Lead in drinking water

What it is

Lead is a toxic metal that can dissolve into your water as it sits in or passes through lead service lines, older solder, and some brass fixtures. Because the source is your plumbing, lead levels can vary tap to tap and home to home — and even hour to hour, depending on how long water has been sitting in the pipe. It is colorless and tasteless, so it cannot be detected without a test.

Health effects, stated plainly

Health authorities are unusually direct about lead: there is no known safe level of exposure, particularly for infants and young children, in whom lead is linked to effects on development and behavior. In adults it is associated with cardiovascular and kidney effects. This is stated as a matter of fact, not alarm — it is simply why the health goal for lead is set at zero and why reducing exposure where it exists is worthwhile. For details, the CDC is a good primary source. CDC on lead →

How to know if you have it

You cannot taste or see lead, and because it comes from your specific plumbing, your neighbor's result does not tell you yours. A certified laboratory test of your own tap is the only reliable way to know. Many utilities also publish lead service line inventories you can check, but a tap test reflects what actually reaches your glass.

What the current limit is

Lead is unusual: EPA does not set a Maximum Contaminant Level (MCL) for it at the tap, but a treatment-based action level. As of June 2026, that action level is 0.015 mg/L (15 parts per billion) under the current rule; if more than 10% of sampled taps exceed it, the utility must act. EPA's 2024 Lead and Copper Rule Improvements (finalized October 2024) lower the action level to 0.010 mg/L (10 ppb) on a compliance schedule that begins roughly three years after publication. The health goal (MCLG) is zero — consistent with there being no known safe level. EPA Lead and Copper Rule Improvements (verified June 2026) →

These rules are actively changing. Confirm the current action level and compliance dates at the EPA link before relying on them.

What reduces it

Lead is reduced by treatment types: reverse osmosis and certain certified carbon-block filters are the common point-of-use routes, installed where you drink and cook. Because lead exposure is through ingestion — not bathing — treating the kitchen tap is the correct, affordable approach rather than treating the whole house. Flushing a tap that has sat overnight also lowers what you draw, but it is not a substitute for filtration.

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