Lead in Water: First-Draw vs Flushed Testing

There is no safe level of lead exposure, especially for children. It causes developmental delays, learning difficulties, and neurological damage. Unlike many contaminants that exist in the groundwater or municipal supply, lead typically enters water after it leaves the treatment plant, leaching from lead service lines or indoor plumbing materials.

The Risk: Pre-1986 Homes

In 1986, the Safe Drinking Water Act was amended to ban the use of pipes, solder, or flux that were not 'lead-free.' If your home was built before 1986, there is a high probability your plumbing contains lead solder. Even 'lead-free' brass fixtures installed before 2014 could legally contain up to 8% lead.

The Testing Protocol: First-Draw

Because lead leaches from pipes over time, water that sits stagnant absorbs the most lead. The EPA's Lead and Copper Rule mandates a 'first-draw' sample. This means the water must sit completely motionless in the pipes for at least 6 hours—usually overnight—before you collect the very first water that comes out of the tap in the morning.

Why We Use a Dual-Sample Approach

Vetted labs often recommend a dual-sample test: the first-draw sample, followed by a 'flushed' sample taken after letting the water run for 2-3 minutes. Comparing the two tells a story:

• If the first-draw is high but the flushed is low: The lead is likely coming from the fixture itself or the piping immediately behind the wall.
• If both samples are high: The lead is likely coming from the service line connecting your home to the water main, or from extensive lead plumbing throughout the house.

If lead is detected, certified installers usually recommend point-of-use filtration (like an RO system) certified to NSF/ANSI 53 for lead reduction as an immediate fix while assessing pipe replacement.