Lead in Drinking Water

Lead in drinking water is a serious health concern with no safe level of exposure, particularly for children and pregnant women. Unlike most contaminants, lead typically does not come from the water supply itself. It enters your water from the pipes, solder, and fixtures in your home or the service line connecting your house to the water main.

The EPA's action level for lead is 15 parts per billion (ppb), but the agency and most health organizations agree that zero is the only truly safe target. Even at levels below 15 ppb, long-term exposure is associated with developmental harm in children and cardiovascular effects in adults. For the full breakdown of health research and regulatory context, see our Lead reference page.

How Lead Gets Into Your Water

The source is almost always your plumbing, not the water treatment plant. There are three main pathways.

Lead service lines: Homes built before 1986 may be connected to the water main by a lead pipe. The EPA estimates 9.2 million lead service lines are still in use across the US. The 2021 Lead and Copper Rule Revisions require utilities to inventory and eventually replace them, but full replacement will take decades in many cities.

Lead solder: Until 1986, lead solder was commonly used to join copper pipes. Even in homes with copper plumbing, lead can leach from the solder joints, especially when water sits in the pipes for several hours (overnight or during the workday).

Brass fixtures and fittings: Older faucets, valves, and connectors made with brass alloys can contain up to 8% lead. The 2014 federal standard reduced the allowable lead content to 0.25% for new fixtures, but older ones remain in millions of homes.

How to Test for Lead

You cannot see, taste, or smell lead in water. Testing is the only way to know your exposure level.

A first-draw test is the most informative method. This means collecting a sample first thing in the morning (or after 6+ hours of no water use) from your primary drinking water tap. This captures the water that has been sitting in contact with your pipes and fixtures the longest, giving you the worst-case reading.

Home test kits for lead are available for $15 to $30 and provide a basic yes/no result at the detection threshold. For a precise measurement in parts per billion, a certified lab test ($25 to $100) is more useful because it tells you how much lead is present, not just whether it is detectable.

Your city's water quality report may list lead levels, but these reflect samples taken across the distribution system, not at your specific tap. A home with a lead service line or old solder will have higher levels than the city average. Look up your city in our database for system-wide data, then test at your own tap for your actual exposure.

Immediate Steps to Reduce Exposure

While you decide on a long-term treatment solution, these actions reduce lead exposure right away.

Flush before drinking: Run cold water for 30 seconds to 2 minutes before using it for drinking or cooking, especially first thing in the morning. This clears the water that has been sitting in contact with lead-containing materials. The longer the water has been standing, the longer you should flush.

Use cold water for cooking and drinking: Hot water dissolves lead faster than cold water. Never use hot tap water for cooking, making baby formula, or drinking. Heat cold water on the stove or in a kettle instead.

Clean aerators regularly: Faucet aerators trap sediment and particulate lead. Remove and clean them every few months.

Treatment Options That Work

Under-sink reverse osmosis

RO systems remove 95% to 99% of lead. This is the most reliable option if your levels are significantly above 15 ppb or if you have young children in the home. An under-sink RO system treats water at the tap you use for drinking and cooking, which is where lead exposure matters most. Cost is typically $150 to $500 installed. See our Reverse Osmosis guide.

Under-sink carbon block filters (NSF 53 certified)

Certain carbon block filters are certified to NSF/ANSI Standard 53 for lead reduction. These are less expensive than RO ($50 to $200) and effective for moderate lead levels. The critical detail is the NSF 53 certification specifically for lead. Not all carbon filters qualify. See our Under-Sink Filter guide.

Pitcher filters (NSF 53 certified)

Some pitcher filters are NSF 53 certified for lead. These are the lowest-cost option ($25 to $50 for the pitcher, $30 to $60 per year for replacement filters) and work well for drinking water if your levels are moderately elevated. Verify the specific model is NSF 53 certified for lead reduction, not just chlorine taste and odor. See our Pitcher Filter guide.

What does NOT remove lead

Boiling does not remove lead and concentrates it. Water softeners do not remove lead. Basic carbon filters without NSF 53 certification for lead are not reliable. Whole-house filters are less appropriate for lead because the source is typically the last few feet of plumbing, and a whole-house system installed at the point of entry does not treat lead that enters downstream from old fixtures and solder inside the house.

The Long-Term Fix: Plumbing

Filtration is the right immediate response, but the permanent solution is eliminating the lead source. If you have a lead service line, contact your utility about replacement programs. Many cities now offer partial or full subsidies for lead service line replacement under the updated Lead and Copper Rule. If the lead is coming from internal solder or fixtures, replacing the affected plumbing and faucets removes the source entirely.

Not sure where to start? Our Water Treatment Quiz can help you identify the right filtration approach based on your specific situation.