What's this pink/black stuff in my bathroom?

We get calls from time to time by property owners asking about a pink or black film around plumbing fixtures, showers/tubs or toilets and at the bowl water level wondering if there is something wrong with the water. This condition can be caused by an airborne bacteria that can breed into a pink or black stain once it encounters a wet or damp environment. See link for in-depth article describing this condition.

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1. I have a water quality problem. Who do I contact?
2. Where do I pay my water bill?
3. I have low or no pressure in my house! HELP?!
4. My water meter is leaking. How do I get it fixed?
5. How do I read my electronic meter?
6. My water smells like rotten eggs! Why?
7. I have a leak in my house. Will the water utility fix it? Who is responsible?
8. Where does my water come from and what's in the water?
9. I have blue, green, red, yellow and white flags in my yard. What are they for?
10. What's this pink/black stuff in my bathroom?
11. Why does my water look like light colored coffee?