Common types of stains that may be attributed to water quality include blue-green (copper), rust (iron), and black (manganese). Normally, City of Aurora tap water will not cause staining resulting from copper or manganese.
Rust staining is usually caused by iron from internal plumbing that is older or heavily corroded. Iron deposits found in water heaters may also contribute to staining. Normally, City of Aurora tap water will not cause iron staining.
Pink or black stains in shower areas or toilets are usually caused by microbiological growth and should be controlled by proper cleaning.