Lead is unusual among drinking-water contaminants: it’s rarely present in the water leaving a treatment plant. It’s almost always picked up between the water main and your tap — from a lead service line, brass fixtures, or lead solder in household plumbing built before 1986. That means two identical houses on the same street can have very different lead levels, and a “safe” utility-wide report doesn’t guarantee your own tap is lead-free.
There is no safe level of lead exposure, and EPA has set the health goal (MCLG) at zero. The current action level under the Lead and Copper Rule is 15 ppb; the Lead and Copper Rule Improvements lower that to 10 ppb starting November 2027.
What actually removes lead
Three filter technologies are independently certified to reduce lead in drinking water:
- Reverse osmosis (NSF/ANSI 58) — a multi-stage membrane system, typically installed under the sink, that removes lead along with a wide range of other dissolved contaminants.
- Activated carbon (NSF/ANSI 53) — but only carbon filters specifically certified under NSF/ANSI 53 for lead reduction. This includes many pitcher, faucet-mount, and under-sink carbon filters — as long as the specific model’s certification listing names lead.
- Distillation (NSF/ANSI 62) — boils water and condenses the steam, leaving lead and most other non-volatile contaminants behind.
What doesn’t work
Not every carbon filter removes lead. A pitcher or faucet filter certified only under NSF/ANSI 42 is tested for chlorine taste and odor — not lead or any other health-effect contaminant. Buying a filter because it says “carbon filter” or “reduces contaminants” on the box, without checking whether lead specifically appears on its NSF/ANSI 53 certification sheet, is the single most common mistake. Boiling water does not remove lead — it can even slightly concentrate it as water evaporates.
How to choose
- Check the manufacturer’s NSF/ANSI 53 (or 58, or 62) certification documentation and confirm “lead” is explicitly listed as a reduction claim — not just implied by marketing copy.
- If you have a lead service line or pre-1986 plumbing, a point-of-use filter at the kitchen tap addresses the water you actually drink and cook with; a whole-house system is not required for lead specifically (lead is picked up in your own plumbing, so filtering “upstream” of it doesn’t help).
- Run the tap for 30 seconds to a few minutes before using water that has sat in pipes overnight — this flushes out water that had extended contact with lead-bearing plumbing, though it isn’t a substitute for filtration or line replacement where lead is confirmed present.
Test before you buy
Lead levels vary house to house, so a filter is worth buying only after you know your own tap’s lead level. A certified lab test (or a free test kit from your utility, in many areas) confirms whether lead is present and at what level, so you can pick the right technology instead of guessing.