What is the action level for lead in first-draw samples from customer taps?

The action level for lead in first-draw samples from customer taps is established at 0.015 mg/L. This standard is critical for ensuring safe drinking water. The regulation is in place primarily to protect public health, especially considering that lead can have serious health implications, particularly for young children and pregnant women.

When water sits in contact with lead-containing plumbing for a period of time, like overnight or over a weekend, it can leach lead into the water. First-draw samples, which are collected as the very first water drawn from the tap after a water stagnation period, are significant because they can often contain the highest concentrations of lead. If lead levels exceed the action level of 0.015 mg/L in these first-draw samples, the water supplier is required to take specific actions to mitigate lead exposure, including public education on lead hazards, offering lead service line replacements, and testing of homes for lead.

The action level thus serves as a regulatory marker, prompting necessary interventions to protect consumers.