Water Appearance - Blue

If the water appears blue, fill a clear, colorless glass with water. Take it into a different room and observe it. Taking it into a different room will eliminate any reflection that may cause the water to look blue. If the water is still blue, it could be from one or both of the following.

• Copper plumbing is a source of colored water. When water stands in copper pipe, the water may absorb some of the copper, making it appear blue. This is most common when the pipe is new (less than one year old). If this is the case, the sinks typically have a blue stain below the tap. If your pipes are more than one year old and you have a blue stain in your sink, the plumbing may be corroding. Call a licensed plumber.
   
• The source may be automatic toilet bowl cleaner that turns the water blue. There may be a cross connection in the plumbing and water from the bowl is backing into the water pipe. If the water has been turned off, depressurization in the system may cause the blue toilet bowl cleaner to migrate to other fixtures, especially in apartments. Run the water for a few minutes. If the blue color persists, call a licensed plumber.