Castleton's Lead Pipe Search: Reading a Service-Line Inventory

The water leaving Castleton's treatment plant is clean and tested every day. The problem, if there is one, hides closer to home, in the short pipe that carries water from the street main into each house. That pipe is called a service line, and in older neighborhoods it is sometimes made of lead. Castleton, like every water system in the country, now has to find out exactly where those lead lines are.

A lead pipe is not automatically dangerous. Water systems add a chemical treatment, called corrosion control, that coats the inside of old pipes with a thin protective layer so lead does not dissolve into the water. As long as that coating holds, very little lead reaches the tap. But a coating can fail, and no town wants to gamble on pipes it cannot even locate. That is why the law now focuses on finding and removing lead service lines rather than only treating the water inside them.

Federal rules are tightening, and they are still changing. The lead action level, the amount of lead that triggers required action, is 15 parts per billion, and it is set to drop to 10 in 2027. The same updated rule tells utilities to replace nearly all their lead service lines within about a decade. Across the United States, about 4 million lead service lines are still in the ground, according to an EPA estimate built in 2025 from inventories like the one Castleton is making, and they sit most often in older, lower-income neighborhoods. These numbers are part of a rule still being adjusted, so Castleton's plan may change with it.

Before any pipe can be replaced, it has to be found, and the records are a mess. Many of Castleton's service lines were installed long ago, and the paperwork is incomplete or lost. Utility crews can dig small test pits at the curb to see a pipe directly, but digging every line would take years. So Castleton has asked residents to help by checking the pipe where it enters their own basement.

The homeowner test is simple and takes only a minute. First, find the water pipe where it comes through the basement wall or floor, before the meter. Next, scratch the surface of the pipe gently with a coin or a key. Then hold a strong magnet against the scratched spot. If the scratched metal is shiny and silver-gray and the magnet does not stick, the pipe is probably lead. If instead the magnet sticks firmly, the pipe is most likely galvanized steel, not lead, which is an important exception to notice. And if the scratch reveals a copper color, like a penny, the pipe is copper and not a concern. Residents report what they find, and the utility records it in the inventory.

Every completed test makes the map a little more accurate. The inventory is not the cure, but it is the step that must come first. A town cannot replace what it has not found, and it cannot reassure the families who turn out to be fine until it knows which homes those are. Castleton's search is slow and unglamorous, yet it is the foundation of everything that follows.

1. What is a service line, and why is it the part of the system Castleton is worried about for lead?
2. According to the passage, what is the lead action level now, and what change is scheduled for 2027?
3. Explain why a lead pipe is not automatically dangerous under normal conditions.
4. A homeowner scratches the pipe and finds that a magnet sticks to it firmly. According to the passage's test, what is the pipe most likely made of, and why is this an important exception to notice?
5. List, in order, the steps of the homeowner pipe test the passage describes.
6. Why must Castleton identify which homes have lead service lines before it can replace them all?
7. Write a short informative paragraph explaining to a Castleton homeowner why the town is asking residents to help check their own pipes. Use at least two details from the passage.