Lead in Drinking Water: How It Gets There and How to Remove It

Lead Doesn't Come From Your Utility

When people think about lead in drinking water, they think about Flint, Michigan — a city where a decision to switch water sources caused lead to leach from aging pipes into the tap water of nearly 100,000 residents. What most people don't realize is that the Flint crisis wasn't unusual in its mechanism. It was unusual only in its scale and visibility.

Lead enters drinking water the same way in Flint as it does in every other city: it leaches from pipes, solder, and fixtures. Your utility may deliver perfectly clean water to the edge of your property. What happens between the street and your glass depends on the age and condition of your home's plumbing — and in millions of American homes, that plumbing contains lead.

How Lead Gets Into Your Water

There are three main pathways for lead to enter your drinking water:

Lead service lines. The pipe that connects your home to the municipal water main is called a service line. An estimated 4 to 9 million lead service lines remain in use across the United States, serving homes in cities from Chicago to Newark to New Orleans. The EPA's goal is to replace all of them, and the 2021 Lead and Copper Rule Revisions require utilities to inventory their service lines and accelerate replacement. But full replacement will take years — and in the meantime, lead service lines continue to shed particles into the water that flows through them.

Lead solder and brass fixtures. Before 1986, it was legal to use lead solder in household plumbing and to manufacture faucets and fixtures with brass alloys containing up to 8% lead. Homes built before 1986 are at significantly higher risk. The 1986 Safe Drinking Water Act amendments banned lead solder and required "lead-free" fixtures — but "lead-free" under federal law still permits up to 0.25% lead in fixtures, which can still leach into water over time.

Corrosive water chemistry. Lead doesn't leach at the same rate from all pipes. Water that is more acidic, has lower mineral content, or has been treated with certain disinfectants is more corrosive and will pull more lead from pipes and fixtures. The Flint crisis was triggered by a failure to add corrosion inhibitors to the new water source — a decision that dramatically accelerated lead leaching from existing pipes.

There Is No Safe Level of Lead

This is not a precautionary statement. It is the scientific consensus of the CDC, the WHO, and the EPA.

The EPA has set the Maximum Contaminant Level Goal (MCLG) for lead at zero — meaning the agency's own science-based target is the complete absence of lead in drinking water. The CDC states that no safe blood lead concentration has been identified in children, and that even blood lead levels as low as 3.5 micrograms per deciliter are associated with reduced IQ and attention problems.

Lead is a neurotoxin. In children, exposure during critical developmental windows causes permanent cognitive damage, behavioral problems, and reduced academic achievement. In adults, chronic lead exposure is associated with high blood pressure, kidney damage, and cardiovascular disease.

The problem is that lead poisoning from drinking water is largely invisible. It accumulates slowly. Symptoms are non-specific. And the damage — particularly to a child's developing brain — may not be apparent for years.

The Lead and Copper Rule: What the Law Requires

The original Lead and Copper Rule (LCR), published in 1991, was the first federal regulation specifically targeting lead in drinking water. It established an action level of 15 parts per billion (ppb) — the point at which utilities must take corrective action. Crucially, this is not a health-based limit. It is a management threshold. The EPA's own MCLG for lead is zero.

The Lead and Copper Rule Revisions (LCRR), which took effect in December 2021, made several significant updates:

• Required all public water systems to complete a full inventory of service line materials by October 2024
• Established a new trigger level of 10 ppb to initiate mitigation efforts earlier
• Required testing in schools and child care facilities for the first time
• Strengthened public notification requirements when lead is detected

These are meaningful improvements. But they apply only to public water systems — not to private wells. And they do not eliminate lead from water; they require utilities to manage it.

How to Test for Lead in Your Home

At-home test kits: Available at hardware stores for $15–$30. These kits detect lead in water but are less sensitive than laboratory analysis and may miss low-level contamination.

Certified laboratory testing: The most reliable method. You collect a first-draw sample (water that has been sitting in your pipes for at least 6 hours, typically overnight) and mail it to a state-certified lab. Results typically take 1–2 weeks and cost $20–$50 for a lead-only test, or are included in comprehensive water quality panels.

Important: Always use a first-draw sample for lead testing. This captures water that has been in contact with your pipes and fixtures for the longest time and gives the most accurate picture of your actual exposure.

If you want a comprehensive water quality check that includes lead along with other key contaminants, our partner Healthy Hydration offers professional testing with plain-English results and filtration recommendations.

What Filters Actually Remove Lead

Not all filters remove lead. Here's what works:

Reverse osmosis (RO) systems: The most effective option. A properly functioning RO system removes 95–99% of lead from drinking water. RO systems are installed under the sink and treat the water at a single tap. They also remove PFAS, arsenic, nitrates, and hundreds of other contaminants.

NSF/ANSI 53-certified filters: Filters certified to NSF/ANSI Standard 53 for lead removal have been independently verified to reduce lead to safe levels. Look specifically for the NSF/ANSI 53 certification and confirm that lead is listed as one of the contaminants the filter is certified to reduce. Not all carbon filters are certified for lead — you must check the specific certification.

*What does NOT remove lead:*

• Boiling water. Boiling kills bacteria but actually concentrates lead by evaporating water while leaving dissolved metals behind.
• Standard pitcher filters (like Brita) unless specifically certified for lead under NSF/ANSI 53. Many are certified only for taste and odor (NSF/ANSI 42), which does not include lead.
• Water softeners. These address hardness minerals, not heavy metals.

Practical Steps to Reduce Your Exposure Right Now

Flush your tap before drinking. If water has been sitting in your pipes for more than 6 hours — overnight, or while you were at work — let cold water run for 1–2 minutes before using it for drinking or cooking. This flushes out water that has been in contact with pipes and fixtures.

Always use cold water for drinking and cooking. Hot water leaches more lead from pipes and fixtures than cold water. Never use hot tap water for cooking, making coffee, or preparing infant formula.

If you have an infant, be especially careful. Infants who consume formula prepared with lead-contaminated water face the highest risk of harm. Use filtered water or bottled water for formula preparation until you have confirmed your tap water is lead-free.

Find out if you have a lead service line. Under the 2021 LCRR, your utility is required to maintain a service line inventory. Contact your water utility and ask whether your address is served by a lead service line. If it is, consider a point-of-use filter as an immediate protective measure while awaiting replacement.

Install a certified filter. A reverse osmosis system or NSF/ANSI 53-certified filter at your kitchen tap is the most reliable long-term protection, regardless of what's happening with service line replacement.

The Bottom Line

Lead in drinking water is a widespread, underappreciated problem. An estimated 4 to 9 million homes are still served by lead service lines. Millions more have lead solder or brass fixtures that can leach lead into water. There is no safe level of lead exposure — particularly for children.

The good news is that lead is one of the most effectively removed contaminants in water treatment. A reverse osmosis system or NSF/ANSI 53-certified filter will dramatically reduce your exposure. The first step is knowing whether lead is present in your water. Check your area's EPA water data with our free ZIP code report, or order a professional water quality test to know exactly what's coming out of your tap.

FranklyH2O provides water quality education based on publicly available EPA data and peer-reviewed research. This article is for informational purposes only and does not constitute medical advice.