Lead usually comes from your pipes, not the source
Unlike PFAS, lead rarely comes from the reservoir or aquifer. It leaches in from lead service lines, old solder and brass fixtures, usually inside your own home's plumbing, most often in homes built before 1986. That is why a citywide number can look low while an individual older home does not.
The 'action level' is not a safety line
The EPA action level is 15 micrograms per litre at the 90th percentile of sampled homes. It is a trigger for the utility to act, not a health-based limit. The health goal for lead is zero: there is no known risk-free level, especially for children.
A result 'below the action level' means most sampled taps were under 15 µg/L. It says nothing certain about your specific tap.
Reading your city's lead result on PurityMap
PurityMap shows the most recent 90th-percentile lead result from the EPA Lead and Copper Rule for your system, with its date. For example, Tucson Water's latest result was 0.65 µg/L — about 4% of the action level — which is a system-wide signal, not a reading for any single home. Open your city water report to see your own system's number, and treat it the same way.
What to actually do
If you have older plumbing, the only way to know your tap is a certified lead test of your own water — see how to test your tap water at home. To reduce exposure now: run the tap before drinking after long stagnation, use cold water for cooking, and use a filter certified to NSF/ANSI 53 for lead. Replacing lead service lines is the permanent fix. PurityMap may earn an affiliate commission on some product links, at no cost to you.
This article gives general information about lead in drinking water. It is not medical advice and does not determine whether any water is fit for a specific person. For concerns about lead exposure — especially for children or during pregnancy — consult a licensed healthcare professional, and use a certified laboratory to test your own water.