Lead in drinking water is almost never a source water problem. It doesn't come from the aquifer. In the vast majority of cases, lead enters drinking water after it leaves the treatment plant — from the pipes, solder, and fixtures inside your home or at your service connection.

Until 1986, lead solder was standard practice in residential plumbing, and lead service lines were widely used to connect homes to the municipal main. That means any home built before 1986 has a meaningful probability of having lead somewhere in its plumbing system. Homes built before 1978 have even higher risk. The older the home, the more cumulative opportunity for lead to leach into the water that sits in those pipes.

Lead leaches into water primarily through contact — the longer water sits in contact with lead-containing plumbing, the more lead it picks up. This is why the first draw from a tap that hasn't been used in several hours typically has higher lead levels than water that's been running for a few minutes.

Slightly acidic or corrosive water accelerates leaching significantly. Water chemistry — particularly pH, hardness, and alkalinity — affects how aggressive your water is toward the metal it contacts. This is part of why a simple water test that characterizes your water's basic chemistry is useful even before you test for lead specifically.

Lead is a neurotoxin with no established safe level of exposure, and children under six and pregnant women are the most vulnerable populations. In children, even low-level lead exposure has been linked to developmental delays, learning disabilities, reduced IQ, and behavioral problems. The damage is largely irreversible, which is why pediatric health guidelines treat any detectable lead exposure as a concern.

Adults are also affected by lead exposure, with links to elevated blood pressure, kidney damage, and reproductive effects. The risk is cumulative — lead accumulates in bone tissue over time and can be re-released into the bloodstream during periods of high physiological demand such as pregnancy or aging.

The EPA's action level for lead is 15 parts per billion — but it's worth understanding what that number means. It's the threshold at which a utility is required to take action, not a level at which the water is considered safe. Many health experts, including the American Academy of Pediatrics, recommend treating any detectable lead as a concern in households with young children.

Lead is included in all three of our testing packages — Baseline, Clarity, and Certainty. We recommend lead testing for any customer in a home built before 1986, regardless of their primary concern. It's one of the most common findings in older housing stock and one of the most actionable: once you know it's there, there are straightforward solutions.

The most effective point-of-use treatment for lead is a certified reverse osmosis system or a certified carbon block filter rated for lead reduction under NSF/ANSI 53. Not all filters remove lead — the certification for lead reduction is specific and must be verified for the product you're using.

For whole-home lead reduction, the long-term solution is pipe replacement — removing lead service lines and lead solder from the plumbing system. This is a more involved project but eliminates the source rather than treating the symptom. For renters or homeowners who aren't ready for that investment, a properly certified point-of-use system at the kitchen tap provides meaningful protection for drinking and cooking water.