of two common types of sulfur that commonly does not pose health risks. Check out these links for more info:

Orange, brown, or black stains:

Probably iron or manganese. For more information follow these links:

White chalky spots on dishes and plumbing fixtures:

Sounds like hard water. The spots are calcium and magnesium. See info at:

More information on testing and treatment

Try these links and also visit our Water Treatment page.