If a household's lead level in a 1 liter water sample exceeds 15 ppb, which action is recommended?

If a household's lead level in a 1 liter water sample exceeds 15 ppb, which action is recommended?

• A. Never use water from the water tap for drinking or cooking
• B. Checking for lead solder
• C. Not boiling water longer than necessary for making baby formula
• D. Run tap water 30-60 seconds

Answer: (D)

When lead in tap water is above 15 ppb, the quickest way to reduce exposure at the tap is to flush the cold water for a short period before using it for drinking or cooking. Running the tap for about 30 to 60 seconds replaces the water that has sat in lead-containing pipes and fittings with fresher water from the supply, which usually carries lower lead levels. This timing works well for typical home plumbing and helps minimize lead intake from each use. Boiling the water does not remove lead and can actually concentrate it as water volume decreases. So the idea of boiling longer is not effective for reducing lead. Checking for lead solder or other sources is helpful for identifying where lead is coming from, but it doesn’t lower the lead level in the water immediately. And while suggesting you never use tap water would be overly cautious in most cases, the recommended immediate step is flushing to reduce exposure, not abandoning tap use altogether. For ongoing safety, use cold water for drinking and cooking, and consider additional steps like filtration or further testing if elevated lead levels persist.

When lead in tap water is above 15 ppb, the quickest way to reduce exposure at the tap is to flush the cold water for a short period before using it for drinking or cooking. Running the tap for about 30 to 60 seconds replaces the water that has sat in lead-containing pipes and fittings with fresher water from the supply, which usually carries lower lead levels. This timing works well for typical home plumbing and helps minimize lead intake from each use.

Boiling the water does not remove lead and can actually concentrate it as water volume decreases. So the idea of boiling longer is not effective for reducing lead. Checking for lead solder or other sources is helpful for identifying where lead is coming from, but it doesn’t lower the lead level in the water immediately. And while suggesting you never use tap water would be overly cautious in most cases, the recommended immediate step is flushing to reduce exposure, not abandoning tap use altogether.

For ongoing safety, use cold water for drinking and cooking, and consider additional steps like filtration or further testing if elevated lead levels persist.