Access to clean drinking water is a cornerstone of health, and lead contamination remains one of the more stubborn threats to it. Lead exposure has been linked to developmental delays, learning disabilities, and damage to the nervous system, and it still shows up in millions of American homes through infrastructure most people never think about.
Why Was Lead Used in Pipes in the First Place?
Lead has been used in plumbing for roughly 2,000 years. The Romans used it in their aqueducts because it was malleable, corrosion-resistant, and easy to shape. The word "plumbing" comes from the Latin "plumbum," meaning lead. Without a viable alternative, it stayed a standard plumbing material well into the 20th century.
A Slow Reckoning With the Health Risks
Concerns about lead toxicity date back to the 1920s, when researchers first established that lead exposure, especially in children, causes developmental delays, learning disabilities, and nervous system damage. Despite that knowledge, lead pipes continued to be installed until the 1980s. In 1986, Congress amended the Safe Drinking Water Act to ban new lead pipe installations.
The EPA estimates 6 to 10 million lead service lines are still in use across the United States today. Replacing them is expensive and slow. In October 2024, the EPA finalized the Lead and Copper Rule Improvements, which requires water systems to identify and replace lead service lines within 10 years. That timeline remains in effect.
How Lead Gets Into Drinking Water
Lead is one of the most common contaminants in tap water, and it poses real health risks even at low levels. Lead enters the water supply through several routes:
- Aging lead pipes corrode over time and leach lead into water as it passes through, and many cities still have them in place.
- Industrial processes release lead particles into the air, which eventually settle into water systems.
- Old lead paint flakes into soil and washes into water supplies during heavy rain.
- Lead-rich soil and rock formations can leach the metal directly into groundwater.
A CDC report on lead in drinking water notes that no safe blood lead threshold has been identified in children, and that developmental effects can persist into adolescence even from early exposure. A home filtration system is one practical way to reduce your household's exposure while infrastructure replacement continues.
How ZeroWater's 5-Stage Filtration Works
ZeroWater's 5-stage filtration system uses ion exchange technology to remove up to 99.6% of Total Dissolved Solids, reducing lead and other common contaminants along the way. The five stages:
Stage 1: Mesh Filter Screen — Reduces suspended solids, which can carry lead and other particulates.
Stage 2: Foam Distributor — Evenly distributes water into the next stages.
Stage 3: Granular Activated Carbon — Filters organic contaminants and helps prevent bacterial growth.
Stage 4: Ion-Exchange Resin — Absorbs inorganic compounds as water passes through.
Stage 5: Ultra-Fine Mesh Screen — A final pass before water reaches your glass.
Shop ZeroWater
ZeroWater's water filtration solutions are built to reduce lead and other common contaminants. Shop pitchers and dispensers, water testers, and replacement filters.
Browse the full water filtration lineup, and check our FAQ if you have questions about how the system works.
Sources:
"Safe Drinking Water Act" - United States Environmental Protection Agency - https://www.epa.gov/sdwa
"Lead Service Line Replacement Accelerators" - United States Environmental Protection Agency - https://www.epa.gov/water-infrastructure/lead-service-line-replacement-accelerators
"Basic Information about Lead in Drinking Water" - United States Environmental Protection Agency - https://www.epa.gov/ground-water-and-drinking-water/basic-information-about-lead-drinking-water
"Lead in Drinking Water and Human Blood Lead Levels in the United States" - Centers for Disease Control and Prevention - https://www.cdc.gov/mmwr/preview/mmwrhtml/su6104a1.htm
"Lead and Copper Rule Improvements" - United States Environmental Protection Agency - https://www.epa.gov/ground-water-and-drinking-water/lead-and-copper-rule-improvements
