What does the lead and copper rule require regarding sampling?

The lead and copper rule is designed to protect public health by minimizing lead and copper levels in drinking water. It requires that sampling is done at the consumers' taps because this is the point where the water enters the home or business, reflecting the actual exposure that consumers will have to these contaminants. Testing at this point provides valuable data on the water quality as it is delivered to end users, rather than at points earlier in the system, where conditions may differ significantly.

By collecting samples from the consumers' taps, the rule aims to ensure that any lead or copper that may leach into the drinking water from pipes and plumbing fixtures is accurately quantified. This approach helps regulatory bodies assess compliance with established action levels for lead and copper in the water supply and determine the need for interventions or public health responses.