Lead in Tap Water: The Complete Guide for Homeowners

No safe level exists. Where it comes from, how to test, and how to protect your family.

Sources

Lead in drinking water almost never comes from the water source itself. It enters the water after it leaves the treatment plant, leaching from materials between the water main and your faucet. The three most common sources are:

Lead service lines: An estimated 9.2 million lead service lines still connect homes to water mains across the United States. These are the pipes running underground between the city's water main and your home's internal plumbing. The EPA's revised Lead and Copper Rule (LCRI) requires water systems to identify and replace lead service lines, but the timeline extends to 2037. If your home was built before 1950 in an older city, there is a meaningful chance your service line contains lead.

Lead solder: Before 1986, lead-based solder was commonly used to join copper pipes. Homes built between 1950 and 1986 are in the highest risk category for lead solder. Even small amounts of lead solder at joints can leach into standing water, especially when water is acidic (low pH) or sits in pipes for several hours.

Brass fixtures and valves: Until 2014, "lead-free" brass was legally permitted to contain up to 8% lead. Faucets, valves, and fittings made before 2014 can leach detectable amounts of lead, particularly in the first few seconds of flow after water has sat in contact with the brass overnight. Current law defines lead-free as less than 0.25% by weighted average.

Health Risks

Understanding the health implications requires separating legal standards from health science. The EPA sets Maximum Contaminant Levels (MCLs) for regulated contaminants, but these legal limits do not always align with what health researchers consider safe. The EWG maintains health guidelines that are often 10-100x stricter than legal limits.

For most contaminants, the risk from typical municipal water exposure is modest but not zero. The greatest concern is cumulative, long-term exposure over years and decades rather than acute effects from a single glass of water.

Vulnerable populations (infants, pregnant women, elderly, immunocompromised) should take extra precautions. If you fall into these categories, filtering drinking and cooking water is a reasonable precaution even when city data looks acceptable. Take our quiz for a personalized recommendation.

Testing

For lead, testing at your tap is essential because lead contamination is building-specific. Your city's water report reflects samples taken at the treatment plant and select distribution points, not inside your home. Two houses on the same block can have completely different lead levels depending on their plumbing materials and age.

The proper way to test for lead is a "first draw" sample: collect water that has been sitting in your pipes for at least 6 hours (typically first thing in the morning) without running the tap first. This captures the worst-case scenario for lead leaching from your plumbing.

DIY test strips ($10-20): Quick screening for hardness, chlorine, pH, lead, iron, and other basics. Results in 2 minutes. Accuracy is within 15-25% of lab results, which is sufficient for making treatment decisions. We recommend the 17-in-1 test strips as a starting point.

Certified lab test ($100-300): Mail-in kits from EPA-certified labs test for 50-200+ specific contaminants with high precision. Essential for PFAS, arsenic, lead, and other health-critical parameters. Results in 7-14 days. SimpleLab Tap Score is our recommended lab test.

Start with a DIY strip to understand the basics, then invest in a lab test if the strips flag any concerns or if you have specific worries about PFAS, lead, or arsenic that strips cannot accurately measure.

Removal

Immediate steps while you assess your situation: Run the cold water tap for 30-60 seconds before using water for drinking or cooking, especially first thing in the morning or after water has sat in pipes for several hours. Lead concentrations are highest in standing water. Always use cold water for cooking and baby formula, as hot water dissolves more lead from pipes and fixtures.

Filtration: An NSF 53 certified filter is the most practical first-line defense against lead. The Clearly Filtered pitcher removes over 99% of lead and costs about $90. For a permanent solution, an under-sink RO system (NSF 58 certified) removes 95-99% of lead along with everything else. See our full lead filter guide for specific product recommendations.

Pipe replacement: The only permanent fix for lead service lines is replacement. Contact your water utility to find out if your service line is lead and whether they have a replacement program. Under the EPA's revised Lead and Copper Rule, utilities must inventory and begin replacing lead service lines. Some cities offer free or subsidized replacement. Partial replacement (replacing only the utility's side of the service line) can temporarily increase lead levels by disturbing the pipe's interior coating, so insist on full replacement when possible.

For households with children under 6 or pregnant women: Filter all drinking and cooking water immediately, even before test results come back. The risk of lead exposure during critical developmental windows is too significant to wait. If your home was built before 1986, filtering is a prudent precaution regardless of what city-level data shows. Take our quiz for a personalized filter recommendation.