- If your lead service line is very long, flushing may not completely lower lead levels.
- If your home has old (corroded) galvanized iron pipes, flushing may not be practical. If the water flows slowly in your home and you have galvanized iron pipes, these pipes may be severely corroded.
If you have a lead service line, the water may need to run for at least five minutes to significantly reduce lead levels. This may not be practical, and you may wish to consider using a water filter certified to remove ‘total lead.’ Total lead includes lead dissolved in the water, as well as lead particles that come loose from the plumbing.