A primary drinking-water contaminant. Home treatment claims on this site stay on NSF/ANSI 53 or 58 lead-reduction listings for the exact model — not a story about what the filter protects you from.
Category
health effects-standard
EPA status
EPA’s lead and copper rule uses a 15 ppb action level at the 90th percentile of tap samples, not a finished-water MCL printed the way nitrate is. That number is plumbing-side as often as it is a plant number.
Typical sources
Lead service lines, solder, and fixtures. A CCR 90th-percentile row is not the same as a grains chart.
What actually fits
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We will not write medical endpoints. EPA regulates lead at the tap under the Lead and Copper Rule. The action level is 15 ppb at the 90th percentile of samples from high-risk homes. That is a compliance statistic. It is not your kitchen faucet unless you sampled that faucet.
Shopping language is narrower: the exact model listed for lead reduction under NSF/ANSI 53 or 58. A generic “NSF” badge or a chlorine-only 42 carbon tank is not that listing.
The city list below only includes files that already print a lead metric or a printed also-around value. We do not invent a 90th percentile from a state average.
Cities on file
Only numbers and notes already printed on a city Markdown file. We do not invent a detection to fill this list.
Highest cited numbers on file
Only values already printed on a city file. Sort is the optional numeric field, not a new lab result.
Brentwood — Lead 1.25 ppb (action level 15); copper 0.12 ppm (action level 1.3). No sites above the action level.
Hollister — Lead 90th percentile 2 µg/L (40 sites sampled), AL 15. Copper 90th percentile 0.082 mg/L (40 sites / 0 above AL 1.3). Narrative says Hollister-area lead and copper results have been below the State Water Board notification level.
Malibu — Lead 90th percentile 0 ppb (0/38 above AL 15). Copper 90th percentile 0.10 ppm (0/38 above AL 1.3). Sampled 2023.
Portland — Oregon Health Authority Data Online for PWS 00657 lists June 2025 90th-percentile lead 0.0049 mg/L at sampled taps — the LCR statistic, not every address.