Lead in Drinking Water
Inorganic Chemical · MCL: 15 ppb · 3 systems exceeding limit
Overview
Lead is a toxic metal that was widely used in water pipes, solder, and fixtures until Congress banned lead in plumbing materials in 1986. The EPA's Lead and Copper Rule requires water systems to monitor lead levels at customer taps. If more than 10% of samples exceed the action level of 15 ppb, the utility must take corrective action. The EPA Safe Drinking Water program sets and enforces the maximum contaminant levels shown here.
Health Effects
Lead exposure can cause developmental delays in children, kidney damage, and high blood pressure in adults. Even low levels of lead in drinking water can be harmful, especially for infants and young children. The EPA has set the Maximum Contaminant Level Goal (MCLG) at zero because there is no known safe level of lead exposure.
Sources of Contamination
Lead enters drinking water primarily through corrosion of lead pipes, lead solder, and brass fixtures. Homes built before 1986 are more likely to have lead pipes. Lead service lines connecting water mains to homes are the most significant source of lead in drinking water.
Treatment & Removal
Point-of-use water filters certified for lead removal (NSF/ANSI Standard 53), reverse osmosis systems, and distillation can reduce lead levels. Running cold water for 30 seconds to 2 minutes before use can also help flush lead from pipes. Many utilities are replacing lead service lines, though this process takes years.
How to Remove Lead From Water
These filtration methods are effective for reducing Lead in drinking water:
| Filter Method | Effectiveness | Cost Range | Certification |
|---|---|---|---|
| Reverse Osmosis (RO) | 95-99% removal | $200-500 (under-sink) | NSF/ANSI 58 |
| Carbon Block Filter | 95-99% removal | $30-80 (pitcher/faucet) | NSF/ANSI 53 (lead) |
| KDF Media Filter | 90-98% removal | $300-800 (whole-house) | NSF/ANSI 42 |
| Distillation | 99%+ removal | $100-400 (countertop) | NSF/ANSI 62 |
Reverse Osmosis (RO) — details
Gold standard for lead removal. Removes virtually all dissolved lead.
Carbon Block Filter — details
Must be specifically certified to NSF 53 for lead. Not all carbon filters qualify.
KDF Media Filter — details
Uses copper-zinc alloy. Often combined with carbon in whole-house systems.
Distillation — details
Highly effective but slow (1 gallon per 4-6 hours). Energy intensive.