Lead is the contaminant where a general purpose filter is not good enough and where the interim measures matter, because they cost nothing and start working immediately. Three technologies are certified for lead reduction at home, and the choice between them depends on what else is in the water and how much of the house you want treated.
What to do today
Use cold water for drinking and cooking, always, because hot water dissolves lead more readily and most filters are not rated for hot service. Run any tap that has stood for hours until the water is noticeably colder before drinking, which flushes out the water that has been sitting in contact with pipework. Do not boil water to address lead, since boiling slightly concentrates it. These steps reduce exposure while a filter is chosen and fitted, and they cost nothing at all.
Certified carbon blocks
The most practical route for most households. A fine carbon block with a lead specific adsorbent, available as an under sink cartridge, a tap mounted unit or a pitcher, and certified specifically for lead reduction. Certification is the whole basis for choosing: certifiers publish listings naming the model and the exact claims tested, so look the model up rather than trusting a mark on the box. Use it on cold water only, and change it on rated volume, since lead breakthrough gives no warning.
Reverse osmosis and distillation
Reverse osmosis rejects lead along with most other dissolved material, which makes it the better choice where other contaminants are also present, at the cost of installation, a drain connection and cabinet space. Distillation removes it too and is slow and energy intensive, which limits it to small volumes. Both treat drinking water at one point rather than the whole house, which is the correct scope: ingestion is the exposure route, so treating every tap costs far more for no additional protection.
The durable fix
Lead comes from the service line, from solder on older copper joints and from brass fittings, so a filter manages exposure while the source remains. Utilities often hold records of which service lines are lead and many run replacement programmes, which is worth asking about. The EPA notes every community water system publishes an annual report, and that is the place to start. Replacing the source ends the problem. Our lead removal guide covers certified options by format.
Questions people ask about how to filter lead from water
Will any carbon filter remove lead?
No. Only a model independently certified for lead reduction, which you confirm in the certifier's published listing.
What can I do before fitting a filter?
Use cold water only for drinking and cooking, and run a tap that has stood until the water is noticeably colder.
Does boiling help?
No, it slightly concentrates lead, since water leaves as steam and the lead remains behind.
Should I treat the whole house?
No. Ingestion is the exposure route, so a certified filter on drinking water gives the same protection far more cheaply.