When should I flush water lines in my house?

It’s always a good idea to flush water lines when water has not been used for several hours. This is true whether you have a lead service line. 

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1. When should I flush water lines in my house?
2. Why should I flush water lines?
3. How long should I run water to flush water lines in my house?
4. How can I conserve water when flushing water lines?
5. What other ways can I flush the lead service line?
6. When should I find alternatives to flushing / when is flushing not recommended?
7. I get my drinking water from my refrigerator; does its filter remove lead?
8. What should I do if my water service line has been worked on (e.g., cut, repaired or replaced)?
9. What should I do if my lead service line has been worked on (e.g., cut, repaired or replaced)?